Depletion of groundwater is accelerating in California's CentralValley, study finds NatureComms
), during which we found higher groundwater loss rates of 76.1 ± 28.1 mm/yr in the Sacramento basin compared to those of 38.1 ± 25.2 and 60.1 ± 14.0 mm/yr for the San Joaquin and Tulare basins, respectively.
The deseasonalized GRACE/FO-derived groundwater storage and observed water table anomalies are compared for each of the three basins. Similar to the approach for the whole Central Valley, wells with available measurements within a particular basin boundary were averaged to represent the water table depth variation for the basin .
While the Sacramento and Tulare basins showed generally good agreement between GRACE/FO-derived groundwater storage changes and observed well measurements, less correspondence was observed in the San Joaquin basin, particularly during the 1st drought period. However, the two drought phases from 2011–2017 and after 2019 are clearly recognizable, with water table observations falling in response to increased groundwater pumping.
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