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2025 URBAN WATER MANAGEMENT PLAN <br /> MAY 2026/FINAL DRAFT/CAROLLO <br /> precipitation were applied to the hottest and driest historical sequences to calculate high-demand <br /> scenarios,which were expressed as scaling factors relative to the 33-year average demand. <br /> Table 7.1 Retail: Basis of Water Year Data (Reliability Assessment) <br /> O• Data(Reliability Assessment) <br /> Available Supplies if <br /> Year Type Repeats <br /> Check the box if quantification of available supplies <br /> Base Year C is not compatible with this table and is provided <br /> If not using a calendar elsewhere in the UWMP. <br /> year,type in the last year Location: [insert location from UWMP] <br /> Year Type of the fiscal,water year, <br /> or range of years,for <br /> example,water year Quantification of , .• - supplies is provided <br /> 2024-2025,use 2025 this table as either volume only, percent only, or <br /> both. <br /> Volume Available %of Average Supply <br /> Average Year 1991-2024 100% <br /> Single-Dry Year 2014 103% <br /> Consecutive Dry Years 1st Year 1991-2024 103% <br /> Consecutive Dry Years 2nd Year 1991-2024 112% <br /> Consecutive Dry Years 3rd Year 1991-2024 113% <br /> Consecutive Dry Years 4th Year 1991-2024 115% <br /> Consecutive Dry Years 5th Year 1991-2024 117% <br /> 7.2 Factors Affecting Water Supply Reliability <br /> To prepare realistic water supply reliability assessments, various factors affecting reliability were <br /> considered. These include climate change and environmental requirements, regulatory changes,water <br /> quality impacts, and locally applicable criteria. In May 2025, DWR published a technical addendum to the <br /> 2023 State Water Project Delivery Capability Report (DCR) describing the impact of subsidence to future <br /> SWP deliveries. The study showed that SWP deliveries could be reduced by future subsidence. DWR <br /> recommends using the 2025 DCR to support long-term planning efforts because DWR has planned <br /> near-term fixes and is committed to restore the conveyance capacity of the California Aqueduct. MET will <br /> continue to stay informed and incorporate any suitable subsidence modeling in the future. <br /> 7.2.1 Climate Change and the Environment <br /> Changing climate patterns are expected to shift precipitation patterns and affect water supply availability. <br /> Unpredictable weather patterns will make water supply planning more challenging.Although climate <br /> change impacts are associated with exact timing, magnitude, and regional impacts of these temperature <br /> CITY OF SANTA ANA <br />