HomeMy WebLinkAbout08/16/2011, C 3 - 2011 WATER RESOURCES STATUS REPORT council Mwig D�
j acEnba Report
CITY OF SAN LUIS OBIS PO
FROMc Carrie Mattingly, Utilities Director
Prepared By: Gary W. Henderson,Water Division Manager
SUBJECT: 2011 WATER RESOURCES STATUS REPORT
RECOMMENDATION
Receive and file the City of San Luis Obispo's 2011 Water Resources Status Report.
DISCUSSION
Annual reports relative to the City's water resources have been provided to the City Council since
1985. The 2011 Water Resources Status Report (WRSR) provides an overview of the City's
existing water resources and serves as an update on water supply projects being implemented to
meet the community's future needs.
The attached report discusses four major topics:
I. Existing Water Supply Status
U. Multi-Source Water Supply
III. Water Demand Management
IV. Projected Water Supply Situation
2011 Water Resources Status Report Summary
This past year's (July 1, 2010 to June 30, 2011)rainfall amounts were significantly above normal at
the City's two water supply reservoirs. With the abundant rainfall this past year, the.City's water
resources are in very good shape. Assuming an extended drought, period water supplies are still
projected to last at least to 2022. The City is continuing to expand the use of recycled water and
implement its ongoing water conservation program. In addition, the Nacimiento Pipeline Project
was completed this past year and water deliveries to the City's water treatment plant began on
January 5, 2011.
While the current water supply situation is favorable, the City needs to continue its water
conservation efforts to comply with State regulations and ensure long-term efficient use of its water
resources. The 2011 WRSR provides a synopsis of the City's water supply status and its ongoing
water conservation program efforts.
Existing Water Supply Status
The City's two water supply reservoirs (Salinas and Whale Rock) were at 99.3 percent and 80.9
percent of total storage capacity respectively as of June 30, 2011. The City's total water use for
2010 was 5,489 acre feet (af) compared to 6,134 of in 2009. The City's per capita water use was
considerably lower in 2010 as compared to the previous year. The per capita use rate is not the
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Council Agenda Report—2011 Water Resources Status Report Page 2
amount that the average person uses but takes into account all water uses including residential, .
commercial, industrial, landscape, etc. In 2010 the water use rate was 109 gallons per capita per
day (gpcd), a decrease from 2009 use rate of 122 gpcd. There are likely a number of factors that
led to this past year's drop in water use including significant rainfall and recessionary impacts
(vacancy rates, etc.).
Multi-Source Water Supply
For over 20 years, one of the major goals of the City Council has been the pursuit of additional
long-term water supplies to meet the current and future water demands of the community. With the
recycled water program, ongoing water conservation efforts, and the Nacimiento Pipeline Project
the City has attained this goal. This has been a significant accomplishment and will ensure reliable
water supplies for the community well into the future.
The Nacimiento Pipeline Project construction was completed this past year and water deliveries to
the City of San Luis Obispo began in January of 2011. The City has contractual rights for 3,380
acre feet per year from Nacimiento Reservoir.
Additional user sites continue to be added to the City's recycled water system. During 2010, six
new sites were connected to the City's recycled water distribution system. The use of the
recycled water at all of these sites is for landscape irrigation.
Based on the policies adopted in the. City's Water and Wastewater Management Element
(WWME), Table 1 below shows the available water supplies to serve the community's water
demands.
Table 1: Water Resource Availability
Water Resource _ . _ 2011 Annual Availabili
Salinas &Whale Rock Reservoirs 6,940 AF Safe Annual Yield
Nacimiento Reservoir 3,380 AF Contractual Limit
Recycled Water 153 AF 2010 Annual Usage
Siltation to 2060 (500 AF) WWME Policy A 4.2.2
TOTAL 91973 AF
Water Supply Accounting and Demand
The policies in the WWME establish that the City will account for water supplies necessary to
meet three specific community needs: 1) primary water supply, 2) reliability reserve, and 3)
secondary water supply which are discussed in more detail in the 2011 Water Resources Status
Report (Attachment A) and shown in Table 2 below.
Table 2: 2011 Water Supply Accounting.
