HomeMy WebLinkAboutAppendix E-Avila Ranch Drainage ReportAPPENDIX E
Avila Ranch Drainage Report
Avila Ranch Development Project
Final EIR
This Page Intentionally Left Blank.
Prepared for
Avila Ranch, LLC
735 Tank Farm Road, Suite 240
San Luis Obispo, CA 93401
Prepared by
Cannon
1050 Southwood Drive
San Luis Obispo, CA 93401
12/17/2015
Draft Drainage Report
Avila Ranch
Tentative Tract Map
Drainage Report 1
Avila Ranch, Tentative Tract Map
Table of Contents
1. Introduction and Background ................................................................................ 2
1.1. Introduction .......................................................................................................... 2
1.2. Project Location and Site Description .................................................................. 2
1.3. Project Description ............................................................................................... 2
2. Stormwater Regulations and Design Criteria ........................................................ 2
2.1. City of San Luis Obispo ....................................................................................... 2
2.1.1. Municipal Code ................................................................................................. 3
2.1.2. Waterway Management Plan (which includes the Drainage Design Manual) .... 3
2.2. Central Coast Regional Water Quality Control Board (RWQCB) .......................... 5
2.3. California Department of Fish and Wildlife (CDFW) ............................................. 6
2.4. Federal Emergency Management Agency (FEMA) .............................................. 6
2.5. US Army Corps of Engineers (USACE) ............................................................... 6
3. Existing Drainage Conditions ................................................................................. 7
3.1. Description of Existing Drainage Conditions ........................................................ 7
3.2. Hydrologic Analysis of Existing Conditions........................................................... 9
4. Proposed Drainage Conditions ............................................................................ 10
4.1. Description of Proposed Drainage Conditions .................................................... 10
4.2. Hydrologic Analysis of Proposed Conditions – Phases 1-3 ................................ 12
4.3. Hydrologic Analysis of Proposed Conditions – All Phases ................................. 15
4.4. Hydrologic Analysis of Proposed Conditions – Collection and Conveyance ....... 17
4.5. Stormwater Treatment and Retention ................................................................ 18
4.6. Floodplain Analysis ............................................................................................ 18
References
Figures
Figure 1 Vicinity Map
Figure 2 Existing Drainage Conditions
Figure 3 Drainage Map Existing Conditions
Figure 4 Drainage Map Proposed Phases 1-3
Figure 5 Drainage Map Proposed All Phases
Figure 6 Proposed Drainage Conditions
Appendices
Appendix A Site Data
Appendix B Hydrologic Analyses of Existing Conditions
Appendix C Hydrologic Analyses of Proposed Conditions
Appendix D Stormwater Treatment Calculations
Appendix E Floodplain Analysis
Appendix F Avocet Environmental Technical Memorandum
Drainage Report 2
Avila Ranch, Tentative Tract Map
1. Introduction and Background
1.1. Introduction
Avila Ranch, LLC is proposing a new mixed-use development in the City of San Luis
Obispo called Avila Ranch. A drainage study was conducted in September 2015 for the
Tentative Tract Map application for the proposed project. The intent of that study was to
establish the major drainage components that will be included with the proposed project,
and to determine their effects on the horizontal and vertical layout of lots, roads, grading,
and utilities at final buildout. This subsequent report includes that analysis and further
analyzes the needed phasing of the improvements, and the extent to which the project
must rely on offsite flood control improvements being implemented as part of the
Chevron Remediation project.
1.2. Project Location and Site Description
The proposed project is located in the City of San Luis Obispo in San Luis Obispo
County. The project site is located along the north side of Buckley Road, extending from
Vachell Lane to approximately 4,000 feet to the east, and approximately 2,000 feet to
the north. The site consists of approximately 150 acres of agricultural land. There are
no existing structures on the property except for a small, dilapidated corral located along
Buckley Road. The property is bisected by Tank Farm Creek, which is a seasonal creek
that is a tributary to the East Fork of San Luis Obispo Creek.
1.3. Project Description
The project consists of the construction of a new mixed-use development, including
single family residences, multi-family residences, commercial developments, and parks.
There are several public streets included with the proposed development.
2. Stormwater Regulations and Design Criteria
There are several governing bodies that have regulations and design criteria pertaining
to stormwater management for new development. This project is within the jurisdictions
of the following agencies:
City of San Luis Obispo
Central Coast Regional Water Quality Control Board (RWQCB)
California Department of Fish and Wildlife (CDFW)
Federal Emergency Management Agency (FEMA)
US Army Corps of Engineers (USACE)
2.1. City of San Luis Obispo
The City of San Luis Obispo has several regulations and standards that pertain to
stormwater management, including:
Drainage Report 3
Avila Ranch, Tentative Tract Map
Municipal Code
Waterway Management Plan (which includes the Drainage Design Manual)
Standard Specifications and Engineering Standards
2.1.1. Municipal Code
There following sections of the Municipal Code pertain to stormwater management.
Creek Setbacks (Municipal Code 17.16.025)
The City’s Creek Setback requirement applies to all creeks that are shown on Figure 9 of
the Conservation and Open Space Element in the General Plan. Tank Farm Creek is
shown on that figure as an “intermittent creek with degraded corridor but able to be
restored or repaired.” Per the code, a 20-foot setback is required for Tank Farm Creek
“from the existing top of bank (or the future top of bank resulting from a creek alteration
reflected in a plan approved by the city), or from the edge of the predominant pattern of
riparian vegetation, whichever is farther from the creek flow line”.
Floodplain Management Regulations (Municipal Code 17.84)
The City’s Floodplain Management Regulations apply to areas of special flood hazard as
identified by FEMA, which are areas that FEMA has identified as subject to inundation
by the 1% annual chance flood (100-year flood). The FEMA Flood Insurance Rate Map
Number 06079C1331G (Appendix A) shows a large portion of the site along the Tank
Farm Creek corridor within the Zone A (areas where no base flood elevation has been
determined) of the 1% annual chance floodplain boundary (100-year floodplain). Per the
code, the following pertain to the proposed project:
The proposed development is within a special floodplain management zone as
defined by the City of San Luis Obispo (see requirements from Waterway
Management Plan below), so the requirements in the Drainage Design Manual
for those zones must be met
Base flood elevations for the project site must be determined
A approved Letter of Map Revision (LOMR) is required prior to issuance of
building permits
All proposed nonresidential structures require certification from a registered civil
engineer or architect that they are floodproofed in accordance with Section
17.84.050(A)(3) of the Municipal Code
All proposed residential structures require post-construction certification from a
registered civil engineer or licensed land surveyor that their lowest floors are one
foot above the base flood elevation
Public utilities and facilities such as sewer, gas, electrical and water systems are
to be located and constructed to minimize flood damage
2.1.2. Waterway Management Plan (which includes the Drainage Design
Manual)
Drainage Report 4
Avila Ranch, Tentative Tract Map
The Waterway Management Plan (WMP) is a watershed-based management plan for
San Luis Obispo Creek and its tributaries. The Drainage Design Manual (DDM) is
Volume 3 of the WMP, and provides design guidance and criteria intended to meet
surface water management objectives. The following are some of the sections that
pertain to the proposed project:
Off-Site Facility Analysis, Design, and Mitigation (DDM 3.3)
Runoff shall be managed to prevent any significant increase in downstream peak flows,
including 2-year, 10-year, 50-year, and 100-year events. Significant generally means an
increase of over 5 percent at and immediately downstream of the project site.
Special Floodplain Management Zone Regulations (DDM 3.5.3)
The project site is located in Special Floodplain Management Zone #2, as identified by
Figure DDM 3-1 (Appendix A) in the DDM. These areas have been determined to have
a potentially significant effect on downstream flooding and bank stability, and therefore
development of these areas is restricted in the following ways:
The project shall not cause the 100-year flood elevation to increase more than
2.5 inches
The project shall not cause stream velocities to increase more than 0.3 ft/s
The project shall not cause a significant net decrease in floodplain storage
volume unless several exceptions are met.
Erosion Control and Stormwater Quality Requirements (DDM 3.7)
The proposed project is over 2.5 hectares in size, so a detailed erosion control plan is
required and shall be prepared in accordance with Section 10.0 of the DDM.
Channel Design Flow Requirements (DDM 5.2)
The Tank Farm Creek watershed includes approximately 1,200 acres (4.883 km2), per
the City of San Luis Obispo HEC-HMS model. Per Section 5.2 of the DDM, this
classifies the channel as a secondary waterway, and the new section of this creek shall
be designed for a minimum storm recurrence interval of 25 years with 1 foot of
freeboard.
Open Channel Design Criteria for Major and Secondary Waterways (DDM 5.3)
The new section of Tank Farm Creek shall be designed using a Constructed Natural
Channel design. This design typically includes a two-stage, or compound, channel with
a separate low-flow channel within the overall flood channel. The design shall include
provisions for emulating natural channel cross-section, as well as natural channel
planform shape and bedform or channel bottom features, such as pools and riffles.
Additional design criteria are contained within Section 5.3 of the DDM.
Analysis and Design of Bank Stabilization Structures (DDM 6.0)
The new section of Tank Farm Creek shall be designed in accordance with Section 6.0
of the DDM to provide for bank stability and to minimize impacts to aquatic and riparian
habitat.
Drainage Report 5
Avila Ranch, Tentative Tract Map
Channel and Conduit Capacity (DDM 7.2.1) and Hydraulic Gradient (7.2.10)
This section requires that conveyance systems shall be designed to convey the peak
runoff for the 10-year design storm with the hydraulic gradient a minimum of 6 inches
below the elevation of the inlet grates and manhole covers. In addition, an overland
conveyance shall be provided for the 100-year event such that the water surface
elevation is at least 1 foot below the finish floor of adjacent structures.
Inlets and Catch Basins (DDM 7.2.7)
Inlets shall be spaced so that gutter flow does not exceed a depth of 6 inches at the face
of the curb for a 10-year storm and so that a 100-year storm will not cause any damage
and can be contained within the right of way.
Outfalls/Open Channel & Pipe Systems (DDM 7.4.5)
Outfalls shall be above the mean low water (2-year flow) level unless the City approves
an exception.
Erosion Control and Stormwater Quality Requirements (DDM 3.7)
The proposed project is over 2.5 hectares in size, so a detailed erosion control plan is
required and shall be prepared in accordance with Section 10.0 of the DDM.
2.2. Central Coast Regional Water Quality Control Board (RWQCB)
The RWQCB is responsible for administering and enforcing the National Pollutant
Discharge Elimination System (NPDES) permit program, as authorized by the federal
Clean Water Act. This program regulates the quality of stormwater that is discharged to
surface water bodies. There are two separate permits that this project is required to
obtain coverage under, one that applies to stormwater discharges during construction,
and one that applies to stormwater discharges after construction is complete.
During Construction – Construction General Permit
Construction projects that disturb one or more acres of soil during construction are
required to obtain coverage under the Construction General Permit. This permit requires
the development and implementation of a Storm Water Pollution Prevention Plan
(SWPPP). The SWPPP must list Best Management Practices (BMPs) the discharger
will use to protect stormwater runoff and the placement of those BMPs. Additionally, the
SWPPP must contain a visual monitoring program and a chemical monitoring program
for "non-visible" pollutants to be implemented if there is a failure of BMPs. Section A of
the Construction General Permit describes the elements that must be contained in a
SWPPP.
Post-Construction – Phase II Municipal General Permit
The Phase II Municipal General Permit applies to stormwater discharges from small
Municipal Separate Storm Sewer Systems (MS4s). To comply with the requirements of
the Phase II Municipal General Permit, the RWQCB approved Post-Construction
Stormwater Management Requirements for Development Projects in the Central Coast
Region (Post-Construction Requirements) through adoption of Resolution R3-2013-
0032. The following post-construction requirements apply to the proposed project:
Drainage Report 6
Avila Ranch, Tentative Tract Map
Performance Requirement No. 1: Site Design and Runoff Reduction
This requirement is intended to limit the disturbance creeks and natural drainage
features, minimize compaction of highly permeable soils, limit clearing and
grading of native vegetation, minimize impervious surfaces, and minimizing
stormwater runoff by collecting it for reuse and by infiltrating it onsite.
Performance Requirement No. 2: Water Quality Treatment
This requirement is intended to provide treatment (physical, biological, or
chemical) of stormwater runoff from impervious areas to reduce pollutant loads.
Performance Requirement No. 3: Runoff Retention
The requirement is intended to promote groundwater recharge. The project site
is located in Watershed Management Zone 1, so the requirement is to prevent
offsite discharge from events up to the 95th percentile 24-hour rainfall event as
determined from local rainfall data.
Performance Requirement No. 4: Peak Management
This requirement states that the post-development peak flows discharged from
the site shall not exceed the pre-project peak flows for the 2-though 10-year
storm events.
2.3. California Department of Fish and Wildlife (CDFW)
A biological study was conducted to define the limits of jurisdiction for the California
Department of Fish and Wildlife (CDFW) which includes the Tank Farm Creek riparian
zone. Any work that is within CDFW jurisdiction will require permitting through CDFW.
2.4. Federal Emergency Management Agency (FEMA)
The Federal Emergency Management Agency (FEMA) has established flood insurance
zones throughout the City of San Luis Obispo. Development within these zones must be
in compliance with both the City and FEMA regulations.
The FEMA Flood Insurance Rate Map Number 06079C1331G (Appendix A) shows a
large portion of the project site along the Tank Farm Creek corridor within the Zone A of
the 1% annual chance floodplain boundary (100-year floodplain). Zone A includes areas
where no base flood elevation has been determined, and floodplains in these areas are
typically determined using approximate methodologies and not a detailed hydraulic
analysis.
The Conditional Letter of Map Revision (CLOMR) and Letter of Map Revision (LOMR)
processes will be required to modify flood insurance zones on the Avila Ranch property
and, if necessary, in the area affected by the Buckley Road extension.
2.5. US Army Corps of Engineers (USACE)
A biological study was conducted to define the limits of jurisdiction for the US Army
Corps of Engineers (USACE), which includes the creek bed below the ordinary high
water mark for Tank Farm Creek. Any work that is within USACE jurisdiction will require
permitting through USACE.
Drainage Report 7
Avila Ranch, Tentative Tract Map
3. Existing Drainage Conditions
3.1. Description of Existing Drainage Conditions
The existing project site consists of approximately 150 acres of agricultural land. The
site is bisected by Tank Farm Creek, which flows from north-east to south-west through
the site. The creek passes through an 84” culvert on the site where an existing dirt road
crosses the creek. Tank Farm Creek exits the site under a bridge at Buckley Road and
joins with the East Fork of San Luis Obispo Creek approximately 550 feet downstream of
the bridge. Figure 2 shows the existing drainage conditions for the site.
North of Tank Farm Creek, the site topography generally slopes toward the south.
There is an existing berm along the north side of the creek through most of the site. A
low ridge parallels the creek on the south side. The area north of the ridge generally
slopes toward the creek and toward an existing drainage in the north-east corner of the
site that connects to Tank Farm Creek. The area south of the ridge slopes toward a
drainage that runs north-east to south-west toward a culvert that crosses under Buckley
Road. The effectiveness of the culvert is questionable as it appears that a berm has
been constructed around the culvert outlet on the south side of Buckley Road. It
appears that runoff that reaches Buckley Road flows along the north side of the road to
Tank Farm Creek.
The Tank Farm Creek watershed extends north to the South Hills Open Space. It is
bordered on the east by the East Fork of San Luis Obispo Creek and Acacia Creek
watersheds, and on the west by the San Luis Creek watershed. The land use within the
Tank Farm Creek watershed is widely varied and includes undeveloped land, residential
development, commercial development, industrial development, agricultural land, and
land that was part of the historic tank farm in the area. The tank farm site contains
approximately 140 acres of depressions that are hydrologically isolated areas. These
areas were created as part of the historical oil storage operation and do not surface
drain. All of the precipitation that falls onto these areas either evapotranspirates or
infiltrates (Avocet 2009).
Tank Farm Creek passes through an existing headwall structure that is located
approximately 950 feet upstream of the Avila Ranch property on the tank farm site. The
headwall was originally constructed as part of the oil storage operation to provide
emergency containment for a catastrophic release of oil, and was constructed with two
36-inch-diameter gate valves. The channel downstream of the southern gate valve has
been filled in, leaving only one of the valves operational for discharging the flows in Tank
Farm Creek.
Approximately 630 acres of the Tank Farm Creek watershed is upstream of the headwall
(Avocet, 2009). The headwall and functioning gate valve effectively regulate the flow in
Tank Farm Creek downstream of the structure, and cause ponding upstream of the
structure in a series of three ponds. The existing headwall and ponds can contain
storms up to the 10-year event, but larger storms will overtop the headwall (Avocet,
2009).
Drainage Report 8
Avila Ranch, Tentative Tract Map
It appears that a large portion of the area south of Tank Farm Road and east of South
Higuera Street drains onto the Avila Ranch site. There is no public storm drain
infrastructure in this area except for an inlet on the south side of Tank Farm Road that
discharges into a drainage ditch that extends to the south and connects to Tank Farm
Creek just upstream of the project site. It appears that this ditch conveys runoff from
portions of Tank Farm Road and Suburban Road, as well as from the properties that are
adjacent to it. A few of the properties along the northern project property line have
detention or retention ponds, but their effectiveness is unknown.
The properties that border the west side of Avila Ranch also drain onto the site. This
includes two undeveloped properties and a large office building site. The office building
has stormwater detention ponds that discharge along its south property line. The runoff
from this site is planned to be routed through a stormwater detention pond on the Avila
Ranch site, so an attempt was made to account for the detention ponds for the
stormwater discharge from that site. For the purposes of this study, that site was
modeled as if it were an undeveloped site to attempt to account for the effects of the
onsite stormwater detention ponds. This approach, however, is probably still an
overestimate of the flows from that site for most storm events as the ponds on that site
were designed to limit the post-developed peak runoff for a 50-year storm event to the
pre-developed peak runoff for a 2-year storm event (Cannon 2005). Runoff from the
west side of Vachell Road has also been observed flowing across the road and onto the
project site near the intersection with Buckley Road.
Runoff enters the project site from the adjacent properties to the east. There is a
drainage ditch that enters at the north-east corner of the site and connects to Tank Farm
Creek. Runoff that enters the site south of the ridge line flows toward Buckley Road,
and then along the north side of Buckley Road to Tank Farm Creek.
The FEMA Flood Insurance Rate Map Number 06079C1331G (Appendix A) shows a
large portion of the project site along the Tank Farm Creek corridor within the Zone A
(areas where no base flood elevation has been determined) of the 1% annual chance
floodplain boundary (100-year floodplain). Figure DDM 3-2C (Appendix A) in the City of
San Luis Obispo’s Drainage Design Manual shows only the southwest portion of the site
within the 100-year floodplain, but the hydraulic model that was used to develop that
figure did not include Tank Farm Creek. Flooding has been observed in the southwest
corner of the site during significant storm events.
Figure WMP 3-2a in the City of San Luis Obispo’s Waterways Management Plan notes
that San Luis Obispo Creek could overflow south of Prado Road and enter the Tank
Farm Creek watershed during a 50-year storm event assuming certain upstream
conditions, but it is not clear if this is an actual scenario under current conditions. The
analyses in this study do not include any overflow from San Luis Obispo Creek into the
Tank Farm Creek watershed. It is recommended that additional information regarding
this be obtained from the City of San Luis Obispo.
Drainage Report 9
Avila Ranch, Tentative Tract Map
3.2. Hydrologic Analysis of Existing Conditions
Hydrologic analyses were performed as part of this study to estimate the magnitudes of
the runoff onto and off of the project site considering the existing condition of the
watershed and site. The US Army Corps of Engineers’ HEC-HMS model was used to
perform the hydrologic analyses and is based on the following methodology:
Watershed Model
o Loss Method: SCS Curve Number (CN)
o Hydrograph Transformation Method: SCS Unit Hydrograph lag time
o Baseflow Method: None
Flow Routing: None
Precipitation Model: SCS Type 1 24-hour design storm
o 2-year rainfall depth: 2.9 inches
o 10-year rainfall depth: 4.7 inches
o 25-year rainfall depth: 5.7 inches
o 50-year rainfall depth: 6.4 inches
o 100-year rainfall depth: 7.1 inches
Parameter Estimation
The portion of the watershed downstream of the tank farm remediation area was divided
into nine sub-basins for the existing conditions. The sub-basins were delineated using a
topographic map, and using the City of San Luis Obispo’s storm drain utility maps. The
sub-basins developed for the existing conditions for the watershed downstream of the
tank farm remediation area are shown in Figure 1.
Composite curve numbers (CN’s) were calculated for each sub-basin using the CN’s
published in Table 2-2a of TR-55 Urban Hydrology for Small Watersheds (NRCS 1986),
and by taking into account the hydrologic soil group and land cover. The hydrologic soil
groups were based on the NRCS Soil Survey for the area, and the land cover was based
on aerial photography for the area.
Times of concentration were calculated for each sub-basin using the methods presented
in the San Luis Obispo Drainage Design Manual and TR-55 Urban Hydrology for Small
Watersheds (NRCS 1986). Lag times were calculated as 60% of the times of
concentration (USACE 2000). The calculated parameters for each sub-basin are shown
in Table 1.
Drainage Report 10
Avila Ranch, Tentative Tract Map
Table 1 - Parameters for existing conditions sub-basins
Sub-basin Area (ac) CN Lag Time (min)
A1 31.55 89 14
A2 22.31 88 14
A3 27.34 88 8
A4 6.79 91 8
B 67.96 84 21
C 70.40 82 15
D 64.56 84 30
E 5.32 81 14
F 7.16 85 13
Peak Flows
Peak flows were estimated for Tank Farm Creek at the confluence with East Fork San
Luis Obispo Creek for the existing conditions by adding the hydrograph for the tank farm
remediation area in its existing condition (Avocet 2015) to the combined hydrograph for
the area downstream of the tank farm remediation area. The resulting hydrographs are
included in Appendix B and a summary of the peak flows is shown in Table 2 below.
Table 2 - Summary of peak flows from Avila Ranch for existing conditions
Storm Event Peak Flow (cfs)
Total
2-year 215
10-year 460
25-year 595
50-year 689
100-year 874
4. Proposed Drainage Conditions
4.1. Description of Proposed Drainage Conditions
A large-scale remediation is planned for the former tank farm site upstream of the Avila
Ranch site. This remediation effort includes the construction and enhancement of
several stormwater detention ponds that are expected to provide regional management
of peak flows in Tank Farm Creek. The report titled Hydrology Study Former San Luis
Obispo Tank Farm, 276 Tank Farm Road, San Luis Obispo, California prepared by
Avocet Environmental in 2009 gives a detailed analysis of the expected impacts of the
planned remediation.
As described in Section 3.1, the flow in Tank Farm Creek through the project site is
regulated by an existing headwall structure and associated ponds located just upstream
of the project site. The existing headwall and ponds can contain storms up to the 10-
year event, but larger storms are expected overtop the existing headwall (Avocet, 2009).
Drainage Report 11
Avila Ranch, Tentative Tract Map
The remediation effort includes excavating the existing storage area upstream of the
headwall to provide storage and regulated outflow for storms up to and including a 100-
year event. The excavation will connect three existing detention ponds into a single
pond. This pond will discharge onto the Avila Ranch site at the upstream end of the
proposed realignment of Tank Farm Creek, which will require a new outlet structure from
the pond and decommissioning the existing headwall structure.
It is assumed that the full remediation of the tank farm site will not be completed prior to
the construction of the Avila Ranch development, so the peak flow management for the
Avila Ranch development was analyzed in phases of development, including (1) Phase
1-3 with no remediation of the tank farm site, and (2) Phases 4-6 with partial remediation
of the tank farm site.
For the purposes of this analysis, Phases 1-3 of construction for the proposed
development are assumed to occur prior to any of the remediation at the Chevron tank
farm site being completed. The tank farm site would remain in its current condition and
the flows from that area would be unchanged. Development of Phases 1-3 would
include the buildout of the project north of Tank Farm Creek and the peak flows from the
developed area would be managed with an onsite detention basin. A portion of the
upper Tank Farm Creek on the project site will be realigned to connect to a detention
pond that is part of the tank farm site remediation. A new outlet structure from the pond
will be required and the existing headwall structure that regulates outflow from that area
will need to be decommissioned. In general, flow from adjacent properties will be
collected and conveyed through the site with underground pipe. Figure 6 shows a
conceptual layout of the re-aligned creek and conveyance pipe for offsite flow.
Phases 4-6 of construction for the proposed development are assumed to occur after a
portion of the remediation at the Chevron tank farm site was completed. These phases
of the development include the buildout of the project south of Tank Farm Creek. The
increase in peak flows from these phases of the Avila Ranch site would be mitigated by
the partial remediation of the tank farm site, which consists of storm drainage
improvements south of Tank Farm Road, along with an onsite detention basin. The
partial remediation includes the area bounded by Tank Farm Road to the north, the
Chevron property line to the west and south, and berms to the east (see Figure 2 from
the attached Technical Memorandum from Avocet for remediation area considered).
Drainage for the proposed development is described in the following sections.
Northwest Portion of Site (Phases 1-3)
Phases 1-3 of the project includes the portion of the site on the northwest side of Tank
Farm Creek, and consists mostly of medium-density single-family residences (approx.
4,000 sf lots) with some high-density multi-family residences. Runoff from these areas
will be directed to onsite vegetated treatment facilities to meet treatment and retention
requirements. For storms larger than the required onsite retention design storm, the
vegetated facilities will overflow into standpipes that connect to a network of stormdrain
conveyance pipes in the streets that discharge to Tank Farm Creek at various locations.
Drainage Report 12
Avila Ranch, Tentative Tract Map
Runoff from the public sidewalks and streets is proposed to be conveyed by surface flow
in the gutters and streets to vegetated treatment facilities located in the small onsite
parks and along the creek bank. These facilities will overflow into standpipes that
connect to the stormdrain pipe networks that discharge to the creek or a detention pond.
There is currently one detention pond planned for the site. This pond will be located at
the southwest corner of the site and detain the runoff from the single-family residences
and streets located in that portion of the site.
Offsite runoff that enters the site from the north and west is proposed to be collected and
conveyed through the project site with underground pipe.
Southeast Portion of Site (Phases 4-6)
Phases 4-6 of the project includes the portion of the site on the southeast side of Tank
Farm Creek, and includes low-density single-family residences (approx. 5,000 sf lots),
medium-density multi-family residences, commercial development, and parks. Runoff
from all of the imperious surfaces, including the public sidewalks and streets, is planned
to be directed to vegetated treatment facilities located at the backs of the sidewalks to
meet treatment and retention requirements. For storms larger than the required onsite
retention design storm, the vegetated facilities will overflow into standpipes that connect
to a network of stormdrain conveyance pipes in the streets that discharge to Tank Farm
Creek at various locations.
4.2. Hydrologic Analysis of Proposed Conditions – Phases 1-3
Phases 1-3 of construction for the proposed development includes the buildout of the
project north of Tank Farm Creek would occur prior to any of the remediation at the tank
farm site being completed. The tank farm site would remain in its current condition and
the flows from that area would be unchanged.
A detention basin is planned at the southwest corner of the site to manage peak flows
for the area, and is labeled as “Phase 1 Detention Basin” on Figure 4. This basin is
designed to detain the runoff from Sub-basin Phase 1A, and runoff from Sub-basins
Phase 1B, Phase 2, and Phase 3 will discharge directly to Tank Farm Creek un-
detained.
Hydrologic analyses were performed as part of this study to estimate the magnitudes of
the runoff from Phase 1 of the project site considering the proposed condition. The US
Army Corps of Engineers’ HEC-HMS model was used to perform the hydrologic
analyses and is based on the methodology described in Section 3.2. A description of
the hydrologic analysis performed for this scenario is presented below.
Parameter Estimation
The portion of the watershed downstream of the tank farm remediation area was divided
into 14 sub-basins for the proposed conditions. The sub-basins were based on the sub-
Drainage Report 13
Avila Ranch, Tentative Tract Map
basins for the existing conditions, but Sub-basin C was further divided to account for the
proposed construction of the Avila Ranch project. The sub-basins developed for the
proposed conditions for the watershed downstream of the tank farm remediation area
are shown in Figure 4.
Composite curve numbers and lag times were calculated for each sub-basin using the
same methods as for the existing conditions. The calculated parameters for each sub-
basin are shown in Table 3.
