Groundwater makes up 30 to 50 percent of California’s water supply, but until recently there were few restrictions placed on its retrieval. Then in 2014 California became the last Western state to require regulation of its groundwater. With deadlines starting this year, for the first time water managers in the nation’s premier agricultural region—the state’s Central Valley—are tasked with estimating available groundwater. It’s a daunting technological challenge.
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Source: Phys.org