Droughts exposed California’s thirst for groundwater. Now the State hopes to refill its aquifers (Erik STOKSTAD, AAAS Science; April 16, 2020)
Public Comment Open for SGMA Groundwater Sustainability Plans (GSPs):
All Submitted GSPs (CA Department of Water Resources – SGMA Portal)
https://sgma.water.ca.gov/portal/gsp/all
Frequently Asked Questions on Public Commenting on Groundwater Sustainability Plans (CA Department of Water Resources – Sustainable Groundwater Management Office)
N. B.: Public Comment period on submitted GSPs has been extended to either May 15, 2020 or June 3, 2020.

Selected Research Articles:
California’s Central Valley Groundwater Wells Run Dry During Recent Drought (JASECHKO and PERRONE, 2020)
https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019EF001339
Five-century record of climate and groundwater recharge variability in southern California (MANNA et al., 2019)
https://www.nature.com/articles/s41598-019-54560-w
Streamflow availability ratings identify surface water sources for groundwater recharge in the Central Valley (DAHLKE et al., 2018)
http://calag.ucanr.edu/Archive/?article=ca.2018a0032
Projecting groundwater storage changes in California’s Central Valley (MASSOUD et al., 2018)
https://www.nature.com/articles/s41598-018-31210-1
Groundwater recharge assessment in an upland sandstone aquifer of southern California (MANNA et al., 2016)
https://www.sciencedirect.com/science/article/pii/S0022169416304693/pdfft?isDTMRedir=true&download=
Website:
Sustainable Groundwater Management Act – Groundwater (U. C. Davis)
http://groundwater.ucdavis.edu/SGMA/