Table 3 - Parameters for proposed conditions (no remediation) sub-basins
Sub-basin Area (ac) CN Lag Time (min)
Phase 1A 24.16 91 6
Phase 1B 2.08 98 3
Phase 2 4.34 94 6
Phase 3 17.45 93 6
A1 31.55 89 14
A2 22.31 88 14
A3 27.34 88 8
A4 6.79 91 8
B 66.91 84 21
C1 9.49 83 12
C2 13.81 82 16
D 64.56 84 30
E 5.32 81 14
F 7.16 85 13
Detention Basin
The Phase 1 detention basin was modeled assuming it was initially empty, and that the
tailwater at the outlet structure was constant and based on the peak flow in Tank Farm
Creek for the given storm event. This assumption requires that the basin outlet include a
flap gate to keep the creek from backwatering the basin. The basin volume used is
summarized in Table 4 and the assumed tailwater elevations used the analyses are
shown in Table 5 and are based on the HEC-RAS hydraulic model developed for the
analysis of Tank Farm Creek.
Table 4 – Phase 1 detention basin volume
Elevation (ft) Area (ac) Cumulative Volume
(cf) 97.00 0.8145 0
105.00 1.6740 433,592
Drainage Report 14
Avila Ranch, Tentative Tract Map
Table 5 - Assumed tailwater elevation at basin outlet (HEC-RAS model station 8+00)
Strom Event Flow (cfs) Tailwater Elevation
(ft) 2-year 202 98.4
10-year 421 100.7
25-year 539 101.3
50-year 621 101.9
100-year 794 102.8
The basin outlet structure was modeled with two orifices. The parameters for the outlet
structure are shown in Table 6.
Table 6 - Outlet structure parameters
Description Invert Elevation (ft) Diameter (in)
Orifice #1 97.00 10
Orifice #2 100.25 30
The basin was also modeled with an overflow spillway. The spillway crest elevation
used was 104.00’; the spillway length was 105.00’, and the weir coefficient was 3.20.
Peak Flows
Peak flows were estimated for Tank Farm Creek at the confluence with East Fork San
Luis Obispo Creek for the proposed conditions by adding the hydrograph for the tank
farm remediation area (Avocet 2015) to the combined hydrograph for the area
downstream of the tank farm remediation area. The resulting peak flows are
summarized in Table 7. Based on this analysis, the peak flows in Tank Farm Creek after
the construction of the area north of Tank Farm Creek (Phases 1-3) will be reduced from
the existing condition for the design storms.
Table 7 - Summary of peak flows for Tank Farm Creek for proposed conditions Phases 1-3 (no
remediation)
Storm Event
Peak Flow (cfs)
% Change
Max. Ponding Depth
in Phase 1 Det.
Basin (ft) Existing Condition Proposed Condition
2-year 215 202 -6.0% 99.2
10-year 460 421 -8.6% 101.5
25-year 595 539 -9.4% 101.7
50-year 689 621 -9.8% 102.3
100-year 874 796 -8.9% 103.2
Drainage Report 15
Avila Ranch, Tentative Tract Map
4.3. Hydrologic Analysis of Proposed Conditions – All Phases
The full buildout of the project includes a total of 6 phases. Phases 1-3 are described in
the previous section, and Phases 4-6 of construction for the proposed development
would occur after a portion of the remediation at the Chevron tank farm site was
completed. These phases of the development include the buildout of the project south
of Tank Farm Creek. The increase in peak flows from these phases of the Avila Ranch
site would be mitigated by the partial remediation of the tank farm site, along with an
onsite detention basin. The partial remediation includes the area bounded by Tank
Farm Road to the north, the Chevron property line to the west and south, and berms to
the east (see Figure 2 from the attached Technical Memorandum from Avocet for
remediation area considered).
Sub-basin Phase 6A, which is a future park, will function as a detention basin for this
area. There is no tributary area to this basin other than the basin itself, so it will only
detain rainfall that falls directly on it.
A description of the hydrologic analysis performed for this scenario is presented below.
Parameter Estimation
The portion of the watershed downstream of the tank farm remediation area was divided
into19 sub-basins for the proposed conditions. The sub-basins were based on the sub-
basins for the existing conditions, but Sub-basins B, C, and D were further divided to
account for the proposed construction of the entire onsite Avila Ranch project. The sub-
basins developed for the proposed conditions for the watershed downstream of the tank
farm remediation area are shown in Figure 5.
Composite curve numbers and lag times were calculated for each sub-basin using the
same methods as for the existing conditions. The calculated parameters for each sub-
basin are shown in Table 8.
Drainage Report 16
Avila Ranch, Tentative Tract Map
Table 8 - Parameters for proposed conditions (partial remediation) sub-basins
Sub-basin Area (ac) CN Lag Time (min)
Phase 1A 24.16 91 6
Phase 1B 2.08 98 3
Phase 2 4.34 94 6
Phase 3 17.45 93 6
Phase 4 11.90 95 6
Phase 5 23.23 93 6
Phase 6A 7.90 80 18
Phase 6B 7.65 79 24
A1 31.55 89 14
A2 22.31 88 14
A3 27.34 88 8
A4 6.79 91 8
B1 28.74 85 15
B2 10.79 82 15
C1 9.49 83 12
C2 13.81 82 16
D 41.25 83 30
E 5.32 81 14
F 7.16 85 13
Detention Basin
The same geometry and outlet structure that was used for the Phase 1 detention basin
for the “no remediation” analysis was used for this analysis. The basin was modeled
assuming it was initially empty, and that the tailwater at the outlet structure was constant
and based on the peak flow in Tank Farm Creek for the given storm event. This
assumption requires that the basin outlet include a flap gate to keep the creek from
backwatering the basin. The assumed tailwater elevations used in the analyses were
based on the HEC-RAS model for Tank Farm Creek are shown in Table 9.
Table 9 - Assumed tailwater elevation at basin outlet (HEC-RAS model station 8+00)
Strom Event Flow (cfs) Tailwater Elevation (ft)
2-year 219 98.5
10-year 449 100.8
25-year 581 101.7
50-year 674 102.1
100-year 766 102.6
Sub-basin Phase 6A, which is a future park, was modeled as a detention basin for this
analysis. It was assumed that the park had a storage depth of 12”. The basin volume
Drainage Report 17
Avila Ranch, Tentative Tract Map
used is summarized in Table 10. The assumed outlet structure is a 3” orifice with an
invert elevation of 118.00’.
Table 10 – Phase 6A detention basin volume
Elevation (ft) Area (ac) Cumulative Volume
(cf) 118.00 7.0214
0
119.00 7.2339
310,480
Peak Flows
Peak flows were estimated for Tank Farm Creek at the confluence with East Fork San
Luis Obispo Creek for the proposed conditions by adding the hydrograph for the
upstream portion of the watershed (tank farm remediation area) to the combined
hydrograph for the area downstream of the tank farm remediation area. The resulting
peak flows are summarized in Table 11. Based on this analysis, the peak flows in Tank
Farm Creek after the construction of the entire onsite Avila Ranch project will not
increase by more than 5% from the existing condition for the design storms.
Table 11 - Summary of peak flows for Tank Farm Creek for proposed conditions full buildout (partial
remediation)
Storm Event
Peak Flow (cfs)
% Change
Max. Ponding Depth
in Phase 1 Det.
Basin (ft) Existing Condition Proposed Condition
2-year 215 219 2.0% 99.3
10-year 460 449 -2.4% 101.5
25-year 595 581 -2.4% 101.9
50-year 689 674 -2.2% 102.4
100-year 874 766 -12.3% 103.1
4.4. Hydrologic Analysis of Proposed Conditions – Collection and Conveyance
An additional hydrologic analysis was performed as part of this study to estimate peak
flow for sizing onsite stormwater collection and conveyance facilities. The Rational
Method was used for this analysis and is based on the following equation in the City of
San Luis Obispo’s Drainage Design Manual (DDM):
𝑄=𝐶∗𝑖∗𝐶𝑎∗𝐴
where
Q = Peak rate of runoff in cubic feet per second (cfs)
C = Runoff coefficient (DDM Table 4-1)
Drainage Report 18
Avila Ranch, Tentative Tract Map
i = Average intensity of rainfall for the time of concentration for a selected design
storm in in/hr (DDM Table 4-6)
Ca = Antecedent moisture factor (DDM Table 4-2)
A = Drainage area in acres
Exhibits showing the onsite sub-basins and their associated peak flow calculations area
included in Appendix C.
4.5. Stormwater Treatment and Retention
Stormwater treatment and retention is proposed for runoff from the new impervious
areas associated with this project. Runoff from these areas will be directed to vegetated
facilities that are intended to retain and infiltrate the runoff from events up to the 95th
percentile 24-hour rainfall event. For larger events, these vegetated facilities will
overflow into standpipes that connect to stormdrain conveyance pipes that discharge to
Tank Farm Creek. The exhibits and calculations associated with stormwater treatment
are included in Appendix D.
4.6. Floodplain Analysis
The FEMA Flood Insurance Rate Map Number 06079C1331G (Appendix A) shows a
large portion of the project site along the Tank Farm Creek corridor within the Zone A
(areas where no base flood elevation has been determined) of the 1% annual chance
floodplain boundary (100-year floodplain). As part of this project the FEMA floodplain
will be re-delineated to account for the proposed tank farm remediation and onsite
improvements. The floodplain analyses performed to date are included in Appendix E.
References
Avocet Environmental, Inc. December 1, 2015. Technical Memorandum Additional
Hydrology Support, Avila Ranch Development, San Luis Obispo, California.
Project No. 1428.002. (Attached)
Cannon Associates. August 2005. Dioptics Medical Products Inc. On-site Drainage
Report.
Avocet Environmental, Inc. January 26, 2009. Hydrology Study Former San Luis Obispo
Tank Farm, 276 Tank Farm Road, San Luis Obispo, California. Project No.
1212.005
Drainage Report 19
Avila Ranch, Tentative Tract Map
City of San Luis Obispo Department of Public Works and County of San Luis Obispo
Flood Control District. February 2003. San Luis Obispo Creek Waterway
Management Plan Volume III Drainage Design Manual.
NRCS. June 1986. Urban Hydrology for Small Watersheds, Technical Release 55.
US Army Corps of Engineers. March 2000. Hydrologic Modeling System HEC-HMS
Technical Reference Manual.
Existing Tank Farm HeadwallExisting 84" CulvertTankFarmCreekE .F o rk S LOCreekAvila Ranch SiteExisting CulvertExisting Buckley Road Bridge´0 500 1,000 1,500 2,000250FeetFigure 2AVILA RANCHEXISTING DRAINAGE CONDITIONS9/14/2015
1050 Southwood DriveSan Luis Obispo, CA 93401P 805.544.7407 F 805.544.3863
1050 Southwood DriveSan Luis Obispo, CA 93401P 805.544.7407 F 805.544.3863
1050 Southwood DriveSan Luis Obispo, CA 93401P 805.544.7407 F 805.544.3863
Proposed Tank Farm HeadwallTankFarmCreekE .F o rk S LOCreekAvila Ranch SiteExisting Buckley Road BridgeRe-aligned Tank Farm CreekCollection Swale at Property Line (Dashed Line)Converyance Pipe for Offsite Flow(Red Lines, Typ)´0 500 1,000 1,500 2,000250FeetFigure 6AVILA RANCHPROPOSED DRAINAGE CONDITIONS9/14/2015
Drainage Report A1
Avila Ranch, Tentative Tract Map
Appendix A
Site Data
Hydrologic Soil Group—San Luis Obispo County, California, Coastal Part
(Avila Ranch and Surrounding Area)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
8/24/2015
Page 1 of 43901400390170039020003902300390260039029003903200390350039014003901700390200039023003902600390290039032003903500710600710900711200711500711800712100712400712700713000713300713600713900
710600 710900 711200 711500 711800 712100 712400 712700 713000 713300 713600 713900
35° 15' 12'' N 120° 41' 12'' W35° 15' 12'' N120° 38' 50'' W35° 13' 57'' N
120° 41' 12'' W35° 13' 57'' N
120° 38' 50'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 10N WGS84
0 500 1000 2000 3000
Feet
0 200 400 800 1200
Meters
Map Scale: 1:16,400 if printed on A landscape (11" x 8.5") sheet.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at 1:24,000.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more accurate
calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as of
the version date(s) listed below.
Soil Survey Area: San Luis Obispo County, California, Coastal
Part
Survey Area Data: Version 6, Sep 26, 2014
Soil map units are labeled (as space allows) for map scales 1:50,000
or larger.
Date(s) aerial images were photographed: May 8, 2010—May 21,
2010
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor shifting
of map unit boundaries may be evident.
Hydrologic Soil Group—San Luis Obispo County, California, Coastal Part
(Avila Ranch and Surrounding Area)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
8/24/2015
Page 2 of 4
Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — San Luis Obispo County, California, Coastal Part (CA664)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
120 Concepcion loam, 2 to 5
percent slopes
D 179.9 16.8%
127 Cropley clay, 0 to 2
percent slopes
C 253.5 23.7%
128 Cropley clay, 2 to 9
percent slopes
C 8.2 0.8%
129 Diablo clay, 5 to 9
percent slopes
C 30.3 2.8%
130 Diablo and Cibo clays, 9
to 15 percent slopes
D 2.1 0.2%
169 Marimel sandy clay
loam, occasionally
flooded
C 81.8 7.7%
170 Marimel silty clay loam,
drained
C 143.0 13.4%
197 Salinas silty clay loam, 0
to 2 percent slopes
C 113.9 10.7%
216 Tierra sandy loam, 2 to 9
percent slopes
D 12.9 1.2%
221 Xererts-Xerolls-Urban
land complex, 0 to 15
percent slopes
243.3 22.8%
Totals for Area of Interest 1,068.8 100.0%
Hydrologic Soil Group—San Luis Obispo County, California, Coastal Part Avila Ranch and Surrounding Area
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
8/24/2015
Page 3 of 4
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay layer
at or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—San Luis Obispo County, California, Coastal Part Avila Ranch and Surrounding Area
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
8/24/2015
Page 4 of 4
Drainage Report B1
Avila Ranch, Tentative Tract Map
Appendix B
Hydrologic Analyses of Existing Conditions
0
100
200
300
400
500
600
700
800
900
1000
0 12 24 36 48Flow (cfs) Time (hrs)
Tank Farm Creek Flow
Existing Conditions
100-year Runoff
50-year Runoff
25-year Runoff
10-year Runoff
2-year Runoff
Drainage Report C1
Avila Ranch, Tentative Tract Map
Appendix C
Hydrologic Analyses of Proposed Conditions
0
100
200
300
400
500
600
700
800
900
0 12 24 36 48Flow (cfs) Time (hrs)
Tank Farm Creek Flow
Proposed Conditions - Phases 1-3
100-year Runoff
50-year Runoff
25-year Runoff
10-year Runoff
2-year Runoff
0
100
200
300
400
500
600
700
800
900
0 12 24 36 48Flow (cfs) Time (hrs)
Tank Farm Creek Flow
Proposed Conditions - All Phases
100-year Runoff
50-year Runoff
25-year Runoff
10-year Runoff
2-year Runoff
Peak Flow Calculations for NW Portion of Site
Updated:9/10/2015
Parameters for Peak Flow Calculations
Recurrence Antecedent Moisture Rainfall
Interval (years)Factor1, C a Intensity2, i (in/hr)
2 1.00 2.1
10 1.00 3.6
25 1.10 4.0
50 1.20 4.6
100 1.25 5.0
Peak Flow Calculations for NW Area of Site
Runoff Time of Conc.Creek
Sub-basin Area (sf)
Area, A (ac)Coefficient3, C T c (min)2-yr 10-yr 25-yr 50-yr 100-yr Outlet
NW-SFR-1 65,638 1.51 0.50 5 1.57 2.70 3.33 4.16 4.71 1
NW-SFR-2 102,165 2.35 0.50 5 2.45 4.20 5.18 6.48 7.33 1
NW-SFR-3 57,000 1.31 0.50 5 1.37 2.34 2.89 3.62 4.09 1
NW-SFR-4 111,382 2.56 0.50 5 2.67 4.58 5.65 7.07 7.99 1
NW-SFR-5 140,289 3.22 0.50 5 3.36 5.77 7.11 8.90 10.06 1
NW-SFR-6 91,372 2.10 0.50 5 2.19 3.76 4.63 5.80 6.56 1
NW-SFR-7 81,834 1.88 0.50 5 1.96 3.37 4.15 5.19 5.87 2
NW-SFR-8 63,183 1.45 0.50 5 1.51 2.60 3.20 4.01 4.53 3
NW-SFR-9 112,356 2.58 0.50 5 2.69 4.62 5.70 7.13 8.06 2
NW-SFR-10 43,289 0.99 0.50 5 1.04 1.78 2.19 2.75 3.11 3
NW-SFR-11 14,507 0.33 0.50 5 0.35 0.60 0.74 0.92 1.04 3
NW-SFR-12 42,429 0.97 0.50 5 1.02 1.74 2.15 2.69 3.04 2
NW-SFR-13 92,493 2.12 0.50 5 2.22 3.80 4.69 5.87 6.64 4
NW-SFR-14 71,566 1.64 0.50 5 1.71 2.94 3.63 4.54 5.13 4
NW-SFR-15 75,688 1.74 0.50 5 1.81 3.11 3.84 4.80 5.43 4
NW-SFR-16 24,488 0.56 0.50 5 0.59 1.01 1.24 1.55 1.76 5
NW-SFR-17 72,816 1.67 0.50 5 1.74 2.99 3.69 4.62 5.22 5
NW-STREET-1 26,259 0.60 0.80 5 1.01 1.73 2.13 2.67 3.01 1
NW-STREET-2 26,561 0.61 0.80 5 1.02 1.75 2.15 2.70 3.05 1
NW-STREET-3 53,147 1.22 0.80 5 2.04 3.50 4.31 5.40 6.10 1
NW-STREET-4 132,495 3.04 0.80 5 5.08 8.72 10.75 13.45 15.21 1
NW-STREET-5 73,757 1.69 0.80 5 2.83 4.85 5.98 7.49 8.47 2
NW-STREET-6 24,999 0.57 0.80 5 0.96 1.64 2.03 2.54 2.87 3
NW-STREET-7 30,326 0.70 0.80 5 1.16 2.00 2.46 3.08 3.48 4
NW-STREET-8 65,934 1.51 0.80 5 2.53 4.34 5.35 6.69 7.57 4
NW-STREET-9 31,072 0.71 0.80 5 1.19 2.04 2.52 3.15 3.57 4
NW-STREET-10 23,869 0.55 0.80 5 0.91 1.57 1.94 2.42 2.74 5
NW-PARK-1 9,035 0.21 0.10 5 0.04 0.07 0.09 0.11 0.13 1
NW-PARK-2 18,992 0.44 0.10 5 0.09 0.16 0.19 0.24 0.27 1
NW-PARK-3 16,520 0.38 0.10 5 0.08 0.14 0.17 0.21 0.24 4
NW-PARK-4 11,344 0.26 0.10 5 0.05 0.09 0.12 0.14 0.16 4
NW-HDR-1 93,473 2.15 0.50 5 2.24 3.84 4.74 5.93 6.71 2
NW-HDR-2 111,408 2.56 0.50 5 2.67 4.58 5.65 7.07 7.99 2
NW-OPEN-1 280,111 6.43 0.15 5 2.01 3.46 4.26 5.33 6.03 1
NW-OPEN-2 190,952 4.38 0.15 5 1.37 2.36 2.90 3.63 4.11 3
NW-OPEN-3 170,860 3.92 0.15 5 1.23 2.11 2.60 3.25 3.68 5
NW-OPEN-4 90,396 2.08 0.15 5 0.65 1.12 1.38 1.72 1.95 11
Notes
1Antecedent Mositure Factors from Table 4-2 in City of SLO Drainage Design Manual
2Rainfall Intensities from Table 4-6 in City of SLO Drainage Design Manual, assumes Time of Concentration <=10 min.
3Runoff Coefficients from Table 4-1 in City of SLO Drainage Design Manual, assumes Hydrologic Soil Group of C
Peak Flow (cfs) (Q=C*i*C a *A )
Peak Flow Calculations for SE Portion of Site
Updated:9/10/2015
Parameters for Peak Flow Calculations
Recurrence Antecedent Moisture Rainfall
Interval (years)Factor1, C a Intensity2, i (in/hr)
2 1.00 2.1
10 1.00 3.6
25 1.10 4.0
50 1.20 4.6
100 1.25 5.0
Peak Flow Calculations for NW Area of Site
Runoff Time of Conc.Creek
Sub-basin Area (sf)
Area, A (ac)Coefficient3, C T c (min)2-yr 10-yr 25-yr 50-yr 100-yr Outlet
SE-SFR-1 90,396 2.08 0.50 5 2.17 3.72 4.58 5.74 6.49 7
SE-SFR-2 36,221 0.83 0.50 5 0.87 1.49 1.84 2.30 2.60 6
SE-SFR-3 56,972 1.31 0.50 5 1.36 2.34 2.89 3.61 4.09 8
SE-SFR-4 57,999 1.33 0.50 5 1.39 2.39 2.94 3.68 4.16 7
SE-SFR-5 57,999 1.33 0.50 5 1.39 2.39 2.94 3.68 4.16 8
SE-SFR-6 20,971 0.48 0.50 5 0.50 0.86 1.06 1.33 1.50 8
SE-SFR-7 62,914 1.44 0.50 5 1.51 2.59 3.19 3.99 4.51 9
SE-SFR-8 42,366 0.97 0.50 5 1.01 1.74 2.15 2.69 3.04 9
SE-SFR-9 68,592 1.57 0.50 5 1.64 2.82 3.48 4.35 4.92 9
SE-SFR-10 39,454 0.91 0.50 5 0.94 1.62 2.00 2.50 2.83 9
SE-STREET-1 49,661 1.14 0.85 5 2.02 3.47 4.28 5.36 6.06 7
SE-STREET-2 55,852 1.28 0.85 5 2.27 3.90 4.81 6.02 6.81 8
SE-STREET-3 72,574 1.67 0.85 5 2.95 5.07 6.26 7.83 8.85 6
SE-STREET-4 110,499 2.54 0.85 5 4.50 7.72 9.52 11.92 13.48 9
SE-STREET-5 125,370 2.88 0.85 5 5.10 8.76 10.81 13.52 15.29 10
SE-PARK-1 58,078 1.33 0.15 5 0.42 0.72 0.88 1.11 1.25 6
SE-PARK-2 344,320 7.90 0.15 5 2.47 4.25 5.24 6.55 7.41 10
SE-MDR-1 219,839 5.05 0.60 5 6.32 10.85 13.38 16.74 18.93 10
SE-COM-1 60,705 1.39 0.65 5 1.89 3.25 4.00 5.01 5.66 6
SE-COM-2 56,091 1.29 0.65 5 1.75 3.00 3.70 4.63 5.23 10
SE-OPEN-1 447,062 10.26 0.20 5 4.28 7.35 9.07 11.35 12.83 6
SE-OPEN-2 850,610 19.53 0.20 5 8.15 13.99 17.25 21.59 24.41 6
SE-OPEN-3 120,098 2.76 0.20 5 1.15 1.98 2.44 3.05 3.45 9
SE-OPEN-4 164,852 3.78 0.20 5 1.58 2.71 3.34 4.18 4.73 10
SE-OPEN-5 524,318 12.04 0.20 5 5.02 8.62 10.63 13.31 15.05 11
Notes
1Antecedent Mositure Factors from Table 4-2 in City of SLO Drainage Design Manual
2Rainfall Intensities from Table 4-6 in City of SLO Drainage Design Manual, assumes Time of Concentration <=10 min.
3Runoff Coefficients from Table 4-1 in City of SLO Drainage Design Manual, assumes Hydrologic Soil Group of D
Peak Flow (cfs) (Q=C*i*C a *A )
Drainage Report D1
Avila Ranch, Tentative Tract Map
Appendix D
Stormwater Treatment Calculations
Drainage Report E1
Avila Ranch, Tentative Tract Map
Appendix E
Floodplain Analyses
September 14, 2015 Project No. 1428.001
Mr. John Rogers
Civil Senior Associate Engineer
CANNON
105 Southwood Drive
San Luis Obispo, CA 93401
Hydrology Study and Floodplain Analysis
Avila Ranch Development
San Luis Obispo, California
Dear Mr. Rogers:
This report documents the hydrologic and hydraulic analyses conducted to assess the extents of
the 100-year floodplain and 100-year base flood elevations for existing conditions and proposed
post-development conditions at the Avila Ranch property in San Luis Obispo, California (the site).
This evaluation was conducted in part to support efforts in developing a final grading plan and
storm water infrastructure for the site. The analysis does not take into account actual pad
elevations and in such assumes that flood waters are constrained to the grading extents provided
by Cannon as of the writing of this report. This analysis shall be updated when final grading
elevations and storm water infrastructure for the development project are finalized in support of a
Conditional Letter of Map Revision (CLOMR) submittal.
INTRODUCTION AND BACKGROUND
The site is located in the City of San Luis Obispo, California and encompasses approximately 141
acres northeast of the intersection between Vachell Lane and Buckley Road (Figure 1). The site
currently supports agricultural uses and is bisected by Tank Farm Creek which runs from the
northeastern portion of the property to the southwestern corner. The site’s post-development
condition is planned for residential, open space, and public park development.
This report identifies the land use, drainage catchments, and hydraulic conditions of the site for
both existing conditions as well as proposed post-development conditions to determine peak storm
water flow rates through Tank Farm Creek for the 100-year storm event and to delineate the
100-year floodplain for each condition. For the purposes of this study, existing conditions at the
site assumes that storm water management improvements proposed by Chevron on the property
upstream of the site have been completed. Improvements proposed by Chevron include increasing
storm water detention on their property and metering the peak flow rate from their property through
Tank Farm Creek to approximately 90 cubic feet per second (cfs) for the 100-year storm. It is also
assumed that as part of the project Tank Farm Creek will be rerouted to extend from the
Hydrology Study and Floodplain Analysis
Avila Ranch Development Page 2
San Luis Obispo, California September 14, 2015
southeastern portion of the Chevron property, through the Avila Ranch development, and
reconnect with the existing Tank Farm Creek alignment (Figure 2).
The following sections describe the hydrologic and floodplain analyses performed for both the
existing and proposed post-development conditions at the site.
HYDROLOGIC ANALYSIS
The hydrologic analysis takes on the approach provided in Volume III of the Waterway
Management Plan (WMP) for the City and County of San Luis Obispo. The approach uses the
Rational Method as described in the WMP for determining peak storm water runoff flow rates
from the various catchments that makeup the subject watershed and using the peak flow rates in
developing a model of the channel system.
Catchments tributary to Tank Farm Creek were delineated through examination of topographic
and City storm water infrastructure mapping of the study area. The hydrology for each catchment
was calculated on a macro scale and did not take into consideration local storm water management
infrastructure such as privately owned detention basins, storm water detention vaults, and storm
water conveyance infrastructure. Peak storm water runoff for each catchment was estimated using
the Rational Method as outlined in Volume III of the Waterway Management Plan for the City and
County of San Luis Obispo.
Existing Conditions Hydrology
Delineated catchments for existing conditions are shown in Figure 2. Runoff coefficients, time of
concentration, and rainfall intensity were determined for each catchment using tables and
equations published in Section H (Hydrology) of the San Luis Obispo County Department of
Public Works and Transportation Standard Construction Drawings (SLO County DPW 2014).
Where land use conditions were not uniform over the entire catchment an area weighted average
runoff coefficient was calculated. A summary of area, average slope, time of concentration,
rainfall intensity, runoff coefficient, and peak storm water runoff during the 100-year storm event
for each catchment under the existing conditions is provided in Table 1. The peak flows for
catchments and discharges from neighboring properties were then assigned as inflows into the
HEC-RAS model, a table summarizing the inflows and cumulative peak flows at cross-sections
along Tank Farm Creek is provided in Table 3.
