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California groundwater basins, subbasins, and hydrologic regions. The California Department of Water Resources recognizes 10 hydrologic regions and three additional drainage areas within the U.S. state of California. The hydrologic regions are further subdivided into 515 groundwater basins. [1]
California region, with its 10 4-digit subregion hydrologic unit boundaries. The California water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey in the United States hydrologic unit system, which is used to divide and sub-divide the United States into successively smaller hydrologic units.
The Sacramento River (Spanish: Río Sacramento) is the principal river of Northern California in the United States and is the largest river in California. [9] Rising in the Klamath Mountains , the river flows south for 400 miles (640 km) before reaching the Sacramento–San Joaquin River Delta and San Francisco Bay .
At Sacramento, American River water stored by Folsom Dam is added. 2.5 million acre-feet (3.1 km 3) are annually pumped from the Delta into the Delta-Mendota Canal. New Melones Dam on the Stanislaus River was finished in 1979, and the reservoir was filled in 1982.
The San Joaquin River throughout most of the Delta and the lower Sacramento River below its connection to the Sacramento Deep Water Ship Channel are routinely dredged to allow the passage of large cargo ships. The Sacramento River corridor has been maintained to a depth of 7 ft (2.1 m) as early as 1899, and was deepened to 30 ft (9.1 m) in 1955.
The Greater Sacramento area refers to a metropolitan region in Northern California comprising either the U.S. Census Bureau defined Sacramento–Roseville–Arden-Arcade metropolitan statistical area or the larger Sacramento–Roseville combined statistical area, the latter of which consists of seven counties, namely Sacramento, Yolo, Placer, El Dorado, Sutter, Yuba, and Nevada counties.
The Sacramento Weir is opened manually when the Sacramento River reaches 27.5 feet (8.4 m) at the I Street Bridge. It was built in 1916 by the City of Sacramento and contains 48 gates over its 1,920-foot (590 m) length; water from the Sacramento Weir flows through the 1 mile (1.6 km) long Sacramento Bypass and drains into the Yolo Bypass. [ 6 ]
The reservoir would hold about 1.8 million acre-feet (2.2 km 3) of water to be released into the Sacramento River during low-flow periods, boosting the water supply available for SWP entitlement holders and improving water quality in the Sacramento–San Joaquin Delta. This project has previously arisen in several forms, including proposals for ...