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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 />2487 <br /> <br />coincide with the growing season. Irrigation seasons and <br /> <br /> <br />practices were determined for each climatic area to calculate <br /> <br /> <br />crop water use. <br /> <br />o Three full cuttings of alfalfa can be obtained, one at the end of <br /> <br /> <br />June, one in mid-August, and one at the end of September. The <br /> <br /> <br />third cutting in southwest Colorado is generally a "short" <br /> <br /> <br />cutting, occurring before full regrowth has occurred and results <br /> <br /> <br />in reduced yield and ET. <br /> <br />o Solar radiation as calibrated by the Bureau of Reclamation for <br /> <br /> <br />Cortez is similar to that in the project area. <br /> <br />o Assumes a well watered crop. <br /> <br />Other assumptions affecting consumptive use are identified for the <br />individual methods. <br /> <br />1.4.2 Sample Project Calculations <br /> <br /> <br />Temperature Methods: <br /> <br /> <br />SCS Modified Blaney-Criddle <br /> <br /> <br />Table A-I. 5 is a summary of calculation procedures for monthly <br /> <br /> <br />estimates of ET by the SCS modified Blaney-Criddle method using <br /> <br /> <br />equation (11). Crop ET is calculated directly using crop growth <br /> <br /> <br />stage coef f ic ient curves as the one shown in Fig ure A-I. 3 ]../. <br /> <br />Growing season for alfalfa is identified in TR-2l as date of 50 <br /> <br />1- 24 <br />