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• 0 "C" for cano~~25 <br />25 <br />0.01 = x <br />25 16.1 <br />= 0 "C" for canopy 0-16.1 <br />16.1 <br />x ~ 0.006 <br />Therefore, the best "C" value for the pre-mine dryland pasture is 0.06 + 0.006 = 0.066 <br />Irrigate Pasture - 1987 Cover Data <br />The irrigated pasture study area had 5 percent bare ground, 23 percent litter, 0.3 percent <br />annual fortis, 43 percent perennial grasses, and 29 percent perennial fortis for 72 percent <br />perennial live vegetation. Note: The irrigated pasture cover data was taken from the Coal <br />Mining Permit C-81-008: 2005-2006 Mid Term Review, which is based on the 1987 <br />baseline survey. <br />0.3% Annual Fortis <br />43% Perennial Grasses <br />29% Perennial Fortis <br />23% Litter <br />• Ground Cover (cover that contacts the surface) =Annual fortis + Perennial Grasses + Litter <br />Ground Cover = 66.3% <br />Canopy Cover =Perennial Fortis <br />Canopy Cover = 29% <br />Using Table 3 and a canopy of 25% (short brush 0.5 meter in height) and the "G" canopy <br />type, the chart of Figure 2 was developed. From this chart, a ground cover that contacts the <br />surface of 66.3% yields a "C" factor of 0.03. Since the actual canopy is 29%, another chart <br />was developed from the data in Table 2 showing the change in "C" factor versus % ground <br />cover for a canopy of 50%. This is Figure 3, and using a ground cover that contacts the <br />surface of 66.3%, gives a "C" factor of 0.025. Since the actual canopy is 29%, a simple <br />interpolation is required to give the correct "C" factor: <br />0 "C" for canopy 25-50 = 0 "C" for cano~y 25-29 <br />25 4 <br />0.005 = x x ~ 0.0008 <br />25 4 <br />Therefore, the best "C" value for the pre-mine irrigated pasture is 0.025 + 0.0008 = 0.0258 <br />• <br />19 <br />