Santa Ana water resource basin

Santa Ana water resource basin (HUC 180702) is one of three hydrologic basins within the Southern California Coastal water resource subregion and is one of approximately 2,200 water resource basins in the United States hydrologic unit system. The Santa Ana water resource basin is a third-level subdivision of the United States hydrologic unit system.[1]

Santa Ana water resource basin has four water resource subbasins

The Santa Ana basin is approximately 2,680 sq mi (6,900 km2; 1,720,000-acre) and includes the drainage into the Pacific Ocean from the San Gabriel boundary to the Moro Canyon drainage boundary near Laguna Beach.[1] The Santa Ana basin is composed of four fourth-level hydrological units called water resource subbasins (formerly known as water resource cataloging units), each with its own 8-digit hydrologic unit code.[1] The Santa Ana water resource basin is home to approximately 6 million people.[2] The Santa Ana Integrated Regional Water Management Region and Santa Ana Watershed Project Authority oversee water systems in the basin.[2] The most significant water feature is the basin is the Santa Ana River. Secondary features include Lake Perris and Lake Elsinore.[2]

List of subbasins of the Santa Ana basin
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 and Seal Beach National Wildlife Refuge[4] Orange County 90 sq mi (230 km2)
USGS hydrologic unit 18070201 boundary map
18070202 San Jacinto subbasin San Jacinto River, Mystic Lake, Perris Reservoir, Lake Hemet[5] Riverside County 757 sq mi (1,960 km2)
USGS hydrologic unit 18070202 boundary map
18070203 Santa Ana subbasin Santa Ana River; largest river basin in SoCal[6] Orange County, Riverside County, San Bernardino County 1,680 sq mi (4,400 km2)
USGS hydrologic unit 18070203 boundary map
18070204 Newport Bay subbasin Major watercourses are San Diego Creek and Santa Ana Delhi Channel; also known as the Central Orange County watershed; drains municipalities of Irvine, Newport Beach, Tustin, and partial drainage of Costa Mesa, Laguna Hills, Lake Forest, Orange, and Santa Ana[7] Orange County 154 sq mi (400 km2)
USGS hydrologic unit 18070204 boundary map

See also

References
  1. "USGS Water Resources: About USGS Water Resources". water.usgs.gov. Retrieved 2023-03-18.
  2. "Watershed Setting" (PDF). sawpa.org.
  3. 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.
  4. Program, H2OC Stormwater (2022-01-28). "Watershed Appreciation – Get to Know the Anaheim Bay/Huntington Harbour Watershed". H2OC Stormwater Program. Retrieved 2023-04-16.
  5. Tetra Tech (2010). "San Jacinto Watershed Model Update - Final" (PDF).
  6. "Santa Ana Watershed and Water Quality". Riverside-Corona Resource Conservation District. Retrieved 2023-04-16.
  7. "Central OC Watershed Management Area | OC Watersheds California". ocerws.ocpublicworks.com. Retrieved 2023-04-16.
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