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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
Groundwater recharge projects are expected to increase in number in future years throughout California due to the comparatively low cost and massive storage capabilities of aquifers. The total volume of groundwater capacity is estimated to be 850 million acre-feet, while there is only around 50 million acre-feet of available surface freshwater ...
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]
Otay Valley groundwater basin: 9-18 6,830 1,000 185 Tijuana groundwater basin: 9-19 7,410 2,000 350 Batiquitos Lagoon Valley groundwater basin: 9-22 741 Batiquitos Lagoon: San Elijo Valley groundwater basin: 9-23 883 1,800 Pamo Valley groundwater basin: 9-24 1,500 Ranchita Town Area groundwater basin: 9-25 3,130 125 22 Cottonwood Valley ...
In a new study, scientists begin to map underground channels that are optimal areas for recharging California's groundwater in the Central Valley.
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.
Excessive groundwater pumping has long been depleting aquifers in California's Central Valley. Now, scientists say the depletion is accelerating.
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'