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USCID Oct. 11-14, 2016, Fort Collins, CO <br /> <br />“Physics are Physics everywhere” <br />Photon fluxes from the sun are constant and geometric <br />effects are readily calculated and/or measured <br />Evaporation requires nearly the same amount of energy <br />everywhere (the latent heat of evaporation) <br />Crops are largely passive resistors to water flow, so that <br />electrical analogues such as the Penman-Monteith <br />Equation can be used <br />Many older methods, including Penman equations, <br />were impacted by faulty weather parameter <br />measurement and/or faulty or biased ET <br />measurement <br />