Total Primary Water Reliability Reserve SecondaEAF
Supply Su
9,973AF 7,791 AF 1,237 AF 94
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Council Agenda Report—2011 Water Resources Status Report Page 3
Water Demand Management
The City's water conservation program continues to implement the California Urban Water
Conservation Council's Best Management Practices as defined in the Memorandum of
Understanding Regarding Urban Water Conservation in California. The program provides
technical assistance and other beneficial services to the community. With adequate water
supplies to meet both the current and future water needs as envisioned in the City's General Plan,
the water conservation program will continue to play an important role in the future as the City
potentially faces new water supply challenges attributable to climate change and regulatory
requirements related to statewide water use reduction goals.
Projected Water Supply Situation
The City utilizes a computer model to project how long the City's available water supplies will last
based on a number of assumptions. The model uses historical drought weather patterns, projected
water demands, and other factors to forecast the City's water supply position and to make certain
water policy recommendations. Assuming ongoing drought conditions, the model predicts current
water supplies will last into the year 2022. The additional water resources available from the
Nacimiento Project, recycled water, and ongoing conservation programs extends the City's water
supply at least five years beyond what would be estimated without these water resources.
Summary
For the past twenty years, the City of San Luis Obispo has been pursuing additional water resources
to meet the City's current and future water demands. The City has been a leader in the
implementation of water conservation strategies since the late 1980s and the community has
embraced the importance of using its water resources wisely. With the City Council's support for
the use of recycled water from the Water Reclamation Facility and this past year's completion of
the Nacimiento Project, the City of San Luis Obispo is very well positioned to meet both current
and future water needs within the community. The City Council has accomplished the "multi-
source" water supply policy as identified in the Water and Wastewater Management Element of the
General Plan and has also successfully established the "reliability reserve"which will serve the City
well in the event of unforeseen changes relative to the City's water supplies.
FISCAL IMPACT
There is no fiscal impact associated with the recommended action.
ATTACHMENT
2011 Water Resources Status Report
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Attachment
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Water Resources Status Report
2011 "
Prepared by:
Gary Henderson, Water
Division Manager
Ron Munds, Utilities Conservation Manager
Jennifer Meft, Utilities Project Manager
Deparbnem
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Attachment
TABLE OF CONTENTS
L EXISTING WATER SUPPLY STATUS...................................................................I
CurrentStatus....»....................................................»........................»......».....»...............»...1
IL MULTI-SOURCE WATER SUPPLY.......................................:................................3
WaterResource Availability........»....»....»....».»..»»..»...........»............»...........»....»........3
Salinas &Whale Rock Reservoirs».................».... .....».».»........».»..».....»»..»..._»»»...3
NacimientoReservoir.................................................................».........................a......»....»..4
RecycledWater...........................:.................:.................:..........................»............................4
Groundwater.:................................... ..............W..w:..........w..........................:......................4
Water Supply Accounting and Demand...................:........:..:.....W.................... .................5
III. WATER DEMAND MANAGEMENT.....................................................................6
CustomerService/Technical Assistance.........................................................»..»..»...»....»..8
PublicInformation&Education...:......:..................:...............................................................9
IV. PROJECTED WATER SUPPLY SITUATION....................................................10
Reservoir Storage Curve».........»...»»..».».....»..»».»......:.....». ...»»».»......».».».....».».»..10
V. SUMMARY.................................................... .................................:.....................10
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Attachment
City of San Luis Obispo
2011 Water Resources Status Report
The 2011 Water Resources Status Report for the City of San Luis Obispo was prepared
by the Utilities Department to provide the City Council and community members with an
update on the status of existing water resources. It also serves as an update on water
supply projects being implemented to meet the community's future needs.
The report covers four main areas:
I. Existing Water Supply Status
II. Multi-Source Water Supply
III. Water Demand Management
IV. Projected Water Supply Situation
The report evaluates the existing water supply situation for the City,identifies the amount
of water currently available to serve new development, and discusses iissues relative to
existing polices and water projects and programs being pursued.
