Utah Agricultural Experiment Station Research Report No. 212
Crop and Wetland Consumptive Use and Open Water Surface Evaporation for Utah
Robert W. Hill
J. Burdette Barker
Clayton S. Lewis
The continued competition for water in Utah and management requirements for legal water allocation as well as hydrologic considerations necessitates accurate estimates of water use. Competition for water is due to increased urban and rural development as well as declining ground water levels and recurring drought conditions. This highlights the importance of careful water management. Accurate estimates of consumptive water use (CU) or evapotranspiration (ET) and open water surface evaporation are necessary for informed water management.
The primary purpose of this work was to develop estimates of crop and wetland vegetation (phreatophyte) consumptive use and open water surface evaporation throughout the state of Utah. The resultant Crop?ET (ETc), Phreatophyte?ET and evaporation estimates were to be provided for selected National Weather Service Cooperative Observation Network (NWS) stations in Utah. This was expanded to include NWS stations in adjacent states within one degree latitude or longitude of Utah’s borders. Monthly and annual total ETc (including alfalfa reference ET) and open water surface evaporation estimates were prepared for NWS sites for which reasonable datasets could be obtained for the 1971?2008 period.