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The Dual Kc Approach <br />ETc = Kc ETref <br /> <br />Kc = Ks Kcb + Ke <br /> <br />Ks = stress coefficient (0 – 1) <br />Kcb = ‘basal’ coefficient representing ET with dry <br />surface soil layer (primarily transpiration) <br />Ke = evaporation from wet soil surface <br /> <br />Ke = Kr (Kc max r -KsKcb) <br /> <br />Kc max r = max[Kc max bare, (Kcb + 0.05)] <br />10/24/2016 USCID / Colorado ET Workshop, Oct. 13, 2016, Fort Collins, CO <br /> <br />(Transpiration (Kcb) has priority over E)