I. EXISTING WATER SUPPLY STATUS
The City currently utilizes five sources of water.supply to meet the community's water
demand: Salinas Reservoir (also referred to as Santa Margarita Lake), Whale Rock
Reservoir, Nacimiento Reservoir, groundwater; and recycled water from the City's Water
Reclamation Facility. The City's newest water supply from Nacimiento Reservoir began
delivering water to the City's water treatment plant in January of 2011.
Current Status Table 1• Area Rainfall
For the 2010-11 Location 2010/11Average % of ,
rainfall year (October g Average
1 through September City of SLO—Reservoir#1 31.5" 22.4" 141%
30), rainfall for the Whale Rock Reservoir 29.71" 19.7" 150%
City was significantly Salinas Reservoir 35.01" 21.4" 164%
above normal as 1.Rainfall through June 30,2011
reflected in Table 1.
As of June 30, 2011, Salinas and Whale Rock Reservoirs were at 97.9 percent and 81.0
percent of total capacity respectively.
For the 2010 calendar year, the water demand for the City was provided from four
sources as shown in Table 2. The total water demand (based on water production figures)
for all City uses in 2010 was 5,489 acre feet which was approximately 10.5 percent lower
than the total water use for 2009.
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2011 Water Resources Status Report Attachment'
Page 2
Table 2: Water Supply Sources (acre feet)
Salinas Whale Rock Groundwater Recycled, Total El
2,426 of 2,757 of 153 of 153 of 5
The total amount of City water use shown in Table 2 does not include domestic water
delivered to Cal Poly State University. This use is separately accounted for from the
University's available water supply from Whale Rock Reservoir.
As of June 30, 2011, the City's available water storage in Salinas Reservoir (above
minimum pool, see definitions at end of report) was 21,334 acre feet. The City's share of
the Whale Rock storage (above minimum pool) was 14,425 acre feet. The combined total
water storage available to meet City water needs from these two sources was 35,760 acre
feet. This equates to 83 percent of maximum available storage.
Based on the available water storage in both reservoirs, estimated water from Nacimiento
Reservoir, estimated groundwater production, estimated recycled water deliveries, and
assuming the return of drought conditions as experienced during the late 1980s, the City
has approximately eleven years of water supply.
This estimate is based on data derived from the City's computerized reservoir storage
model and is shown in Figure 5 (Figures are provided at the end of report). The model
assumes additional conservation measures, consistent with the City's Water Shortage
Contingency Plan, are implemented when supplies are estimated to last three years or
less. The various stages of conservation are indicated in Figure 5 and are discussed in
more detail in the City's Water Shortage Contingency Plan. The Water Shortage
Contingency Plan is an appendix to the Urban Water Management Plan that was updated
and adopted in June of 2011.
Water Consumption
The total City water use for 2010 was approximately 10.5 percent lower than the use for
2009. Table 3 shows the population estimates from 2001 through 2010 as well as the total
City water use and corresponding per capita use rate. The past ten-year average per capita
water use was 121.6 gallons
per person per day (gpcd). Chart 1:Water Use by Category
Based on the policies Landscape
contained in the Water and Irrigation Single
Wastewater Management Non- 10% Family
Element of the General Plan, Residential Residential the City uses the ten-year 29% 41,0
average per capita water use GL�;D
to project the required water Multi-family
Residential
needed to serve the build-out 20%
population as identified in the
Land Use Element of the General Plan.
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2011 Water Resources Status Report `J Attachment
Page 3
Chart 1 shows the water use between different customer classes for 2010 which is
consistent with previous years. (landscape irrigation is only that water use specific to
dedicated landscape meters).
While the per capita water use increased following the end of the 1986-91 drought and
the end of mandatory conservation measures in 1992, the use rate has somewhat
stabilized as shown in Table 3. The 2010 per capita water use was approximately 109
gpcd, which was a significant decrease from the 2009 use of 122 gpcd.There are likely a
number of factors that led to this past year's drop in water use including significant
rainfall and recessionary impacts (vacancy rates, etc.).
