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USCID Oct. 11-14, 2016, Fort Collins, CO <br /> 2016 – ASCE Manual 70 2nd edition <br />Still a “White Book” <br />Primary inputs <br />1990 1st Edition ASCE Manual 70 <br />1996 ASCE Hydrology Handbook <br />1998 FAO Irrig. and Drain. Paper 56 <br />2005 ASCE Standardized PM Report <br />Purpose: <br />Standardized Calculation of Reference ET <br />QAQC of ET and Weather data and ET Measurements <br />Consistency in Crop Coefficients and Application <br />Recommends Dual Crop Coefficient Approach <br />Recommends Daily and Hourly timesteps <br />Workable methods for Estimating Evaporation from Open Water <br />Guidelines on ET from Landscapes <br /> <br />Motivation: <br />Solidify Progress over the past three decades in: <br />Standardization of Reference ET Calculation <br />Application of Crop Coefficients <br />QAQC of Data <br />Provide Engineering and Legal Communities a Practices Manual on ET