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2015 URBAN WATER MANAGEMENT PLAN <br />characterized by southern California's "Mediterranean" climate: a semi -arid environment with mild winters, <br />warm summers and moderate rainfall. <br />Local rainfall has limited impacts on reducing demand for the City. Water that infiltrates into the soil may <br />enter groundwater supplies depending on the local geography. However, due to the large extent of <br />impervious cover in southern California, rainfall runoff quickly flows to a system of concrete storm drains <br />and channels that lead directly to the ocean. OCWD is one agency that has successfully captured <br />stormwater along the Santa Ana River and in recharge basins for years and used it as an additional <br />source of supply for groundwater recharge. <br />The City's imported water supplies from the State Water Project (SWP) and the Colorado River Aqueduct <br />(CRA) are influenced by climate conditions in northern California and the Colorado River Basin, <br />respectively. Both regions have been suffering from multi -year drought conditions with record low <br />precipitation which directly impact water supplies to southern California. <br />2.2.2 Demographics <br />The City has a 2015 population of 335,299 according to the California State University at Fullerton's <br />Center of Demographics Research (CDR). The City is almost completely built -out, and its population is <br />projected to increase only 0.9 percent by 2040, representing an average growth rate of 0.005 percent <br />every five years. <br />Growth projections have decreased slightly from the 2010 UWMP projections. Vacant land within the City <br />is very limited while existing housing is becoming denser and new residential units are multi -storied. <br />Table 2-1 shows the population projections in five-year increments out to 2040 within the City's service <br />area. <br />Table 2-1: Population — Current and Projected <br />2.2.3 Land Use <br />The City's service area can best be described as a predominately residential single and multi -family <br />community located in central Orange County. <br />2.3 Water Use by Customer Type <br />An agency's water consumption can be projected by understanding the type of use and customer type <br />creating the demand. Developing local water use profiles helps to identify quantity of water used as well <br />as when, where, how, and by whom water is used within the agency's service area. A comprehensive <br />arcadis.com RX-22 2-2 <br />