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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR <br />CITY OF SANTA ANA <br />5. Environmental Analysis <br />UTILITIES AND SERVICE SYSTEMS <br />Table 5.14 -9 Existing and Future Water Demands Based on Existing Water Usage Rates <br />Harbor Corridor Plan <br />Residential <br />Population <br />Water Usage <br />Rate (GPCD) <br />Total Daily <br />Water Usage <br />( allda ) <br />Total Demand <br />Acre-FeeLfYr <br />CII Population - Buildout (2035) <br />1,559 <br />1041, <br />162,136 <br />182 <br />Difference <br />173 <br />- <br />+17,992 <br />+20 <br />Total Project Net Increase <br />1,154 <br />Source: MWDOG_ 2013.Oranoe County Water Suodiers Watur Ratesand <br />Financiallnformaton <br />GPCD = Gallons per capita per day <br />Existing residential water use of 66 GPCD and C 1 wa&r use of 104 GPCD is from MWDOC for FY 2011 -2012. <br />b.Conservatisely assumed to be the same as existing water usage with no further conservation efforts. <br />°CII = Commercial, Industrial, and Institutional <br />As shown in Table 5.14 -9, this method of calculating water demand within the Harbor Corridor Plan area is <br />estimated to be 1,556 acre -feet per year (ACY), which is an increase of 1,154 ACY from current conditions. <br />This estimate, which is based on actual water usage rates within Santa Ana, is approximately 36 percent lower <br />than the estimate using the I JWMP baseline and projected water usage rates. <br />In order to evaluate water supply reliability, California statutes require the consideration of water supplies and <br />demands in three types of water conditions: normal, single dry, and multiple dry water years. There is no <br />statute or regulation that dictates the proper method for calculating demands in single dry and multiple dry <br />years, and no consistent approach has been developed by water professionals within the State. Consistent <br />with the 2010 i1WMP, the water demands in single dry and multiple dry years are projected to be equal to <br />demands in normal water years. <br />This is a conservative approach and overestimates water demands for the City and the project because it does <br />not take into account any water demand reductions that would be expected to occur, based on the City's <br />conservation efforts and the implementation of its Water Supplies Contingency Plan (WSCP) and Emergency <br />Water Conservation Plan (EWCP). The water demand presented in Table 5.14 -10 assumes a buildout year of <br />2035. <br />Table 5.14 -10 Normal, Single Dry; and Multiple Dry Year Demands (ACY) <br />Harbor Corridor Plan <br />Normal Year <br />Demand <br />Single Year Demand <br />Multiple Dry Year <br />Demand - Year 1 <br />Multiple Dry Year <br />Demand - Year 2 <br />Multiple Dry Year <br />Demand - Year 3 <br />Total Project Demand <br />1,154 <br />1 1,154 <br />1 1,154 <br />1,154 <br />1,154 <br />Source. Total demand at buldout calculated from Table 5.14-3. <br />Water Availability <br />A Water Supply Assessment (WSA) was prepared to assess the water demand and supply conditions with <br />implementation of the proposed Harbor Corridor Plan. As shown in Table 5.14 -9, the water demand for <br />overall buildout of the proposed project is a projected net increase of 1,154 ACY. Nearly all of the total <br />water demands (98 percent) can be attributed to residential uses. Within the context of the City of Santa <br />Ana's projected demands through 2035, the overall project demand represents just 2.3 percent of anticipated <br />Page 5.14 -16 PlaceWorkr <br />