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Recommended Changes to the USBR Methods Manual <br />A list of the recommended changes to the USBR Methods Manual are presented below. Because of the <br />limited amount of funds available to implement the consumptive use model, a number of the <br />recommendations will not be implemented. <br />Recommendations That Will Be Implemented <br />Recommendations that will be implemented are listed in order of the change that will have the greatest <br />impact to the change that will have the least impact on the consumptive use estimations. <br />1.Improve the estimate of irrigated areas. <br />2.Locally calibrate the SCS Blaney-Criddle. <br />3.Revise and verify acreage and crop evapotranspiration estimates (alfalfa short or pasture <br />short) that are limited by the available water supply. <br />4.Incorporate the contribution to crop evapotranspiration from stored soil moisture. <br />5.Check weather station sites for representativeness. <br />Recommendations That Will Not Be Implemented <br />Recommendations that will not be implemented are listed in order of the change that will have the <br />greatest impact on the consumptive use estimations. <br />1.Update engineering procedures used to determine crop evapotranspiration. <br />2.Separate meadow grass (hay) and pasture grass (grazed) into two new categories for irrigated <br />grass areas. <br />3.Improve estimates of effective precipitation. <br />4.Calibrate an equation for estimating pan evaporation. <br />5.Develop a better estimate of reservoir area. <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />Estimating agricultural consumptive use will require the most effort because it involves the largest <br />amount of consumptive use. Other consumptive use categories can be measured or estimated. A number <br />of changes were explored for the USBR Methods Manual, and five were adopted for use in the CRDSS. <br />3 <br />A275 01.09.95 1.14-1 CSU IDS <br />