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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />-- <br /> <br />2492 <br /> <br />Radiation Methods: <br />Jensen-Haise With Elevation Correction <br />Table A-l. 7 is a summary of calculation procedures for monthly <br />estimates of ET by the Jensen-Haise method using equation (13) ~ith <br />the full elevation correction. Solar radiation data were taken from <br /> <br />the <br /> <br />Bureau's <br /> <br />Animas-LaPlata <br /> <br />They were <br /> <br />obtained <br /> <br />by <br /> <br />report. <br /> <br />correlating measured solar radiation at Grand Junction and Cortez. <br /> <br />Cumulative potential ET (synonymous with alfalfa reference ET) is <br />38.4 inches. Mean crop coefficients are derived from Table A-l.2 <br />assuming cuttings at the end of June, mid-August, and at the end of <br />September. Seasonal mean Kc value is .86-and seasonal consumptive <br />use is 33.0 inches. <br /> <br />Jensen-Haise Without Elevation Correction <br /> <br />'l:he Jensen-Raise method with full elevation correction must be used <br /> <br /> <br />with caution at elevations above 4500 feet due to its tendency to <br /> <br /> <br />over-predict ET in certain surroundings.~/ The elevation <br /> <br /> <br />correction is omitted (set to zero) in this calculation for <br /> <br />comparison <br /> <br />with <br /> <br />fully <br /> <br />the <br /> <br />corrected <br /> <br />version. <br /> <br />Calculation <br /> <br />procedures are identical. Results are shown at the bottom of Table <br /> <br />A-l.7. Seasonal reference crop ET is 23.0 inches and crop ET is 19.7 <br />inches. <br /> <br />". <br /> <br />1- 29 <br />