Groundwater depletion in California’s Central Valley accelerates during megadrought - Nature Communications

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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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NatureComms Don't need to be a scientist well drillers could tell you you have to go deeper to get water and what years they were contracted to drill.

NatureComms Thank you for this post. Can someone PLEEEZE point me to where I can get official CA groundwater maps and data on reservoir releases for the past several years? The maps are no longer on USGS and I can't find them on CA websites anywhere.

NatureComms how does this work with supposedly rising ocean levels? what is the science behind this relationship?


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