Table-3: Population Estimates, Water Use & Rainfall
Year Population Total Water Use Per Capita Rainfall
(acre feet) (gpcd) (inches)
2001 44;347 5,886 119 24.53
2002 44,482 6,032 121 15.94
2003 44,357 5,968 120 22.91
2004 1 44;298 6,239 126 16.08
2005 1 44,687 6,098 122 40.09
2006 44,559 5,999 120 30.35
2007 44,433 6,493 130 10.28
2008 44,579 6,359 127 19.92
2009 44,829 6,134 122 L772010 44,948 5,489 109
Ten-year per capita averse 121.6
1.Rainfall amounts for July through June from Cal Poly weather station
2.Rainfall amount from County rain gage at City's Reservoir#I
II. MULTI-SOURCE WATER SUPPLY
The City has adopted a multi-source water policy to provide increased reliability for
meeting the community's water supply needs. With the addition of the Nacimiento
Reservoir supply, the City now has five sources of water.and has accomplished the goal
of diversifying its water supply portfolio to meet current and future community needs.
The following sections provide an overview of each water source available to the City.
Water Resource Availability
Salinas & Whale Rock Reservoirs
Salinas and Whale Rock Reservoirs have been the City's primary water supplies for over
50 years. The County of San Luis Obispo Flood Control and Water Conservation District
provides the oversight, operations, and maintenance of the Salinas Dam and water
delivery facilities for the benefit of the City. The City pays the County for the associated
costs for these services. The City provides the oversight, operations, and maintenance of
the Whale Rock Reservoir for the benefit of the Whale Rock Commission. The Whale
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2011 Water Resources Status Report Attachment
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Rock Commission is a joint powers agency made up of Cal Poly State University,
California Men's Colony, and the City. The City draws water from these two reservoirs
in a coordinated manner to maximize the long-term water supply available from these
two sources. In addition, the City has adopted policies in the Water and Wastewater
Management Element of the General Plan to account for reductions in storage capacity at
each lake resulting from siltation.
Nacimiento Reservoir
The City has been involved in the Nacimiento Project planning efforts for over 15 years.
Construction of the 45-mile pipeline and related facilities was completed in December
2010. Water deliveries to the City's water treatment plant began on January 5, 2011. The
City has a contractual right to 3,380 acre feet per year_and will likely maximize the use of
this water each year since the contractual amount of water. cannot be carried over
("banked") from year to year. Current use for this first year is estimated to be about 2,000
acre feet.
Recycled Water
Recycled water use for the 2010 year totaled just over 153 acre feet, up over ten percent
from 138 acre feet in 2009. During 2010, six new sites (eight additional meters) were
connected to the City's recycled water distribution system (Table 4 below). The use of
the recycled water at all of these sites is for landscape irrigation.
Table 4:New Sites using Recycled Water in 2010;
Site Address AF
Los Verdes Park I HOA(2 meters) Los Osos Valley Road at South Higuera 6.5 acre feet
DeVaul Park 1593 Madonna Road 2.0 acre feet
DeTolosa HOA(2 meters) 1501 and 1601 Madonna Road 3.7 acre feet
Los Osos Valley Road median Madonna Road @ Los Osos Valley Road 0.5 acre feet
Mission Community Bank 3380 Higuera S. 0.5 acre feet
Meathead Movers&Storage 3600 Higuera S. 0.5 acre feet
Total 13.7 acre feet
Two new development sites, Prefumo Creek Commons and the Hampton Inn, are planned
to receive recycled"water in 2011. These new recycled water use sites are estimated to use
ten acre feet per year.
Groundwater
The City uses one domestic well to supplement its other water supply sources. In
addition, there is a non-potable well at the City's Corporation Yard for use for
construction activities. There are two wells at the City's Laguna Lake Golf Course that
provide for a portion of the golf course irrigation needs. The additional irrigation
demands at the golf course are met with recycled water.
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2011 Water Resources Status Report Attachment
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Based on the policies adopted in the City's Water and Wastewater Management Element
of the General Plan, Table 5 below shows the available water supplies to serve the
community's water demands.
Table 5: Water Resource Availability
- - - . .
