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The drainage into the Pacific Ocean from the San Gabriel River Basin boundary to the Moro Canyon drainage boundary near Laguna Beach, California. Los Angeles County, Orange County: 2,680 sq mi (6,900 km 2) HUC180202: 180703 Laguna–San Diego Coastal water resource basin
California groundwater basins, subbasins, and hydrologic regions. The California Department of Water Resources recognizes 10 hydrologic regions and three additional drainage areas within the U.S. state of California. The hydrologic regions are further subdivided into 515 groundwater basins. [1]
California region, with its 10 4-digit subregion hydrologic unit boundaries. The California water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey in the United States hydrologic unit system, which is used to divide and sub-divide the United States into successively smaller hydrologic units.
Farther west lies the border with San Diego County and to the south the international boundary between the US state of California and Baja California, Mexico. To the north is the boundary with Riverside County and the Coachella Valley , which with the Imperial Valley form the "Cahuilla Basin" or the " Salton Trough ".
Tile drainage is a form of agricultural drainage system that removes excess sub-surface water from fields to allow sufficient air space within the soil, proper cultivation, and access by heavy machinery to tend and harvest crops.
Septic drain fields, also called leach fields or leach drains, are subsurface wastewater disposal facilities used to remove contaminants and impurities from the liquid that emerges after anaerobic digestion in a septic tank. Organic materials in the liquid are catabolized by a microbial ecosystem. A septic drain field, a septic tank, and ...
Map of a well field for subsurface drainage with radial flow across concentrical cylinders representing the equipotentials. Both systems serve the same purposes, namely water table control and soil salinity control. Both systems can facilitate the reuse of drainage water (e.g. for irrigation), but wells offer more flexibility.
The California Water Documents collection in the Claremont Colleges Digital Library is a valuable online resource of archived materials related to California's water history. Additionally, the collection has digitized materials relating to the creation and operation of both the Central Valley Project and the California State Water Project as ...