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ELAN PROJECT <br />WATER SUPPLY ASSESSMENT <br />NOVEMBER 2, 201 <br />Table 5 2015 Projected and Actual Water Supply and Demand (Acre-feet) <br />Land Use Type <br />YP <br />2010 UWMP Projected 2015 <br />Demand <br />Actual 2015 Demand <br />Single Family <br />18,368 <br />14,084 <br />Multi -Family <br />13,563 <br />10,399 <br />Other (CII) <br />15,684 <br />12,025 <br />Landscape <br />185 <br />147 <br />Total <br />47,800 <br />36,656 <br />Notes: <br />Source: 2010 and 2015 City of Santa Ana UWMPs <br />As shown in Table 5 above, there was a decrease in water supplied to the City in 2015 as to <br />what was predicted to be delivered in the 2010 UWMP (47,800 AF) by approximately 23%. <br />This is likely due to Senate Bill (SB) x7.7 which requires the State of California to reduce urban <br />water use by 20% by the year 2020 as described in more detail below. Similarly, the Executive <br />Order mandated by California Governor Edmund Brown in April 2015 in response to the recent <br />drought further required a collective reduction in statewide urban water use of 25%which would <br />also reduce Citywide demands. In addition, UWMPs are typically developed in a conservative <br />manner and tend to overestimate future water demands. <br />Currently, 71% of the City's water supply is from OC Basin groundwater, 28% is from <br />Metropolitan imported water and 1 % is from recycled water. The City's water supply portfolio <br />is expected to change slightly to 70% from OC Basin groundwater, 29% from Metropolitan <br />imported water, and 0.7% recycled water by the year 2040 as discussed in more detail <br />throughout this WSA. Additional details on the strategic management of these resources is <br />explained below. <br />OCWD Groundwater <br />The primary source of water for the City is the Orange County Groundwater Basin ("OC Basin") <br />which is managed by the Orange County Water District (OCWD). The OC Basin underlies the <br />north half of Orange County beneath broad lowlands. The OC Basin covers an area of <br />approximately 350 square miles, bordered by the Coyote and Chino Hills to the north, the Santa <br />Ana Mountains to the northeast, the Pacific Ocean to the southwest, and terminates at the <br />Orange County line to the northwest, where its aquifer systems continue into the Central Basin <br />of Los Angeles County. <br />The OC Basin storage capacity is estimated to be 66 million AF^, of which only a fraction is <br />available for use to prevent against physical damage to the Basin such as seawater intrusion or <br />land subsidence. To ensure the Basin is not overdrawn, OCWD recharges the Basin with local <br />and imported water. The Basin is recharged primarily by four sources including local rainfall, <br />storm and base flows from the Santa Ana River ISAR), purchased Metropolitan imported water; <br />and highly treated recycled wastewater. Basin recharge occurs largely in the following recharge <br />basins that are located in or adjacent to the City of Anaheim: <br />Warner Basin: A 50-foot-deep recharge basin located next to the SAR at the intersection <br />of the 55 and 91 freeways; <br />4 OCWD Groundwater Management Plan 2015 Update. June 17, 2015. <br />FUSCOE ENGINEERING, INC. 13 <br />