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Home My WebLink About05-05-2015 SS2 Potable Water Distribution System Operations Master Plan Pressure Zone Service Area (acres) # Parcels 1 Alrita <10 13 2 Andrews 60 174 3 Bishop 385 1,043 4 Downtown 850 2,880 5 Edna Saddle 2,300 3,312 6 Ferrini 40 80 7 Foothill 470 1,364 8 High Pressure 320 662 9 Highland 80 140 10 Patricia 120 369 11 Reservoir #1 230 555 12 Reservoir Canyon 10 2 13 Rosemont 10 9 14 Serrano 85 146 15 Slack 90 250 16 Terrace Hill 1,030 2,975 Existing Water Pressure Zones. FROM: Carrie Mattingly, Director of Utilities Prepared By: Aaron Floyd, Deputy Director, Water Jennifer Metz, Utilities Projects Manager SUBJECT: REVIEW 2015 POTABLE WATER DISTRIBUTION SYSTEM OPERATIONS MASTER PLAN RECOMMENDATION Review the 2015 Potable Water Distribution System Operations Master Plan and provide feedback. BACKGROUND The purpose of this study session is to discuss the 2015 Potable Water Distribution System Operations Master Plan (Operations Master Plan). A key component of the Plan is a hydraulic model that details how water moves throughout the City’s potable water distribution system as well as the current condition of the system. The output of the hydraulic model provides important information related to water pressures and volume that in turn informs operations and long-range capital improvement planning. At this meeting, staff will provide a brief update on the drought. Thorough discussion on the drought and the City’s current water supply condition will take place at a special City Council meeting on May 26 or at the regular meeting scheduled for June 2. Additionally, the City will hold a Community Water Forum on Thursday, May 28, 2015 from 5:00 to 8:00 p.m. at the Ludwick Center. The purpose of the Forum will be to engage attendees, in an interactive manner, on the community’s water resources, effective conservation techniques, and actions related to the drought. The City owns and operates a distribution system with 16 pressure zones, over 145 miles of pipe, ten treated water storage tanks, two treated water reservoirs (Reservoir 1 in Reservoir Canyon and Reservoir 2 in Stenner Canyon), five hydro‐ pneumatic tanks, eight pump stations, and 21 pressure reducing valves (PRVs). The distribution system expanded incrementally as the City grew into the hills and valleys of the local geography. The May 5, 2015 SS2 SS2-1 2015 Potable Water Distribution System Operations Master Plan Page 2 result is an unusually high number of pressure zones as well as complex day‐to‐day and emergency operational requirements. In order to better understand the water system’s operational capabilities and assist in prioritization of capital improvement projects, the City Council approved funding to prepare an Operations Master Plan as part of the 2012-13 Mid-Year Budget. In April 2013, the City entered into an agreement with the Wallace Group for the preparation of an Operations Master Plan with the following work scope: 1. Review and analyze water consumption data from the city’s geographic information system on pipe location, type, size, and age. 2. Utilize existing and future land use information from the 2014 Land Use Element including development planned for all Special Focus Areas. 3. Determine water demand factors for residential and non‐residential uses for each pressure zone. 4. Provide recommendations for design criteria to be used to evaluate the hydraulic performance of the City’s water system components. 5. Evaluate existing and future operational, emergency, and fire protection water storage. 6. Conduct fire flow testing for use in water model calibration. 7. Prepare a hydraulic model to evaluate existing and future conditions. 8. Evaluate the impacts of development on the existing water distribution system based on future land use scenarios. 9. Prepare a prioritized capital improvement program for the City to utilize for 20 years. Additional funding was approved for the Operations Master Plan in early 2015 to include surveying of the City’s water tanks to verify base, inlet and overflow elevations for use in the hydraulic model. Hydraulic modeling enables the City to better understand the behavior of the water that moves throughout the water distribution system and its complex pressure zones. This type of modeling uses factors such as elevation, pipe size, and pipe type, to ensure adequate water pressure for consumers and flow at hydrants in the event of a fire emergency. The City’s water model has already proven to be beneficial and will continue to be used to predict pressures, quickly determine system infrastructure and operational needs, and demonstrate the effectiveness of proposed solutions. The model also provides the ability to test different alternatives that use the existing system to full advantage and improves the ability to prioritize capital improvements. DISCUSSION City staff worked extensively with the Wallace Group in the development of the Operations Master Plan. The success of this project was a result of collaboration between the Wallace Group consulting engineering team and the professional distribution system operators who brought hands-on knowledge acquired through years of working on the system. Staff from the SS2-2 2015 Potable Water Distribution System Operations Master Plan Page 3 Community Development Department provided existing and future land use data from the 2014 Land Use Element. Staff from the Fire Department, including the Fire Chief and the Fire Marshal contributed during the Operations Master Plan’s preparation. City GIS staff is currently working to make water pressure information from the hydraulic model available to the Fire Department should it be required in an emergency. This information will also be available to more readily answer questions that arise related to fire flow needs. The Operations Master Plan includes recommendations to address existing health and safety deficiencies within the potable water distribution system based on today’s standards and requirements, as well as accommodate future development. Key highlights include: 1. The City is fortunate to have an abundance of operational, fire, and emergency water storage. 