Proposed Post-Development Conditions Hydrology
Post-development catchment delineations for the site incorporates proposed storm water
management infrastructure (i.e. street drop inlets, storm drain piping, etc…) provided by Cannon
for management of both onsite storm water runoff and offsite storm water runon. Peak flow
discharges at various locations along the creek for onsite storm water runoff were provided by
Cannon and are summarized in Table 4. Delineated offsite catchments for the proposed post-
development conditions are shown in Figure 4. Catchment areas, times of concentration, and
runoff coefficients for the post-development conditions were calculated based on the
reconfiguration of catchments as a result of proposed storm water management infrastructure
Hydrology Study and Floodplain Analysis
Avila Ranch Development Page 3
San Luis Obispo, California September 14, 2015
improvements as well as the change in land use. A summary of peak storm water runoff for the
100-year storm event and the associated parameters used to calculate this peak using the Rational
Method is provided in Table 2. The peak flows for the onsite catchments, offsite catchments, and
discharges from neighboring properties were then assigned as inflows into the HEC -RAS model,
a table summarizing the inflows and cumulative peak flows at cross-sections along Tank Farm
Creek is provided in Table 4.
FLOODPLAIN ANALYSIS
The floodplain analysis was conducted by creating a model using the US Army Corp of Engineers
Hydrologic Engineering Center River Analysis System (HEC-RAS) to determine water surface
elevations within a creek and adjacent floodplain based on peak storm water runoff flow rates. A
HEC-RAS model for the East Fork San Luis Obispo Creek, was provided by the City of San Luis
Obispo and assumed a peak flow rate discharge from Tank Farm Creek at its confluence of 900 cfs.
As part of this study, a model for Tank Farm Creek was constructed that extends from the northern
property boundary of the site to the confluence of Tank Farm Creek and the East Fork San Luis
Obispo Creek. The newly constructed Tank Farm Creek model was then merged with the City
provided East Fork San Luis Obispo Creek model and the associated assumed peak flow rate
assigned in the City provided model was removed.
The following sections describe how the Tank Farm Creek model was created, what parameters
were used and the results of the model run. An output of the model parameters and cross sections
is included in Appendix A.
Model Geometry
The alignment of Tank Farm Creek and associated cross sections were generated in AutoCAD
Civil 3D 2015. Elevations for each cross section were determined using existing and proposed
maximum grading extents topography provided by Cannon. The alignment and cross sections for
Tank Farm Creek were exported from AutoCAD and imported into the existing City provided
HEC-RAS model for the East Fork San Luis Obispo Creek. Additional parameters such as left
and right bank stations and elevations and obstructions were defined for each cross section within
the model.
Levee definitions were used within the model for Tank Farm Creek where adjacent land elevations
were below the left or right bank station elevations. Without defining the left or right bank
elevation as a levee within the model the model engine will artificially extend water surface
elevations to adjacent areas even though the water surface elevation calculated by the model does
not exceed the channel bank elevations.
Manning’s Roughness Coefficient
Manning’s roughness coefficients (“n” values) were defined for the channel section and the
overbank section of each cross-sections. Manning’s “n” values were selected based on guidance
from tables presented in USGS Guide for Selecting Manning’s Roughness Coefficients for Natural
Hydrology Study and Floodplain Analysis
Avila Ranch Development Page 4
San Luis Obispo, California September 14, 2015
Channels and Flood Plains WSP 2339 (Arcement, 1989). Using this methodology an initial
Manning’s “n” value is selected based on the soil conditions (firm soil for this site), this initial
value is then increased based on adjustments for irregularity of the channel or floodplain, variation
in channel cross-section, degree of obstruction, and degree of vegetation. Based on field
observations, Tank Farm Creek in the study area is a highly vegetated channel with reeds, bushes,
and trees growing within the channel banks. A Manning’s “n” value of 0.071 was selected for this
portion of the channel. The overbank areas are primarily occupied by cultivated fields, with minor
irregularities and no major obstructions. A Manning’s “n” value of .041 was selected for the
overbank areas. In the northern portion of the project site a reduced Manning’s “n” value of 0.35
was used for the realigned channel section of Tank Farm Creek as this will be an engineered
channel, and the degree of obstruction and vegetation can be managed.
Hydraulic Structures
Several hydraulic structures were modeled along Tank Farm Creek within the study area. The first
of these structures is a 48” diameter corrugated metal culvert at Station 29+00 of Tank Farm Creek
in the HEC-RAS model. The next two structures are bridges over Tank Farm Creek at Buckley
Road (Station 6+60) and Vachell Lane (Station 2+75). The geometry of the bridges were
approximated within the model based on record drawings, aerial photography, survey data and
measurements taken in the field.
RESULTS AND CONCLUSION
In the existing conditions, 100-year base flood elevations exceed the defined bank elevations of
Tank Farm Creek in several locations along its length resulting in the 100-year floodplain
extending into the adjacent agricultural fields. The extents of the 100-year floodplain and water
surface elevations for existing conditions are shown in Figure 3.
Approximately 1,500 feet upstream of the confluence between Tank Farm Creek and the East Fork
San Luis Obispo Creek 100-year base flood elevations exceed the defined banks of Tank Farm
Creek. This appears to be the result of backwater conditions from peak flow through the East Fork
San Luis Obispo Creek as the floodplain in this area matches the existing City HEC -RAS model
results as shown in the City and County’s Waterway Management Plan. The 100-year base flood
elevation across Buckley Road bridge is modeled to be approximately 102.68 feet. The bridge
deck is estimated to be at approximately 98.5 feet from existing topography. This translates to a
submergence of approximately 4.2 feet in the existing conditions scenario during the 100-year
storm event at the Buckley Road bridge.
In the post-development conditions it was assumed that development of the site would constrain
flood elevations within the existing riparian corridor along Tank Farm Creek. In order to assess
the maximum flood elevations expected, and to set development pad elevations, the post-
development model utilizes obstructions defined along the Tank Farm Creek channel at the edge
of the defined development grading. The resulting effect on base flood elevations along Tank
Farm Creek calculated by the HEC-RAS model in comparison to existing base flood elevations
was minimal (less than 2.5 inches).
Hydrology Study and Floodplain Analysis
Avila Ranch Development Page 5
San Luis Obispo, California September 14, 2015
The post-development 100-year base flood elevation across Buckley Road bridge is modeled to be
approximately 102.80 feet which results in a submergence of approximately 4.3 feet, an increase
of less than 1.5 inches over existing conditions. The post-development 100-year floodplain
delineation and water surface elevations for the post-development condition is shown in Figure 5.
If you have any questions regarding this report or require additional information, please do not
hesitate to call the undersigned at (949) 296-0977 x108.
Respectfully submitted,
AVOCET ENVIRONMENTAL, INC.
Tim Hunt, P.E.
Project Manager
TH:gs
P:\1428 Cannon Avila Ranch\Floodplain Model\Avila Ranch Floodplain Model\Report\Avila Ranch Hydrology Report 091415.docx
Hydrology Study and Floodplain Analysis
Avila Ranch Development Page 6
San Luis Obispo, California September 14, 2015
REFERENCES
Arcement Jr., George , J., and Verne R. Schneider, 1989, "Guide for Selecting Manning’s
Roughness Coefficients for Natural Channels and Floodplains," United States Geological
Survey Water Supply Paper 2339.
San Luis Obispo County Department of Public Works & Transporation, 2014, “2014 Standard
Construction Drawings”, pp. H-1-H-4.
Tables
Table 1 Existing Conditons Catchment and Discharge InformationAvila Ranch DevelopmentSan Luis Obispo, CAArea Longest Flow Path Highest Elevation Lowest Elevation Tc Rainfall Intensity Runoff Peak 100-Year Flowacresftftft Minutes in/hr CoefficientcfsA1 32.30 2082125113 20.4 3.700.7590A2 22.07 2132130115 19.3 3.900.6254A3 30.37 1950128115 18.4 3.980.6680A4 8.49957123118 11.7 4.760.8032B 49.03 2344135111 17.9 4.030.3773B2 14.85 656124110 5.1 5.000.3727C 36.64 1410124102 10.3 4.960.3767D 36.40 188412497 13.3 4.540.3761D2 59.80 396913298 28.8 3.010.3767E 7.10 1014127925.9 5.000.3713Chevron82Lockheed2CatchmentNote: Tc caluclated based on formula provided in SLO County Departmnet of Public Works and Transportation Standard Details 2014. Tc was taken to be a minimum value of 10 min. for the purposes of evaluating rainfall intensity using the tables provided in this standard.
Table 2Post-Development Conditons Catchment and Discharge InformationAvila Ranch DevelopmentSan Luis Obispo, CAArea Longest Flow Path Highest Elevation Lowest Elevation Tc Rainfall Intensity Runoff 100-Year Peak FlowacresftftftMinutes in/hr CoefficientcfsA132.30208212511320.43.790.7592A222.07213213011519.33.900.6254A330.37195012811518.43.990.6680A417.69171112511115.34.270.5844B offsite portion 18.561190135116.59.15.000.3734D2 offiste portion 15.401095132123.511.14.850.3728E7.101014127925.95.000.3713Chevron82Lockheed2CatchmentNote: Tc calculated based on formula provided in SLO County Departmnet of Public Works and Transportation Standard Details 2014. Tc was taken to be a minimum value of 10 min. for the purposes of evaluating rainfall intensity using the tables provided in this standard.
Table 3
Existing Conditons Model Flows
Avila Ranch Development
San Luis Obispo, CA
Total Peak
Inflow Cumulative Flow
cfs cfs
47+01 82 82
37+97 163 245
30+50 27 272
23+97 233 505
8+00 130 635
3+98 13 648
Cross Section Station
Table 4
Post-Development Conditons Model Flows
Avila Ranch Development
San Luis Obispo, CA
Peak Onsite
Inflow
Peak Offsite
Inflow
Total Peak
Inflow Cumulative Flow
cfs cfs cfs cfs
47+01 17 116 133 133
39+99 51.6 0 52 185
36+98 13.4 146 159 344
33+99 32.2 0 32 376
32+00 47.9 0 48 424
23+97 40.1 123 164 587
20+97 16.6 0 17 604
18+00 16.7 0 17 621
8+00 130.1 43 173 793
Cross Section Station
Figures
SAN LUIS OBISPOCOUNTY AIRP ORT
TANK FARM ROAD
SOUTH HIGUERA STREETBUCKLEY ROADVACHELL LANEL
O
S O
S
O
S VA
LLE
Y R
O
A
D HWY 101S:\GIS\1425_Avila_Ranch\ArcDocuments\001_1428.001_Site_Location_Map.mxd\8/7/2015FIGURE 1
SITE LO CATION MAP
AVILA RANCHHYDROLOGY STUDY
PREPARED FORCANNONSAN LUIS OBISPO, CALIFORNIA
APPROXIMATESCALE
0 2,000 4,0001,000
Feet
EXPLANATION
CITY OF SAN LUIS OBISPO
PROJECT SITE
TANK FARM ROAD
SOUTH HIGUERA STREETBUCKLEY ROADVACHELL LANETANKFARMCRE E K
EAST F O R K SANLUISOB IS P O
C
REEKEASTFORKSANLUISOBISPOCREE K
CHEVRON PROPERTY
LOCKHEEDPROPERTY
D2
C B1
D1
A1
A3
A2
B2
E
A4
Source: Esri, DigitalGlobe, GeoEy e, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AEX, Getmapping, Aerogrid, IGN,IGP, swisstopo, and the GIS User CommunityS:\GIS\1428_Avila_Ranch\ArcDocuments\00_1428.001_ExisitingConditionsWatershed.mxd\9/14/2015FIGURE 2
EXISTING CONDITONSCATHCMENTS
AVILA RANCHHYDROLOGY STUDY
PREPARED FORCANNONSAN LUIS OBISPO, CALIFORNIA
APPROXIMATESCALE
0 500 1,000250
Feet
LEGEND
CREEKS
AVILA RANCH PROJECT BOUNDARY
EXISTING CATCHMENTS
TANK FARM ROAD
SOUTH HIGUERA STREETBUCKLEY ROADVACHELL LANESUBURBAN ROAD
HORIZON LANE39+99 114.4437+97 114.1136+98
113.9335+95
113.8735+00 113.6533+99 112.9433+00 110.34
30+50 111.99
29+22 111.8328+51 111.3125+00 109.93
23+97 108.7422+97 107.8522+00 106.97
19+00
105.0113+99 102.69
27+00 111.1832+00 111.97
20+01 105.65
17+00 103.5416+00 103.07
25+92 110.49
20+97 106.26
18+00 104.22
14+99 102.7711+99 102.6811+00 102.68
8+00 102.68
10+00 102.689+01 102.68
6+81 102.685+91 102.68
2+93 102.682+75 102.682+01 102.680+99 102.68
5+00 102.68
47+01 114.50
45+97 114.47
40+98 114.44
44+98 114.45
44+00 114.44
42+98 114.44
39+99 114.44
Source: Esri, DigitalGlobe, GeoEy e, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AEX, Getmapping,Aerogrid, IGN, IGP, swisstopo, and the GIS User CommunityS:\GIS\1428_Avila_Ranch\ArcDocuments\004_1428.001_Exisitng_Floodplain2.mxd\9/14/2015FIGURE 3
EXISTING CONDITIONS FLOODPLAIN
AVILA RANCHHYDROLOGY STUDY
PREPARED FORCANNONSAN LUIS OBISPO, CALIFORNIA
APPROXIMATESCALE
0 500 1,000250
Feet
PROJECT SITE
LEGEN D
HEC-RAS CROSS SECTIONS
CREEKS
EXISTING FEMA 100-YR FLOODPLAIN
EXISTING CON DITIONS 100-YR FLOOD PLAIN
AVILA RANCH PROJECT BOUNDARY
TO POGRAPHIC CONTOURS
TANKFARMCREEK
EASTBRANC H S ANL
U
I
S
OBI
SPOC
REEK
NOTE:CROSS SECTION 33+00 NOT USED FOR FLOODPLAIN
TIE INTO CITY OF SLO100-YEAR FLOODPLAIN TIE INTO CITY OF SLO100-YEAR FLOODPLAIN
TANK FARM ROAD
SOUTH HIGUERA STREETBUCKLEY ROADVACHELL LANETANKFARMCRE E K
EAST F O R K SANLUISOB IS P O
C
REEKEASTFORKSANLUISOBISPOCREE K
CHEVRON PROPERTY
LOCKHEEDPROPERTY
Source: Esri, DigitalGlobe, GeoEy e, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AEX, Getmapping, Aerogrid, IGN,IGP, swisstopo, and the GIS User CommunityS:\GIS\1428_Avila_Ranch\ArcDocuments\006_1428.001_PostDevOffsiteCatchments.mxd\9/14/2015FIGURE 4
POST-DEVELOPMENTOFFSITE CATCHMENTS
AVILA RANCHHYDROLOGY STUDY
PREPARED FORCANNONSAN LUIS OBISPO, CALIFORNIA
APPROXIMATESCALE
0 500 1,000250
Feet
LEGEND
CREEKS
AVILA RANCH PROJECT BOUNDARY
POST-DEVELOPMENTOFFSITE CATCHMENTS
D2OFFSITE
BOFFSITE
A1
A2
A3
A4
E
NO TE: POST-DEVELOPMENT PEAK FLOWS ANDDISCHARGE LOCATIONS FOR ONSITECATCHMENTS PROVIDED BY CANNON ANDARE SUMMARIZED IN TABLE 4.
TANK FARM ROAD
SOUTH HIGUERA STREETBUCKLEY ROADVACHELL LANESUBURBAN ROAD
HORIZON LANE44
+
0
0
1
1
4
.
8
4
41
+
9
8
1
1
4
.
8
3
40
+
9
8
1
1
4
.
8
3
6+81 102.80
11+99 102.8811+00 102.86
8+00 102.81
10+00 102.859+01 102.82
25+92 111.1027+00 111.8532+00 112.77
20+97 106.4720+01 106.11
18+00 104.5717+00 103.9316+00 103.52
5+91 102.79
5+00 102.792+93 102.79
2+75 102.792+01 102.790+99 102.79
TIE INTO CITY OF SLO100-YEAR FLOODPLAIN
TIE INTO CITY OF SLO100-YEAR FLOODPLAIN
30+50 112.55
33+00 113.00
33+99 113.33
35+00 113.73
29+22 112.3128+51 112.2736+98
114
.39
45+
9
7
1
1
4
.
8
7
47+0
1
1
1
4
.
9
2
39+99 114.8225+00 109.91
44
+
9
8
1
1
4
.
8
5
13+
9
9
1
0
2
.
9
5
22+00
1
0
7
.
4
5
19+00
105
.4014+99 103.2122+97
1
0
8
.
2
6
23+97 1
0
9
.
1
1 35+95
114
.20
42
+
9
8
1
1
4
.
8
3
12+
9
9
1
0
2
.
9
1 37+97 114.74Source: Esri, DigitalGlobe, GeoEye, i-cubed, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AEX,Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User CommunityS:\GIS\1428_Avila_Ranch\ArcDocuments\005_1428.001_PostDev_Floodplain.mxd\9/14/2015FIGURE 5
POST DEVELOPMENT CONDITIONS FLOODPLAIN
AVILA RANCHHYDROLOGY STUDY
PREPARED FORCANNONSAN LUIS OBISPO, CALIFORNIA
APPROXIMATESCALE
0 500 1,000250Feet
PROJECT SITE
LEGEND
CREEKS
HEC-RAS CROSS SECTIONS
EXISTING FEMA 100-YR FLOODPLAIN
POST-DEVELOPMENT CONDITIONS 100-YEAR FLOOD PLAIN
AVILA RANCH PROJECT BOUNDARY
TOPOGRAPHIC CONTOURS
TANKFARMCREEK
EASTBRANC H S ANL
U
I
S
OBISPOC
R
EEK
Appendix A
HEC-RAS Model Output
HEC-RAS Plan: Plan 06 Locations: User Defined Profile: PF 1
River Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl
(cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft)
Tank Farm Creek TankFarmCreek (2 4701 PF 1 82.00 113.00 114.50 114.10 114.53 0.001504 1.25 65.59 98.66 0.27
Tank Farm Creek TankFarmCreek (2 4597 PF 1 82.00 112.66 114.47 113.77 114.47 0.000265 0.67 184.69 535.95 0.12
Tank Farm Creek TankFarmCreek (2 4498 PF 1 82.00 112.33 114.45 113.44 114.46 0.000096 0.49 249.39 475.70 0.08
Tank Farm Creek TankFarmCreek (2 4400 PF 1 82.00 112.00 114.44 113.11 114.45 0.000074 0.49 212.27 445.22 0.07
Tank Farm Creek TankFarmCreek (2 4298 PF 1 82.00 111.66 114.44 112.77 114.44 0.000038 0.40 277.14 537.73 0.05
Tank Farm Creek TankFarmCreek (2 4198 PF 1 82.00 111.33 114.44 112.44 114.44 0.000016 0.29 424.19 583.69 0.03
Tank Farm Creek TankFarmCreek (2 4098 PF 1 82.00 111.00 114.44 112.11 114.44 0.000008 0.22 627.90 745.05 0.02
Tank Farm Creek TankFarmCreek (2 3999 PF 1 82.00 110.66 114.44 114.44 0.000007 0.22 527.45 529.33 0.02
Tank Farm Creek TankFarmCreek (2 3797 PF 1 245.00 109.49 114.11 112.72 114.37 0.014829 4.06 60.42 28.23 0.49
Tank Farm Creek TankFarmCreek (2 3698 PF 1 245.00 108.84 113.93 111.98 113.95 0.001392 1.30 227.12 282.90 0.15
Tank Farm Creek TankFarmCreek (2 3595 PF 1 245.00 108.03 113.87 111.21 113.88 0.000412 0.68 407.91 636.04 0.08
Tank Farm Creek TankFarmCreek (2 3500 PF 1 245.00 107.87 113.65 111.09 113.77 0.005659 2.73 89.69 36.63 0.31
Tank Farm Creek TankFarmCreek (2 3399 PF 1 245.00 107.63 112.94 110.87 113.10 0.007896 3.17 77.25 32.27 0.36
Tank Farm Creek TankFarmCreek (2 3300 PF 1 245.00 107.11 110.34 110.34 111.28 0.066239 7.80 31.39 16.64 1.00
Tank Farm Creek TankFarmCreek (2 3200 PF 1 245.00 107.07 111.97 110.44 112.17 0.008579 3.80 73.12 58.14 0.38
Tank Farm Creek TankFarmCreek (2 3050 PF 1 272.00 106.22 111.99 109.33 112.00 0.000290 0.76 394.71 290.41 0.07
Tank Farm Creek TankFarmCreek (2 2922 PF 1 272.00 105.98 111.83 108.98 111.91 0.002955 2.39 119.00 54.15 0.23
Tank Farm Creek TankFarmCreek (2 2900 Culvert
Tank Farm Creek TankFarmCreek (2 2851 PF 1 272.00 105.89 111.31 108.99 111.31 0.000032 0.25 1232.22 1064.07 0.02
Tank Farm Creek TankFarmCreek (2 2700 PF 1 272.00 105.66 111.14 108.54 111.26 0.006097 2.82 96.38 39.87 0.32
Tank Farm Creek TankFarmCreek (2 2592 PF 1 272.00 105.08 110.49 108.09 110.65 0.005253 3.13 86.80 26.71 0.31
Tank Farm Creek TankFarmCreek (2 2500 PF 1 272.00 104.59 109.93 107.63 110.12 0.006226 3.45 78.88 23.14 0.33
Tank Farm Creek TankFarmCreek (2 2397 PF 1 505.00 103.03 108.74 106.77 109.13 0.012262 4.99 101.20 28.75 0.47
Tank Farm Creek TankFarmCreek (2 2297 PF 1 505.00 102.07 107.85 105.50 108.11 0.008029 4.04 124.85 36.81 0.39
Tank Farm Creek TankFarmCreek (2 2200 PF 1 505.00 101.41 106.97 104.86 107.25 0.009741 4.26 118.47 37.53 0.42
Tank Farm Creek TankFarmCreek (2 2097 PF 1 505.00 100.77 106.26 103.86 106.47 0.005805 3.66 138.08 37.36 0.34
Tank Farm Creek TankFarmCreek (2 2001 PF 1 505.00 100.16 105.65 105.88 0.006381 3.81 132.54 36.24 0.35
Tank Farm Creek TankFarmCreek (2 1900 PF 1 505.00 99.58 105.01 105.23 0.006511 3.82 132.26 36.60 0.35
Tank Farm Creek TankFarmCreek (2 1800 PF 1 505.00 99.07 104.22 104.44 0.009709 3.76 134.25 52.66 0.42
Tank Farm Creek TankFarmCreek (2 1700 PF 1 505.00 98.48 103.54 103.71 0.005582 3.35 154.56 59.00 0.33
Tank Farm Creek TankFarmCreek (2 1600 PF 1 505.00 97.76 103.07 103.17 0.004772 2.49 202.89 88.79 0.29
Tank Farm Creek TankFarmCreek (2 1499 PF 1 505.00 96.82 102.77 102.84 0.002272 2.14 251.68 153.81 0.21
Tank Farm Creek TankFarmCreek (2 1399 PF 1 505.00 95.89 102.69 102.71 0.000663 1.48 401.32 260.04 0.12
Tank Farm Creek TankFarmCreek (2 1299 PF 1 505.00 95.52 102.69 102.69 0.000066 0.51 1266.56 778.66 0.04
Tank Farm Creek TankFarmCreek (2 1199 PF 1 505.00 95.24 102.68 102.69 0.000019 0.30 1838.93 760.42 0.02
Tank Farm Creek TankFarmCreek (2 1100 PF 1 505.00 94.97 102.68 102.68 0.000012 0.24 2050.29 695.18 0.02
Tank Farm Creek TankFarmCreek (2 1000 PF 1 505.00 94.36 102.68 102.68 0.000007 0.20 2344.68 656.01 0.01
Tank Farm Creek TankFarmCreek (2 901 PF 1 505.00 93.75 102.68 102.68 0.000007 0.21 2154.29 538.01 0.01
Tank Farm Creek TankFarmCreek (2 800 PF 1 635.00 93.20 102.68 102.68 0.000008 0.23 2267.54 475.56 0.01
Tank Farm Creek TankFarmCreek (2 681 PF 1 635.00 92.49 102.68 95.77 102.68 0.000005 0.19 2727.13 490.77 0.01
Tank Farm Creek TankFarmCreek (2 660 Bridge
Tank Farm Creek TankFarmCreek (2 591 PF 1 635.00 91.14 102.68 102.68 0.000001 0.10 4619.06 716.45 0.01
Tank Farm Creek TankFarmCreek (2 500 PF 1 635.00 91.50 102.68 102.68 0.000002 0.12 3856.86 518.49 0.01
Tank Farm Creek TankFarmCreek (2 398 PF 1 648.00 91.88 102.68 102.68 0.000001 0.11 4210.18 553.33 0.01
Tank Farm Creek TankFarmCreek (2 293 PF 1 648.00 91.56 102.68 94.31 102.68 0.000002 0.13 3316.62 409.27 0.01
Tank Farm Creek TankFarmCreek (2 275 Bridge
Tank Farm Creek TankFarmCreek (2 201 PF 1 648.00 90.44 102.68 102.68 0.000003 0.15 3051.87 393.06 0.01
Tank Farm Creek TankFarmCreek (2 99 PF 1 648.00 90.20 102.68 102.68 0.000004 0.18 2333.86 302.14 0.01
0200400600800100012001400113114115116117118ExistingConditonsTankFarmCreek - Station 47+01 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeIneffBank Sta.041.035.041020040060080010001200112113114115116117118Station (ft) ExistingConditonsTankFarmCreek - Station 45+97 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeIneffBank Sta.041.035.041
020040060080010001200112113114115116117118ExistingConditonsTankFarmCreek - Station 44+98 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeIneffBank Sta.041.035.04102004006008001000112113114115116117Station (ft) ExistingConditonsTankFarmCreek - Station 44+00 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeIneffBank Sta.041.035.041
02004006008001000111112113114115116117118119ExistingConditonsTankFarmCreek - Station 42+98 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeIneffBank Sta.041.035.04102004006008001000111112113114115116117118Station (ft) ExistingConditonsTankFarmCreek - Station 41+98 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeIneffBank Sta.041.035.041
