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The conveyance efficiency accounts for losses between the river headgate and the farm <br />headgate, including losses through canals, ditches and laterals. The maximum flood <br />irrigation and sprinkler efficiencies account for application losses between the farm <br />headgate or well and the crops. Note that conveyance and maximum application <br />efficiency data input data were not adjusted by year. However, a structure's overall, <br />system efficiency may change by year due to changes in the percent of land served by <br />sprinkler or flood application methods, or due to surface water supply in excess of crop <br />requirements. <br />The development of efficiency estimates is described in the memorandum titled Rio <br />Grande Historic Crop Consumptive Use -Ditch System Efficiencies, included in <br />Appendix B. As noted in the memorandum, the larger ditch systems in District 20 had <br />specific information regarding conveyance efficiencies. The estimated conveyance <br />efficiencies for these seven large ditch systems are shown in Table 9. <br />Table 9 <br />Estimated Conve ance Efficiencies for S ecific Lar a Ditch S stems <br />Ditch S stem Conve ance Efficiencies <br />Rio Grande Canal 65 <br />Farmers Union Canal 62 <br />San Luis Valle 63 <br />Prairie Ditch 78 <br />Excelsior Ditch 78 <br />Em ire Canal 75 <br />Monte Vista Canal 68 <br />Conveyance efficiencies for other ditch systems are based on a relationship between <br />conveyance efficiency, soil type, and the overall ditch and lateral length, described in <br />Appendix B. Table 10 shows the results of this analysis and the number of ditches that <br />are represented in each efficiency bracket. The maximum flood irrigation and sprinkler <br />irrigation efficiencies were estimated to be 60 percent and 80 percent respectively. <br />Table 10 <br />Conveyance Efficiencies and Corres ondin Number of Ditches <br />Efficient Number of Ditches <br />>90% 15 <br />80 to 90% 61 <br />70 to 80 % 257 <br />60 to 70 % 47 <br />< 60% 27 <br />Total 407 <br />cureport_6-2004.doc 25 of 48 June, 2004 <br />