Santa Ana water resource basin explained

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.

The Santa Ana basin is approximately 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. 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. The most significant water feature is the basin is the Santa Ana River. Secondary features include Lake Perris and Lake Elsinore.

List of subbasins of the Santa Ana basin

Basin HUC[3] Basin nameBasin descriptionBasin locationBasin sizeBasin map
18070201Also 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
18070202San Jacinto subbasinSan Jacinto River, Mystic Lake, Perris Reservoir, Lake Hemet[5] Riverside County
18070203Santa Ana subbasinSanta Ana River
largest river basin in SoCal[6]
Orange County, Riverside County, San Bernardino County
18070204Newport Bay subbasinMajor 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

See also

Notes and References

  1. Web site: USGS Water Resources: About USGS Water Resources . 2023-03-18 . water.usgs.gov.
  2. Web site: Watershed Setting . sawpa.org.
  3. Web site: National Hydropower Asset Assessment Environmental Attribution . 2016-10-12 . . 2013 . McManamay RA, Bevelhimer MS, Kao SC, Yaxing W, Martinez-Gonzalez M, Samu N.
  4. Web site: Program . H2OC Stormwater . 2022-01-28 . Watershed Appreciation – Get to Know the Anaheim Bay/Huntington Harbour Watershed . 2023-04-16 . H2OC Stormwater Program . en-US.
  5. Web site: Tetra Tech . 2010 . San Jacinto Watershed Model Update - Final .
  6. Web site: Santa Ana Watershed and Water Quality . 2023-04-16 . Riverside-Corona Resource Conservation District . en.
  7. Web site: Central OC Watershed Management Area OC Watersheds California . 2023-04-16 . ocerws.ocpublicworks.com . en.

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