020040060080010001200111112113114115116117118ExistingConditonsTankFarmCreek - Station 40+98 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeIneffBank Sta.041.035.04102004006008001000110111112113114115116117118Station (ft) ExistingConditonsTankFarmCreek - Station 39+99 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.035.041
0100200300400500600700800108110112114116118120ExistingConditonsTankFarmCreek - Station 37+97 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.0410200400600800108110112114116118120Station (ft) ExistingConditonsTankFarmCreek - Station 36+98 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
02004006008001000108110112114116118120ExistingConditonsTankFarmCreek - Station 35+95 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.0410500100015002000106108110112114116118120Station (ft)ExistingConditonsTankFarmCreek - Station 35+00 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
020040060080010001200140016001800106108110112114116118120ExistingConditonsTankFarmCreek - Station 33+99 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.0410500100015002000106108110112114116118120Station (ft) ExistingConditonsTankFarmCreek - Station 33+00 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
0500100015002000106108110112114116118ExistingConditonsTankFarmCreek - Station 32+00 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.0410500100015002000106108110112114116118120Station (ft) ExistingConditonsTankFarmCreek - Station 30+50 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
020040060080010001200140016001800104106108110112114116118120122ExistingConditonsTankFarmCreek - Station 29+22 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041020040060080010001200140016001800104106108110112114116118120122Station (ft) ExistingConditonsTankFarmCreek - Station 29+00 Culvert US Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
02004006008001000120014001600104106108110112114116118120ExistingConditonsTankFarmCreek - Station 29+00 Culvert DS Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.04102004006008001000120014001600104106108110112114116118120Station (ft) ExistingConditonsTankFarmCreek - Station 28+51 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
02004006008001000120014001600104106108110112114116118120ExistingConditonsTankFarmCreek - Station 27+00 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.0410200400600800100012001400104106108110112114116118120Station (ft) ExistingConditonsTankFarmCreek - Station 25+92 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
020040060080010001200104106108110112114116118120ExistingConditonsTankFarmCreek - Station 25+00 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.04102004006008001000102104106108110112114116Station (ft) ExistingConditonsTankFarmCreek - Station 23+97 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
02004006008001000102104106108110112114116ExistingConditonsTankFarmCreek - Station 22+97 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.04102004006008001000100102104106108110112114116Station (ft) ExistingConditonsTankFarmCreek - Station 22+00 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
02004006008001000100102104106108110112114116ExistingConditonsTankFarmCreek - Station 20+97 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041020040060080010001200100102104106108110112114Station (ft) ExistingConditonsTankFarmCreek - Station 20+01 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
0200400600800100098100102104106108110112ExistingConditonsTankFarmCreek - Station 19+00 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.0410200400600800100098100102104106108110112114Station (ft) ExistingConditonsTankFarmCreek - Station 18+00 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
0200400600800100098100102104106108110112ExistingConditonsTankFarmCreek - Station 17+00 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041020040060080010009698100102104106108110112114Station (ft) ExistingConditonsTankFarmCreek - Station 16+00 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
020040060080010009698100102104106108110ExistingConditonsTankFarmCreek - Station 14+99 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.04102004006008001000949698100102104106Station (ft) ExistingConditonsTankFarmCreek - Station 13+99 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
02004006008001000949698100102104106108110ExistingConditonsTankFarmCreek - Station 12+99 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.04102004006008001000949698100102104106108110Station (ft) ExistingConditonsTankFarmCreek - Station 11+99 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
0200400600800949698100102104106108110ExistingConditonsTankFarmCreek - Station 11+00 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.0410100200300400500600700800949698100102104106108110Station (ft) ExistingConditonsTankFarmCreek - Station 10+00 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
010020030040050060070092949698100102104106108110ExistingConditonsTankFarmCreek - Station 9+01 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.04101002003004005006009095100105110115Station (ft) ExistingConditonsTankFarmCreek - Station 8+00 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
010020030040050092949698100102104ExistingConditonsTankFarmCreek - Station 6+81 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.041010020030040050092949698100102104Station (ft) ExistingConditonsTankFarmCreek - Station 6+60 Bridge US Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.041
01002003004005006007008009092949698100102104ExistingConditonsTankFarmCreek - Station 6+60 Bridge DS Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.04101002003004005006007008009092949698100102104Station (ft) ExistingConditonsTankFarmCreek - Station 5+91 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
01002003004005006009092949698100102104ExistingConditonsTankFarmCreek - Station 5+00 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.04101002003004005006009092949698100102104Station (ft) ExistingConditonsTankFarmCreek - Station 3+98 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
01002003004005009092949698100102104ExistingConditonsTankFarmCreek - Station 2+93 Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.04101002003004005009092949698100102104Station (ft) ExistingConditonsTankFarmCreek - Station 2+75 Bridge US Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.041
01002003004009092949698100102104ExistingConditonsTankFarmCreek - Station 2+75 Bridge DS Plan: Plan 08 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.04101002003004009092949698100102104Station (ft) ExistingConditonsTankFarmCreek - Station 2+01 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
0501001502002503003509092949698100102104ExistingConditonsTankFarmCreek - Station 0+99 Plan: Plan 08 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 4701 Profile: PF 1
E.G. Elev (ft) 114.53 Element Left OB Channel Right OB
Vel Head (ft) 0.02 Wt. n-Val. 0.035
W.S. Elev (ft) 114.50 Reach Len. (ft) 59.22 104.68 138.39
Crit W.S. (ft) 114.10 Flow Area (sq ft) 65.59
E.G. Slope (ft/ft) 0.001504 Area (sq ft) 65.59
Q Total (cfs) 82.00 Flow (cfs) 82.00
Top Width (ft) 98.66 Top Width (ft) 98.66
Vel Total (ft/s) 1.25 Avg. Vel. (ft/s) 1.25
Max Chl Dpth (ft) 1.50 Hydr. Depth (ft) 0.66
Conv. Total (cfs) 2114.8 Conv. (cfs) 2114.8
Length Wtd. (ft) 99.60 Wetted Per. (ft) 99.09
Min Ch El (ft) 113.00 Shear (lb/sq ft) 0.06
Alpha 1.00 Stream Power (lb/ft s) 1210.65 711.13 0.00
Frctn Loss (ft) 0.05 Cum Volume (acre-ft) 26.61 20.00 60.41
C & E Loss (ft) 0.01 Cum SA (acres) 8.79 5.16 20.14
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 4597 Profile: PF 1
E.G. Elev (ft) 114.47 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.041 0.035
W.S. Elev (ft) 114.47 Reach Len. (ft) 98.34 99.16 100.22
Crit W.S. (ft) 113.77 Flow Area (sq ft) 89.47 95.23
E.G. Slope (ft/ft) 0.000265 Area (sq ft) 340.98 95.23
Q Total (cfs) 82.00 Flow (cfs) 18.34 63.66
Top Width (ft) 535.95 Top Width (ft) 436.41 99.54
Vel Total (ft/s) 0.44 Avg. Vel. (ft/s) 0.21 0.67
Max Chl Dpth (ft) 1.81 Hydr. Depth (ft) 0.21 0.96
Conv. Total (cfs) 5038.9 Conv. (cfs) 1127.1 3911.7
Length Wtd. (ft) 98.96 Wetted Per. (ft) 436.53 100.05
Min Ch El (ft) 112.66 Shear (lb/sq ft) 0.00 0.02
Alpha 1.81 Stream Power (lb/ft s) 1038.00 476.19 0.00
Frctn Loss (ft) 0.01 Cum Volume (acre-ft) 26.37 19.80 60.41
C & E Loss (ft) 0.00 Cum SA (acres) 8.49 4.92 20.14
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 4498 Profile: PF 1
E.G. Elev (ft) 114.46 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.035
W.S. Elev (ft) 114.45 Reach Len. (ft) 97.84 97.84 97.85
Crit W.S. (ft) 113.44 Flow Area (sq ft) 123.45 125.94
E.G. Slope (ft/ft) 0.000096 Area (sq ft) 248.34 125.94
Q Total (cfs) 82.00 Flow (cfs) 20.87 61.13
Top Width (ft) 475.70 Top Width (ft) 376.27 99.42
Vel Total (ft/s) 0.33 Avg. Vel. (ft/s) 0.17 0.49
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 4498 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 2.12 Hydr. Depth (ft) 0.33 1.27
Conv. Total (cfs) 8358.8 Conv. (cfs) 2127.9 6230.9
Length Wtd. (ft) 97.84 Wetted Per. (ft) 376.40 100.11
Min Ch El (ft) 112.33 Shear (lb/sq ft) 0.00 0.01
Alpha 1.69 Stream Power (lb/ft s) 1072.72 451.00 566.42
Frctn Loss (ft) 0.01 Cum Volume (acre-ft) 25.71 19.55 60.41
C & E Loss (ft) 0.00 Cum SA (acres) 7.58 4.69 20.14
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 4400 Profile: PF 1
E.G. Elev (ft) 114.45 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.035
W.S. Elev (ft) 114.44 Reach Len. (ft) 102.22 102.12 102.01
Crit W.S. (ft) 113.11 Flow Area (sq ft) 55.43 156.85
E.G. Slope (ft/ft) 0.000074 Area (sq ft) 220.62 156.85
Q Total (cfs) 82.00 Flow (cfs) 5.09 76.91
Top Width (ft) 445.22 Top Width (ft) 345.73 99.49
Vel Total (ft/s) 0.39 Avg. Vel. (ft/s) 0.09 0.49
Max Chl Dpth (ft) 2.44 Hydr. Depth (ft) 0.16 1.58
Conv. Total (cfs) 9553.7 Conv. (cfs) 592.7 8961.0
Length Wtd. (ft) 102.13 Wetted Per. (ft) 345.84 100.47
Min Ch El (ft) 112.00 Shear (lb/sq ft) 0.00 0.01
Alpha 1.51 Stream Power (lb/ft s) 882.07 389.54 529.92
Frctn Loss (ft) 0.01 Cum Volume (acre-ft) 25.18 19.23 60.41
C & E Loss (ft) 0.00 Cum SA (acres) 6.76 4.47 20.14
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 4298 Profile: PF 1
E.G. Elev (ft) 114.44 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.035 0.041
W.S. Elev (ft) 114.44 Reach Len. (ft) 99.86 99.96 100.07
Crit W.S. (ft) 112.77 Flow Area (sq ft) 67.83 189.57 19.73
E.G. Slope (ft/ft) 0.000038 Area (sq ft) 189.58 189.57 19.73
Q Total (cfs) 82.00 Flow (cfs) 5.50 75.25 1.25
Top Width (ft) 537.73 Top Width (ft) 308.47 99.90 129.36
Vel Total (ft/s) 0.30 Avg. Vel. (ft/s) 0.08 0.40 0.06
Max Chl Dpth (ft) 2.78 Hydr. Depth (ft) 0.22 1.90 0.15
Conv. Total (cfs) 13358.2 Conv. (cfs) 895.4 12258.6 204.2
Length Wtd. (ft) 99.95 Wetted Per. (ft) 308.58 100.85 129.36
Min Ch El (ft) 111.66 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.66 Stream Power (lb/ft s) 897.53 413.92 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 24.70 18.83 60.38
C & E Loss (ft) 0.00 Cum SA (acres) 6.00 4.24 19.99
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 4198 Profile: PF 1
E.G. Elev (ft) 114.44 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.035 0.041
W.S. Elev (ft) 114.44 Reach Len. (ft) 100.00 100.00 100.00
Crit W.S. (ft) 112.44 Flow Area (sq ft) 151.04 223.02 50.13
E.G. Slope (ft/ft) 0.000016 Area (sq ft) 181.49 223.02 50.13
Q Total (cfs) 82.00 Flow (cfs) 14.71 64.46 2.83
Top Width (ft) 583.69 Top Width (ft) 275.59 100.00 208.10
Vel Total (ft/s) 0.19 Avg. Vel. (ft/s) 0.10 0.29 0.06
Max Chl Dpth (ft) 3.11 Hydr. Depth (ft) 0.55 2.23 0.24
Conv. Total (cfs) 20410.2 Conv. (cfs) 3662.6 16044.2 703.4
Length Wtd. (ft) 100.00 Wetted Per. (ft) 275.97 101.10 208.11
Min Ch El (ft) 111.33 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.81 Stream Power (lb/ft s) 819.24 292.41 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 24.28 18.35 60.30
C & E Loss (ft) 0.00 Cum SA (acres) 5.33 4.01 19.60
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 4098 Profile: PF 1
E.G. Elev (ft) 114.44 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.035 0.041
W.S. Elev (ft) 114.44 Reach Len. (ft) 78.40 98.84 117.59
Crit W.S. (ft) 112.11 Flow Area (sq ft) 228.20 255.31 144.40
E.G. Slope (ft/ft) 0.000008 Area (sq ft) 257.82 255.31 144.40
Q Total (cfs) 82.00 Flow (cfs) 18.23 55.03 8.74
Top Width (ft) 745.05 Top Width (ft) 341.15 100.00 303.90
Vel Total (ft/s) 0.13 Avg. Vel. (ft/s) 0.08 0.22 0.06
Max Chl Dpth (ft) 3.44 Hydr. Depth (ft) 0.67 2.55 0.48
Conv. Total (cfs) 29908.5 Conv. (cfs) 6650.4 20071.6 3186.4
Length Wtd. (ft) 98.23 Wetted Per. (ft) 341.46 101.31 303.91
Min Ch El (ft) 111.00 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.93 Stream Power (lb/ft s) 1188.96 300.90 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 23.77 17.80 60.08
C & E Loss (ft) 0.00 Cum SA (acres) 4.62 3.78 19.01
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3999 Profile: PF 1
E.G. Elev (ft) 114.44 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.035 0.041
W.S. Elev (ft) 114.44 Reach Len. (ft) 199.91 201.68 215.46
Crit W.S. (ft) Flow Area (sq ft) 58.79 290.12 178.54
E.G. Slope (ft/ft) 0.000007 Area (sq ft) 58.79 290.12 178.54
Q Total (cfs) 82.00 Flow (cfs) 5.45 64.85 11.71
Top Width (ft) 529.33 Top Width (ft) 76.95 100.00 352.38
Vel Total (ft/s) 0.16 Avg. Vel. (ft/s) 0.09 0.22 0.07
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3999 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 3.78 Hydr. Depth (ft) 0.76 2.90 0.51
Conv. Total (cfs) 31456.3 Conv. (cfs) 2088.9 24876.3 4491.1
Length Wtd. (ft) 202.14 Wetted Per. (ft) 77.07 101.08 352.39
Min Ch El (ft) 110.66 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.68 Stream Power (lb/ft s) 886.21 0.00 0.00
Frctn Loss (ft) 0.02 Cum Volume (acre-ft) 23.49 17.19 59.64
C & E Loss (ft) 0.05 Cum SA (acres) 4.24 3.55 18.13
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3797 Profile: PF 1
E.G. Elev (ft) 114.37 Element Left OB Channel Right OB
Vel Head (ft) 0.26 Wt. n-Val. 0.041 0.071
W.S. Elev (ft) 114.11 Reach Len. (ft) 96.00 98.74 97.45
Crit W.S. (ft) 112.72 Flow Area (sq ft) 0.00 60.41
E.G. Slope (ft/ft) 0.014829 Area (sq ft) 0.00 60.41
Q Total (cfs) 245.00 Flow (cfs) 0.00 245.00
Top Width (ft) 28.23 Top Width (ft) 0.11 28.13
Vel Total (ft/s) 4.06 Avg. Vel. (ft/s) 0.39 4.06
Max Chl Dpth (ft) 4.62 Hydr. Depth (ft) 0.03 2.15
Conv. Total (cfs) 2011.9 Conv. (cfs) 0.0 2011.9
Length Wtd. (ft) 98.36 Wetted Per. (ft) 0.12 30.10
Min Ch El (ft) 109.49 Shear (lb/sq ft) 0.02 1.86
Alpha 1.00 Stream Power (lb/ft s) 702.81 0.00 128.46
Frctn Loss (ft) 0.32 Cum Volume (acre-ft) 23.35 16.37 59.20
C & E Loss (ft) 0.09 Cum SA (acres) 4.07 3.25 17.25
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3698 Profile: PF 1
E.G. Elev (ft) 113.95 Element Left OB Channel Right OB
Vel Head (ft) 0.02 Wt. n-Val. 0.071 0.041
W.S. Elev (ft) 113.93 Reach Len. (ft) 109.43 103.78 95.80
Crit W.S. (ft) 111.98 Flow Area (sq ft) 77.07 150.04
E.G. Slope (ft/ft) 0.001392 Area (sq ft) 77.07 150.04
Q Total (cfs) 245.00 Flow (cfs) 100.34 144.66
Top Width (ft) 282.90 Top Width (ft) 33.72 249.17
Vel Total (ft/s) 1.08 Avg. Vel. (ft/s) 1.30 0.96
Max Chl Dpth (ft) 5.09 Hydr. Depth (ft) 2.29 0.60
Conv. Total (cfs) 6566.3 Conv. (cfs) 2689.3 3877.0
Length Wtd. (ft) 98.50 Wetted Per. (ft) 35.80 249.24
Min Ch El (ft) 108.84 Shear (lb/sq ft) 0.19 0.05
Alpha 1.07 Stream Power (lb/ft s) 757.39 0.00 146.62
Frctn Loss (ft) 0.07 Cum Volume (acre-ft) 23.35 16.22 59.03
C & E Loss (ft) 0.00 Cum SA (acres) 4.07 3.18 16.98
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3595 Profile: PF 1
E.G. Elev (ft) 113.88 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 113.87 Reach Len. (ft) 95.68 94.63 94.00
Crit W.S. (ft) 111.21 Flow Area (sq ft) 0.02 95.51 312.38
E.G. Slope (ft/ft) 0.000412 Area (sq ft) 0.02 95.51 312.38
Q Total (cfs) 245.00 Flow (cfs) 0.00 65.36 179.64
Top Width (ft) 636.04 Top Width (ft) 0.69 44.26 591.10
Vel Total (ft/s) 0.60 Avg. Vel. (ft/s) 0.07 0.68 0.58
Max Chl Dpth (ft) 5.84 Hydr. Depth (ft) 0.03 2.16 0.53
Conv. Total (cfs) 12069.9 Conv. (cfs) 0.1 3219.8 8850.0
Length Wtd. (ft) 94.40 Wetted Per. (ft) 0.69 46.71 591.21
Min Ch El (ft) 108.03 Shear (lb/sq ft) 0.00 0.05 0.01
Alpha 1.02 Stream Power (lb/ft s) 872.08 0.00 182.66
Frctn Loss (ft) 0.10 Cum Volume (acre-ft) 23.35 16.01 58.53
C & E Loss (ft) 0.01 Cum SA (acres) 4.07 3.09 16.05
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3500 Profile: PF 1
E.G. Elev (ft) 113.77 Element Left OB Channel Right OB
Vel Head (ft) 0.12 Wt. n-Val. 0.071
W.S. Elev (ft) 113.65 Reach Len. (ft) 99.71 100.69 101.89
Crit W.S. (ft) 111.09 Flow Area (sq ft) 89.69
E.G. Slope (ft/ft) 0.005659 Area (sq ft) 89.69
Q Total (cfs) 245.00 Flow (cfs) 245.00
Top Width (ft) 36.63 Top Width (ft) 36.63
Vel Total (ft/s) 2.73 Avg. Vel. (ft/s) 2.73
Max Chl Dpth (ft) 5.78 Hydr. Depth (ft) 2.45
Conv. Total (cfs) 3256.7 Conv. (cfs) 3256.7
Length Wtd. (ft) 100.69 Wetted Per. (ft) 39.25
Min Ch El (ft) 107.87 Shear (lb/sq ft) 0.81
Alpha 1.00 Stream Power (lb/ft s) 1754.14 0.00 207.01
Frctn Loss (ft) 0.67 Cum Volume (acre-ft) 23.35 15.81 58.19
C & E Loss (ft) 0.00 Cum SA (acres) 4.06 3.00 15.41
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3399 Profile: PF 1
E.G. Elev (ft) 113.10 Element Left OB Channel Right OB
Vel Head (ft) 0.16 Wt. n-Val. 0.071
W.S. Elev (ft) 112.94 Reach Len. (ft) 100.06 99.37 98.97
Crit W.S. (ft) 110.87 Flow Area (sq ft) 77.25
E.G. Slope (ft/ft) 0.007896 Area (sq ft) 77.25
Q Total (cfs) 245.00 Flow (cfs) 245.00
Top Width (ft) 32.27 Top Width (ft) 32.27
Vel Total (ft/s) 3.17 Avg. Vel. (ft/s) 3.17
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3399 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 5.31 Hydr. Depth (ft) 2.39
Conv. Total (cfs) 2757.2 Conv. (cfs) 2757.2
Length Wtd. (ft) 99.37 Wetted Per. (ft) 34.68
Min Ch El (ft) 107.63 Shear (lb/sq ft) 1.10
Alpha 1.00 Stream Power (lb/ft s) 1728.69 0.00 269.12
Frctn Loss (ft) 1.73 Cum Volume (acre-ft) 23.35 15.62 58.19
C & E Loss (ft) 0.08 Cum SA (acres) 4.06 2.92 15.41
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3300 Profile: PF 1
E.G. Elev (ft) 111.28 Element Left OB Channel Right OB
Vel Head (ft) 0.95 Wt. n-Val. 0.071
W.S. Elev (ft) 110.34 Reach Len. (ft) 107.12 99.93 93.38
Crit W.S. (ft) 110.34 Flow Area (sq ft) 31.39
E.G. Slope (ft/ft) 0.066239 Area (sq ft) 31.39
Q Total (cfs) 245.00 Flow (cfs) 245.00
Top Width (ft) 16.64 Top Width (ft) 16.64
Vel Total (ft/s) 7.80 Avg. Vel. (ft/s) 7.80
Max Chl Dpth (ft) 3.23 Hydr. Depth (ft) 1.89
Conv. Total (cfs) 951.9 Conv. (cfs) 951.9
Length Wtd. (ft) Wetted Per. (ft) 18.00
Min Ch El (ft) 107.11 Shear (lb/sq ft) 7.21
Alpha 1.00 Stream Power (lb/ft s) 1785.06 0.00 396.26
Frctn Loss (ft) Cum Volume (acre-ft) 23.35 15.49 58.19
C & E Loss (ft) Cum SA (acres) 4.06 2.87 15.41
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3200 Profile: PF 1
E.G. Elev (ft) 112.17 Element Left OB Channel Right OB
Vel Head (ft) 0.20 Wt. n-Val. 0.041 0.071
W.S. Elev (ft) 111.97 Reach Len. (ft) 151.18 149.52 148.62
Crit W.S. (ft) 110.44 Flow Area (sq ft) 17.26 55.86
E.G. Slope (ft/ft) 0.008579 Area (sq ft) 17.26 55.86
Q Total (cfs) 245.00 Flow (cfs) 33.02 211.98
Top Width (ft) 58.14 Top Width (ft) 40.11 18.03
Vel Total (ft/s) 3.35 Avg. Vel. (ft/s) 1.91 3.80
Max Chl Dpth (ft) 4.90 Hydr. Depth (ft) 0.43 3.10
Conv. Total (cfs) 2645.1 Conv. (cfs) 356.5 2288.6
Length Wtd. (ft) 150.23 Wetted Per. (ft) 40.12 20.39
Min Ch El (ft) 107.07 Shear (lb/sq ft) 0.23 1.47
Alpha 1.15 Stream Power (lb/ft s) 1782.36 0.00 455.26
Frctn Loss (ft) 0.12 Cum Volume (acre-ft) 23.33 15.39 58.19
C & E Loss (ft) 0.06 Cum SA (acres) 4.02 2.83 15.41
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 3050 Profile: PF 1
E.G. Elev (ft) 112.00 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.041 0.071
W.S. Elev (ft) 111.99 Reach Len. (ft) 102.96 128.25 152.52
Crit W.S. (ft) 109.33 Flow Area (sq ft) 285.80 108.91
E.G. Slope (ft/ft) 0.000290 Area (sq ft) 285.80 108.91
Q Total (cfs) 272.00 Flow (cfs) 188.97 83.03
Top Width (ft) 290.41 Top Width (ft) 257.49 32.92
Vel Total (ft/s) 0.69 Avg. Vel. (ft/s) 0.66 0.76
Max Chl Dpth (ft) 5.77 Hydr. Depth (ft) 1.11 3.31
Conv. Total (cfs) 15981.5 Conv. (cfs) 11102.8 4878.7
Length Wtd. (ft) 118.64 Wetted Per. (ft) 257.52 34.78
Min Ch El (ft) 106.22 Shear (lb/sq ft) 0.02 0.06
Alpha 1.01 Stream Power (lb/ft s) 1915.52 0.00 540.87
Frctn Loss (ft) 0.08 Cum Volume (acre-ft) 22.80 15.11 58.19
C & E Loss (ft) 0.01 Cum SA (acres) 3.50 2.74 15.41
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2922 Profile: PF 1
E.G. Elev (ft) 111.91 Element Left OB Channel Right OB
Vel Head (ft) 0.09 Wt. n-Val. 0.041 0.071
W.S. Elev (ft) 111.83 Reach Len. (ft) 65.18 70.74 75.22
Crit W.S. (ft) 108.98 Flow Area (sq ft) 12.75 106.26
E.G. Slope (ft/ft) 0.002955 Area (sq ft) 12.75 106.26
Q Total (cfs) 272.00 Flow (cfs) 17.72 254.28
Top Width (ft) 54.15 Top Width (ft) 21.44 32.70
Vel Total (ft/s) 2.29 Avg. Vel. (ft/s) 1.39 2.39
Max Chl Dpth (ft) 5.85 Hydr. Depth (ft) 0.59 3.25
Conv. Total (cfs) 5004.0 Conv. (cfs) 326.1 4677.9
Length Wtd. (ft) 70.74 Wetted Per. (ft) 21.49 34.83
Min Ch El (ft) 105.98 Shear (lb/sq ft) 0.11 0.56
Alpha 1.05 Stream Power (lb/ft s) 1612.78 0.00 188.42
Frctn Loss (ft) Cum Volume (acre-ft) 22.45 14.79 58.19
C & E Loss (ft) Cum SA (acres) 3.17 2.64 15.41
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2851 Profile: PF 1
E.G. Elev (ft) 111.31 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 111.31 Reach Len. (ft) 151.83 151.59 151.54
Crit W.S. (ft) 108.99 Flow Area (sq ft) 23.16 82.36 1126.70
E.G. Slope (ft/ft) 0.000032 Area (sq ft) 23.16 82.36 1126.70
