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

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Santa Ana 2020 Urban Water Management Plan arcadis.com 3-7 quickly flows to a system of concrete storm drains and channels that lead directly to the ocean. OCWD is one agency that has successfully captured stormwater along the Santa Ana River and in recharge basins for years and used it as an additional source of supply for groundwater recharge. Based on the 2017 Basin 8-1 Alternative Plan, OCWD captured an average annual stormwater volume of approximately 44,000 AF over the period of ten years, from Water Year 2006-07 to 2015-16; however, this period’s rainfall was 17% below the long term average using San Bernardino precipitation data. Based on a longer period (1989-2015) of rainfall and captured stormwater records, the average year water budget of OCWD assumes a stormwater capture volume of 52,000 AF. Population, Demographics, and Socioeconomics 3.4.1 Population According to CDR, the City’s service area has a 2020 population of 335,086, a decrease from the 2015 population of 338,336. Overall, the population increases with a moderate growth of 2.9% over the 25-year period from 2020 to 2045. The growth is slightly higher in the first 15 years until 2035 and tapered off from there. Table 3-2 shows the population projections in five-year increments out to 2045 within the City’s service area. Table 3-2: Retail: Population - Current and Projected DWR Submittal Table 3-1 Retail: Population - Current and Projected Population Served 2020 2025 2030 2035 2040 2045(opt) 335,086 343,358 347,511 347,952 347,785 345,018 NOTES: Source - Center for Demographic Research at California State University, Fullerton, 2020 3.4.2 Demographics and Socioeconomics As shown in Table 3-3 below, the total number of dwelling units in the City is expected to increase by 4.6% in the next 25 years from 78,650 in 2020 to 82,243 in 2045. Table 3-3 also shows a breakdown of the total dwelling units by type for the 25-year period from 2020 to 2045.