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Figure 6 <br />Percent Loss per Ditch Mile versus Soil Available Water Content <br />After First Month of Irrigation <br />N <br />1.6 <br />San Luis Valley ~ <br />Excelsior Canal <br />Farmers Union <br />Monte Vista Canal <br />Empire Canal ~ ~ <br />Rio Grande Canal <br />Prairie Ditch <br />L <br />Q. 1.2 <br />a <br />a <br />O <br />J <br />c 0.8 <br />N <br />v <br />L <br />N <br />a <br />0.4 <br />0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 <br />Available Water Content (inches per inch) <br />Average permeability of the lower soil layer for each ditch system was estimated based <br />on the MRCS Colorado based STATSGO mapping using the methodologies described in <br />Appendix C. A good relationship was found between canal loss per mile in the first <br />month and lower soil layer permeability, as shown in Figure 7. Figure 8 also shows that <br />ditches flowing through soil with higher permeability have larger losses. Note that when <br />comparing geologic and soil parameters, an r~ value greater than 0.5 is considered good. <br />appendB_cropcu_6-2004.doc B-9 of B-19 12/13/00 <br />