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USCID Oct. 11-14, 2016, Fort Collins, CO <br /> 2005 – ASCE Task Committee Report on Standardized <br />Calculation of Reference Evapotranspiration <br /> <br />Purpose: <br />Recommended Standardization of Calculation of <br />Penman-Monteith as a Reference Equation <br />“Single Equation” for Grass and Alfalfa References <br />Recommended Rigorous Quality Assessment/Quality <br />Control (QAQC) of Weather Data <br />Recommended Collection of Weather Data in Well-Watered Environments <br />Recommended Hourly or Daily Calculation TimeSteps <br /> <br />Motivation: <br />Requests for Standardization and Recommendations on <br />Reference ET by: <br />Irrigation Association <br />Offices of State Engineers <br />Water Attorneys <br />Professional Societies <br /> <br /> <br />ASCE ET Committee Meeting, Bushland, TX, 2008 <br />Terry Howell <br />USDA-ARS <br />Tom Trout <br />USDA-ARS <br />Richard Cuenca <br />Oregon State <br />Rick Allen <br />Univ. Idaho <br />Rick Snyder <br />UC-Davis <br />Tom Ley <br />State of Colorado <br />Jeppe Kjaersgaard <br />Univ. Idaho <br />Marvin Jensen <br />USDA-ARS / <br />CSU