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2025 URBAN WATER MANAGEMENT PLAN <br /> MAY 2026/FINAL DRAFT/CAROLLO <br /> 2025 MET UWMP does not include Delta Conveyance Project yield in projected supplies pending future <br /> milestones and contracting decisions (MET, 2025). <br /> 6.2.6 Supply Reliability within MET <br /> MET's 2025 UWMP reports on its water reliability and identifies projected supplies to meet the long-term <br /> demand within its service area. The MET 2025 UWMP discusses the current water supply conditions and <br /> long-term plans for supply implementation and continued development of a diversified resource mix. <br /> It describes the programs being implemented, such as the CRA, SWP, Central Valley storage/transfer <br /> programs,water use efficiency programs, local resource projects, and in-region storage that will enable <br /> the region to meet its water supply needs. MET's 2025 UWMP also presents MET's supply capacities from <br /> 2025 through 2050 for average year, single dry year, five consecutive dry years, and more frequent and <br /> severe droughts, as specified in the UWMP Act. <br /> Information concerning MET's UWMP, including the background, associated challenges, and long-term <br /> development of programs for each of MET's supply sources and capacities have been summarized and <br /> included in the following subsections.Additional information on MET can be found directly in MET's <br /> 2025 UWMP. <br /> 6.2.6.1 MET's Water Service Reliability Assessment Results <br /> In MET's 2025 UWMP, MET evaluated supply reliability by projecting supply and demand under a normal <br /> year, single-dry year, and five-year consecutive dry years, based on conditions affecting the SWP (MET's <br /> largest and most variable supply). For this supply source, the average of historical years 1922-2021 most <br /> closely represents water supply conditions in a normal water year,the single driest year was 1977 and the <br /> five-year dry period was 1988-1992. The analyses also include Colorado River supplies under the same <br /> hydrological variations. <br /> MET also incorporated the SWP and Colorado River's reliability factors, such as water quality objectives set <br /> by the SWRCB, BiOps, and amendments to the Coordinated Operations Agreement for the SWP and <br /> Quantification Settlement Agreements for the Colorado River into their assessment. <br /> MET has concluded that the region can provide reliable water supplies under normal, single-dry, and <br /> five-year consecutive dry conditions (Tables 6.4, 6.5, and 6.6, respectively). <br /> In each of the following tables, "Current Programs" supplies include: <br /> ■ In-Region Supplies and Programs: <br /> Metropolitan Surface Storage (Diamond Valley Lake, Lake Mathews, Lake Skinner). <br /> » Flexible Storage in Castaic Lake and Perris Lake. <br /> Groundwater Storage for Conjunctive Use. <br /> ■ California Aqueduct (SWP), including Central Valley transfers and storage program supplies conveyed <br /> by the aqueduct. <br /> ■ Colorado River Aqueduct, including deliveries, programs, and exchanges with SDCWA. <br /> These supplies are impacted - typically reduced - by the single dry year and multiple dry year scenarios. <br /> Though demands increase in these drought conditions, MET projects reliable supply, even surplus, <br /> through 2050.The City is a MET member agency, and MET's projections take into account the imported <br /> CITY OF SANTA ANA <br />