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2025 URBAN WATER MANAGEMENT PLAN <br /> MAY 2026/FINAL DRAFT/CAROLLO <br /> by 2045 (Delta Conveyance Design and Construction Authority, 2024), though its implementation faces <br /> strong opposition by environmental organizations and other interests in the Delta.The maximum value of <br /> the Delta Conveyance Project, when coupled with 250,000 AF of new regional storage, is estimated to be <br /> 367,000 AFY for MET and 63,000 AFY for Orange County.The Delta Conveyance Project also reduces the <br /> probability that any shortage occurs by about 10 percent, meaning a doubling of the time between <br /> shortage conditions from once every 5 years to once every decade (MWDOC, 2023). <br /> 6.2.3.2 Current Conditions and Supply <br /> Just like the Colorado River, the amount of water that can be delivered from the SWP to its 29 contractors <br /> varies annually based on hydrology and reservoir storage along the SWP. The DWR publishes the <br /> maximum entitlement of SWP water for each water contracting agency in "Table A." DWR sets these <br /> allocations to balance the needs for human health and safety, agricultural, and municipal water, <br /> considering factors like reservoir storage, runoff forecasts, and Endangered Species Act (ESA) <br /> requirements.The primary drivers that influence allocations are hydrologic conditions (precipitation and <br /> snowmelt) along with storage levels, especially in Lake Oroville.Actual deliveries typically average less <br /> than 50 percent of Table A due to hydrologic and regulatory constraints (MET, 2025). MET's actual annual <br /> allocations based on springtime Table A values for the past UWMP cycles are summarized in Table 6.3. <br /> Table 6.3 MET SWP Program Capabilities <br /> Year I Average Annual Table A Spring Allocation(MAF) <br /> 2015 10.38 <br /> 2020 0.38 <br /> 2025 0.96 <br /> Percent Change0) +252.6% <br /> Notes: <br /> (1) Percent change is between the years 2020 and 2025.Source:SWP Allocations 1996-2026. <br /> SWP contractors may additionally receive Article 21 water on a short-term basis in addition to Table A <br /> water if requested.Article 21 of SWP contracts allows contractors to receive additional water deliveries <br /> only under specific conditions, generally during wet months of the year (December through March). <br /> Because a SWP contractor must have an immediate use for Article 21 supply or a place to store it <br /> outside of the SWP, there are few contractors like MET that can access such supplies (MET, 2025). <br /> Carryover water is SWP water allocated to an SWP contractor and approved for delivery to the contractor <br /> in a given year but not used by the end of the year.The unused water is stored in the SWP's share of San <br /> Luis Reservoir, when space is available, for the contractor to use in the following year (MET, 2025). <br /> Turnback pool water is Table A water that has been allocated to SWP contractors who have exceeded <br /> their demands.This water can then be purchased by another contractor depending on its availability <br /> (MET, 2025). <br /> The following factors affect the ability to estimate existing and future water delivery reliability: <br /> ■ Water availability at the source:Availability can be highly variable and depends on the amount and <br /> timing of rain and snow that fall in any given year. Generally, during a single dry year or two, surface <br /> and groundwater storage can supply most water deliveries, but multiple dry years can result in <br /> CITY OF SANTA ANA <br />