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Figure 2 <br />Percent Loss versus Canal Length <br />After First Month of Irrigation <br />40 <br />35 <br />30 <br />a <br />a <br />O <br />~ 25 <br />0 <br />20 <br />O <br />c <br />~ 15 <br />L <br />a <br />10 <br />Rio Grande Canal <br />San Luis Valley Canal <br />Farmers Union <br />Monte Vista <br />Empire <br />Prairie Ditch <br />Excelsior Canal <br />10 15 20 25 30 35 40 <br />Canal Length (miles) <br />Conveyance Loss versus Canal Capacity <br />In some instances, it was unclear whether the ditch system losses provided by the ditch <br />companies were for the main canal only, or included parts of the lateral delivery system. <br />In addition, some of the main canals become laterals and, therefore, there was uncertainty <br />involved with measuring the main canal lengths. Canal capacity often provides a good <br />basis for estimating conveyance loss, as it can be representative of overall system size as <br />well as the wetted perimeter. Figures 3 and 4 show conveyance loss versus ditch capacity <br />during the first month of irrigation and subsequent months, respectively. <br />The graphs show that larger capacity ditches generally have greater ditch losses, but the <br />r~ values are still too low to use as a basis to predict canal loss. In addition, canal <br />capacities store in HydroBase are decreed ditch capacities, and may not accurately <br />represent the actual ditch configuration. <br />appendB_cropcu_6-2004.doc B-6 of B-19 12/13/00 <br />