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Table Al <br />Values of C„ and Cd <br />Calculation Time Step h <br />ort Reference Crop (ETog) <br />S T <br />all Reference Crop (ET~g) <br /> l/ <br />++ <br />~-n Cd ++ <br />l <br />~m Cd <br />Daily 900 .34 1600 .38 <br />Hourly, daytime 37 24 66 25 <br />Hourly, nighttime 37 .96 66 1.7 <br />The units of the variables in the ASCE Standarized P-M Equation and more detail on the <br />calculational process can be found in the manual and associated appendices for the ASCE <br />Standardized P-M equation available from www.kimberly.uidaho.edu/water/asceewri/. <br />While the ASCE Standardized P-M equation remains complicated, considerable simplification <br />and standardization has been performed compared to previous versions of the Penman-Monteith <br />equation. Real life performance tests reported at an April 2004 seminar (Colorado Bar, 2004), <br />demonstrate good agreement between results using the ASCE Standardized P-M equation and <br />measured evapotranspiration. This equation appears to have the support of most of the experts in <br />crop consumptive use calculations. <br />