Southern California Coastal water resource subregion

Southern California Coastal water resource subregion (HUC 1807) is one of 10 hydrologic subregions within the California water resource region and is one of 222 water resource subregions in the United States hydrologic unit system. The Southern California coastal subregion, sometimes called the South Coast Hydrologic Subregion, is a second-level subdivision[1] covering is approximately 11,000 sq mi (28,000 km2; 7,000,000-acre) and extends from Rincon Creek on the north to the international border with Mexico on the south.[2] The South Coast Hydrologic Subregion is composed of three third-level hydrological units. The federally-defined Southern California Coastal water resource subregion equates roughly with the state-designated South Coast hydrologic region. Per a USGS report of 1976, "Water deficiency is prevalent in the South Coastal subregion."[3] By 1955 the region was found to be experiencing measurable levels of saltwater intrusion due to overdrawn aquifers and several wells were abandoned as a consequence.[3] Part of the solution was injecting Colorado River water from the aqueduct into local wells to defend against the salted water, a practice called artificial recharge.[3]

Water resource basins of the Southern California coastal subregion (HUC 1807)

List of Southern California Coastal subregion basins
Basin HUC[4] Basin name[4] Basin description Basin location[4] Basin size[4] Basin map
180701 Ventura–San Gabriel Coastal water resource basin The drainage into the Pacific Ocean from the Rincon Creek Basin boundary to and including the San Gabriel River Basin.[5] Ventura County, Los Angeles County 4,530 sq mi (11,700 km2)
HUC180201
HUC180201
180702 Santa Ana water resource basin 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 km2)
HUC180202
HUC180202
180703 Laguna–San Diego Coastal water resource basin The drainage within the United States that discharges into the Pacific Ocean from and including the Moro Canyon drainage basin near Laguna Beach to the California–Baja California international boundary Orange County, San Diego County 3,860 sq mi (10,000 km2)
HUC180203
HUC180203

See also

References
  1. "Hydrologic Unit Maps". USGS. Retrieved 2016-10-12. Public Domain This article incorporates text from this source, which is in the public domain.
  2. "Boundary Descriptions and Names of Regions, Subregions, Accounting Units and Cataloging Units from the 1987 USGS Water-Supply Paper 2294". USGS Water Resources. Retrieved 2023-03-18.
  3. Summary Appraisals of the Nation's Ground-Water Resources-California Region GEOLOGICAL SURVEY PROFESSIONAL PAPER 813-E, https://pubs.usgs.gov/pp/0813e/report.pdf
  4. McManamay RA, Bevelhimer MS, Kao SC, Yaxing W, Martinez-Gonzalez M, Samu N (2013). "National Hydropower Asset Assessment Environmental Attribution". USGS-Oak Ridge National Laboratory. Retrieved 2016-10-12. Public Domain This article incorporates text from this source, which is in the public domain.
  5. Codes for the identification of hydrologic units in the United States (PDF). National Institute of Standards. pp. A109–A110.
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