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0.60 <br />~. <br />>_ 0.50 <br />0 <br />H <br />o ~ 0.40 <br />~ o <br />o <br />~. <br />U ~ <br />~ .~ <br />~. <br />~, I-yl 0.30 <br />~ ~ <br />o ~ <br />~ x 0.20 <br />U <br />T <br />N <br />7 <br />0 0.10 <br />C..) <br />0.00 <br />Figure B-2 <br />Conveyance Loss versus Ditch Capacity <br />~- <br />• ~ <br />y = 7E-OSx + 02065 <br />R~ = 0.0338 <br />~ ~ <br />200 400 600 800 1000 1200 <br />Ditch Capacity (cfs) <br />Conveyance Loss versus Soil Moisture Parameters <br />Average soil moisture holding capacities (AWC) for each ditch system were estimated <br />based on the Soil AWC GIS layer prepared for the SPDSS project. Figure B-3 indicates <br />no apparent correlation between canal loss per mile and AWC. Therefore, relationships <br />between canal loss and average AWC should not be used to predict canal losses by water <br />district in the South Platte basin. <br />Average permeability of the lower soil layer (i.e., the soil layer greater than 3 feet below <br />the ground surface) for each ditch system was estimated based on the soil permeability <br />layer prepared for the SPDSS project. Figure B-4 indicates that there is a correlation <br />between canal loss per mile and lower soil layer permeability. The figure also indicates <br />that ditches flowing through soil with higher permeability have greater losses. <br />Page BS of B9 <br />