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The pieces include units that drain to segments of streams, remnant areas, noncontributing areas, and coastal or frontal units that can include multiple watersheds draining to an ocean or large lake. Hence, half or more of the hydrologic units are not watersheds as the name of the framework Watershed Boundary Dataset (WBD) implies.
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]
Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin. It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.
The southern part of the watershed, drained by the San Jacinto River into Lake Elsinore and via Temescal Creek into the Santa Ana River, constitutes some 45% of the total area and extend its boundaries as far south as the Colorado Desert at Anza-Borrego Desert State Park. The river has over 50 named tributaries, most of which are intermittent ...
Cottonwood Creek is a major stream and tributary of the Sacramento River in Northern California.About 68 miles (109 km) long measured to its uppermost tributaries, the creek drains a large rural area bounded by the crest of the Coast Ranges, traversing the northwestern Sacramento Valley before emptying into the Sacramento River near the town of Cottonwood.
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The Calero Reservoir. The Guadalupe River watershed consists of 170 square miles (400 km 2) of land within northern California's Santa Clara County.The surface runoff from this area drains into the Guadalupe River, its tributary streams, reservoirs or other bodies of water which all eventually gets carried into the San Francisco Bay (indicated below, with surrounding counties in red).
Stony Creek is a 73.5-mile (118.3 km)-long [2] tributary of the Sacramento River in Northern California.It drains a watershed of more than 700 square miles (1,800 km 2) on the west side of the Sacramento Valley in Glenn, Colusa, Lake and Tehama Counties.