Q Total (cfs) 272.00 Flow (cfs) 3.80 20.69 247.51
Top Width (ft) 1064.07 Top Width (ft) 32.04 24.05 1007.98
Vel Total (ft/s) 0.22 Avg. Vel. (ft/s) 0.16 0.25 0.22
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2851 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 5.42 Hydr. Depth (ft) 0.72 3.42 1.12
Conv. Total (cfs) 48328.4 Conv. (cfs) 675.5 3676.5 43976.3
Length Wtd. (ft) 151.57 Wetted Per. (ft) 32.09 26.44 1008.11
Min Ch El (ft) 105.89 Shear (lb/sq ft) 0.00 0.01 0.00
Alpha 1.01 Stream Power (lb/ft s) 1568.63 0.00 167.96
Frctn Loss (ft) 0.02 Cum Volume (acre-ft) 22.45 14.67 58.19
C & E Loss (ft) 0.04 Cum SA (acres) 3.13 2.60 14.54
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2700 Profile: PF 1
E.G. Elev (ft) 111.26 Element Left OB Channel Right OB
Vel Head (ft) 0.12 Wt. n-Val. 0.071
W.S. Elev (ft) 111.14 Reach Len. (ft) 111.49 108.17 105.42
Crit W.S. (ft) 108.54 Flow Area (sq ft) 96.38
E.G. Slope (ft/ft) 0.006097 Area (sq ft) 96.38
Q Total (cfs) 272.00 Flow (cfs) 272.00
Top Width (ft) 39.87 Top Width (ft) 39.87
Vel Total (ft/s) 2.82 Avg. Vel. (ft/s) 2.82
Max Chl Dpth (ft) 5.48 Hydr. Depth (ft) 2.42
Conv. Total (cfs) 3483.4 Conv. (cfs) 3483.4
Length Wtd. (ft) 108.17 Wetted Per. (ft) 42.47
Min Ch El (ft) 105.66 Shear (lb/sq ft) 0.86
Alpha 1.00 Stream Power (lb/ft s) 1445.16 0.00 165.87
Frctn Loss (ft) 0.61 Cum Volume (acre-ft) 22.41 14.35 56.23
C & E Loss (ft) 0.00 Cum SA (acres) 3.07 2.49 12.79
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2592 Profile: PF 1
E.G. Elev (ft) 110.65 Element Left OB Channel Right OB
Vel Head (ft) 0.15 Wt. n-Val. 0.071
W.S. Elev (ft) 110.49 Reach Len. (ft) 87.93 91.99 96.49
Crit W.S. (ft) 108.09 Flow Area (sq ft) 86.80
E.G. Slope (ft/ft) 0.005253 Area (sq ft) 86.80
Q Total (cfs) 272.00 Flow (cfs) 272.00
Top Width (ft) 26.71 Top Width (ft) 26.71
Vel Total (ft/s) 3.13 Avg. Vel. (ft/s) 3.13
Max Chl Dpth (ft) 5.41 Hydr. Depth (ft) 3.25
Conv. Total (cfs) 3753.0 Conv. (cfs) 3753.0
Length Wtd. (ft) 91.99 Wetted Per. (ft) 29.24
Min Ch El (ft) 105.08 Shear (lb/sq ft) 0.97
Alpha 1.00 Stream Power (lb/ft s) 1334.77 0.00 188.04
Frctn Loss (ft) 0.53 Cum Volume (acre-ft) 22.41 14.13 56.23
C & E Loss (ft) 0.00 Cum SA (acres) 3.07 2.40 12.79
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2500 Profile: PF 1
E.G. Elev (ft) 110.12 Element Left OB Channel Right OB
Vel Head (ft) 0.18 Wt. n-Val. 0.071
W.S. Elev (ft) 109.93 Reach Len. (ft) 112.88 103.15 93.96
Crit W.S. (ft) 107.63 Flow Area (sq ft) 78.88
E.G. Slope (ft/ft) 0.006226 Area (sq ft) 78.88
Q Total (cfs) 272.00 Flow (cfs) 272.00
Top Width (ft) 23.14 Top Width (ft) 23.14
Vel Total (ft/s) 3.45 Avg. Vel. (ft/s) 3.45
Max Chl Dpth (ft) 5.34 Hydr. Depth (ft) 3.41
Conv. Total (cfs) 3447.3 Conv. (cfs) 3447.3
Length Wtd. (ft) 103.15 Wetted Per. (ft) 26.14
Min Ch El (ft) 104.59 Shear (lb/sq ft) 1.17
Alpha 1.00 Stream Power (lb/ft s) 1184.42 0.00 122.38
Frctn Loss (ft) 0.97 Cum Volume (acre-ft) 22.41 13.95 56.23
C & E Loss (ft) 0.02 Cum SA (acres) 3.07 2.35 12.79
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2397 Profile: PF 1
E.G. Elev (ft) 109.13 Element Left OB Channel Right OB
Vel Head (ft) 0.39 Wt. n-Val. 0.071
W.S. Elev (ft) 108.74 Reach Len. (ft) 107.26 99.62 92.59
Crit W.S. (ft) 106.77 Flow Area (sq ft) 101.20
E.G. Slope (ft/ft) 0.012262 Area (sq ft) 101.20
Q Total (cfs) 505.00 Flow (cfs) 505.00
Top Width (ft) 28.75 Top Width (ft) 28.75
Vel Total (ft/s) 4.99 Avg. Vel. (ft/s) 4.99
Max Chl Dpth (ft) 5.71 Hydr. Depth (ft) 3.52
Conv. Total (cfs) 4560.4 Conv. (cfs) 4560.4
Length Wtd. (ft) 99.62 Wetted Per. (ft) 32.03
Min Ch El (ft) 103.03 Shear (lb/sq ft) 2.42
Alpha 1.00 Stream Power (lb/ft s) 893.84 0.00 145.80
Frctn Loss (ft) 0.98 Cum Volume (acre-ft) 22.41 13.74 56.23
C & E Loss (ft) 0.04 Cum SA (acres) 3.07 2.29 12.79
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2297 Profile: PF 1
E.G. Elev (ft) 108.11 Element Left OB Channel Right OB
Vel Head (ft) 0.25 Wt. n-Val. 0.071
W.S. Elev (ft) 107.85 Reach Len. (ft) 111.53 96.82 81.90
Crit W.S. (ft) 105.50 Flow Area (sq ft) 124.85
E.G. Slope (ft/ft) 0.008029 Area (sq ft) 124.85
Q Total (cfs) 505.00 Flow (cfs) 505.00
Top Width (ft) 36.81 Top Width (ft) 36.81
Vel Total (ft/s) 4.04 Avg. Vel. (ft/s) 4.04
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2297 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 5.78 Hydr. Depth (ft) 3.39
Conv. Total (cfs) 5635.8 Conv. (cfs) 5635.8
Length Wtd. (ft) 96.82 Wetted Per. (ft) 39.42
Min Ch El (ft) 102.07 Shear (lb/sq ft) 1.59
Alpha 1.00 Stream Power (lb/ft s) 853.62 0.00 170.39
Frctn Loss (ft) 0.85 Cum Volume (acre-ft) 22.41 13.48 56.23
C & E Loss (ft) 0.00 Cum SA (acres) 3.07 2.22 12.79
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2200 Profile: PF 1
E.G. Elev (ft) 107.25 Element Left OB Channel Right OB
Vel Head (ft) 0.28 Wt. n-Val. 0.071
W.S. Elev (ft) 106.97 Reach Len. (ft) 101.79 102.61 104.00
Crit W.S. (ft) 104.86 Flow Area (sq ft) 118.47
E.G. Slope (ft/ft) 0.009741 Area (sq ft) 118.47
Q Total (cfs) 505.00 Flow (cfs) 505.00
Top Width (ft) 37.53 Top Width (ft) 37.53
Vel Total (ft/s) 4.26 Avg. Vel. (ft/s) 4.26
Max Chl Dpth (ft) 5.56 Hydr. Depth (ft) 3.16
Conv. Total (cfs) 5116.7 Conv. (cfs) 5116.7
Length Wtd. (ft) 102.61 Wetted Per. (ft) 39.96
Min Ch El (ft) 101.41 Shear (lb/sq ft) 1.80
Alpha 1.00 Stream Power (lb/ft s) 884.33 0.00 161.40
Frctn Loss (ft) 0.76 Cum Volume (acre-ft) 22.41 13.21 56.23
C & E Loss (ft) 0.02 Cum SA (acres) 3.07 2.13 12.79
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2097 Profile: PF 1
E.G. Elev (ft) 106.47 Element Left OB Channel Right OB
Vel Head (ft) 0.21 Wt. n-Val. 0.071
W.S. Elev (ft) 106.26 Reach Len. (ft) 95.92 96.95 97.50
Crit W.S. (ft) 103.86 Flow Area (sq ft) 138.08
E.G. Slope (ft/ft) 0.005805 Area (sq ft) 138.08
Q Total (cfs) 505.00 Flow (cfs) 505.00
Top Width (ft) 37.36 Top Width (ft) 37.36
Vel Total (ft/s) 3.66 Avg. Vel. (ft/s) 3.66
Max Chl Dpth (ft) 5.49 Hydr. Depth (ft) 3.70
Conv. Total (cfs) 6628.2 Conv. (cfs) 6628.2
Length Wtd. (ft) 96.95 Wetted Per. (ft) 39.75
Min Ch El (ft) 100.77 Shear (lb/sq ft) 1.26
Alpha 1.00 Stream Power (lb/ft s) 948.26 0.00 168.34
Frctn Loss (ft) 0.59 Cum Volume (acre-ft) 22.41 12.91 56.23
C & E Loss (ft) 0.00 Cum SA (acres) 3.07 2.04 12.79
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 2001 Profile: PF 1
E.G. Elev (ft) 105.88 Element Left OB Channel Right OB
Vel Head (ft) 0.23 Wt. n-Val. 0.071
W.S. Elev (ft) 105.65 Reach Len. (ft) 83.50 100.51 119.37
Crit W.S. (ft) Flow Area (sq ft) 132.54
E.G. Slope (ft/ft) 0.006381 Area (sq ft) 132.54
Q Total (cfs) 505.00 Flow (cfs) 505.00
Top Width (ft) 36.24 Top Width (ft) 36.24
Vel Total (ft/s) 3.81 Avg. Vel. (ft/s) 3.81
Max Chl Dpth (ft) 5.49 Hydr. Depth (ft) 3.66
Conv. Total (cfs) 6321.9 Conv. (cfs) 6321.9
Length Wtd. (ft) 100.51 Wetted Per. (ft) 38.52
Min Ch El (ft) 100.16 Shear (lb/sq ft) 1.37
Alpha 1.00 Stream Power (lb/ft s) 1033.45 0.00 0.00
Frctn Loss (ft) 0.65 Cum Volume (acre-ft) 22.41 12.61 56.23
C & E Loss (ft) 0.00 Cum SA (acres) 3.07 1.96 12.79
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1900 Profile: PF 1
E.G. Elev (ft) 105.23 Element Left OB Channel Right OB
Vel Head (ft) 0.23 Wt. n-Val. 0.071
W.S. Elev (ft) 105.01 Reach Len. (ft) 97.63 99.67 102.56
Crit W.S. (ft) Flow Area (sq ft) 132.26
E.G. Slope (ft/ft) 0.006511 Area (sq ft) 132.26
Q Total (cfs) 505.00 Flow (cfs) 505.00
Top Width (ft) 36.60 Top Width (ft) 36.60
Vel Total (ft/s) 3.82 Avg. Vel. (ft/s) 3.82
Max Chl Dpth (ft) 5.42 Hydr. Depth (ft) 3.61
Conv. Total (cfs) 6258.3 Conv. (cfs) 6258.3
Length Wtd. (ft) 99.67 Wetted Per. (ft) 38.91
Min Ch El (ft) 99.58 Shear (lb/sq ft) 1.38
Alpha 1.00 Stream Power (lb/ft s) 888.76 0.00 0.00
Frctn Loss (ft) 0.78 Cum Volume (acre-ft) 22.41 12.30 56.23
C & E Loss (ft) 0.00 Cum SA (acres) 3.07 1.88 12.79
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1800 Profile: PF 1
E.G. Elev (ft) 104.44 Element Left OB Channel Right OB
Vel Head (ft) 0.22 Wt. n-Val. 0.071
W.S. Elev (ft) 104.22 Reach Len. (ft) 112.21 100.09 84.81
Crit W.S. (ft) Flow Area (sq ft) 134.25
E.G. Slope (ft/ft) 0.009709 Area (sq ft) 134.25
Q Total (cfs) 505.00 Flow (cfs) 505.00
Top Width (ft) 52.66 Top Width (ft) 52.66
Vel Total (ft/s) 3.76 Avg. Vel. (ft/s) 3.76
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1800 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 5.15 Hydr. Depth (ft) 2.55
Conv. Total (cfs) 5125.2 Conv. (cfs) 5125.2
Length Wtd. (ft) 99.79 Wetted Per. (ft) 54.49
Min Ch El (ft) 99.07 Shear (lb/sq ft) 1.49
Alpha 1.00 Stream Power (lb/ft s) 870.54 0.00 0.00
Frctn Loss (ft) 0.72 Cum Volume (acre-ft) 22.41 12.00 56.23
C & E Loss (ft) 0.02 Cum SA (acres) 3.07 1.78 12.79
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1700 Profile: PF 1
E.G. Elev (ft) 103.71 Element Left OB Channel Right OB
Vel Head (ft) 0.17 Wt. n-Val. 0.071 0.041
W.S. Elev (ft) 103.54 Reach Len. (ft) 98.49 100.14 102.38
Crit W.S. (ft) Flow Area (sq ft) 144.94 9.62
E.G. Slope (ft/ft) 0.005582 Area (sq ft) 144.94 9.62
Q Total (cfs) 505.00 Flow (cfs) 485.03 19.97
Top Width (ft) 59.00 Top Width (ft) 44.74 14.26
Vel Total (ft/s) 3.27 Avg. Vel. (ft/s) 3.35 2.08
Max Chl Dpth (ft) 5.06 Hydr. Depth (ft) 3.24 0.67
Conv. Total (cfs) 6759.4 Conv. (cfs) 6492.1 267.3
Length Wtd. (ft) 100.18 Wetted Per. (ft) 46.29 14.33
Min Ch El (ft) 98.48 Shear (lb/sq ft) 1.09 0.23
Alpha 1.02 Stream Power (lb/ft s) 808.17 0.00 0.00
Frctn Loss (ft) 0.52 Cum Volume (acre-ft) 22.41 11.68 56.22
C & E Loss (ft) 0.02 Cum SA (acres) 3.07 1.66 12.78
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1600 Profile: PF 1
E.G. Elev (ft) 103.17 Element Left OB Channel Right OB
Vel Head (ft) 0.10 Wt. n-Val. 0.071
W.S. Elev (ft) 103.07 Reach Len. (ft) 92.18 101.35 111.39
Crit W.S. (ft) Flow Area (sq ft) 202.89
E.G. Slope (ft/ft) 0.004772 Area (sq ft) 202.89
Q Total (cfs) 505.00 Flow (cfs) 505.00
Top Width (ft) 88.79 Top Width (ft) 88.79
Vel Total (ft/s) 2.49 Avg. Vel. (ft/s) 2.49
Max Chl Dpth (ft) 5.31 Hydr. Depth (ft) 2.29
Conv. Total (cfs) 7310.4 Conv. (cfs) 7310.4
Length Wtd. (ft) 101.60 Wetted Per. (ft) 89.81
Min Ch El (ft) 97.76 Shear (lb/sq ft) 0.67
Alpha 1.00 Stream Power (lb/ft s) 847.50 0.00 0.00
Frctn Loss (ft) 0.32 Cum Volume (acre-ft) 22.41 11.28 56.21
C & E Loss (ft) 0.01 Cum SA (acres) 3.07 1.51 12.76
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1499 Profile: PF 1
E.G. Elev (ft) 102.84 Element Left OB Channel Right OB
Vel Head (ft) 0.07 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.77 Reach Len. (ft) 100.38 99.53 100.49
Crit W.S. (ft) Flow Area (sq ft) 3.18 223.55 24.94
E.G. Slope (ft/ft) 0.002272 Area (sq ft) 3.18 223.55 24.94
Q Total (cfs) 505.00 Flow (cfs) 1.26 477.82 25.92
Top Width (ft) 153.81 Top Width (ft) 30.48 69.88 53.45
Vel Total (ft/s) 2.01 Avg. Vel. (ft/s) 0.40 2.14 1.04
Max Chl Dpth (ft) 5.95 Hydr. Depth (ft) 0.10 3.20 0.47
Conv. Total (cfs) 10593.9 Conv. (cfs) 26.4 10023.8 543.7
Length Wtd. (ft) 99.77 Wetted Per. (ft) 30.49 71.29 53.46
Min Ch El (ft) 96.82 Shear (lb/sq ft) 0.01 0.44 0.07
Alpha 1.09 Stream Power (lb/ft s) 899.13 0.00 0.00
Frctn Loss (ft) 0.11 Cum Volume (acre-ft) 22.41 10.78 56.18
C & E Loss (ft) 0.01 Cum SA (acres) 3.04 1.33 12.69
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1399 Profile: PF 1
E.G. Elev (ft) 102.71 Element Left OB Channel Right OB
Vel Head (ft) 0.03 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.69 Reach Len. (ft) 100.17 100.52 101.00
Crit W.S. (ft) Flow Area (sq ft) 36.00 187.54 177.78
E.G. Slope (ft/ft) 0.000663 Area (sq ft) 36.00 187.54 177.78
Q Total (cfs) 505.00 Flow (cfs) 20.84 277.69 206.47
Top Width (ft) 260.04 Top Width (ft) 92.54 39.54 127.95
Vel Total (ft/s) 1.26 Avg. Vel. (ft/s) 0.58 1.48 1.16
Max Chl Dpth (ft) 6.80 Hydr. Depth (ft) 0.39 4.74 1.39
Conv. Total (cfs) 19616.3 Conv. (cfs) 809.4 10786.7 8020.3
Length Wtd. (ft) 100.75 Wetted Per. (ft) 92.60 41.16 128.01
Min Ch El (ft) 95.89 Shear (lb/sq ft) 0.02 0.19 0.06
Alpha 1.12 Stream Power (lb/ft s) 919.87 0.00 0.00
Frctn Loss (ft) 0.02 Cum Volume (acre-ft) 22.36 10.31 55.94
C & E Loss (ft) 0.01 Cum SA (acres) 2.90 1.20 12.48
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1299 Profile: PF 1
E.G. Elev (ft) 102.69 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.69 Reach Len. (ft) 91.61 99.84 106.94
Crit W.S. (ft) Flow Area (sq ft) 142.15 220.04 904.37
E.G. Slope (ft/ft) 0.000066 Area (sq ft) 142.15 220.04 904.37
Q Total (cfs) 505.00 Flow (cfs) 63.37 113.19 328.44
Top Width (ft) 778.66 Top Width (ft) 75.42 40.73 662.51
Vel Total (ft/s) 0.40 Avg. Vel. (ft/s) 0.45 0.51 0.36
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1299 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 7.17 Hydr. Depth (ft) 1.88 5.40 1.37
Conv. Total (cfs) 62010.5 Conv. (cfs) 7780.9 13899.5 40330.1
Length Wtd. (ft) 103.63 Wetted Per. (ft) 76.59 41.96 662.58
Min Ch El (ft) 95.52 Shear (lb/sq ft) 0.01 0.02 0.01
Alpha 1.07 Stream Power (lb/ft s) 891.84 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 22.16 9.84 54.69
C & E Loss (ft) 0.00 Cum SA (acres) 2.71 1.11 11.57
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1199 Profile: PF 1
E.G. Elev (ft) 102.69 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 91.09 98.94 107.40
Crit W.S. (ft) Flow Area (sq ft) 214.17 261.18 1363.57
E.G. Slope (ft/ft) 0.000019 Area (sq ft) 214.17 261.18 1363.57
Q Total (cfs) 505.00 Flow (cfs) 66.84 77.14 361.02
Top Width (ft) 760.42 Top Width (ft) 75.61 44.76 640.05
Vel Total (ft/s) 0.27 Avg. Vel. (ft/s) 0.31 0.30 0.26
Max Chl Dpth (ft) 7.44 Hydr. Depth (ft) 2.83 5.84 2.13
Conv. Total (cfs) 114442.9 Conv. (cfs) 15147.2 17480.5 81815.2
Length Wtd. (ft) 104.18 Wetted Per. (ft) 78.57 45.67 640.12
Min Ch El (ft) 95.24 Shear (lb/sq ft) 0.00 0.01 0.00
Alpha 1.01 Stream Power (lb/ft s) 851.98 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 21.78 9.29 51.90
C & E Loss (ft) 0.00 Cum SA (acres) 2.55 1.01 9.97
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1100 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 100.24 99.86 99.71
Crit W.S. (ft) Flow Area (sq ft) 186.42 314.34 1549.52
E.G. Slope (ft/ft) 0.000012 Area (sq ft) 186.42 314.34 1549.52
Q Total (cfs) 505.00 Flow (cfs) 53.11 75.63 376.26
Top Width (ft) 695.18 Top Width (ft) 52.35 52.32 590.51
Vel Total (ft/s) 0.25 Avg. Vel. (ft/s) 0.28 0.24 0.24
Max Chl Dpth (ft) 7.71 Hydr. Depth (ft) 3.56 6.01 2.62
Conv. Total (cfs) 143377.9 Conv. (cfs) 15079.9 21472.8 106825.2
Length Wtd. (ft) 99.80 Wetted Per. (ft) 55.91 53.31 590.61
Min Ch El (ft) 94.97 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.01 Stream Power (lb/ft s) 788.49 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 21.36 8.63 48.31
C & E Loss (ft) 0.00 Cum SA (acres) 2.41 0.90 8.45
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 1000 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 99.16 99.52 99.72
Crit W.S. (ft) Flow Area (sq ft) 334.74 211.67 1798.26
E.G. Slope (ft/ft) 0.000007 Area (sq ft) 334.74 211.67 1798.26
Q Total (cfs) 505.00 Flow (cfs) 78.74 41.37 384.89
Top Width (ft) 656.01 Top Width (ft) 83.50 31.03 541.48
Vel Total (ft/s) 0.22 Avg. Vel. (ft/s) 0.24 0.20 0.21
Max Chl Dpth (ft) 8.32 Hydr. Depth (ft) 4.01 6.82 3.32
Conv. Total (cfs) 190317.1 Conv. (cfs) 29674.9 15591.2 145051.0
Length Wtd. (ft) 99.65 Wetted Per. (ft) 87.50 32.06 541.58
Min Ch El (ft) 94.36 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.01 Stream Power (lb/ft s) 747.96 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 20.76 8.03 44.48
C & E Loss (ft) 0.00 Cum SA (acres) 2.26 0.81 7.15
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 901 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 100.03 100.24 100.87
Crit W.S. (ft) Flow Area (sq ft) 91.52 210.77 1852.00
E.G. Slope (ft/ft) 0.000007 Area (sq ft) 91.52 210.77 1852.00
Q Total (cfs) 505.00 Flow (cfs) 22.14 43.42 439.44
Top Width (ft) 538.01 Top Width (ft) 19.02 29.13 489.86
Vel Total (ft/s) 0.23 Avg. Vel. (ft/s) 0.24 0.21 0.24
Max Chl Dpth (ft) 8.93 Hydr. Depth (ft) 4.81 7.24 3.78
Conv. Total (cfs) 187164.0 Conv. (cfs) 8204.0 16092.6 162867.4
Length Wtd. (ft) 100.78 Wetted Per. (ft) 23.52 30.25 489.97
Min Ch El (ft) 93.75 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.00 Stream Power (lb/ft s) 639.02 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 20.28 7.55 40.30
C & E Loss (ft) 0.00 Cum SA (acres) 2.14 0.74 5.97
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 800 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 147.04 119.01 85.12
Crit W.S. (ft) Flow Area (sq ft) 105.55 210.58 1951.41
E.G. Slope (ft/ft) 0.000008 Area (sq ft) 105.55 210.58 1951.41
Q Total (cfs) 635.00 Flow (cfs) 27.86 47.66 559.48
Top Width (ft) 475.56 Top Width (ft) 21.30 27.52 426.74
Vel Total (ft/s) 0.28 Avg. Vel. (ft/s) 0.26 0.23 0.29
Max Chl Dpth (ft) 9.48 Hydr. Depth (ft) 4.96 7.65 4.57
Conv. Total (cfs) 221102.4 Conv. (cfs) 9701.6 16595.4 194805.4
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 800 Profile: PF 1 (Continued)
Length Wtd. (ft) 91.29 Wetted Per. (ft) 26.14 28.82 426.86
Min Ch El (ft) 93.20 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.01 Stream Power (lb/ft s) 589.18 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 20.05 7.06 35.90
C & E Loss (ft) 0.00 Cum SA (acres) 2.09 0.67 4.91
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 681 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 21.00 21.00 21.00
Crit W.S. (ft) 95.77 Flow Area (sq ft) 137.64 411.15 2178.34
E.G. Slope (ft/ft) 0.000005 Area (sq ft) 137.64 411.15 2178.34
Q Total (cfs) 635.00 Flow (cfs) 29.97 77.94 527.09
Top Width (ft) 490.77 Top Width (ft) 26.32 48.77 415.68
Vel Total (ft/s) 0.23 Avg. Vel. (ft/s) 0.22 0.19 0.24
Max Chl Dpth (ft) 10.19 Hydr. Depth (ft) 5.23 8.43 5.24
Conv. Total (cfs) 286670.9 Conv. (cfs) 13529.4 35186.0 237955.5
Length Wtd. (ft) 21.00 Wetted Per. (ft) 30.81 49.72 416.28
Min Ch El (ft) 92.49 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.02 Stream Power (lb/ft s) 498.73 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 19.64 6.21 31.86
C & E Loss (ft) 0.00 Cum SA (acres) 2.01 0.57 4.09
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 660 BR U Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 40.00 40.00 40.00
Crit W.S. (ft) 98.30 Flow Area (sq ft) 120.50 294.50 1626.62
E.G. Slope (ft/ft) 0.000014 Area (sq ft) 120.50 294.50 1626.62
Q Total (cfs) 635.00 Flow (cfs) 40.60 48.06 546.34
Top Width (ft) 490.74 Top Width (ft) 26.32 48.77 415.65
Vel Total (ft/s) 0.31 Avg. Vel. (ft/s) 0.34 0.16 0.34
Max Chl Dpth (ft) 10.19 Hydr. Depth (ft) 4.58 6.04 3.91
Conv. Total (cfs) 169998.2 Conv. (cfs) 10868.0 12867.0 146263.2
Length Wtd. (ft) 40.00 Wetted Per. (ft) 30.69 97.63 416.23
Min Ch El (ft) 92.49 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.10 Stream Power (lb/ft s) 498.73 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 19.58 6.04 30.95
C & E Loss (ft) 0.00 Cum SA (acres) 2.00 0.54 3.89
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 660 BR D Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 29.41 29.41 29.41
Crit W.S. (ft) 94.88 Flow Area (sq ft) 1626.26 383.25 1542.48
E.G. Slope (ft/ft) 0.000003 Area (sq ft) 1626.26 383.25 1542.48
Q Total (cfs) 635.00 Flow (cfs) 315.90 33.14 285.95
Top Width (ft) 716.45 Top Width (ft) 324.14 62.68 329.63
Vel Total (ft/s) 0.18 Avg. Vel. (ft/s) 0.19 0.09 0.19
Max Chl Dpth (ft) 11.54 Hydr. Depth (ft) 5.02 6.11 4.68
Conv. Total (cfs) 344048.5 Conv. (cfs) 171159.4 17956.7 154932.4
Length Wtd. (ft) 29.41 Wetted Per. (ft) 328.62 114.41 334.31
Min Ch El (ft) 91.14 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.08 Stream Power (lb/ft s) 716.45 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 18.78 5.73 29.49
C & E Loss (ft) 0.00 Cum SA (acres) 1.84 0.49 3.55
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 591 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 80.47 90.54 97.98
Crit W.S. (ft) Flow Area (sq ft) 1774.62 542.13 2302.31
E.G. Slope (ft/ft) 0.000001 Area (sq ft) 1774.62 542.13 2302.31
Q Total (cfs) 635.00 Flow (cfs) 229.89 54.53 350.59
Top Width (ft) 716.45 Top Width (ft) 324.14 62.68 329.63
Vel Total (ft/s) 0.14 Avg. Vel. (ft/s) 0.13 0.10 0.15
Max Chl Dpth (ft) 11.54 Hydr. Depth (ft) 5.47 8.65 6.98
Conv. Total (cfs) 546800.7 Conv. (cfs) 197955.7 46954.9 301890.1
Length Wtd. (ft) 92.13 Wetted Per. (ft) 328.65 64.39 334.54
Min Ch El (ft) 91.14 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.04 Stream Power (lb/ft s) 716.45 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 17.63 5.42 28.19
C & E Loss (ft) 0.00 Cum SA (acres) 1.62 0.45 3.32
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 500 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 99.37 102.60 106.23
Crit W.S. (ft) Flow Area (sq ft) 976.69 398.83 2481.34
E.G. Slope (ft/ft) 0.000002 Area (sq ft) 976.69 398.83 2481.34
Q Total (cfs) 635.00 Flow (cfs) 151.77 46.30 436.93
Top Width (ft) 518.49 Top Width (ft) 150.00 42.65 325.84
Vel Total (ft/s) 0.16 Avg. Vel. (ft/s) 0.16 0.12 0.18
Max Chl Dpth (ft) 11.18 Hydr. Depth (ft) 6.51 9.35 7.62
Conv. Total (cfs) 502119.4 Conv. (cfs) 120012.3 36609.5 345497.7
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 500 Profile: PF 1 (Continued)
Length Wtd. (ft) 103.99 Wetted Per. (ft) 156.45 43.42 329.51
Min Ch El (ft) 91.50 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.04 Stream Power (lb/ft s) 518.49 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 15.09 4.44 22.81
C & E Loss (ft) 0.00 Cum SA (acres) 1.18 0.34 2.59
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 398 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 92.13 104.81 116.86
Crit W.S. (ft) Flow Area (sq ft) 1580.28 261.56 2368.34
E.G. Slope (ft/ft) 0.000001 Area (sq ft) 1580.28 261.56 2368.34
Q Total (cfs) 648.00 Flow (cfs) 227.32 28.42 392.25
Top Width (ft) 553.33 Top Width (ft) 237.07 26.47 289.79
