User:Jengod/Aquifer

The South Coast hydrologic region of California, as identified by the California Department of Water Resources is about 11100 mi2, and includes all of Orange County, major portions of Los Angeles, Riverside, San Bernardino, San Diego, and Ventura counties, and a small portion of Santa Barbara County.

Significant geographic features include the Transverse Ranges and the Peninsular Ranges. Major rivers in the region include the Los Angeles River, San Gabriel, San Diego, San Luis Rey, Santa Ana, Santa Clara, Santa Margarita, and Ventura.

The climate in the region ranges from Mediterranean to subtropical steppe. Annual precipitation in the region ranges from more than 40 in in the mountains to less than 10 in in some valleys, with an overall average of 17.6 in for the region.

Alluvial groundwater basins in the South Coast hydrologic region

An alluvial groundwater basin is essentially the top level of an aquifer, above less-permeable rocks below, such as like limestone and shale. (Alluvium is loose clay, silt, sand, or gravel that has been deposited by running water in a stream bed, on a floodplain, in an alluvial fan or beach, or in similar settings. )

References

See also


 * Southern California Coastal water resource subregion
 * Aquifers in California

References