How much groundwater did California's Central Valley lose during the 2012-2016 drought?

What is it about?

This article utilized different data sources to estimate each component in the water-balance equation and derives therefrom the change of groundwater storage during the 2012-2016 CA drought.

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Why is it important?

The groundwater in Central Valley is absolutely important to the region. As the dry condition over past few years has just been mitigated, exploring the role of the drought and how much groundwater lost can provide useful information and foundation of distribution strategies to water management.