Water Resource 2010 Annual Availabili "
- - - - - -
Salinas_&Whale Rock Reservoirs_ 6,940 AF Safe Annual Yield
Nacimiento Reservoir 3,380 AF Contractual Limit
Recycled Water 153 AF 2010 Annual Usa e
Siltation to 2060 (500 AF) WWME Policy A 4.2'.2
TOTAL 99973 AF .
Water Supply Accountinx and Demand
The policies .in the Water and Wastewater Management Element of the General Plan
establish that the City will account for water supplies necessary to meet three specific
community needs: 1) primary water supply, 2) reliability reserve, and 3) secondary water
supply which are discussed in more detail below and shown in Table 6.
Primary Water Supply
The primary water supply is defined as the amount of water needed to serve the build-out
population of the City as identified in the Land Use Element of the General Plan. The
quantity of water needed for the primary water supply is calculated using the ten-year
average of actual per capita water use, shown in Table 3, and the City's build-out
population (57,200).
Reliability Reserve
The reliability reserve provides a buffer.for future unforeseen or unpredictable long-term
impacts to the City's available water supply. The quantity of water for the reliability
reserve is established using twenty percent of the ten-year average of actual per capita
water use and the existing City population. The reliability reserve concept is included in
the City's Charter (Section 909) which identifies that the water cannot be used to allow
additional development.
Secondary Water Supply
The secondary water supply.is the amount of water remaining from the City's available
water resources above those needed to meet the primary water supply and reliability
reserve. The secondary supply is identified to meet peak water demand periods or short=
term loss of City water supply sources.
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O
2011 Water Resources Status Report Attachment
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Table 6: 2011 Water Supply Accounting
Total Primary Water Reliability Reserve _ y Secondary Water
Supply l Supply
9,973 AF 7,791 AF 1,237 AF 945 AF JI
III.WATER DEMAND MANAGEMENT
The City's water conservation program is an integral part of its overall water
management strategy. The program has assisted in adding reliability to the water supply
system over the years. In the late 1980's, the City implemented effective water efficiency
programs and policies that allowed continued growth and economic development within
the community even during water-constrained periods. Even with a more diversified
multi-source water supply portfolio in 2011, conservation will continue to play an
important role in the future as the City potentially faces new water supply challenges
attributable to climate change and regulatory requirements related to statewide water use
reduction goals.
Historically the City has utilized the California Urban Water Conservation Council's
(CUWCC) Best Management Practices (BMPs) as defined in the Memorandum of
Understanding Regarding Urban Water Conservation in California (MOU) as a guide for
the City's water conservation program. The BMPs are programs and services that MOU
signatories agree to implement over time. Based on the BMPs, the City's water
conservation program in the past has been divided into three primary components:
financial incentives, technical assistance, and public education.
Because of the changing regulatory requirements and water supply availability, the
following sections describe the shifting role of water conservation within the community
and the evolution of the programs and services offered by the Utilities Department.
Recent Water Use Efficiency Legislation
There are two pieces of legislation that have been passed since 2007 that require water
agencies to implement water conservation measures in order to be eligible for state
grants, loans, or assistance. Eligibility for grants and loans apply to both water and
wastewater projects that the City may undertake. The following is a summary of the
legislation:
AB 1420
Assembly Bill 1420 (Stats. 2007, ch. 628) amended the Urban Water Management
.Planning Act, Water Code Section 10610 et seq., to require, effective January 1, 2009,
that the terms of, and eligibility for, any water management grant or loan made to an
urban water supplier and awarded or administered by the Department of Water Resources
(DWR), State Water Resources Control Board, or California Bay-Delta Authority, be
conditioned on the implementation of the water Demand Management Measures (DMMs)
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2011 Water Resources Status Report Attachment
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described in Water Code Section 10631(f). DWR was given discretionary authority to
determine whether an urban water supplier is eligible for a grant or loan.
SBx7-7
Senate Bill x7-7 was enacted in November 2009, requiring all water suppliers to increase
water use efficiency. The legislation sets an overall goal of reducing per capita urban
water use by 20 percent by December 31, 2020. The law directs incremental progress
towards this goal by reducing per capita water use by at least ten percent by December
31, 2015.
The law states:
• Each urban retail water supplier shall develop water use targets and an interim
water use target by July 1, 2011.
