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SWS4 <br />• 20 MILE COAL CO YOAST MINE - AOND D <br />HYDROLOGIC INPUT PARAMETERS <br />WATERSHED ID: SEDCADa <br />WATERSHED ID <br />Pond D -SWS4 Structure 1 ~ SWS4 <br />Spoils -naturally reclaimed/partially seeded <br />Watershed Area: <br />111.6 acres <br />Curve Number; <br />WATERSHED <br />TYPE VEGETATION <br />COVER HYDROLOGIC <br />SOIL GROUP CURVE <br />NUMBER AREA <br />(acres) <br />Spoil (Pre-Law) Fair (>60°6) C 79 111.6 <br />Total 111.6 <br />WEIGHTED CUAVE NUMBER: 79 <br />Soil Erodibllity Faelor (K): <br /> <br />SOIL ERODIBILITY FACTOR <br />SOIL <br />TYPE AREA <br />(acres) K <br />FACTOR K'AREA <br />Average Sotl 111.6 0.25 27.9 <br />Weighted K Factor: 0.25 <br />Control Factor: <br />CONTROL FACTOR <br />CONTROL PRACTICE <br />CONDITION AREA <br />(acres) C <br />FACTOR C'AREA <br />Spoil 111.6 0.26 29.016 <br />Total 1tt.6 29.016 <br />Weighted C Factor: 0.260 <br />NOTE: A Practice (P) factor of 0.8 has been used to reflect the irregular topographic <br />• nature of the spoils. <br />D-34 <br />