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Challenge: ET under potential vs <br />water limiting conditions <br /> <br />Landscape is at different levels of stress; <br />thus, actual ET is <= potential. <br /> <br />Allen et al (1998)* <br />ETa = Ks * Kc * ETo <br />Kc = type and stage of crop (~0.15 – 1.2) <br />Ks = soil moisture stress factor (0 to 1) <br /> <br />*:well established, but requires knowledge of <br />crop types, stage and moisture distribution