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Conveyance Loss versus Main Canal Length <br />Most of the ditch company representatives provided loss percentages for the beginning of <br />the irrigation season, when losses tend to be higher due to ditch wetting, and for later in <br />the irrigation season. Based on past experience, we have associated the beginning losses <br />with the first month of diversions. Figure 1 shows the provided ditch losses in percent <br />versus the main canal length for the first month of irrigation. Figure 2 shows the <br />provided ditch losses in percent versus main canal length for subsequent months. <br />An attempted relationship between percent loss and main canal length resulted in low <br />correlation coefficients values (r~) for both time periods, however the trend shows that <br />losses increase with increased canal length. As expected, the average loss per mile is <br />greater during the first month of irrigation - 1.82 versus 1.21. <br />Figure 1 <br />Percent Loss versus Canal Length <br />First Month of Irrigation <br />~o <br />60 <br />~ 50 <br />a <br />O <br />J <br />0 40 <br />LL <br />w <br />O <br />~ 30 <br />N <br />v <br />L <br />a zo <br />10 <br />Canal Length (miles) <br />appendB_cropcu_6-2004.doc B-5 of B-19 12/13/00 <br />0 5 10 15 20 25 30 35 40 <br />