• An urban retail water supplier shall include in its water management plan, due
July 2011, the baseline daily per capita water use, water use target, interim water
use target, and compliance per capita water use.
• Effective 2016, urban retail water suppliers who do not meet the water
conservation requirements established by this
bill are not eligible for state grants or loans. Table 7: 2015 and 2020
Targets_ .
The City's 2010 Urban Water Management Plan Year Adjusted Per
provides a complete discussion of the legislative Ca ita Target
requirements. Table 7 summarizes the per capita 2015 120 gpcd
targets the City must meet in order to be in
compliance with the law..
2020 117 gpcd
Financial Incentives Summary
Financial incentives have been an important tool for the water conservation program
since 1990. For a number of years, toilet retrofitting was the focus of the incentive
program with the toilet rebate program running from June 1990 through June 2007. The
high efficiency washing machine rebate program was added to the financial incentive
program in 2001 and is still in place today within minimum funding levels. New
irrigation equipment incentive pilot programs were tested in the summer/fall of 2008 and
were added to the incentive program in 2009. The following is a summary of the financial
incentive programs.
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2011 Water Resources Status Report Attachment
Page 8
High Efficiency Washing Machine Replacements
The high efficiency washing machine rebate program was implemented in 2001 and
offers a $150 dollar rebate for qualifying machines. As indicated in Table 8, participation
in the program has been up
and down over the years. In Table 8: Washing Machine Rebates
2009 the program had a Year Rebate Savings in acre
record high of 175 rebates. _ feet per year
In 2010 rebate funds were 2001-2005 354 5.97
reduced by 50% thereby 2006 47 .78
limiting the number of 2007 76 1.2
participants in the program. 2008 147 2.26
It is estimated that about 2009 175 2.70
14.11 acre feet of water is
saved annually by these 2010 76 1.2
water efficient machines To 799 14.11
with energy savings as a side -
benefit.
Irrigation Equipment Replacement
Added to the financial incentive program in late 2008, the first irrigation efficiency
rebates were issued in 2009. The focus of the program
is on the replacement of old irrigation controllers in Table 9: 2010 Irrigation
commercial landscapes. Prior to receiving the Equipment
incentive, the irrigation system is required to be Description Number
audited and repaired to bring it up to standards. Table
9 summarizes the participation in the program.. Irrigation 11
Controllers
Customer Service/Technical Assistance.
Residential and Commercial Assistance
The City offers technical assistance to water customers via free indoor and outdoor water
consultations or audits. The consultations can either Table 10- 2010 Water Audits
be by phone or in person. In person consultations
include indoor and outdoor leak detection services, Description Number
irrigation system evaluation, landscape plant material
information, and other information on how to use Excessive Irrigation 302
water efficiently. Toilet Leak 248
Irrigation Leak 173
The requests for consultations are typically received Service Line Leak 63
from people experiencing high water bills, residents
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2011 Water Resources Status Report Attachment
Page 9
participating in the low income assistance program, or customers requesting a utility bill
adjustment through the Utility Billing Adjustment Committee. Water audits often reveal
problems which are then corrected by the property owner resulting in lower water use and
reduced water bills.
The most common problems experienced by customers are summarized in Table 10. A
total of 1,814 contacts were made, either by letter, telephone, or direct contact during
2010.
Past practice included mailing letters to customers using more than 25 units of water per
billing cycle in the summer and 20 units in the winter. In 2010, 1,475 letters were sent to
customers with high water use. This program is being curtailed for fiscal year 2011-2012
due to adjusted priorities and workload measures in the Utilities Conservation section.
Public Information & Education
In an ongoing effort to educate the public,.the City provides informational brochures on a
variety of water conservation, water quality, energy conservation, and recycling topics
upon request. Additionally, a quarterly newsletter is produced which focuses on current
information regarding water, wastewater, stormwater, and solid waste issues. The
newsletter is mailed to approximately 21,000 households. Additional information has
been distributed through paid media advertising, public service announcements, and
participation at Farmer's Market, home shows, etc.
