The Antelope Valley-East Kern Water Agency (AVEK) area, most of which is within the Mojave Desert region of southern California, lacks adequate water resources to sustain the existing rate of ground-water pumpage for irrigation, industrial, and domestic use. However, by 1972 the California Aqueduct, a part of the California Water Plan, will be completed and will begin to convey water from northern California into the area.The chief economic pursuits in the area are irrigated agriculture and poultry production. At present, the major industries are related to national defense and mining. In the future, industry will increase and probably become the major economic activity.The Mojave Desert region, part of which lies within the AVEK area, is characterized by fault-block mountains and fault-block basins. The Tehachapi and San Gabriel Mountains are the major bordering fault blocks. The adjacent lowland areas of Antelope and Fremont Valleys have been depressed by movements along major faults.There are two major ground-water basins in the AVEK area: Antelope Valley and Fremont Valley basins. Each large basin is divided by faults or bodies of consolidated rock into several groundwater subunits.Mean annual precipitation in the AVEK area varies geographically. About 2,500 square miles annually receives less than 10 inches of precipitation; about 930 square miles receives between 4 and 5 inches. Within a small area of the San Gabriel Mountains, the mean annual precipitation exceeds 40 inches.A large part of the streamflow into Antelope Valley is contributed by Big Rock, Little Rock, and Oak Creeks. The total average annual runoff in these three streams is estimated to be 28,000 acre-feet. Most of the streamflow entering Fremont Valley is contributed by Cottonwood Creek, Cache Creek, Redrock Wash, Pine Tree Canycn Creek, and Last Chance Creek. None of these produces significant runoff, except during short periods following winter storms or immediately after intense summer thunderstorms.The chemical quality of the ground water in the older alluvium, the principal aquifer of the area, is generally suitable for domestic, irrigation, and most industrial uses.A long-existing condition of ground-water overdraft in the AVEK area has become an increasingly serious problem as water levels in wells annually decline. Estimated average annual recharge to the Antelope Valley ground-water basin is 58,000 acre-feet, and estimated average annual recharge to the Fremont Valley ground-water basin is 18,000 acre-feet. This estimated recharge is only about 5 percent of the annual precipitation that falls on the area. For the 1949-50 growing season estimated water consumption in Antelope Vallev was 225,000 acre-feet.AVEK, which has contracted to receive imported water beginning in 1972, will provide storage facilities to meet peaking demands. Storage space is necessary for about one-fourth of the annual supply of supplemental water, or about 30,000 acre-feet. Four potential surfacereservoir sites were suggested for investigation to determine eco...