US groundwater supplies - video

How bad has the US drought been? Images produced by Nasa satellites show that the drought still lingers in underground water supplies. Using data from the twin satellites of the Gravity Recovery and Climate Experiment (GRACE) with satellite and ground-based measurements, Nasa has modelled the relative amount of water stored near the surface and underground. This video shows the storage of groundwater from August 2002-August 2012. The water content of each layer is compared to the average for mid-September between 1948-2009. The darkest red regions show dry conditions that should occur only 2% of the time or about once every 50 years.
Who designed these maps? Developed by scientists at Nasa's Goddard Space Flight Center and the National Drought Mitigation Center
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