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| Kern County Water Bank | |
|---|---|
| Name | Kern County Water Bank |
| Location | Kern County, California |
| Type | Water banking facility |
| Coordinates | 35°22′N 119°02′W |
| Operator | Kern County Water Agency; The Metropolitan Water District of Southern California (participants) |
| Established | 1990s (expanded 2000s) |
| Capacity | ~1,000,000 acre-feet (variable estimates) |
Kern County Water Bank is a large managed aquifer recharge and groundwater storage project in Kern County, California within the southern San Joaquin Valley. It functions as a strategic underground reservoir that receives flood flows, surface diversions, and transferred water from several state and federal projects. The facility plays a central role in regional water supply reliability for urban and agricultural interests, linking local districts, state agencies, and water contractors.
The concept emerged from groundwater overdraft crises in the San Joaquin Valley during the mid-20th century and policy shifts following the 1977 California Groundwater Management Act era. Early planning involved stakeholders such as the Kern County Water Agency, Semitropic Water Storage District, and Cawelo Water District, with technical input from the U.S. Bureau of Reclamation and California Department of Water Resources. Major construction and expansion phases occurred in the 1990s and 2000s, tied to water transfers from the Central Valley Project and the State Water Project, and influenced by litigation and agreements like those involving Friant Water Users Authority and water rights claimants. Collaborative programs with The Metropolitan Water District of Southern California and Santa Clara Valley Water District helped finance conveyance and recharge infrastructure.
Physical elements include infiltration basins, recharge ponds, conveyance channels, monitoring wells, and recharge galleries designed by firms and agencies such as the U.S. Geological Survey and consulting engineers contracted by Kern County. Conveyance relies on connections to the California Aqueduct, local canals, and pump stations tied to the Friant-Kern Canal and exchange agreements with districts like Semitropic Water Storage District. Operations are coordinated through water transfer contracts, scheduled recharge seasons, and managed extraction via designated extraction wells. Monitoring networks integrate data from the California State Water Resources Control Board and Department of Water Resources databases, with groundwater level and quality surveillance conducted by local water districts and research partners including University of California, Davis.
Recharge sources encompass flood pulses from the Kern River, surplus deliveries from the State Water Project, groundwater substitution transfers from districts such as Semitropic, and purchases from municipal suppliers like Los Angeles Department of Water and Power. Managed aquifer recharge practices include percolation through basins, in-lieu recharge via surface water deliveries to farms, and direct injection in some pilot studies. Allocation and accounting use metering, water year classifications following Drought Contingency Plan practices, and groundwater banking agreements modeled after contracts used by The Metropolitan Water District of Southern California and other major water contractors.
Recharge operations affect Tulare Basin hydrology, groundwater-dependent ecosystems, and riparian corridors along the Kern River. Positive effects include mitigation of land subsidence documented by NASA remote sensing and support for groundwater-dependent habitats noted by California Department of Fish and Wildlife. Concerns involve mobilization of naturally occurring contaminants such as arsenic, impacts on endemic species protected under the Endangered Species Act, and changes to surface water-groundwater interactions that influence wetlands in areas like Kern National Wildlife Refuge. Environmental review processes have referenced studies by Scripps Institution of Oceanography and the U.S. Fish and Wildlife Service.
The bank operates within a web of water law and institutions including adjudicated groundwater basins overseen by local groundwater sustainability agencies formed under the Sustainable Groundwater Management Act (SGMA), contracts with state and federal projects like the Central Valley Project, and permits from the State Water Resources Control Board. Institutional participants include the Kern County Water Agency, multiple water districts, and state contractors such as The Metropolitan Water District of Southern California. Dispute resolution has involved courts that interpret water rights and contractual obligations, and coordination occurs through forums such as regional groundwater sustainability agencies and multi-party water transfer agreements.
The bank underpins irrigated agriculture across Kern County and the broader San Joaquin Valley, supporting crops marketed by companies and cooperatives in the region. By providing seasonal and long-term storage, it reduces reliance on surface deliveries and buffers against droughts, thereby stabilizing commodity production for growers represented by organizations like the California Farm Bureau Federation and Western Growers. Economic analyses by agencies such as the California Economic Development Department and consultants for water districts highlight benefits in avoided pumping costs, reduced land subsidence damages impacting infrastructure, and enhanced municipal supply reliability for urban partners like The Metropolitan Water District of Southern California.
Future directions include expanded recharge capacity, integration with groundwater sustainability plans under SGMA, improved water accounting using advanced monitoring from the U.S. Geological Survey and satellite observations from NASA, and potential adaptations to climate-change-driven hydrologic variability assessed by the Intergovernmental Panel on Climate Change. Challenges encompass securing reliable water supplies for recharge amid competing demands, addressing environmental compliance with the Endangered Species Act and state water quality standards, mitigating subsidence, and navigating complex multi-jurisdictional governance involving local districts, state agencies, and federal contractors.
Category:Water infrastructure in California Category:San Joaquin Valley Category:Groundwater recharge