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California aquifers, excerpted from map in Ground Water Atlas of the United States (USGS, 2000): Lavender is "other" for "rocks that generally yield less than 10 gal/min to wells"; dark green-blue (3) are the California coastal basin aquifers, bright-turquoise blue (7) is the Central Valley aquifer system, flat cobalt-blue (1) down south is Basin and Range aquifers
The Colorado River hydrologic region of California is one of the 10 major hydrologic regions of the state as identified by the California Department of Water Resources. The Colorado River hydrologic region has a surface area of about 20,000 sq mi (52,000 km 2 ), and includes all of Imperial County , and portions of Riverside , San Bernardino ...
The Colorado River Aqueduct, or CRA, is a 242 mi (389 km) water conveyance in Southern California in the United States, operated by the Metropolitan Water District of Southern California. The aqueduct impounds water from the Colorado River at Lake Havasu on the California– Arizona border, west across the Mojave and Colorado deserts to the ...
While the volume of groundwater in California is very large, aquifers can be over drafted when groundwater is removed more rapidly than it is replenished. In 1999, it was estimated that the average, annual overdrafting was around 2,200,000 acre-feet (2.7 km 3 ) across the state, with 800,000 acre-feet (0.99 km 3 ) in the Central Valley.
The latest drought, from 2020 through 2022, set a record as California’s driest three-year period on record, and state data show more than 2,600 dry wells were reported during that time.
California passed its landmark groundwater law in 2014. The goals of sustainable management remain a long way off. Despite California groundwater law, aquifers keep dropping in a 'race to the bottom'
In the early 20th century, Southern California cities were faced with a growing population and shrinking local groundwater supplies. The Metropolitan Water District of Southern California was established in 1928 under an act of the California Legislature to build and operate the 242-mile Colorado River Aqueduct (389 km) that would bring water ...
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]