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USCID Oct. 11-14, 2016, Fort Collins, CO <br /> 1990 – ASCE Manual 70 “White Book” published <br />Edited by Jensen, Burman, Allen <br />Built on Orange Book <br />Introduced the ASCE Penman-Monteith (PM) <br />Made substantial comparisons of methods against <br />lysimeter measurements <br />Purpose: <br />Illustrated higher accuracy of physical equations <br />(Penman, PM) <br />Recommended best calculation approaches <br />Recommended daily timesteps instead of monthly <br />Motivation: <br />Improve the recognition of strengths and <br />weaknesses of ET methods amongst the ET communities <br />Describe expected performances