In 1999, the Utilities Department implemented a water education program within San Luis
Coastal Unified School District. The program targets third through fifth grade students and
compliments the study of water within the School District's existing curriculum. Teachers
have been enthusiastic about the program, particularly with the field trip to the Water
Reclamation Facility.
During the 2010-2011 school year, ten class presentations and eight field trips were given
for schools within the City. The class presentations were 45 minutes and covered the
subjects of the water cycle, treatment, use, conservation, and reclamation. The classroom
presentation is a prerequisite for the field trip.
A new water quality module focusing on storm water runoff and creek and ocean health
has been developed. This will add another option for teachers to select when looking for
water education activities. Eight water quality class presentations were given during this
school year.
Summary
The City has implemented numerous programs over the years which have resulted in a
dramatic decrease in per capita water use since the late 1980's. The water conservation
program has provided many economic benefits to the community while adding reliability
to the water supply. The program has also brought per capita water use to a level where it
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2011 Water Resources Status Report O Attachment
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will, be relatively straightforward for the community to be in compliance with the state's
mandatory water reduction goals in the future. With adequate water supplies to meet both
the current and future water needs as envisioned in the City's General Plan, the water
conservation program will play a different but continuing role for the City in the future.
IV.PROJECTED WATER SUPPLY SITUATION
Reservoir Storage Curve
The Reservoir Storage.Curve is integral to the City's annual water resource analysis. It is
based on a computer model used to estimate the City's future reservoir storage in Salinas and
Whale Rock Reservoirs, utilizing historical drought weather patterns, water use projections,
reservoir data, and available water supplies from Nacimiento Reservoir, recycled water, and
limited groundwater. The model is used to forecast the City's water supply position and to
make certain water policy recommendations. Figure 5 shows the Reservoir Storage Curve.
The model assumes implementation of Stage I conservation when supplies are projected to
last only three years. Stages II and III conservation measures are implemented when water
supplies are estimated to.last only two years and one year, respectively(as shown on Figure
5). The model was updated to reflect the City's current water storage and assumptions
relative to water demands and drought conditions.
The model predicts current water supplies will last into the year 2022(Figure 5).
V. SUMMARY
This past year's rainfall was significantly above normal for the area. The City's surface
water supplies from Salinas and Whale Rock Reservoirs are in very good shape. Even
with these available supplies, the community must continue to utilize water in an efficient
manner. Water conservation will continue to be.an important element of the City's water
resources planning in the future and the State's requirement for reducing urban water use.
With the multi-source water policy, the completion of the Nacimiento Project this year,
planned expansion of users for recycled water, strong water conservation programs, and
other related policies which were adopted as part of the Water and Wastewater Management
Element, the City has implemented a long-term strategy which will ensure a reliable supply
of water to meet the current and future needs of the community.
Attachments:
1. Definitions & Information
2. Figures 1-5
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ATTACHMENT_
Definitions & Information
Safe Annual Yield:
The maximum quantity of water which can be delivered from the water source each year
during a critical dry period(i.e.historical drought period).
Minimum Pool:
Minimum amount of water in Whale Rock or Salinas Reservoirs below which water
deliveries must be stopped. This amount is established at 2,000 acre feet which is left in the
reservoirs to support aquatic habitat and other wildlife.
Acre Foot:
* I acre foot=325,851 gallons
* Enough water to cover a football field with 1 foot of water
* Enough water to serve approximately 3.5 average single family homes (in San Luis
Obispo)per year
Gallons per Capita per Day(gpcd):
Calculation=Total Acre Feet x 325.851
City Population x 365
Present Water Demand(acre feet per year):
Calculation= 145 gpcd x Current City Population x 365
325,851
Salinas Reservoir:
Maximum Storage Capacity=23,842.9 acre feet
Minimum Pool =storage amount when water extractions must cease=2,000 acre feet
Surface Area=730 acres
Drainage Area= 112 square miles;=71,700 acres
Whale Rock Reservoir:
Maximum Storage Capacity=40,662 acre feet
Minimum Pool =storage amount when water extractions must cease=2,000 acre feet
Surface Area.=594 acres
Drainage Area=20.3 square miles= 13,000 acres
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