Vel Total (ft/s) 0.15 Avg. Vel. (ft/s) 0.14 0.11 0.17
Max Chl Dpth (ft) 10.80 Hydr. Depth (ft) 6.67 9.88 8.17
Conv. Total (cfs) 567885.5 Conv. (cfs) 199217.8 24910.3 343757.4
Length Wtd. (ft) 108.40 Wetted Per. (ft) 243.59 26.95 295.49
Min Ch El (ft) 91.88 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.03 Stream Power (lb/ft s) 553.33 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 12.17 3.67 16.90
C & E Loss (ft) 0.00 Cum SA (acres) 0.74 0.26 1.84
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 293 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 18.00 18.00 18.00
Crit W.S. (ft) 94.31 Flow Area (sq ft) 944.48 385.86 1986.29
E.G. Slope (ft/ft) 0.000002 Area (sq ft) 944.48 385.86 1986.29
Q Total (cfs) 648.00 Flow (cfs) 177.05 51.25 419.71
Top Width (ft) 409.27 Top Width (ft) 131.95 40.69 236.63
Vel Total (ft/s) 0.20 Avg. Vel. (ft/s) 0.19 0.13 0.21
Max Chl Dpth (ft) 11.12 Hydr. Depth (ft) 7.16 9.48 8.39
Conv. Total (cfs) 450577.5 Conv. (cfs) 123105.8 35635.1 291836.6
Length Wtd. (ft) 18.00 Wetted Per. (ft) 138.48 41.63 243.34
Min Ch El (ft) 91.56 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.05 Stream Power (lb/ft s) 409.27 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 9.50 2.89 11.06
C & E Loss (ft) 0.00 Cum SA (acres) 0.35 0.18 1.13
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 275 BR U Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 16.00 16.00 16.00
Crit W.S. (ft) 94.27 Flow Area (sq ft) 944.46 315.12 1983.35
E.G. Slope (ft/ft) 0.000002 Area (sq ft) 944.46 315.12 1983.35
Q Total (cfs) 648.00 Flow (cfs) 186.35 21.67 439.98
Top Width (ft) 409.27 Top Width (ft) 131.95 40.69 236.63
Vel Total (ft/s) 0.20 Avg. Vel. (ft/s) 0.20 0.07 0.22
Max Chl Dpth (ft) 11.12 Hydr. Depth (ft) 7.16 7.74 8.38
Conv. Total (cfs) 428066.2 Conv. (cfs) 123102.4 14317.7 290646.1
Length Wtd. (ft) 16.00 Wetted Per. (ft) 138.48 98.51 243.93
Min Ch El (ft) 91.56 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.12 Stream Power (lb/ft s) 409.27 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 9.11 2.74 10.24
C & E Loss (ft) 0.00 Cum SA (acres) 0.30 0.16 1.03
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 275 BR D Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 57.88 57.88 57.88
Crit W.S. (ft) 94.37 Flow Area (sq ft) 639.02 389.00 1953.92
E.G. Slope (ft/ft) 0.000003 Area (sq ft) 639.02 389.00 1953.92
Q Total (cfs) 648.00 Flow (cfs) 139.28 37.70 471.03
Top Width (ft) 393.06 Top Width (ft) 90.39 48.87 253.80
Vel Total (ft/s) 0.22 Avg. Vel. (ft/s) 0.22 0.10 0.24
Max Chl Dpth (ft) 12.24 Hydr. Depth (ft) 7.07 7.96 7.70
Conv. Total (cfs) 378890.1 Conv. (cfs) 81436.0 22040.7 275413.4
Length Wtd. (ft) 57.88 Wetted Per. (ft) 96.91 87.33 254.74
Min Ch El (ft) 90.44 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.12 Stream Power (lb/ft s) 395.35 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 8.82 2.61 9.52
C & E Loss (ft) 0.00 Cum SA (acres) 0.26 0.15 0.94
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 201 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 99.96 101.61 103.71
Crit W.S. (ft) Flow Area (sq ft) 639.02 458.78 1954.07
E.G. Slope (ft/ft) 0.000003 Area (sq ft) 639.02 458.78 1954.07
Q Total (cfs) 648.00 Flow (cfs) 132.23 68.25 447.52
Top Width (ft) 393.06 Top Width (ft) 90.39 48.87 253.80
Vel Total (ft/s) 0.21 Avg. Vel. (ft/s) 0.21 0.15 0.23
Max Chl Dpth (ft) 12.24 Hydr. Depth (ft) 7.07 9.39 7.70
Conv. Total (cfs) 399081.8 Conv. (cfs) 81434.2 42032.7 275615.0
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 201 Profile: PF 1 (Continued)
Length Wtd. (ft) 103.03 Wetted Per. (ft) 96.91 50.09 254.51
Min Ch El (ft) 90.44 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.05 Stream Power (lb/ft s) 395.35 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 7.97 2.05 6.92
C & E Loss (ft) 0.00 Cum SA (acres) 0.14 0.08 0.60
Plan: Plan 06 Tank Farm Creek TankFarmCreek (2 RS: 99 Profile: PF 1
E.G. Elev (ft) 102.68 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.68 Reach Len. (ft) 99.00 99.00 99.00
Crit W.S. (ft) Flow Area (sq ft) 194.56 191.35 1947.95
E.G. Slope (ft/ft) 0.000004 Area (sq ft) 194.56 191.35 1947.95
Q Total (cfs) 648.00 Flow (cfs) 46.22 33.96 567.82
Top Width (ft) 302.14 Top Width (ft) 28.32 19.83 253.99
Vel Total (ft/s) 0.28 Avg. Vel. (ft/s) 0.24 0.18 0.29
Max Chl Dpth (ft) 12.48 Hydr. Depth (ft) 6.87 9.65 7.67
Conv. Total (cfs) 312477.3 Conv. (cfs) 22289.8 16373.7 273813.8
Length Wtd. (ft) 99.00 Wetted Per. (ft) 34.62 23.14 255.02
Min Ch El (ft) 90.20 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.04 Stream Power (lb/ft s) 304.20 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 7.02 1.29 2.28
C & E Loss (ft) 0.00 Cum SA (acres)
HEC-RAS Plan: PostObst Locations: User Defined Profile: PF 1
River Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl
(cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft)
Tank Farm Creek TankFarmCreek (2 4701 PF 1 133.00 113.00 114.92 114.22 114.95 0.000791 1.24 107.09 100.00 0.21
Tank Farm Creek TankFarmCreek (2 4597 PF 1 133.00 112.66 114.87 114.89 0.000355 0.98 136.13 100.00 0.15
Tank Farm Creek TankFarmCreek (2 4498 PF 1 133.00 112.33 114.85 114.86 0.000190 0.81 164.52 100.00 0.11
Tank Farm Creek TankFarmCreek (2 4400 PF 1 133.00 112.00 114.84 114.85 0.000106 0.68 196.56 100.00 0.09
Tank Farm Creek TankFarmCreek (2 4298 PF 1 133.00 111.66 114.83 114.84 0.000063 0.58 229.83 99.90 0.07
Tank Farm Creek TankFarmCreek (2 4198 PF 1 133.00 111.33 114.83 114.83 0.000041 0.51 262.29 100.00 0.06
Tank Farm Creek TankFarmCreek (2 4098 PF 1 133.00 111.00 114.83 114.83 0.000028 0.45 294.37 100.00 0.05
Tank Farm Creek TankFarmCreek (2 3999 PF 1 185.00 110.66 114.82 114.83 0.000038 0.56 328.75 100.00 0.05
Tank Farm Creek TankFarmCreek (2 3797 PF 1 185.00 109.49 114.74 112.31 114.79 0.002421 1.87 101.11 53.14 0.20
Tank Farm Creek TankFarmCreek (2 3698 PF 1 344.00 108.84 114.39 112.53 114.49 0.003465 2.30 140.53 65.36 0.25
Tank Farm Creek TankFarmCreek (2 3595 PF 1 344.00 108.03 114.20 111.77 114.26 0.001471 1.42 197.02 90.20 0.16
Tank Farm Creek TankFarmCreek (2 3500 PF 1 344.00 107.87 113.73 111.65 113.95 0.010425 3.71 92.66 37.83 0.42
Tank Farm Creek TankFarmCreek (2 3399 PF 1 376.00 107.63 113.33 111.60 113.41 0.003008 2.03 169.95 94.28 0.23
Tank Farm Creek TankFarmCreek (2 3300 PF 1 376.00 107.11 113.00 111.04 113.09 0.003347 2.04 163.21 82.13 0.24
Tank Farm Creek TankFarmCreek (2 3200 PF 1 424.00 107.07 112.77 111.80 112.84 0.002033 2.14 200.77 106.16 0.19
Tank Farm Creek TankFarmCreek (2 3050 PF 1 424.00 106.22 112.55 110.03 112.60 0.001195 1.71 240.43 95.37 0.15
Tank Farm Creek TankFarmCreek (2 2922 PF 1 424.00 105.98 112.31 109.70 112.38 0.002603 2.34 196.07 108.45 0.22
Tank Farm Creek TankFarmCreek (2 2900 Culvert
Tank Farm Creek TankFarmCreek (2 2851 PF 1 424.00 105.89 112.27 109.77 112.33 0.001463 2.01 223.05 101.44 0.17
Tank Farm Creek TankFarmCreek (2 2700 PF 1 424.00 105.66 111.85 109.28 111.96 0.004125 2.72 154.83 62.99 0.27
Tank Farm Creek TankFarmCreek (2 2592 PF 1 424.00 105.08 111.10 108.85 111.36 0.007668 4.07 105.46 35.79 0.38
Tank Farm Creek TankFarmCreek (2 2500 PF 1 424.00 104.59 109.91 108.41 110.37 0.015376 5.41 78.42 23.10 0.52
Tank Farm Creek TankFarmCreek (2 2397 PF 1 587.00 103.03 109.11 107.09 109.29 0.007435 3.69 173.12 106.13 0.36
Tank Farm Creek TankFarmCreek (2 2297 PF 1 587.00 102.07 108.26 105.79 108.53 0.007893 4.17 141.67 45.79 0.39
Tank Farm Creek TankFarmCreek (2 2200 PF 1 587.00 101.41 107.45 105.14 107.73 0.008703 4.26 138.88 48.14 0.41
Tank Farm Creek TankFarmCreek (2 2097 PF 1 604.00 100.77 106.74 104.17 106.98 0.006062 3.93 153.53 36.99 0.34
Tank Farm Creek TankFarmCreek (2 2001 PF 1 604.00 100.16 106.11 106.37 0.006532 4.04 149.60 38.07 0.36
Tank Farm Creek TankFarmCreek (2 1900 PF 1 604.00 99.58 105.40 105.66 0.007542 4.09 147.59 41.29 0.38
Tank Farm Creek TankFarmCreek (2 1800 PF 1 621.00 99.07 104.57 104.84 0.008932 4.22 147.13 44.46 0.41
Tank Farm Creek TankFarmCreek (2 1700 PF 1 621.00 98.48 103.93 104.13 0.005521 3.56 178.40 60.91 0.33
Tank Farm Creek TankFarmCreek (2 1600 PF 1 621.00 97.76 103.52 103.64 0.003896 2.77 223.91 69.85 0.27
Tank Farm Creek TankFarmCreek (2 1499 PF 1 621.00 96.82 103.21 103.31 0.002657 2.56 248.94 84.99 0.23
Tank Farm Creek TankFarmCreek (2 1399 PF 1 621.00 95.89 102.95 103.07 0.002238 2.82 233.84 71.77 0.22
Tank Farm Creek TankFarmCreek (2 1299 PF 1 621.00 95.52 102.91 102.94 0.000596 1.58 408.09 121.70 0.12
Tank Farm Creek TankFarmCreek (2 1199 PF 1 621.00 95.24 102.88 102.90 0.000255 1.09 544.69 130.77 0.08
Tank Farm Creek TankFarmCreek (2 1100 PF 1 621.00 94.97 102.86 102.88 0.000172 0.91 612.94 123.09 0.06
Tank Farm Creek TankFarmCreek (2 1000 PF 1 621.00 94.36 102.85 102.86 0.000129 0.85 639.20 127.72 0.06
Tank Farm Creek TankFarmCreek (2 901 PF 1 621.00 93.75 102.82 102.85 0.000182 1.04 504.04 80.57 0.07
Tank Farm Creek TankFarmCreek (2 800 PF 1 793.00 93.20 102.81 102.83 0.000157 1.00 635.71 97.87 0.06
Tank Farm Creek TankFarmCreek (2 681 PF 1 793.00 92.49 102.80 96.30 102.82 0.000086 0.80 874.59 126.13 0.05
Tank Farm Creek TankFarmCreek (2 660 Bridge
Tank Farm Creek TankFarmCreek (2 591 PF 1 793.00 91.14 102.79 102.79 0.000002 0.12 4699.18 716.45 0.01
Tank Farm Creek TankFarmCreek (2 500 PF 1 793.00 91.50 102.79 102.79 0.000002 0.14 3914.75 518.49 0.01
Tank Farm Creek TankFarmCreek (2 398 PF 1 793.00 91.88 102.79 102.79 0.000002 0.13 4271.95 553.33 0.01
Tank Farm Creek TankFarmCreek (2 293 PF 1 793.00 91.56 102.79 94.39 102.79 0.000003 0.16 3362.23 409.27 0.01
Tank Farm Creek TankFarmCreek (2 275 Bridge
Tank Farm Creek TankFarmCreek (2 201 PF 1 793.00 90.44 102.79 102.79 0.000004 0.18 3095.64 393.88 0.01
Tank Farm Creek TankFarmCreek (2 99 PF 1 793.00 90.20 102.79 102.79 0.000006 0.21 2367.39 302.76 0.01
0200400600800100012001400113114115116117118PostDevelopmentTankFarmCreek - Station 47+01 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.035.041020040060080010001200112113114115116117118Station (ft) PostDevelopmentTankFarmCreek - Station 45+97 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.035.041
020040060080010001200112113114115116117118PostDevelopmentTankFarmCreek - Station 44+98 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.035.04102004006008001000112113114115116117Station (ft) PostDevelopmentTankFarmCreek - Station 44+00 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.035.041
02004006008001000111112113114115116117118119PostDevelopmentTankFarmCreek - Station 42+98 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.035.04102004006008001000111112113114115116117118Station (ft) PostDevelopmentTankFarmCreek - Station 41+98 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.035.041
020040060080010001200111112113114115116117118PostDevelopmentTankFarmCreek - Station 40+98 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.035.04102004006008001000110111112113114115116117118Station (ft) PostDevelopmentTankFarmCreek - Station 39+99 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.035.041
0100200300400500600700800108110112114116118120PostDevelopmentTankFarmCreek - Station 37+97 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.0410200400600800108110112114116118120Station (ft) PostDevelopmentTankFarmCreek - Station 36+98 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
02004006008001000108110112114116118120PostDevelopmentTankFarmCreek - Station 35+95 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.0410500100015002000106108110112114116118120Station (ft) PostDevelopmentTankFarmCreek - Station 35+00 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
020040060080010001200140016001800106108110112114116118120PostDevelopmentTankFarmCreek - Station 33+99 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.0410500100015002000106108110112114116118120Station (ft) PostDevelopmentTankFarmCreek - Station 33+00 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
0500100015002000106108110112114116118PostDevelopmentTankFarmCreek - Station 32+00 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.0410500100015002000106108110112114116118120Station (ft) PostDevelopmentTankFarmCreek - Station 30+50 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
020040060080010001200140016001800104106108110112114116118120122PostDevelopmentTankFarmCreek - Station 29+22 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041020040060080010001200140016001800104106108110112114116118120122Station (ft) PostDevelopmentTankFarmCreek - Station 29+00 Culvert US Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
02004006008001000120014001600104106108110112114116118120PostDevelopmentTankFarmCreek - Station 29+00 Culvert DS Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.04102004006008001000120014001600104106108110112114116118120Station (ft) PostDevelopmentTankFarmCreek - Station 28+51 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
02004006008001000120014001600104106108110112114116118120PostDevelopmentTankFarmCreek - Station 27+00 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.0410200400600800100012001400104106108110112114116118120Station (ft) PostDevelopmentTankFarmCreek - Station 25+92 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
020040060080010001200104106108110112114116118120PostDevelopmentTankFarmCreek - Station 25+00 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.04102004006008001000102104106108110112114116Station (ft) PostDevelopmentTankFarmCreek - Station 23+97 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
02004006008001000102104106108110112114116PostDevelopmentTankFarmCreek - Station 22+97 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.04102004006008001000100102104106108110112114116Station (ft) PostDevelopmentTankFarmCreek - Station 22+00 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041
02004006008001000100102104106108110112114116PostDevelopmentTankFarmCreek - Station 20+97 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundLeveeBank Sta.041.071.041020040060080010001200100102104106108110112114Station (ft) PostDevelopmentTankFarmCreek - Station 20+01 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
0200400600800100098100102104106108110112PostDevelopmentTankFarmCreek - Station 19+00 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.0410200400600800100098100102104106108110112114Station (ft) PostDevelopmentTankFarmCreek - Station 18+00 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
0200400600800100098100102104106108110112PostDevelopmentTankFarmCreek - Station 17+00 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041020040060080010009698100102104106108110112114Station (ft) PostDevelopmentTankFarmCreek - Station 16+00 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
020040060080010009698100102104106108110PostDevelopmentTankFarmCreek - Station 14+99 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.04102004006008001000949698100102104106108110112Station (ft) PostDevelopmentTankFarmCreek - Station 13+99 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
02004006008001000949698100102104106108110PostDevelopmentTankFarmCreek - Station 12+99 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.04102004006008001000949698100102104106108110Station (ft) PostDevelopmentTankFarmCreek - Station 11+99 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
0200400600800949698100102104106108110PostDevelopmentTankFarmCreek - Station 11+00 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.0410100200300400500600700800949698100102104106108110Station (ft) PostDevelopmentTankFarmCreek - Station 10+00 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
010020030040050060070092949698100102104106108110PostDevelopmentTankFarmCreek - Station 9+01 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.04101002003004005006009095100105110115Station (ft) PostDevelopmentTankFarmCreek - Station 8+00 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
010020030040050092949698100102104PostDevelopmentTankFarmCreek - Station 6+81 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.041010020030040050092949698100102104Station (ft) PostDevelopmentTankFarmCreek - Station 6+60 Bridge US Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.041
01002003004005006007008009092949698100102104PostDevelopmentTankFarmCreek - Station 6+60 Bridge DS Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.04101002003004005006007008009092949698100102104Station (ft) PostDevelopmentTankFarmCreek - Station 5+91 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
01002003004005006009092949698100102104PostDevelopmentTankFarmCreek - Station 5+00 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.04101002003004005006009092949698100102104Station (ft) PostDevelopmentTankFarmCreek - Station 3+98 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
01002003004005009092949698100102104PostDevelopmentTankFarmCreek - Station 2+93 Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.04101002003004005009092949698100102104Station (ft) PostDevelopmentTankFarmCreek - Station 2+75 Bridge US Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.041
01002003004009092949698100102104PostDevelopmentTankFarmCreek - Station 2+75 Bridge DS Plan: Plan 18 9/14/2015 Elevation (ft)LegendEG PF 1WS PF 1Crit PF 1GroundBank Sta.041.071.04101002003004009092949698100102104Station (ft) PostDevelopmentTankFarmCreek - Station 2+01 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
0501001502002503003509092949698100102104PostDevelopmentTankFarmCreek - Station 0+99 Plan: Plan 18 9/14/2015 Station (ft)Elevation (ft)LegendEG PF 1WS PF 1GroundBank Sta.041.071.041
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 4701 Profile: PF 1
E.G. Elev (ft) 114.95 Element Left OB Channel Right OB
Vel Head (ft) 0.02 Wt. n-Val. 0.035
W.S. Elev (ft) 114.92 Reach Len. (ft) 59.22 104.68 138.39
Crit W.S. (ft) 114.22 Flow Area (sq ft) 107.09
E.G. Slope (ft/ft) 0.000791 Area (sq ft) 107.09
Q Total (cfs) 133.00 Flow (cfs) 133.00
Top Width (ft) 100.00 Top Width (ft) 100.00
Vel Total (ft/s) 1.24 Avg. Vel. (ft/s) 1.24
Max Chl Dpth (ft) 1.92 Hydr. Depth (ft) 1.07
Conv. Total (cfs) 4728.6 Conv. (cfs) 4728.6
Length Wtd. (ft) 104.68 Wetted Per. (ft) 100.96
Min Ch El (ft) 113.00 Shear (lb/sq ft) 0.05
Alpha 1.00 Stream Power (lb/ft s) 1210.65 0.00 0.00
Frctn Loss (ft) 0.05 Cum Volume (acre-ft) 23.38 22.05 34.35
C & E Loss (ft) 0.00 Cum SA (acres) 3.39 5.23 5.19
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 4597 Profile: PF 1
E.G. Elev (ft) 114.89 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.000 0.035
W.S. Elev (ft) 114.87 Reach Len. (ft) 98.34 99.16 100.22
Crit W.S. (ft) Flow Area (sq ft) 0.00 136.13
E.G. Slope (ft/ft) 0.000355 Area (sq ft) 0.00 136.13
Q Total (cfs) 133.00 Flow (cfs) 0.00 133.00
Top Width (ft) 100.00 Top Width (ft) 100.00
Vel Total (ft/s) 0.98 Avg. Vel. (ft/s) 0.01 0.98
Max Chl Dpth (ft) 2.21 Hydr. Depth (ft) 0.61 1.36
Conv. Total (cfs) 7061.2 Conv. (cfs) 0.0 7061.2
Length Wtd. (ft) 99.16 Wetted Per. (ft) 0.62 100.79
Min Ch El (ft) 112.66 Shear (lb/sq ft) 0.03
Alpha 1.00 Stream Power (lb/ft s) 1038.00 0.00 0.00
Frctn Loss (ft) 0.03 Cum Volume (acre-ft) 23.38 21.75 34.35
C & E Loss (ft) 0.00 Cum SA (acres) 3.39 4.99 5.19
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 4498 Profile: PF 1
E.G. Elev (ft) 114.86 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.035
W.S. Elev (ft) 114.85 Reach Len. (ft) 97.84 97.84 97.85
Crit W.S. (ft) Flow Area (sq ft) 164.52
E.G. Slope (ft/ft) 0.000190 Area (sq ft) 164.52
Q Total (cfs) 133.00 Flow (cfs) 133.00
Top Width (ft) 100.00 Top Width (ft) 100.00
Vel Total (ft/s) 0.81 Avg. Vel. (ft/s) 0.81
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 4498 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 2.52 Hydr. Depth (ft) 1.65
Conv. Total (cfs) 9641.4 Conv. (cfs) 9641.4
Length Wtd. (ft) 97.84 Wetted Per. (ft) 101.44
Min Ch El (ft) 112.33 Shear (lb/sq ft) 0.02
Alpha 1.00 Stream Power (lb/ft s) 1072.72 0.00 0.00
Frctn Loss (ft) 0.01 Cum Volume (acre-ft) 23.38 21.41 34.35
C & E Loss (ft) 0.00 Cum SA (acres) 3.39 4.76 5.19
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 4400 Profile: PF 1
E.G. Elev (ft) 114.85 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.035
W.S. Elev (ft) 114.84 Reach Len. (ft) 102.22 102.12 102.01
Crit W.S. (ft) Flow Area (sq ft) 196.56
E.G. Slope (ft/ft) 0.000106 Area (sq ft) 196.56
Q Total (cfs) 133.00 Flow (cfs) 133.00
Top Width (ft) 100.00 Top Width (ft) 100.00
Vel Total (ft/s) 0.68 Avg. Vel. (ft/s) 0.68
Max Chl Dpth (ft) 2.84 Hydr. Depth (ft) 1.97
Conv. Total (cfs) 12947.9 Conv. (cfs) 12947.9
Length Wtd. (ft) 102.12 Wetted Per. (ft) 101.70
Min Ch El (ft) 112.00 Shear (lb/sq ft) 0.01
Alpha 1.00 Stream Power (lb/ft s) 882.07 0.00 0.00
Frctn Loss (ft) 0.01 Cum Volume (acre-ft) 23.38 21.01 34.35
C & E Loss (ft) 0.00 Cum SA (acres) 3.39 4.54 5.19
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 4298 Profile: PF 1
E.G. Elev (ft) 114.84 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.035
W.S. Elev (ft) 114.83 Reach Len. (ft) 99.86 99.96 100.07
Crit W.S. (ft) Flow Area (sq ft) 229.83
E.G. Slope (ft/ft) 0.000063 Area (sq ft) 229.83
Q Total (cfs) 133.00 Flow (cfs) 133.00
Top Width (ft) 99.90 Top Width (ft) 99.90
Vel Total (ft/s) 0.58 Avg. Vel. (ft/s) 0.58
Max Chl Dpth (ft) 3.17 Hydr. Depth (ft) 2.30
Conv. Total (cfs) 16736.4 Conv. (cfs) 16736.4
Length Wtd. (ft) 99.96 Wetted Per. (ft) 102.30
Min Ch El (ft) 111.66 Shear (lb/sq ft) 0.01
Alpha 1.00 Stream Power (lb/ft s) 897.53 0.00 0.00
Frctn Loss (ft) 0.01 Cum Volume (acre-ft) 23.38 20.51 34.35
C & E Loss (ft) 0.00 Cum SA (acres) 3.39 4.31 5.19
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 4198 Profile: PF 1
E.G. Elev (ft) 114.83 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.035
W.S. Elev (ft) 114.83 Reach Len. (ft) 100.00 100.00 100.00
