There is a demand in the semi-arid Texas High Plains for forage crops to support the growing dairy industry. Traditionally, farmers in this region have grown corn for silage for this purpose. However, forage sorghum may produce comparable biomass yields while using less water. In this study, remote sensing observations and crop models are used to compare the water used in growing these two forage crops. Results of this study are validated using field observations of crop water use determined from eddy covariance measurements.