Terrestrial water storage change reflects the variability of Earth's climate and the change in the fundamental fresh water resources that sustains various life forms.

We use an augmented version of the National Center for Atmospheric Research (NCAR) Community Land Model (CLM) to model the change in total terrestrial water storage, which includes snow water, soil water and groundwater storage, from 1948–2004. The standard NCAR CLM was augmented by implementing a simple groundwater model that describes the variation of groundwater storage. The augmented version of CLM is validated against Gravity Recovery and Climate Experiment (GRACE) terrestrial water storage change data from 2002-2004. We will also present the impacts of groundwater pumpage on the change in groundwater storage and evapotranspiration in agricultural areas.