Satellite-based estimates of groundwater depletion in India

Water resources are at a premium in many parts of the world, and India is one of them. Indirect evidence suggests that groundwater is being consumed faster than it is being naturally replenished in northwest India, but assessments of large-scale rates of depletion are difficult to construct from ground based measurements, which are often scattered and incomplete. Gravity observations from NASA's Gravity Recovery and Climate Experiment (GRACE)...