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USCID Oct. 11-14, 2016, Fort Collins, CO <br />)1( <br />)(273)(408.0 <br />2 <br />2 <br />uC <br />eeuT <br />CGR <br />ET <br />d <br />as <br />n <br />n <br />ref  <br /> <br /> <br /> <br />full Penman-Monteith <br />Standardized FAO56/ASCE Penman-Monteith <br /> <br /> <br /> <br />/ <br />r <br />r1 <br />r <br />)e(ecG)(R <br />ET <br />a <br />s <br />a <br />as <br />pan <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />timeK <br />f (Solar Radiation) f (Temperature) <br />f (Humidity) <br />Wind Speed <br />Cn and <br />Cd are <br />constants <br />50 s m-1 <br />(daytime hourly) <br />70 s m-1 <br />(24-hr) <br />for grass <br /> <br />ASCE PM can be applied to clipped grass and to 0.5 m tall alfalfa <br />30 s m-1 <br />(daytime hourly) <br />45 s m-1 <br />(24-hr) <br />for alfalfa <br />