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The 10-digit watersheds were delineated to be between 40,000 and 250,000 acres in size, and the 12-digit subwatersheds between 10,000 and 40,000 acres. [5] In addition to the hydrologic unit codes, each hydrologic unit was assigned a name corresponding to the unit's principal hydrologic feature or to a cultural or political feature within the ...
Subsequently every watershed along this coast is assigned a number using the Pfafstetter Coding System. This implies that the four largest watersheds are selected and receive numbers 2,4,6, or 8. The watersheds in between the large systems receive numbers 3, 5, and 7. Numbers 1 and 9 are used for the small watersheds on the edges of the strait.
The Ventura–San Gabriel Coastal basin is composed of seven fourth-level hydrological units called water resource subbasins (formerly known as water resource cataloging units), each with its own 8-digit hydrologic unit code. Water in this basin is overseen by the Greater Los Angeles County Integrated Water Management Region, the Upper Santa ...
The Santa Ana water resource basin is a third-level subdivision of the United States hydrologic unit system. [ 1 ] The Santa Ana basin is approximately 2,680 sq mi (6,900 km 2 ; 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 ]
According to the USGS watershed classification system, the Klamath Watershed is a 6-digit, level 3 Accounting Unit within Region 18, known as the California watershed region. [18] The accounting unit of the Klamath Watershed is 180102 and includes twelve 8-digit Hydrologic Units (HUCs) covering 9.4 million acres. [19]
The Mid Atlantic region, which is listed with a 2-digit hydrologic unit code (HUC) of 02, has an approximate size of 106,334 square miles (275,400 square kilometers), and consists of 8 subregions, which are listed with the 4-digit HUCs 0201 through 0208.
[3] The Northern Mojave–Mono Lake subregion is composed of two third-level hydrological units called water resource basins (formerly accounting units), each with its own 6-digit hydrologic unit code. These two basins are further subdivided into a total of 11 water resource subbasins, each with its own 8-unit hydrologic code.
The Upper Colorado region, which is listed with a 2-digit hydrologic unit code (HUC) of 14, has an approximate size of 113,347 square miles (293,570 square kilometers), and consists of 8 subregions, which are listed with the 4-digit HUCs 1401 through 1408.