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The newer delineation work on watersheds and subwatersheds was done using 1:24,000 scale maps and data. As a result, the subbasin boundaries were changed and adjusted in order to conform to the higher resolution watersheds within them. Changes to subbasin boundaries resulted in changes in area sizes.
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.
San Diego Bay watershed (6 P) San Francisco Bay watershed (6 C, 14 P) T. Tulare Basin watershed (3 C, 20 P) Pages in category "Watersheds of California"
Basin HUC [3] Basin name [3] Basin description [3] Basin location [3] Basin size [3] Basin map 18070201 Seal Beach subbasin: Also known as the Anaheim Bay–Huntington Harbor watershed; includes municipality drainages from Anaheim, Cypress, Fountain Valley, Garden Grove, Huntington Beach, Los Alamitos, Santa Ana, Seal Beach, Stanton, and Westminster; drains into Bolsa Chica Ecological Reserve ...
In another region, the Delta-Mendota subbasin, 23 separate local agencies recently got together and submitted a single plan covering the entire area, which Stork said is expected to improve ...
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]
Groundwater pumping has been causing the land to sink at a record pace in California's San Joaquin Valley. New research suggests ways of addressing the problem.
San Diego subbasin: San Dieguito Creek, Peñasquitos Creek, San Diego River, Pueblo Watershed coastal streams including Chollas Creek, Sweetwater River and reservoirs, Otay River [9] San Diego County 1,390 sq mi (3,600 km 2) 18070305 Cottonwood–Tijuana subbasin: Tijuana River (international watershed, subbasin boundary is at the border) [9]