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Post-Mine Conditions <br />Dryland Pasture - 2007 Cover Data <br />The vegetation data is from the report 2007 Vegetation Sampling for Phase 2 Bond <br />Release: Irrigated Pasture and Dryland Pasture. <br />9.7% Annual Forbs <br />0.8% Annual Grasses <br />15.4% Perennial Grasses <br />9.3% Perennial Forbs <br />0.0% Perennial Shrubs <br />25.8% Litter <br />Ground Cover (cover that contacts the surface) = Annual forbs + Annual Grasses + <br />Perennial Grasses + Litter <br />Ground Cover = 51.7% <br />Canopy Cover = Perennial Shrubs + Perennial Forbs <br />Canopy Cover = 9.3% <br />Using Table 3 and a canopy of 0% (short,brush 0.5 meter in height) and the "G" canopy <br />type, the chart of Figure 1 was developed. From this chart, a ground cover that contacts the <br />surface of 51.7% yields a "C" factor of 0.065. Since the actual canopy is 9.3%, another <br />chart was developed from the data in Table 2 showing the change in "C" factor versus % <br />ground cover for a canopy of 25%. This is Figure 2, and using a ground cover that contacts <br />the surface of 51.7%, gives a "C" factor of 0.055. Since the actual canopy is 9.3%, a <br />simple interpolation is required to give the correct "C" factor: <br />0 "C" for canopy = 0 "C" for canopy <br />25 9.3 <br />0.01 = x x 0.004 <br />25 9.3 <br />Therefore, the best "C" value for the post-mine dryland pasture is 0.055 + 0.004 = 0.059 <br />22