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Figure 10 <br />Permeability and Soil Type in the Rio Grande Basin <br />Ditch - % Loss per Mile <br />~~ EMPIRE CNL - 1.04 <br />EXCELSIOR D - 1.54 <br />FARMERS UNION CNL - 1.19 <br />N MONTE VISTA CNL - 1.11 <br />N PRAIRIE D - 0.71 <br />RIO GRANDE CNL - 1.06 <br />~, SAN LUIS VALLEY CNL - 1.84 <br /> <br /> <br />~~ <br />Permeability (inches/hour)/ <br />Soil Type <br />0.2 - 1.0 Clay/Silt Loam <br />1.0 - 7.0 Sandy Loam <br />~ 7.0 - 15.0 Sand <br />~ 15.0 - 20.0 Gravelly Sand <br />~,~~ ~~ <br />The curves shown in Figure 9 were developed for ditch systems less than one mile in <br />length. However, that only represents about one quarter of the total ditch systems in the <br />basin. Therefore, the curves were extended based on the canal loss information for the <br />larger ditches discussed above. Figure 11 shows the MRCS conveyance efficiency curve <br />up to one mile in length, and an estimated curve based on available ditch data for up to 35 <br />miles in length for ditches flowing through sand. Figures 12 shows the estimated ditch <br />loss curves used for the three soil types found in the San Luis Valley. <br />appendB_cropcu_6-2004.doc B-13 of B-19 12/13/00 <br />