2. Replacing and downsizing the City’s largest treated water reservoirs will offer greater reliability. 3. The City has an opportunity to consolidate pressure zones, while improving fire flow, retiring aged pump stations and water tanks rather than replacing them. 4. The hydraulic modeling effort produced numerous recommendations that will make the City’s potable water distribution system more resilient. Project Prioritization Water system projects were prioritized into three categories with one being the highest priority projects and three being the lowest. Priority One Pressure < 30 psi High velocities Areas < 50 percent of required fire flow based on land use Frequency of water main breaks Water mains > 75 years old Priority Two Pressure < 40 psi Areas < 75 percent of required fire flow Water mains > 50 years old Priority Three Does not meet current standards for pipe size Does not meet current standards for pipe material The recommendations in the Operations Master Plan will assist the City in prioritizing both current and future water system needs. Implementation of the Plan will eventually lead to the removal of assets such as pump stations and tanks (i.e. Bishop pump station, Bressi pump station and Serrano tank, McCollum pump station/Slack tank, and Ferrini pump station and Ferrini tank). The Plan recommends numerous pressure zone consolidation projects to reduce operational and long-term infrastructure maintenance and replacement costs. In 2014, after going to bid, a project was canceled based on water model data that demonstrated how water could be SS2-3 2015 Potable Water Distribution System Operations Master Plan Page 4 re-routed and the pipeline could be abandoned instead of being replaced. This resulted in savings of approximately $750,000. The hydraulic model will be used to evaluate future development projects and has already been used for water main sizing for the projects in the Airport Area and Orcutt Area Specific Plan, and contribute to the design of capital improvement projects. ENVIRONMENTAL REVIEW An Initial Study will be prepared after the City Council’s feedback is incorporated into the Operations Master Plan. A Negative Declaration, Mitigated Negative Declaration or Environmental Impact Report, will be included in the Council Agenda Report for final consideration by the City Council. FISCAL IMPACT There is no immediate fiscal impact associated with this report and the recommended action. However, the total cost for projects identified as first priority is estimated to be $26,672,030. Second priority projects total $14,428,906, and third priority projects total $9,043,580. All estimated costs are in 2015 dollars. Funding to support water distribution system improvements and to maintain the hydraulic model developed as part of the Operations Master Plan will be identified in future budgets for Council consideration and approval beginning with the 2015-17 Financial Plan. AVAILABLE FOR REVIEW IN THE COUNCIL OFFICE 2015 Potable Water Distribution System Operations Master Plan, April 2015, prepared by The Wallace Group. T:\Council Agenda Reports\2015\2015-05-05\Water Master Plan (Mattingly-Floyd-Metz) SS2-4 Utilities Department Potable Water Distribution System Operations Master Plan slowater.org slowater.org Fire and Plumbing Codes Existing Quality of Life Planning for the Future slowater.org  Potable Water Distribution System Operations Master Plan  slowater.org  Potable Water Distribution System Operations Master Plan   Potable Water Distribution System Operations Master Plan  slowater.org What is a pressure zone? slowater.org  Potable Water Distribution System Operations Master Plan  Water Distribution System Needs Fire Storage and Flow Requirements Emergency Storage – power outages slowater.org  Potable Water Distribution System Operations Master Plan  Water System Needs Pressure and volume too low Pressure too high Water quality slowater.org  Potable Water Distribution System Operations Master Plan  Existing Data Used / New Data Collected Hydrant Flow Testing Survey of Tank Elevations GIS Inventory of Age, Type, and Size Land Use (existing and future) slowater.org  Potable Water Distribution System Operations Master Plan  slowater.org  Potable Water Distribution System Operations Master Plan  Citywide Hydraulic Water Model slowater.org  Potable Water Distribution System Operations Master Plan  16 ZONES 10 TANKS 8 PUMP STATIONS slowater.org  Potable Water Distribution System Operations Master Plan   Potable Water Distribution System Operations Master Plan  16 9 ZONES 10 7 TANKS 8 4 PUMP STATIONS slowater.org Serrano Zone Consolidation. Ferrini Zone Consolidation. Slack Zone Consolidation. Serrano Tank Ferrini Tank Slack Tank slowater.org  Potable Water Distribution System Operations Master Plan   Potable Water Distribution System Operations Master Plan  Key Findings / Recommendations Phase 1 of the Johnson Avenue Waterline Replacement project Key Findings / Recommendations Don’t replace the floating covers, replace the reservoir… Benefits of consolidation slowater.org  Potable Water Distribution System Operations Master Plan  Key Findings / Recommendations Retire aged pump stations and tanks rather than replace them Prioritize replacement of aged pipelines slowater.org  Potable Water Distribution System Operations Master Plan  Fire >75 yrs Low Pressure History of Breaks Does Not Meet Current Standards slowater.org  Potable Water Distribution System Operations Master Plan  $26.7 M $14.4 M $9.0 M Feedback slowater.org  Potable Water Distribution System Operations Master Plan  Drought Update How Much Water Do We Have? Behind the Scenes of the City’s Water Projection Model Model Inputs Reservoir Levels •Rainfall Naci Pipeline Recycled Water What Changed? October 2014 – 7 years Recalibrated the Model 2012, 2013, 2014 Naci down 10 months 7.0 yrs - 0.5 yrs - 2.5 yrs - 0.5 yrs ________ 3.5 yrs 108 gpcd = 3.5 yrs 101 gpcd = 4.5 yrs