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2015 URBAN WATER MANAGEMENT PLAN <br />2.2.1 Climate Characteristics <br />The City is located within the South Coast Air Basin (SCAB) that encompasses all of Orange County, and <br />the urban areas of Los Angeles, San Bernardino, and Riverside counties. The SCAB climate is <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 />Metropolitan's water supplies come from the State Water Project (SWP) and the Colorado River Aqueduct <br />(CRA), influenced by climate conditions in northern California and the Colorado River Basin, respectively. <br />Both regions have been suffering from multi -year drought conditions with record low precipitation which <br />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 since the 2010 UWMP. Vacant land within the City is very <br />limited while existing housing is becoming denser and new residential units are multi- storied. Table 2 -1 <br />shows the population projections in five -year increments out to 2040 within the City's service 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 />arcadis.com 75E-22 2-2 <br />