San Joaquin Valley – Tulare Lake
- Basin Name
- San Joaquin Valley – Tulare Lake
- Basin Number
- SGMA Basin Priority
- Critically Overdrafted
- Subject to SGMA
- DWR Region & POC
South Central Region Office
- Number of Wells
- Hydrologic Region Name
- Tulare Lake
Located in California’s Tulare Lake hydrologic region, the San Joaquin Valley – Tulare Lake is 535,869 acres in size. This High priority basin is home to an estimated 535,870 people (2010 value), which have been at a rate of 40.13. San Joaquin Valley – Tulare Lake is a(n) basin with approximately 3906 wells, of which approximately 75 are water supply wells. Groundwater accounts for approximately 50.33 percent of the basin’s water supply.
2014: CASGEM basin prioritization – high. Comments: Subsidence, overdraft, water quality degradation
2018: Draft priority – high. Groundwater level, salt intrusion, subsidence comments:
- CRITICAL OVERDRAFT 2016. 1) CASGEM/WDL/GWIDS: Longterm hydrographs show groundwater level decline. Source: DWR 2) Arid conditions and early agricultural development (pre-1900s) in the Tulare Lake Hydrologic Region have caused groundwater level declines, which have resulted in stream-aquifer dynamics. Under predevelopment conditions, groundwater-surface water interactions were very dynamic and depended on hydrologic conditions. Rapid growth in the agricultural sector in the Tulare Lake Hydrologic Region has resulted in groundwater development with increased groundwater pumping and subsequent groundwater level declines. In some areas of critical overdraft, such as in Kings and Kern counties, complete disconnection between groundwater and overlying surface water systems has occurred. Source: US Bureau of Reclamation, Program Draft EIR/EIS, 2011
- 1) High groundwater salinity occurs in many locations in the Tulare Lake Area. Salts are imported into the Tulare Lake Area through irrigation with Delta water and salts added through application of fertilizers, and other salt containing materials. Except in very wet years, the Tulare Lake Area has no natural drainage, so imported salts accumulate in the groundwater unless captured and sequestered. This salt accumulation causes groundwater quality degradation for potable and agricultural uses.
- To the high nitrate and salinity problems, the Central Valley Salinity Alternatives for Long-Term Sustainability (CV-Salts) was formed as a strategic initiative to address accumulation of salts and nitrates throughout the region in a comprehensive, consistent and sustainable manner (CVRWQCB 2015; SWRCB 2015). Source: Coordinated Long-Term Operation of the Central Valley Project and State Water Project, USBR, Chapter 7. Technical studies show that current salinity management activities may only address about 15% of the annual salt load in the Central Valley Region. Accordingly, long-term solutions, including development of regional de-salters, a regulated brine line, or other projects that would allow containment or removal of salt, are needed to address the other 85%. These long-term management solutions will require significant state and federal funding to implement. Source: CV Salts Draft Salinity Management Strategy. 3) Some of the most advanced salt management techniques are being employed in the Central Valley to manage salt in the Tulare Lake Basin and other areas in the San Joaquin Valley. These solutions include: On-farm water reuse and salt precipitation, Reverse osmosis concentration and truck disposal to existing ocean outfalls, Brine reinjection into oil extraction areas, Water management and source water replacement, Current source control for salts going into the domestic sewers. Source: Central Valley Waterboard
- Sources: 1) Current Land Subsidence in the San Joaquin Valley, USGS; 2) 2014 – Land Subsidence from Groundwater Use in California, California Water Foundation / James W. Borchers / Michael Carpenter, Luhdorff & Salmanini, April 2014; 3) Progress Report: Subsidence in the Central Valley, California, Jet Propulsion Laboratory, California Institute of Technology, NASA 2015-16
2018 Final Basin Prioritization: Basin priority remains unchanged at high priority.