Crit W.S. (ft) Flow Area (sq ft) 262.29
E.G. Slope (ft/ft) 0.000041 Area (sq ft) 262.29
Q Total (cfs) 133.00 Flow (cfs) 133.00
Top Width (ft) 100.00 Top Width (ft) 100.00
Vel Total (ft/s) 0.51 Avg. Vel. (ft/s) 0.51
Max Chl Dpth (ft) 3.50 Hydr. Depth (ft) 2.62
Conv. Total (cfs) 20771.9 Conv. (cfs) 20771.9
Length Wtd. (ft) 100.00 Wetted Per. (ft) 102.95
Min Ch El (ft) 111.33 Shear (lb/sq ft) 0.01
Alpha 1.00 Stream Power (lb/ft s) 819.24 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 23.38 19.94 34.35
C & E Loss (ft) 0.00 Cum SA (acres) 3.39 4.08 5.19
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 4098 Profile: PF 1
E.G. Elev (ft) 114.83 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.035
W.S. Elev (ft) 114.83 Reach Len. (ft) 78.40 98.84 117.59
Crit W.S. (ft) Flow Area (sq ft) 294.37
E.G. Slope (ft/ft) 0.000028 Area (sq ft) 294.37
Q Total (cfs) 133.00 Flow (cfs) 133.00
Top Width (ft) 100.00 Top Width (ft) 100.00
Vel Total (ft/s) 0.45 Avg. Vel. (ft/s) 0.45
Max Chl Dpth (ft) 3.83 Hydr. Depth (ft) 2.94
Conv. Total (cfs) 25105.5 Conv. (cfs) 25105.5
Length Wtd. (ft) 98.84 Wetted Per. (ft) 103.39
Min Ch El (ft) 111.00 Shear (lb/sq ft) 0.00
Alpha 1.00 Stream Power (lb/ft s) 1188.96 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 23.38 19.30 34.35
C & E Loss (ft) 0.00 Cum SA (acres) 3.39 3.85 5.19
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3999 Profile: PF 1
E.G. Elev (ft) 114.83 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.035
W.S. Elev (ft) 114.82 Reach Len. (ft) 199.91 201.68 215.46
Crit W.S. (ft) Flow Area (sq ft) 328.75
E.G. Slope (ft/ft) 0.000038 Area (sq ft) 328.75
Q Total (cfs) 185.00 Flow (cfs) 185.00
Top Width (ft) 100.00 Top Width (ft) 100.00
Vel Total (ft/s) 0.56 Avg. Vel. (ft/s) 0.56
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3999 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 4.16 Hydr. Depth (ft) 3.29
Conv. Total (cfs) 29979.9 Conv. (cfs) 29979.9
Length Wtd. (ft) 203.06 Wetted Per. (ft) 104.42
Min Ch El (ft) 110.66 Shear (lb/sq ft) 0.01
Alpha 1.00 Stream Power (lb/ft s) 886.21 0.00 0.00
Frctn Loss (ft) 0.02 Cum Volume (acre-ft) 23.38 18.60 34.35
C & E Loss (ft) 0.01 Cum SA (acres) 3.39 3.62 5.19
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3797 Profile: PF 1
E.G. Elev (ft) 114.79 Element Left OB Channel Right OB
Vel Head (ft) 0.05 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 114.74 Reach Len. (ft) 96.00 98.74 97.45
Crit W.S. (ft) 112.31 Flow Area (sq ft) 0.42 78.80 21.89
E.G. Slope (ft/ft) 0.002421 Area (sq ft) 0.42 78.80 21.89
Q Total (cfs) 185.00 Flow (cfs) 0.33 147.63 37.04
Top Width (ft) 53.14 Top Width (ft) 1.21 30.07 21.86
Vel Total (ft/s) 1.83 Avg. Vel. (ft/s) 0.80 1.87 1.69
Max Chl Dpth (ft) 5.25 Hydr. Depth (ft) 0.35 2.62 1.00
Conv. Total (cfs) 3759.6 Conv. (cfs) 6.8 3000.0 752.8
Length Wtd. (ft) 98.33 Wetted Per. (ft) 1.39 32.11 23.69
Min Ch El (ft) 109.49 Shear (lb/sq ft) 0.05 0.37 0.14
Alpha 1.01 Stream Power (lb/ft s) 702.81 0.00 128.46
Frctn Loss (ft) 0.30 Cum Volume (acre-ft) 23.38 17.65 34.30
C & E Loss (ft) 0.01 Cum SA (acres) 3.39 3.32 5.14
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3698 Profile: PF 1
E.G. Elev (ft) 114.49 Element Left OB Channel Right OB
Vel Head (ft) 0.10 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 114.39 Reach Len. (ft) 109.43 103.78 95.80
Crit W.S. (ft) 112.53 Flow Area (sq ft) 0.03 92.73 47.76
E.G. Slope (ft/ft) 0.003465 Area (sq ft) 0.03 92.73 47.76
Q Total (cfs) 344.00 Flow (cfs) 0.01 213.22 130.77
Top Width (ft) 65.36 Top Width (ft) 0.35 34.22 30.79
Vel Total (ft/s) 2.45 Avg. Vel. (ft/s) 0.41 2.30 2.74
Max Chl Dpth (ft) 5.55 Hydr. Depth (ft) 0.10 2.71 1.55
Conv. Total (cfs) 5844.1 Conv. (cfs) 0.2 3622.3 2221.6
Length Wtd. (ft) 100.10 Wetted Per. (ft) 0.40 36.37 32.84
Min Ch El (ft) 108.84 Shear (lb/sq ft) 0.02 0.55 0.31
Alpha 1.02 Stream Power (lb/ft s) 757.39 0.00 146.62
Frctn Loss (ft) 0.22 Cum Volume (acre-ft) 23.37 17.46 34.22
C & E Loss (ft) 0.01 Cum SA (acres) 3.39 3.25 5.08
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3595 Profile: PF 1
E.G. Elev (ft) 114.26 Element Left OB Channel Right OB
Vel Head (ft) 0.05 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 114.20 Reach Len. (ft) 95.68 94.63 94.00
Crit W.S. (ft) 111.77 Flow Area (sq ft) 0.86 110.15 86.01
E.G. Slope (ft/ft) 0.001471 Area (sq ft) 0.86 110.15 86.01
Q Total (cfs) 344.00 Flow (cfs) 0.40 156.64 186.96
Top Width (ft) 90.20 Top Width (ft) 4.36 44.26 41.58
Vel Total (ft/s) 1.75 Avg. Vel. (ft/s) 0.47 1.42 2.17
Max Chl Dpth (ft) 6.17 Hydr. Depth (ft) 0.20 2.49 2.07
Conv. Total (cfs) 8969.0 Conv. (cfs) 10.5 4084.1 4874.4
Length Wtd. (ft) 94.46 Wetted Per. (ft) 4.38 46.71 43.99
Min Ch El (ft) 108.03 Shear (lb/sq ft) 0.02 0.22 0.18
Alpha 1.14 Stream Power (lb/ft s) 872.08 0.00 182.66
Frctn Loss (ft) 0.29 Cum Volume (acre-ft) 23.37 17.22 34.07
C & E Loss (ft) 0.02 Cum SA (acres) 3.38 3.15 5.00
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3500 Profile: PF 1
E.G. Elev (ft) 113.95 Element Left OB Channel Right OB
Vel Head (ft) 0.21 Wt. n-Val. 0.071
W.S. Elev (ft) 113.73 Reach Len. (ft) 99.71 100.69 101.89
Crit W.S. (ft) 111.65 Flow Area (sq ft) 92.66
E.G. Slope (ft/ft) 0.010425 Area (sq ft) 92.66
Q Total (cfs) 344.00 Flow (cfs) 344.00
Top Width (ft) 37.83 Top Width (ft) 37.83
Vel Total (ft/s) 3.71 Avg. Vel. (ft/s) 3.71
Max Chl Dpth (ft) 5.86 Hydr. Depth (ft) 2.45
Conv. Total (cfs) 3369.2 Conv. (cfs) 3369.2
Length Wtd. (ft) 101.01 Wetted Per. (ft) 40.46
Min Ch El (ft) 107.87 Shear (lb/sq ft) 1.49
Alpha 1.00 Stream Power (lb/ft s) 1754.14 0.00 207.01
Frctn Loss (ft) 0.50 Cum Volume (acre-ft) 23.37 17.00 33.98
C & E Loss (ft) 0.04 Cum SA (acres) 3.38 3.06 4.95
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3399 Profile: PF 1
E.G. Elev (ft) 113.41 Element Left OB Channel Right OB
Vel Head (ft) 0.08 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 113.33 Reach Len. (ft) 100.06 99.37 98.97
Crit W.S. (ft) 111.60 Flow Area (sq ft) 0.03 90.62 79.31
E.G. Slope (ft/ft) 0.003008 Area (sq ft) 0.03 90.62 79.31
Q Total (cfs) 376.00 Flow (cfs) 0.01 184.28 191.71
Top Width (ft) 94.28 Top Width (ft) 0.82 35.91 57.55
Vel Total (ft/s) 2.21 Avg. Vel. (ft/s) 0.21 2.03 2.42
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3399 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 5.70 Hydr. Depth (ft) 0.03 2.52 1.38
Conv. Total (cfs) 6855.9 Conv. (cfs) 0.1 3360.1 3495.7
Length Wtd. (ft) 99.19 Wetted Per. (ft) 0.83 38.42 59.13
Min Ch El (ft) 107.63 Shear (lb/sq ft) 0.01 0.44 0.25
Alpha 1.02 Stream Power (lb/ft s) 1728.69 0.00 269.12
Frctn Loss (ft) 0.31 Cum Volume (acre-ft) 23.37 16.78 33.88
C & E Loss (ft) 0.00 Cum SA (acres) 3.38 2.98 4.89
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3300 Profile: PF 1
E.G. Elev (ft) 113.09 Element Left OB Channel Right OB
Vel Head (ft) 0.09 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 113.00 Reach Len. (ft) 107.12 99.93 93.38
Crit W.S. (ft) 111.04 Flow Area (sq ft) 0.61 110.52 52.08
E.G. Slope (ft/ft) 0.003347 Area (sq ft) 0.61 110.52 52.08
Q Total (cfs) 376.00 Flow (cfs) 0.39 225.14 150.48
Top Width (ft) 82.13 Top Width (ft) 3.57 48.56 30.00
Vel Total (ft/s) 2.30 Avg. Vel. (ft/s) 0.64 2.04 2.89
Max Chl Dpth (ft) 5.89 Hydr. Depth (ft) 0.17 2.28 1.74
Conv. Total (cfs) 6499.1 Conv. (cfs) 6.7 3891.4 2601.0
Length Wtd. (ft) 98.01 Wetted Per. (ft) 3.58 50.64 32.20
Min Ch El (ft) 107.11 Shear (lb/sq ft) 0.04 0.46 0.34
Alpha 1.10 Stream Power (lb/ft s) 1785.06 0.00 396.26
Frctn Loss (ft) 0.25 Cum Volume (acre-ft) 23.37 16.56 33.74
C & E Loss (ft) 0.01 Cum SA (acres) 3.37 2.88 4.79
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3200 Profile: PF 1
E.G. Elev (ft) 112.84 Element Left OB Channel Right OB
Vel Head (ft) 0.07 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 112.77 Reach Len. (ft) 151.18 149.52 148.62
Crit W.S. (ft) 111.80 Flow Area (sq ft) 48.97 70.30 81.50
E.G. Slope (ft/ft) 0.002033 Area (sq ft) 48.97 70.30 81.50
Q Total (cfs) 424.00 Flow (cfs) 90.44 150.34 183.22
Top Width (ft) 106.16 Top Width (ft) 39.95 18.21 48.00
Vel Total (ft/s) 2.11 Avg. Vel. (ft/s) 1.85 2.14 2.25
Max Chl Dpth (ft) 5.70 Hydr. Depth (ft) 1.23 3.86 1.70
Conv. Total (cfs) 9403.8 Conv. (cfs) 2005.7 3334.5 4063.6
Length Wtd. (ft) 149.72 Wetted Per. (ft) 40.77 20.61 50.50
Min Ch El (ft) 107.07 Shear (lb/sq ft) 0.15 0.43 0.20
Alpha 1.02 Stream Power (lb/ft s) 1782.36 0.00 455.26
Frctn Loss (ft) 0.23 Cum Volume (acre-ft) 23.31 16.35 33.59
C & E Loss (ft) 0.01 Cum SA (acres) 3.32 2.81 4.70
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 3050 Profile: PF 1
E.G. Elev (ft) 112.60 Element Left OB Channel Right OB
Vel Head (ft) 0.05 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 112.55 Reach Len. (ft) 102.96 128.25 152.52
Crit W.S. (ft) 110.03 Flow Area (sq ft) 72.45 127.48 40.50
E.G. Slope (ft/ft) 0.001195 Area (sq ft) 72.45 127.48 40.50
Q Total (cfs) 424.00 Flow (cfs) 145.22 217.69 61.09
Top Width (ft) 95.37 Top Width (ft) 33.51 33.26 28.60
Vel Total (ft/s) 1.76 Avg. Vel. (ft/s) 2.00 1.71 1.51
Max Chl Dpth (ft) 6.33 Hydr. Depth (ft) 2.16 3.83 1.42
Conv. Total (cfs) 12263.7 Conv. (cfs) 4200.3 6296.5 1766.9
Length Wtd. (ft) 127.35 Wetted Per. (ft) 35.80 35.16 30.67
Min Ch El (ft) 106.22 Shear (lb/sq ft) 0.15 0.27 0.10
Alpha 1.03 Stream Power (lb/ft s) 1915.52 0.00 540.87
Frctn Loss (ft) 0.22 Cum Volume (acre-ft) 23.10 16.01 33.38
C & E Loss (ft) 0.00 Cum SA (acres) 3.19 2.72 4.57
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2922 Profile: PF 1
E.G. Elev (ft) 112.38 Element Left OB Channel Right OB
Vel Head (ft) 0.08 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 112.31 Reach Len. (ft) 65.18 70.74 75.22
Crit W.S. (ft) 109.70 Flow Area (sq ft) 25.18 122.83 48.06
E.G. Slope (ft/ft) 0.002603 Area (sq ft) 25.18 122.83 48.06
Q Total (cfs) 424.00 Flow (cfs) 38.34 286.97 98.69
Top Width (ft) 108.45 Top Width (ft) 33.66 35.81 38.98
Vel Total (ft/s) 2.16 Avg. Vel. (ft/s) 1.52 2.34 2.05
Max Chl Dpth (ft) 6.33 Hydr. Depth (ft) 0.75 3.43 1.23
Conv. Total (cfs) 8310.1 Conv. (cfs) 751.4 5624.5 1934.2
Length Wtd. (ft) 70.74 Wetted Per. (ft) 33.71 37.95 41.06
Min Ch El (ft) 105.98 Shear (lb/sq ft) 0.12 0.53 0.19
Alpha 1.04 Stream Power (lb/ft s) 1612.78 0.00 188.42
Frctn Loss (ft) Cum Volume (acre-ft) 22.98 15.64 33.23
C & E Loss (ft) Cum SA (acres) 3.11 2.62 4.45
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2851 Profile: PF 1
E.G. Elev (ft) 112.33 Element Left OB Channel Right OB
Vel Head (ft) 0.06 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 112.27 Reach Len. (ft) 151.83 151.59 151.54
Crit W.S. (ft) 109.77 Flow Area (sq ft) 59.34 105.44 58.27
E.G. Slope (ft/ft) 0.001463 Area (sq ft) 59.34 105.44 58.27
Q Total (cfs) 424.00 Flow (cfs) 104.07 212.30 107.63
Top Width (ft) 101.44 Top Width (ft) 41.61 24.05 35.78
Vel Total (ft/s) 1.90 Avg. Vel. (ft/s) 1.75 2.01 1.85
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2851 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 6.38 Hydr. Depth (ft) 1.43 4.38 1.63
Conv. Total (cfs) 11083.4 Conv. (cfs) 2720.3 5549.6 2813.5
Length Wtd. (ft) 151.61 Wetted Per. (ft) 41.71 26.44 37.89
Min Ch El (ft) 105.89 Shear (lb/sq ft) 0.13 0.36 0.14
Alpha 1.01 Stream Power (lb/ft s) 1568.63 0.00 167.96
Frctn Loss (ft) 0.35 Cum Volume (acre-ft) 22.98 15.40 33.23
C & E Loss (ft) 0.02 Cum SA (acres) 3.06 2.57 4.39
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2700 Profile: PF 1
E.G. Elev (ft) 111.96 Element Left OB Channel Right OB
Vel Head (ft) 0.12 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 111.85 Reach Len. (ft) 111.49 108.17 105.42
Crit W.S. (ft) 109.28 Flow Area (sq ft) 0.90 125.19 28.74
E.G. Slope (ft/ft) 0.004125 Area (sq ft) 0.90 125.19 28.74
Q Total (cfs) 424.00 Flow (cfs) 0.88 340.80 82.33
Top Width (ft) 62.99 Top Width (ft) 3.25 40.79 18.95
Vel Total (ft/s) 2.74 Avg. Vel. (ft/s) 0.98 2.72 2.86
Max Chl Dpth (ft) 6.19 Hydr. Depth (ft) 0.28 3.07 1.52
Conv. Total (cfs) 6601.9 Conv. (cfs) 13.7 5306.4 1281.9
Length Wtd. (ft) 107.92 Wetted Per. (ft) 3.31 43.44 21.05
Min Ch El (ft) 105.66 Shear (lb/sq ft) 0.07 0.74 0.35
Alpha 1.01 Stream Power (lb/ft s) 1445.16 0.00 165.87
Frctn Loss (ft) 0.59 Cum Volume (acre-ft) 22.88 15.00 33.08
C & E Loss (ft) 0.01 Cum SA (acres) 2.98 2.45 4.30
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2592 Profile: PF 1
E.G. Elev (ft) 111.36 Element Left OB Channel Right OB
Vel Head (ft) 0.26 Wt. n-Val. 0.041 0.071
W.S. Elev (ft) 111.10 Reach Len. (ft) 87.93 91.99 96.49
Crit W.S. (ft) 108.85 Flow Area (sq ft) 1.76 103.69
E.G. Slope (ft/ft) 0.007668 Area (sq ft) 1.76 103.69
Q Total (cfs) 424.00 Flow (cfs) 2.18 421.82
Top Width (ft) 35.79 Top Width (ft) 7.13 28.66
Vel Total (ft/s) 4.02 Avg. Vel. (ft/s) 1.24 4.07
Max Chl Dpth (ft) 6.02 Hydr. Depth (ft) 0.25 3.62
Conv. Total (cfs) 4842.0 Conv. (cfs) 24.9 4817.1
Length Wtd. (ft) 91.98 Wetted Per. (ft) 7.25 31.36
Min Ch El (ft) 105.08 Shear (lb/sq ft) 0.12 1.58
Alpha 1.02 Stream Power (lb/ft s) 1334.77 0.00 188.04
Frctn Loss (ft) 0.97 Cum Volume (acre-ft) 22.88 14.71 33.04
C & E Loss (ft) 0.02 Cum SA (acres) 2.97 2.37 4.27
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2500 Profile: PF 1
E.G. Elev (ft) 110.37 Element Left OB Channel Right OB
Vel Head (ft) 0.45 Wt. n-Val. 0.071
W.S. Elev (ft) 109.91 Reach Len. (ft) 112.88 103.15 93.96
Crit W.S. (ft) 108.41 Flow Area (sq ft) 78.42
E.G. Slope (ft/ft) 0.015376 Area (sq ft) 78.42
Q Total (cfs) 424.00 Flow (cfs) 424.00
Top Width (ft) 23.10 Top Width (ft) 23.10
Vel Total (ft/s) 5.41 Avg. Vel. (ft/s) 5.41
Max Chl Dpth (ft) 5.32 Hydr. Depth (ft) 3.40
Conv. Total (cfs) 3419.4 Conv. (cfs) 3419.4
Length Wtd. (ft) 101.63 Wetted Per. (ft) 26.08
Min Ch El (ft) 104.59 Shear (lb/sq ft) 2.89
Alpha 1.00 Stream Power (lb/ft s) 1184.42 0.00 122.38
Frctn Loss (ft) 0.99 Cum Volume (acre-ft) 22.87 14.52 33.04
C & E Loss (ft) 0.08 Cum SA (acres) 2.96 2.31 4.27
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2397 Profile: PF 1
E.G. Elev (ft) 109.29 Element Left OB Channel Right OB
Vel Head (ft) 0.19 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 109.11 Reach Len. (ft) 107.26 99.62 92.59
Crit W.S. (ft) 107.09 Flow Area (sq ft) 0.28 113.48 59.36
E.G. Slope (ft/ft) 0.007435 Area (sq ft) 0.28 113.48 59.36
Q Total (cfs) 587.00 Flow (cfs) 0.17 418.89 167.93
Top Width (ft) 106.13 Top Width (ft) 3.17 35.49 67.47
Vel Total (ft/s) 3.39 Avg. Vel. (ft/s) 0.62 3.69 2.83
Max Chl Dpth (ft) 6.08 Hydr. Depth (ft) 0.09 3.20 0.88
Conv. Total (cfs) 6807.8 Conv. (cfs) 2.0 4858.1 1947.6
Length Wtd. (ft) 98.62 Wetted Per. (ft) 3.17 38.79 68.91
Min Ch El (ft) 103.03 Shear (lb/sq ft) 0.04 1.36 0.40
Alpha 1.04 Stream Power (lb/ft s) 893.84 0.00 145.80
Frctn Loss (ft) 0.76 Cum Volume (acre-ft) 22.87 14.29 32.98
C & E Loss (ft) 0.01 Cum SA (acres) 2.95 2.24 4.20
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2297 Profile: PF 1
E.G. Elev (ft) 108.53 Element Left OB Channel Right OB
Vel Head (ft) 0.27 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 108.26 Reach Len. (ft) 111.53 96.82 81.90
Crit W.S. (ft) 105.79 Flow Area (sq ft) 0.96 140.68 0.03
E.G. Slope (ft/ft) 0.007893 Area (sq ft) 0.96 140.68 0.03
Q Total (cfs) 587.00 Flow (cfs) 0.90 586.08 0.02
Top Width (ft) 45.79 Top Width (ft) 6.15 39.28 0.36
Vel Total (ft/s) 4.14 Avg. Vel. (ft/s) 0.93 4.17 0.60
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2297 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 6.19 Hydr. Depth (ft) 0.16 3.58 0.09
Conv. Total (cfs) 6607.3 Conv. (cfs) 10.1 6597.0 0.2
Length Wtd. (ft) 96.85 Wetted Per. (ft) 6.16 41.94 0.41
Min Ch El (ft) 102.07 Shear (lb/sq ft) 0.08 1.65 0.04
Alpha 1.01 Stream Power (lb/ft s) 853.62 0.00 170.39
Frctn Loss (ft) 0.80 Cum Volume (acre-ft) 22.87 14.00 32.92
C & E Loss (ft) 0.00 Cum SA (acres) 2.94 2.16 4.13
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2200 Profile: PF 1
E.G. Elev (ft) 107.73 Element Left OB Channel Right OB
Vel Head (ft) 0.28 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 107.45 Reach Len. (ft) 101.79 102.61 104.00
Crit W.S. (ft) 105.14 Flow Area (sq ft) 1.24 137.48 0.16
E.G. Slope (ft/ft) 0.008703 Area (sq ft) 1.24 137.48 0.16
Q Total (cfs) 587.00 Flow (cfs) 1.30 585.53 0.17
Top Width (ft) 48.14 Top Width (ft) 7.17 40.22 0.75
Vel Total (ft/s) 4.23 Avg. Vel. (ft/s) 1.05 4.26 1.09
Max Chl Dpth (ft) 6.04 Hydr. Depth (ft) 0.17 3.42 0.21
Conv. Total (cfs) 6292.3 Conv. (cfs) 14.0 6276.5 1.8
Length Wtd. (ft) 102.61 Wetted Per. (ft) 7.18 42.67 0.86
Min Ch El (ft) 101.41 Shear (lb/sq ft) 0.09 1.75 0.10
Alpha 1.01 Stream Power (lb/ft s) 884.33 0.00 161.40
Frctn Loss (ft) 0.74 Cum Volume (acre-ft) 22.87 13.69 32.92
C & E Loss (ft) 0.01 Cum SA (acres) 2.93 2.07 4.13
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2097 Profile: PF 1
E.G. Elev (ft) 106.98 Element Left OB Channel Right OB
Vel Head (ft) 0.24 Wt. n-Val. 0.071
W.S. Elev (ft) 106.74 Reach Len. (ft) 95.92 96.95 97.50
Crit W.S. (ft) 104.17 Flow Area (sq ft) 153.53
E.G. Slope (ft/ft) 0.006062 Area (sq ft) 153.53
Q Total (cfs) 604.00 Flow (cfs) 604.00
Top Width (ft) 36.99 Top Width (ft) 36.99
Vel Total (ft/s) 3.93 Avg. Vel. (ft/s) 3.93
Max Chl Dpth (ft) 5.97 Hydr. Depth (ft) 4.15
Conv. Total (cfs) 7757.5 Conv. (cfs) 7757.5
Length Wtd. (ft) 96.95 Wetted Per. (ft) 40.93
Min Ch El (ft) 100.77 Shear (lb/sq ft) 1.42
Alpha 1.00 Stream Power (lb/ft s) 948.26 0.00 168.34
Frctn Loss (ft) 0.61 Cum Volume (acre-ft) 22.87 13.35 32.92
C & E Loss (ft) 0.00 Cum SA (acres) 2.92 1.98 4.13
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 2001 Profile: PF 1
E.G. Elev (ft) 106.37 Element Left OB Channel Right OB
Vel Head (ft) 0.25 Wt. n-Val. 0.071
W.S. Elev (ft) 106.11 Reach Len. (ft) 83.50 100.51 119.37
Crit W.S. (ft) Flow Area (sq ft) 149.60
E.G. Slope (ft/ft) 0.006532 Area (sq ft) 149.60
Q Total (cfs) 604.00 Flow (cfs) 604.00
Top Width (ft) 38.07 Top Width (ft) 38.07
Vel Total (ft/s) 4.04 Avg. Vel. (ft/s) 4.04
Max Chl Dpth (ft) 5.95 Hydr. Depth (ft) 3.93
Conv. Total (cfs) 7473.5 Conv. (cfs) 7473.5
Length Wtd. (ft) 100.51 Wetted Per. (ft) 40.57
Min Ch El (ft) 100.16 Shear (lb/sq ft) 1.50
Alpha 1.00 Stream Power (lb/ft s) 1033.45 0.00 0.00
Frctn Loss (ft) 0.70 Cum Volume (acre-ft) 22.87 13.01 32.92
C & E Loss (ft) 0.00 Cum SA (acres) 2.92 1.90 4.13
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1900 Profile: PF 1
E.G. Elev (ft) 105.66 Element Left OB Channel Right OB
Vel Head (ft) 0.26 Wt. n-Val. 0.000 0.071
W.S. Elev (ft) 105.40 Reach Len. (ft) 97.63 99.67 102.56
Crit W.S. (ft) Flow Area (sq ft) 0.00 147.59
E.G. Slope (ft/ft) 0.007542 Area (sq ft) 0.00 147.59
Q Total (cfs) 604.00 Flow (cfs) 0.00 604.00
Top Width (ft) 41.29 Top Width (ft) 0.05 41.24
Vel Total (ft/s) 4.09 Avg. Vel. (ft/s) 0.19 4.09
Max Chl Dpth (ft) 5.82 Hydr. Depth (ft) 0.02 3.58
Conv. Total (cfs) 6954.8 Conv. (cfs) 0.0 6954.8
Length Wtd. (ft) 99.67 Wetted Per. (ft) 0.06 43.68
Min Ch El (ft) 99.58 Shear (lb/sq ft) 1.59
Alpha 1.00 Stream Power (lb/ft s) 888.76 0.00 0.00
Frctn Loss (ft) 0.82 Cum Volume (acre-ft) 22.87 12.67 32.92
C & E Loss (ft) 0.00 Cum SA (acres) 2.92 1.80 4.13
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1800 Profile: PF 1
E.G. Elev (ft) 104.84 Element Left OB Channel Right OB
Vel Head (ft) 0.28 Wt. n-Val. 0.071
W.S. Elev (ft) 104.57 Reach Len. (ft) 112.21 100.09 84.81
Crit W.S. (ft) Flow Area (sq ft) 147.13
E.G. Slope (ft/ft) 0.008932 Area (sq ft) 147.13
Q Total (cfs) 621.00 Flow (cfs) 621.00
Top Width (ft) 44.46 Top Width (ft) 44.46
Vel Total (ft/s) 4.22 Avg. Vel. (ft/s) 4.22
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1800 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 5.50 Hydr. Depth (ft) 3.31
Conv. Total (cfs) 6570.8 Conv. (cfs) 6570.8
Length Wtd. (ft) 99.58 Wetted Per. (ft) 47.20
Min Ch El (ft) 99.07 Shear (lb/sq ft) 1.74
Alpha 1.00 Stream Power (lb/ft s) 870.54 0.00 0.00
Frctn Loss (ft) 0.69 Cum Volume (acre-ft) 22.87 12.33 32.92
C & E Loss (ft) 0.03 Cum SA (acres) 2.92 1.71 4.13
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1700 Profile: PF 1
E.G. Elev (ft) 104.13 Element Left OB Channel Right OB
Vel Head (ft) 0.19 Wt. n-Val. 0.071 0.041
W.S. Elev (ft) 103.93 Reach Len. (ft) 98.49 100.14 102.38
Crit W.S. (ft) Flow Area (sq ft) 162.87 15.54
E.G. Slope (ft/ft) 0.005521 Area (sq ft) 162.87 15.54
Q Total (cfs) 621.00 Flow (cfs) 579.32 41.68
Top Width (ft) 60.91 Top Width (ft) 45.42 15.49
Vel Total (ft/s) 3.48 Avg. Vel. (ft/s) 3.56 2.68
Max Chl Dpth (ft) 5.45 Hydr. Depth (ft) 3.59 1.00
Conv. Total (cfs) 8357.4 Conv. (cfs) 7796.4 561.0
Length Wtd. (ft) 100.22 Wetted Per. (ft) 47.08 15.62
Min Ch El (ft) 98.48 Shear (lb/sq ft) 1.19 0.34
Alpha 1.01 Stream Power (lb/ft s) 808.17 0.00 0.00
Frctn Loss (ft) 0.46 Cum Volume (acre-ft) 22.87 11.98 32.90
C & E Loss (ft) 0.02 Cum SA (acres) 2.92 1.60 4.11
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1600 Profile: PF 1
E.G. Elev (ft) 103.64 Element Left OB Channel Right OB
Vel Head (ft) 0.12 Wt. n-Val. 0.071
W.S. Elev (ft) 103.52 Reach Len. (ft) 92.18 101.35 111.39
Crit W.S. (ft) Flow Area (sq ft) 223.91
E.G. Slope (ft/ft) 0.003896 Area (sq ft) 223.91
Q Total (cfs) 621.00 Flow (cfs) 621.00
Top Width (ft) 69.85 Top Width (ft) 69.85
Vel Total (ft/s) 2.77 Avg. Vel. (ft/s) 2.77
Max Chl Dpth (ft) 5.76 Hydr. Depth (ft) 3.21
Conv. Total (cfs) 9949.7 Conv. (cfs) 9949.7
Length Wtd. (ft) 101.26 Wetted Per. (ft) 72.37
Min Ch El (ft) 97.76 Shear (lb/sq ft) 0.75
Alpha 1.00 Stream Power (lb/ft s) 847.50 0.00 0.00
Frctn Loss (ft) 0.32 Cum Volume (acre-ft) 22.87 11.53 32.88
C & E Loss (ft) 0.01 Cum SA (acres) 2.92 1.47 4.09
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1499 Profile: PF 1
E.G. Elev (ft) 103.31 Element Left OB Channel Right OB
Vel Head (ft) 0.10 Wt. n-Val. 0.041 0.071
W.S. Elev (ft) 103.21 Reach Len. (ft) 100.38 99.53 100.49
Crit W.S. (ft) Flow Area (sq ft) 11.17 237.77
