Item 28 - Urban Water Management Plan and Water Shortage Contingency Plan

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Santa Ana 2020 Urban Water Management Plan arcadis.com 3-6 Fourteen of the City Wells pump into surface reservoirs with booster stations pumping the water into the distribution system. The remaining seven wells pump directly into the City’s distribution system. Water pumped from all of the wells has been naturally filtered as it passes through underlying aquifers of sand, gravel, and soil. This well water only requires disinfectant treatment for system distribution. The City maintains seven imported water connections to receive water through MET’s Orange County and East Orange County Feeder pipelines. These seven metered connections with a total capacity of 60,580 gallons per minute (gpm) transfer water into the City’s distribution system. System Pressures – Reducing distribution system pressures will, to a certain degree, conserve water and pumping energy by reducing leaking in water and plumbing systems, as well as reducing waste or water when turning water fixtures on and off. The City continually reviews the pressure zones to determine the feasibility of reducing system pressures by lowering settings on distribution system pressure regulators. The reviews have indicated that potential fire protection requirement deficiencies occur when pressures are reduced. Therefore, the City maintains safe yet efficient system pressures. Peak Demand – Water system demand patterns are a result of climatological, land use, sociological, and institutional factors, all of which affect the amount of water consumed. Reduction in peak demands can reduce the need for construction of new water storage and conveyance facilities and, in certain instances, the development of new water sources. The City’s computerized telemetry system allows water system operators to operate the system more efficiently through the ability to stage and prioritize water production facilities usage to meet these ever-changing demand patterns. The system connections and water volume supplied are summarized in Table 3-1. Table 3-1: Retail Only: Public Water Systems DWR Submittal Table 2-1 Retail Only: Public Water Systems Public Water System Number Public Water System Name Number of Municipal Connections 2020 Volume of Water Supplied 2020 CA3010038 City of Santa Ana 45,037 33,489 TOTAL 45,037 33,489 NOTES: Climate The City is located within the SCAB that encompasses all of OC, and the urban areas of Los Angeles, San Bernardino, and Riverside counties. The SCAB climate is characterized by Southern California’s “Mediterranean” climate: a semi-arid environment with mild winters, warm summers, and moderate rainfall. Local rainfall has limited impacts on reducing water demand in the City, except for landscape irrigation demand. Water that infiltrates into the soil may enter groundwater supplies depending on the local geography. However, due to the large extent of impervious cover in Southern California, rainfall runoff