A major source of both irrigation and domestic consumption, it is also one of the fastest - declining groundwater reserves in the country. (scientificamerican.com)
Scientists typically monitor groundwater reserves using wells, but this method fails to provide the global picture of how water levels are changing. (sciencenews.org)
And, while the water balance data showed some recovery of groundwater reserves during the non-drought years, the GRACE data does not reflect that. (sciencedaily.com)