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Figure 11 <br />Conveyance Efficiency Function for Sand <br />(Permeability between 7.0 and 15.0 inches per hour) <br />1 <br />0.9 <br />v 0.8 <br />c <br />N <br />v 0.7 <br />w <br />v 0.6 <br />c <br />R <br />n' 0.5 <br />U 0.4 <br />0.3 <br />0.2 <br /> <br /> <br /> <br /> <br /> <br />0 5 10 15 20 25 30 <br />Ditch System Length (miles) <br />0 to 1 mile -Based on NRCS Conveyance Efficiency Curve (FIRI) <br />1 to 35 miles -Based on reported efficiencies for large ditches in the Rio Grande <br />Figure 12 <br />Conveyance Efficiency Curves <br />1 <br />0.9 <br />a <br />v 0.8 <br />c <br />N <br />;~ 0.7 <br />w <br />v 0.6 <br />c <br />R <br />y 0.5 <br />c <br />U 0.4 <br />0.3 <br />0.2 <br />0 5 10 15 20 25 30 35 40 <br />Ditch System Length (miles) <br />-Sand Loam -Sand -Gravelly Sand <br />0 to 1 mile -Based on NRCS Conveyance Efficiency Curve (FIRI) <br />1 to 35 miles -Based on reported efficiencies for large ditches in the Rio Grande <br />35 40 <br />appendB_cropcu_6-2004.doc B-14 of B-19 12/13/00 <br />