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A reliable method of estimating crop consumptive water use <br />(ET) is needed for the Lower Arkansas Valley of Colorado. <br />Underlying issues: <br />•Arkansas River Compact <br />•ASCE Penman-Monteith <br />Equation for calculating ET <br />•Hydrologic-Institutional (HI) <br />model for compact compliance <br />John <br />Martin <br />Reservoir <br />•95,160 hectares irrigated <br />•2.1 billion cubic meters of <br />irrigation water per year <br />(85% of total diversions) <br />Capacity: 763 Million m3