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2025 URBAN WATER MANAGEMENT PLAN <br /> MAY 2026/FINAL DRAFT/CAROLLO <br /> Forecast Informed Reservoir Operations (FIRO) at Prado Dam - Stormwater represents a significant <br /> source of water used by OCWD to recharge the OC Basin. Much of this recharge is made possible by the <br /> capture of Santa Ana River stormflows behind Prado Dam in the Conservation Pool. FIRO represents the <br /> next generation of operating water reservoirs using the best available technology.Advances in weather <br /> and stormwater runoff forecasting hold promise to allow USACE to safely impound more stormwater <br /> while maintaining equivalent flood risk management capability behind Prado Dam.Analyses indicate that <br /> FIRO would increase average annual recharge by approximately 4,000 to 6,000 AFY, and up to 23,000 AF <br /> in very wet years, consistent with earlier preliminary analyses. Federal and local partners have indicated <br /> FIRO at Prado Dam is moving from technical assessment toward implementation via Water Control <br /> Manual (WCM) updates. <br /> 6.4 Surface Water <br /> 6.4.1 Existing Surface Water Sources <br /> There are, currently, no direct surface water uses in the City's service area. <br /> 6.4.2 Planned Future Surface Water Source: <br /> As of 2025, there are no planned surface water uses in the City's service area. <br /> 6.5 Stormwater <br /> 6.5.1 Existing Stormwater Sources <br /> There are, currently, no direct stormwater uses in the City's service area. <br /> 6.5.2 Planned Future Stormwater Sources <br /> The City is implementing a multi-benefit stormwater capture and reuse project on approximately 1.3 acres <br /> of vacant, City-owned parcels located along Bristol Street and Tolliver Street.This collaborative effort <br /> between the Public Works Agency and the Parks and Recreation Department integrates urban greening <br /> with innovative water management practices to support the development of a new city park.The project <br /> is funded through a $3,502,500 grant from the California Natural Resources Agency's Urban Greening <br /> Grant Program, exemplifying the City's strategic use of urban greening and drought-tolerant landscaping <br /> funds to advance stormwater management and water reuse objectives. <br /> Stormwater best management practices are designed to capture and treat or reuse runoff from a 5.2-acre <br /> drainage area. Due to site constraints, infiltration is not feasible; instead, captured runoff will be stored <br /> and reused for the park's drip irrigation system, providing a sustainable water source for landscape <br /> maintenance and supporting regional water conservation goals.The designed volume captured for the <br /> bioretention basin is 2,940 cubic feet (approximately 22,000 gallons) and the harvest/reuse system is <br /> 3,015 cubic feet (approximately 22,500 gallons). <br /> As a pilot initiative, the Bristol &Tolliver project will serve as a test case for evaluating the feasibility and <br /> performance of stormwater reuse for irrigation within the City's park system. Upon completion, the <br /> CITY OF SANTA ANA <br />