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T HE W ARNER P ROJECT
<br />W ATER S UPPLY A SSESSMENT A UGUST 21, 2020
<br />F USCOE E NGINEERING , I NC. 21
<br />Table 8 Metropolitan Multiple Climate Scenario Water Supply Capability and Projected
<br />Demands Comparison from 2020-2040 (AF)
<br />Forecast Year 2020 2025 2030 2035 2040
<br />Normal Year
<br />Capability of Current Supply 3,448,000 3,550,000 3,658,000 3,788,000 3,824,000
<br />Total Demands 1,860,000 1,918,000 1,959,000 2,008,000 2,047,000
<br />Supply Programs Under
<br />Development 63,000 100,000 386,000 428,000 468,000
<br />Total Potential Surplus 1,651,000 1,732,000 2,085,000 2,208,000 2,245,000
<br />Single -Dry Year
<br />Capability of Current Supply 2,584,000 2,686,000 2,775,000 2,905,000 2,941,000
<br />Total Demands 2,005,000 2,066,000 2,108,000 2,160,000 2,201,000
<br />Supply Programs Under
<br />Development 63,000 100,000 316,000 358,000 398,000
<br />Total Potential Surplus 642,000 720,000 983,000 1,103,000 1,138,000
<br />Multiple-Dry Year
<br />Capability of Current Supply 2,103,000 2,154,000 2,190,000 2,242,000 2,260,000
<br />Total Demands 2,001,000 2,118,000 2,171,000 2,216,000 2,258,000
<br />Supply Programs Under
<br />Development 43,000 80,000 204,000 245,000 286,000
<br />Total Potential Surplus 145,000 116,000 223,000 271,000 288,000
<br />Source: 2015 Metropolitan UWMP
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<br />The findings of the 2015 Metropolitan UWMP highlight that Metropolitan has supply capabilities
<br />that would be sufficient to meet expected demands from 2020 through 2040 under the normal,
<br />single dry-year and multiple dry-year conditions. Metropolitan also has proposed programs in
<br />place to ensure against water shortages in the future. These programs include projects along
<br />the California Aqueduct and the Colorado River Aqueduct in addition to demand reduction
<br />projects. In all climate scenarios, Metropolitan estimates potential surpluses in water supply
<br />through 2040.
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<br />The Metropolitan 2015 UWMP was made public in early 2016 and shared with Metropolitan’s
<br />member agencies. Once these findings were finalized, the Metropolitan member agencies
<br />could conclude their own 2015 UWMP findings. The City of Santa Ana published their 2015
<br />UWMP in April 2016 after determining Metropolitan would be able to meet the City’s imported
<br />water demands through 2040. The City of Santa Ana and OCWD local water supply reliability
<br />is summarized below.
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<br />4.2 OCWD AND CITY OF SANTA ANA LOCAL WATER SUPPLY RELIABILITY
<br />Like Metropolitan, the City of Santa Ana is also required to assess the reliability of their water
<br />service to its customers under normal, single-dry and multiple-dry water years. As mentioned
<br />the City depends on a combination of imported water from Metropolitan and local groundwater
<br />supplies to meet its water demands. The City has taken numerous steps to ensure it has
<br />adequate supplies to provide for growing demands.
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