E.G. Slope (ft/ft) 0.002657 Area (sq ft) 11.17 237.77
Q Total (cfs) 621.00 Flow (cfs) 12.61 608.39
Top Width (ft) 84.99 Top Width (ft) 23.44 61.55
Vel Total (ft/s) 2.49 Avg. Vel. (ft/s) 1.13 2.56
Max Chl Dpth (ft) 6.39 Hydr. Depth (ft) 0.48 3.86
Conv. Total (cfs) 12047.5 Conv. (cfs) 244.6 11803.0
Length Wtd. (ft) 99.58 Wetted Per. (ft) 23.81 65.09
Min Ch El (ft) 96.82 Shear (lb/sq ft) 0.08 0.61
Alpha 1.03 Stream Power (lb/ft s) 899.13 0.00 0.00
Frctn Loss (ft) 0.24 Cum Volume (acre-ft) 22.86 11.00 32.88
C & E Loss (ft) 0.00 Cum SA (acres) 2.89 1.32 4.09
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1399 Profile: PF 1
E.G. Elev (ft) 103.07 Element Left OB Channel Right OB
Vel Head (ft) 0.12 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.95 Reach Len. (ft) 100.17 100.52 101.00
Crit W.S. (ft) Flow Area (sq ft) 33.58 198.16 2.10
E.G. Slope (ft/ft) 0.002238 Area (sq ft) 33.58 198.16 2.10
Q Total (cfs) 621.00 Flow (cfs) 59.21 559.31 2.47
Top Width (ft) 71.77 Top Width (ft) 31.52 39.54 0.71
Vel Total (ft/s) 2.66 Avg. Vel. (ft/s) 1.76 2.82 1.18
Max Chl Dpth (ft) 7.06 Hydr. Depth (ft) 1.07 5.01 2.95
Conv. Total (cfs) 13127.4 Conv. (cfs) 1251.7 11823.4 52.3
Length Wtd. (ft) 100.45 Wetted Per. (ft) 32.20 41.16 3.67
Min Ch El (ft) 95.89 Shear (lb/sq ft) 0.15 0.67 0.08
Alpha 1.06 Stream Power (lb/ft s) 919.87 0.00 0.00
Frctn Loss (ft) 0.10 Cum Volume (acre-ft) 22.81 10.50 32.88
C & E Loss (ft) 0.02 Cum SA (acres) 2.83 1.20 4.09
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1299 Profile: PF 1
E.G. Elev (ft) 102.94 Element Left OB Channel Right OB
Vel Head (ft) 0.04 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.91 Reach Len. (ft) 91.61 99.84 106.94
Crit W.S. (ft) Flow Area (sq ft) 158.61 228.93 20.55
E.G. Slope (ft/ft) 0.000596 Area (sq ft) 158.61 228.93 20.55
Q Total (cfs) 621.00 Flow (cfs) 227.62 362.55 30.82
Top Width (ft) 121.70 Top Width (ft) 75.42 40.73 5.55
Vel Total (ft/s) 1.52 Avg. Vel. (ft/s) 1.44 1.58 1.50
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1299 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 7.39 Hydr. Depth (ft) 2.10 5.62 3.70
Conv. Total (cfs) 25432.1 Conv. (cfs) 9322.0 14847.8 1262.3
Length Wtd. (ft) 97.04 Wetted Per. (ft) 76.81 41.96 9.31
Min Ch El (ft) 95.52 Shear (lb/sq ft) 0.08 0.20 0.08
Alpha 1.01 Stream Power (lb/ft s) 891.84 0.00 0.00
Frctn Loss (ft) 0.04 Cum Volume (acre-ft) 22.58 10.01 32.85
C & E Loss (ft) 0.00 Cum SA (acres) 2.71 1.11 4.08
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1199 Profile: PF 1
E.G. Elev (ft) 102.90 Element Left OB Channel Right OB
Vel Head (ft) 0.02 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.88 Reach Len. (ft) 91.09 98.94 107.40
Crit W.S. (ft) Flow Area (sq ft) 228.96 269.93 45.79
E.G. Slope (ft/ft) 0.000255 Area (sq ft) 228.96 269.93 45.79
Q Total (cfs) 621.00 Flow (cfs) 269.96 294.97 56.07
Top Width (ft) 130.77 Top Width (ft) 75.61 44.76 10.40
Vel Total (ft/s) 1.14 Avg. Vel. (ft/s) 1.18 1.09 1.22
Max Chl Dpth (ft) 7.64 Hydr. Depth (ft) 3.03 6.03 4.40
Conv. Total (cfs) 38879.7 Conv. (cfs) 16901.7 18467.7 3510.3
Length Wtd. (ft) 97.02 Wetted Per. (ft) 78.76 45.67 14.89
Min Ch El (ft) 95.24 Shear (lb/sq ft) 0.05 0.09 0.05
Alpha 1.01 Stream Power (lb/ft s) 851.98 0.00 0.00
Frctn Loss (ft) 0.02 Cum Volume (acre-ft) 22.18 9.43 32.77
C & E Loss (ft) 0.00 Cum SA (acres) 2.55 1.01 4.06
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1100 Profile: PF 1
E.G. Elev (ft) 102.88 Element Left OB Channel Right OB
Vel Head (ft) 0.02 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.86 Reach Len. (ft) 100.24 99.86 99.71
Crit W.S. (ft) Flow Area (sq ft) 195.82 323.73 93.39
E.G. Slope (ft/ft) 0.000172 Area (sq ft) 195.82 323.73 93.39
Q Total (cfs) 621.00 Flow (cfs) 214.17 295.73 111.10
Top Width (ft) 123.09 Top Width (ft) 52.35 52.32 18.42
Vel Total (ft/s) 1.01 Avg. Vel. (ft/s) 1.09 0.91 1.19
Max Chl Dpth (ft) 7.89 Hydr. Depth (ft) 3.74 6.19 5.07
Conv. Total (cfs) 47358.7 Conv. (cfs) 16333.0 22552.6 8473.1
Length Wtd. (ft) 100.01 Wetted Per. (ft) 56.09 53.31 23.58
Min Ch El (ft) 94.97 Shear (lb/sq ft) 0.04 0.07 0.04
Alpha 1.04 Stream Power (lb/ft s) 788.49 0.00 0.00
Frctn Loss (ft) 0.01 Cum Volume (acre-ft) 21.73 8.76 32.60
C & E Loss (ft) 0.00 Cum SA (acres) 2.41 0.90 4.03
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 1000 Profile: PF 1
E.G. Elev (ft) 102.86 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.85 Reach Len. (ft) 99.16 99.52 99.72
Crit W.S. (ft) Flow Area (sq ft) 348.64 216.84 73.71
E.G. Slope (ft/ft) 0.000129 Area (sq ft) 348.64 216.84 73.71
Q Total (cfs) 621.00 Flow (cfs) 360.85 184.66 75.50
Top Width (ft) 127.72 Top Width (ft) 83.50 31.03 13.19
Vel Total (ft/s) 0.97 Avg. Vel. (ft/s) 1.03 0.85 1.02
Max Chl Dpth (ft) 8.49 Hydr. Depth (ft) 4.18 6.99 5.59
Conv. Total (cfs) 54583.5 Conv. (cfs) 31716.9 16230.5 6636.1
Length Wtd. (ft) 99.44 Wetted Per. (ft) 87.67 32.06 18.83
Min Ch El (ft) 94.36 Shear (lb/sq ft) 0.03 0.05 0.03
Alpha 1.02 Stream Power (lb/ft s) 747.96 0.00 0.00
Frctn Loss (ft) 0.02 Cum Volume (acre-ft) 21.11 8.14 32.41
C & E Loss (ft) 0.00 Cum SA (acres) 2.26 0.81 3.99
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 901 Profile: PF 1
E.G. Elev (ft) 102.85 Element Left OB Channel Right OB
Vel Head (ft) 0.03 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.82 Reach Len. (ft) 100.03 100.24 100.87
Crit W.S. (ft) Flow Area (sq ft) 94.20 214.88 194.96
E.G. Slope (ft/ft) 0.000182 Area (sq ft) 94.20 214.88 194.96
Q Total (cfs) 621.00 Flow (cfs) 115.67 224.19 281.13
Top Width (ft) 80.57 Top Width (ft) 19.02 29.13 32.42
Vel Total (ft/s) 1.23 Avg. Vel. (ft/s) 1.23 1.04 1.44
Max Chl Dpth (ft) 9.07 Hydr. Depth (ft) 4.95 7.38 6.01
Conv. Total (cfs) 46033.3 Conv. (cfs) 8574.6 16619.0 20839.6
Length Wtd. (ft) 100.53 Wetted Per. (ft) 23.67 30.25 38.49
Min Ch El (ft) 93.75 Shear (lb/sq ft) 0.05 0.08 0.06
Alpha 1.06 Stream Power (lb/ft s) 639.02 0.00 0.00
Frctn Loss (ft) 0.02 Cum Volume (acre-ft) 20.60 7.65 32.10
C & E Loss (ft) 0.00 Cum SA (acres) 2.14 0.74 3.94
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 800 Profile: PF 1
E.G. Elev (ft) 102.83 Element Left OB Channel Right OB
Vel Head (ft) 0.03 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.81 Reach Len. (ft) 147.04 119.01 85.12
Crit W.S. (ft) Flow Area (sq ft) 108.20 214.00 313.51
E.G. Slope (ft/ft) 0.000157 Area (sq ft) 108.20 214.00 313.51
Q Total (cfs) 793.00 Flow (cfs) 126.33 213.68 452.99
Top Width (ft) 97.87 Top Width (ft) 21.30 27.52 49.05
Vel Total (ft/s) 1.25 Avg. Vel. (ft/s) 1.17 1.00 1.44
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 800 Profile: PF 1 (Continued)
Max Chl Dpth (ft) 9.60 Hydr. Depth (ft) 5.08 7.78 6.39
Conv. Total (cfs) 63266.3 Conv. (cfs) 10078.9 17047.5 36140.0
Length Wtd. (ft) 106.82 Wetted Per. (ft) 26.26 28.82 55.27
Min Ch El (ft) 93.20 Shear (lb/sq ft) 0.04 0.07 0.06
Alpha 1.08 Stream Power (lb/ft s) 589.18 0.00 0.00
Frctn Loss (ft) 0.01 Cum Volume (acre-ft) 20.37 7.15 31.51
C & E Loss (ft) 0.00 Cum SA (acres) 2.09 0.67 3.85
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 681 Profile: PF 1
E.G. Elev (ft) 102.82 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.80 Reach Len. (ft) 21.00 21.00 21.00
Crit W.S. (ft) 96.30 Flow Area (sq ft) 140.83 417.07 316.68
E.G. Slope (ft/ft) 0.000086 Area (sq ft) 140.83 417.07 316.68
Q Total (cfs) 793.00 Flow (cfs) 129.83 333.69 329.48
Top Width (ft) 126.13 Top Width (ft) 26.32 48.77 51.04
Vel Total (ft/s) 0.91 Avg. Vel. (ft/s) 0.92 0.80 1.04
Max Chl Dpth (ft) 10.31 Hydr. Depth (ft) 5.35 8.55 6.20
Conv. Total (cfs) 85636.1 Conv. (cfs) 14020.5 36035.1 35580.4
Length Wtd. (ft) 21.00 Wetted Per. (ft) 30.93 49.72 58.02
Min Ch El (ft) 92.49 Shear (lb/sq ft) 0.02 0.04 0.03
Alpha 1.04 Stream Power (lb/ft s) 498.73 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 19.95 6.29 30.90
C & E Loss (ft) 0.00 Cum SA (acres) 2.01 0.57 3.75
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 660 BR U Profile: PF 1
E.G. Elev (ft) 102.81 Element Left OB Channel Right OB
Vel Head (ft) 0.03 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.78 Reach Len. (ft) 40.00 40.00 40.00
Crit W.S. (ft) 98.54 Flow Area (sq ft) 123.08 299.28 243.83
E.G. Slope (ft/ft) 0.000272 Area (sq ft) 123.08 299.28 243.83
Q Total (cfs) 793.00 Flow (cfs) 185.35 218.06 389.59
Top Width (ft) 126.13 Top Width (ft) 26.32 48.77 51.04
Vel Total (ft/s) 1.19 Avg. Vel. (ft/s) 1.51 0.73 1.60
Max Chl Dpth (ft) 10.29 Hydr. Depth (ft) 4.68 6.14 4.78
Conv. Total (cfs) 48066.6 Conv. (cfs) 11235.0 13217.3 23614.3
Length Wtd. (ft) 40.00 Wetted Per. (ft) 30.79 97.63 55.82
Min Ch El (ft) 92.49 Shear (lb/sq ft) 0.07 0.05 0.07
Alpha 1.36 Stream Power (lb/ft s) 498.73 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 19.89 6.12 30.76
C & E Loss (ft) 0.01 Cum SA (acres) 2.00 0.54 3.72
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 660 BR D Profile: PF 1
E.G. Elev (ft) 102.79 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.79 Reach Len. (ft) 29.41 29.41 29.41
Crit W.S. (ft) 95.35 Flow Area (sq ft) 1662.49 390.26 1579.33
E.G. Slope (ft/ft) 0.000005 Area (sq ft) 1662.49 390.26 1579.33
Q Total (cfs) 793.00 Flow (cfs) 394.17 41.09 357.74
Top Width (ft) 716.45 Top Width (ft) 324.14 62.68 329.63
Vel Total (ft/s) 0.22 Avg. Vel. (ft/s) 0.24 0.11 0.23
Max Chl Dpth (ft) 11.65 Hydr. Depth (ft) 5.13 6.23 4.79
Conv. Total (cfs) 357144.4 Conv. (cfs) 177522.6 18507.2 161114.5
Length Wtd. (ft) 29.41 Wetted Per. (ft) 328.73 114.41 334.42
Min Ch El (ft) 91.14 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.08 Stream Power (lb/ft s) 716.45 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 19.07 5.80 29.92
C & E Loss (ft) 0.00 Cum SA (acres) 1.84 0.49 3.55
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 591 Profile: PF 1
E.G. Elev (ft) 102.79 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.79 Reach Len. (ft) 80.47 90.54 97.98
Crit W.S. (ft) Flow Area (sq ft) 1810.86 549.14 2339.17
E.G. Slope (ft/ft) 0.000002 Area (sq ft) 1810.86 549.14 2339.17
Q Total (cfs) 793.00 Flow (cfs) 288.53 67.62 436.85
Top Width (ft) 716.45 Top Width (ft) 324.14 62.68 329.63
Vel Total (ft/s) 0.17 Avg. Vel. (ft/s) 0.16 0.12 0.19
Max Chl Dpth (ft) 11.65 Hydr. Depth (ft) 5.59 8.76 7.10
Conv. Total (cfs) 562583.1 Conv. (cfs) 204693.4 47970.9 309918.8
Length Wtd. (ft) 92.11 Wetted Per. (ft) 328.76 64.39 334.66
Min Ch El (ft) 91.14 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.04 Stream Power (lb/ft s) 716.45 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 17.89 5.49 28.60
C & E Loss (ft) 0.00 Cum SA (acres) 1.62 0.45 3.33
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 500 Profile: PF 1
E.G. Elev (ft) 102.79 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.79 Reach Len. (ft) 99.37 102.60 106.23
Crit W.S. (ft) Flow Area (sq ft) 993.44 403.59 2517.73
E.G. Slope (ft/ft) 0.000002 Area (sq ft) 993.44 403.59 2517.73
Q Total (cfs) 793.00 Flow (cfs) 190.15 57.54 545.32
Top Width (ft) 518.49 Top Width (ft) 150.00 42.65 325.84
Vel Total (ft/s) 0.20 Avg. Vel. (ft/s) 0.19 0.14 0.22
Max Chl Dpth (ft) 11.29 Hydr. Depth (ft) 6.62 9.46 7.73
Conv. Total (cfs) 514647.0 Conv. (cfs) 123403.4 37341.0 353902.7
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 500 Profile: PF 1 (Continued)
Length Wtd. (ft) 103.99 Wetted Per. (ft) 156.56 43.42 329.62
Min Ch El (ft) 91.50 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.04 Stream Power (lb/ft s) 518.49 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 15.30 4.50 23.14
C & E Loss (ft) 0.00 Cum SA (acres) 1.18 0.34 2.59
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 398 Profile: PF 1
E.G. Elev (ft) 102.79 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.79 Reach Len. (ft) 92.13 104.81 116.86
Crit W.S. (ft) Flow Area (sq ft) 1606.74 264.52 2400.69
E.G. Slope (ft/ft) 0.000002 Area (sq ft) 1606.74 264.52 2400.69
Q Total (cfs) 793.00 Flow (cfs) 279.14 34.60 479.26
Top Width (ft) 553.33 Top Width (ft) 237.07 26.47 289.79
Vel Total (ft/s) 0.19 Avg. Vel. (ft/s) 0.17 0.13 0.20
Max Chl Dpth (ft) 10.91 Hydr. Depth (ft) 6.78 9.99 8.28
Conv. Total (cfs) 581659.0 Conv. (cfs) 204747.1 25381.1 351530.8
Length Wtd. (ft) 108.38 Wetted Per. (ft) 243.70 26.95 295.61
Min Ch El (ft) 91.88 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.03 Stream Power (lb/ft s) 553.33 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 12.34 3.71 17.14
C & E Loss (ft) 0.00 Cum SA (acres) 0.74 0.26 1.84
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 293 Profile: PF 1
E.G. Elev (ft) 102.79 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.79 Reach Len. (ft) 18.00 18.00 18.00
Crit W.S. (ft) 94.39 Flow Area (sq ft) 959.18 390.39 2012.66
E.G. Slope (ft/ft) 0.000003 Area (sq ft) 959.18 390.39 2012.66
Q Total (cfs) 793.00 Flow (cfs) 217.26 62.53 513.21
Top Width (ft) 409.27 Top Width (ft) 131.95 40.69 236.63
Vel Total (ft/s) 0.24 Avg. Vel. (ft/s) 0.23 0.16 0.25
Max Chl Dpth (ft) 11.23 Hydr. Depth (ft) 7.27 9.59 8.51
Conv. Total (cfs) 460815.8 Conv. (cfs) 126248.9 36335.7 298231.2
Length Wtd. (ft) 18.00 Wetted Per. (ft) 138.59 41.63 243.45
Min Ch El (ft) 91.56 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.05 Stream Power (lb/ft s) 409.27 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 9.62 2.92 11.22
C & E Loss (ft) 0.00 Cum SA (acres) 0.35 0.18 1.13
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 275 BR U Profile: PF 1
E.G. Elev (ft) 102.79 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.79 Reach Len. (ft) 16.00 16.00 16.00
Crit W.S. (ft) 94.42 Flow Area (sq ft) 959.15 319.65 2009.71
E.G. Slope (ft/ft) 0.000003 Area (sq ft) 959.15 319.65 2009.71
Q Total (cfs) 793.00 Flow (cfs) 228.60 26.55 537.85
Top Width (ft) 409.27 Top Width (ft) 131.95 40.69 236.63
Vel Total (ft/s) 0.24 Avg. Vel. (ft/s) 0.24 0.08 0.27
Max Chl Dpth (ft) 11.23 Hydr. Depth (ft) 7.27 7.86 8.49
Conv. Total (cfs) 437927.1 Conv. (cfs) 126243.7 14662.5 297020.9
Length Wtd. (ft) 16.00 Wetted Per. (ft) 138.59 98.51 244.04
Min Ch El (ft) 91.56 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.12 Stream Power (lb/ft s) 409.27 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 9.23 2.77 10.39
C & E Loss (ft) 0.00 Cum SA (acres) 0.30 0.16 1.03
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 275 BR D Profile: PF 1
E.G. Elev (ft) 102.79 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.79 Reach Len. (ft) 57.88 57.88 57.88
Crit W.S. (ft) 94.55 Flow Area (sq ft) 649.09 394.44 1982.21
E.G. Slope (ft/ft) 0.000004 Area (sq ft) 649.09 394.44 1982.21
Q Total (cfs) 793.00 Flow (cfs) 170.89 46.15 575.95
Top Width (ft) 393.88 Top Width (ft) 90.39 48.87 254.62
Vel Total (ft/s) 0.26 Avg. Vel. (ft/s) 0.26 0.12 0.29
Max Chl Dpth (ft) 12.35 Hydr. Depth (ft) 7.18 8.07 7.79
Conv. Total (cfs) 387563.0 Conv. (cfs) 83520.0 22556.7 281486.3
Length Wtd. (ft) 57.88 Wetted Per. (ft) 97.03 87.33 255.57
Min Ch El (ft) 90.44 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.12 Stream Power (lb/ft s) 395.35 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 8.93 2.64 9.66
C & E Loss (ft) 0.00 Cum SA (acres) 0.26 0.15 0.94
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 201 Profile: PF 1
E.G. Elev (ft) 102.79 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.79 Reach Len. (ft) 99.96 101.61 103.71
Crit W.S. (ft) Flow Area (sq ft) 649.07 464.22 1982.36
E.G. Slope (ft/ft) 0.000004 Area (sq ft) 649.07 464.22 1982.36
Q Total (cfs) 793.00 Flow (cfs) 162.30 83.30 547.40
Top Width (ft) 393.88 Top Width (ft) 90.39 48.87 254.62
Vel Total (ft/s) 0.26 Avg. Vel. (ft/s) 0.25 0.18 0.28
Max Chl Dpth (ft) 12.35 Hydr. Depth (ft) 7.18 9.50 7.79
Conv. Total (cfs) 408073.0 Conv. (cfs) 83517.4 42866.3 281689.3
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 201 Profile: PF 1 (Continued)
Length Wtd. (ft) 103.03 Wetted Per. (ft) 97.03 50.09 255.34
Min Ch El (ft) 90.44 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.05 Stream Power (lb/ft s) 395.35 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 8.07 2.07 7.02
C & E Loss (ft) 0.00 Cum SA (acres) 0.14 0.08 0.61
Plan: PostObst Tank Farm Creek TankFarmCreek (2 RS: 99 Profile: PF 1
E.G. Elev (ft) 102.79 Element Left OB Channel Right OB
Vel Head (ft) 0.00 Wt. n-Val. 0.041 0.071 0.041
W.S. Elev (ft) 102.79 Reach Len. (ft) 99.00 99.00 99.00
Crit W.S. (ft) Flow Area (sq ft) 197.70 193.55 1976.14
E.G. Slope (ft/ft) 0.000006 Area (sq ft) 197.70 193.55 1976.14
Q Total (cfs) 793.00 Flow (cfs) 56.69 41.42 694.89
Top Width (ft) 302.76 Top Width (ft) 28.32 19.83 254.61
Vel Total (ft/s) 0.33 Avg. Vel. (ft/s) 0.29 0.21 0.35
Max Chl Dpth (ft) 12.59 Hydr. Depth (ft) 6.98 9.76 7.76
Conv. Total (cfs) 319519.1 Conv. (cfs) 22843.7 16688.4 279987.0
Length Wtd. (ft) 99.00 Wetted Per. (ft) 34.73 23.14 255.65
Min Ch El (ft) 90.20 Shear (lb/sq ft) 0.00 0.00 0.00
Alpha 1.04 Stream Power (lb/ft s) 304.20 0.00 0.00
Frctn Loss (ft) 0.00 Cum Volume (acre-ft) 7.10 1.31 2.31
C & E Loss (ft) 0.00 Cum SA (acres)
Drainage Report F1
Avila Ranch, Tentative Tract Map
Appendix F
Avocet Environmental Technical Memorandum
December 1, 2015 Project No. 1428.002
TO: John Rogers
Civil Senior Associate Engineer
CANNON
1050 Southwood Drive
San Luis Obispo, CA 93401
FROM: Greg Stone, P.E.
Technical Memorandum
Additional Hydrology Support
Avila Ranch Development
San Luis Obispo, California
Avocet Environmental, Inc. (Avocet) was directed to perform an additional hydrologic
evaluation in support of development activities at the Avila Ranch site (Figure 1). The
evaluation analyzes the variation of storm water discharge from the Chevron San Luis Obispo
Tank Farm (SLOTF) property immediately upstream of the project site. The analysis assumes
that restoration and infrastructure improvements on the SLOTF property are complete on the
southwestern portion of the property, south of Tank Farm Road (Figure 2).
METHODOLOGY
For this evaluation, a hydrologic model was constructed using Bentley Sewer Gems V8i by
modifying the models constructed for, and described in detail in, the San Luis Obispo Tank Farm
Hydrology Report. The model was isolated to an area of Tank Farm Creek south of Tank Farm
Road using the geometry of the post-restoration conditions. Inflows to the model were based
upon the results of the existing conditions hydrologic model for the SLOTF property.
RESULTS
Hydrographs were generated for each of the design storms (2-, 10-, 25-, 50-, and 100-year return
periods) for both the existing and post-restoration scenarios. A comparison of the peak flows is
presented in the table below. Hydrographs are provided in Attachment 1.
Technical Memorandum
Additional Hydrology Support
Avila Ranch Development Page 2
San Luis Obispo, California December 1, 2015
Peak Flow (cfs)
Scenario 2-Year 10-Year 25-Year 50-Year 100-Year
Existing Conditions Combined 60 81 229 377 469
Existing Conditions Discharge 60 81 84 85 86
Existing Conditions Overflow 0 0 145 292 383
Post Restoration Conditions Combined 45 76 163 252 392
Post Restoration Conditions Discharge 45 76 84 86 87
Post Restoration Conditions Overflow 0 0 79 166 305
Peak discharges from the site are similar in both the existing and post-restoration conditions,
particularly for the higher return period storms as the site discharge reaches capacity and
overtopping of the storm water detention pond begins. While both models experience overflow
of the detention pond in excess of the assumed discharge rate, the peak overflows in the post-
restoration model are significantly reduced from those in the existing conditions model.
CONCLUSION
In order to further reduce the peak storm water discharge from the SLOTF site, additional work
will need to be considered. Two potential options include the creation of additional storage (i.e.,
complete the northern SLOTF restoration work) or modification of the site discharge to increase
discharge flow and potentially eliminate any overflow of the detention pond.
P:\1428 Cannon Avila Ranch\Additional Hydrology Support\Report\TM-Additional Hydrology Support_2015-12-01.docx
Figures
SAN LUIS OBISPOCOUNTY AIRP ORT
TANK FARM ROAD
SOUTH HIGUERA STREETBUCKLEY ROADVACHELL LANEL
O
S O
S
O
S VA
LLE
Y R
O
A
D HWY 101S:\GIS\1425_Avila_Ranch\ArcDocuments\001_1428.001_Site_Location_Map.mxd\8/7/2015FIGURE 1
SITE LO CATION MAP
AVILA RANCHHYDROLOGY STUDY
PREPARED FORCANNONSAN LUIS OBISPO, CALIFORNIA
APPROXIMATESCALE
0 2,000 4,0001,000
Feet
EXPLANATION
CITY OF SAN LUIS OBISPO
PROJECT SITE
TANK FARM ROAD
SOUTH HIGUERA STREETBUCKLEY ROADVACHELL LANESUBURBAN ROAD
HORIZON LANESource: Esri, DigitalGlobe, GeoEye, i-cubed, Earthstar Geographics, CN ES/Airbus D S, USDA, USGS, AEX,Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User CommunityS:\GIS\1428_Avila_Ranch\ArcDocuments\007_1428.002_Addtnl_Hydro_Extents.mxd\11/30/2015FIGURE 2
EXT EN T OF AD DITIO NAL HYD RO LOGY INVESTIGATION
AVILA RANCHADDITIONAL HYDROLOGY SUPPORT
PREPARED FORCANNONSAN LUIS OBISPO, CALIFORNIA
APPROXIMATESCALE
0 500 1,000250Feet
PROJECT SITE
LEGE ND
CREEKS
PROPOSED STORM WATER MANAGEMENT IMPROVEMENTS
AVILA RANCH PROJECT BOUNDARY
TOPOGRAPHIC CONTOURS
TANKFARMCREEK
EAST BR A N C H S A N L U IS OBISPOCR E E K
PROPOSED DISCHARGE LOCATION !CHEVRON PR OP OSED STORM WATER MAN AGEMENT IMPROVEMENTS
NOTE: THIS ANALY SIS ONLY CONSIDERS STORMWATERMANAGEMENT IMPR OVEMENTS SOUTH OF TANK FARM ROAD ONLY. ADDITIONAL IMPROVEMENTS PROPSOED NORTH OF TANK FARM ROAD ARE BEYOND THE SCOPE OF THE CURR ENT ANALYSIS.
Attachment 1
Discharge Hydrographs
0501001502002503003504004505000 500 1000 1500 2000 2500Flow (cfs)Time (min)Existing Conditions HydrographsTotal2‐YearDischargeTotal10‐YearDischargeTotal25‐YearDischargeTotal50‐YearDischargeTotal100‐YearDischarge
0501001502002503003504004505000 500 1000 1500 2000 2500DFlow (cfs)Time (min)Post‐Restoration HydrographsTotal2‐YearDischargeTotal10‐YearDischargeTotal25‐YearDischargeTotal50‐YearDischargeTotal100‐YearDischarge