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• 3.2 Vegetation <br />Vegetation evaluations are an indirect parameter in the SEDCAD+ model, impacting Curve Number (CIS, <br />Land Use (LUC), and Control Practice (CP) parameters. 71te vegetation of the site has been given three <br />classifiptions in this analysis: none (bare soil, coat product, and paved areaz); fair cover of bnrsh and grass <br />(over undisturbed hillsides and rock outcrop areaz), and mulched areas (equivalent to a grassed area with no <br />canopy). <br />3.3 Land Use Condition (LUC) <br />r1 <br />~J <br />LUC values relate to runoff velocities, and are a function of the ground cover and slope. LUC values <br />(re[erence SEDCAD+ guidelines) are consistently applied az follows for this analysis. <br />Land Use Condition Values <br />Land Condition land Condition Values <br />Coal produc[ piles (estimate) 1 <br />Bare or nearly bare soil (industrial areas), S <br />mulched areas, and rock outcrop and cliff areas <br />(overland flow) <br />Paved areas (overland flow) and for other than 7 <br />overland flows <br />Channel flow within ditches and culverts (diver- 8 <br />sions) <br />4. UNIDUE SEDCAD+ INPUT PARAMETERS <br />SEDCAD+ parameters unique to a situation are introduced az encountered under area specific discussions. <br />4.1 Areas <br />Areaz (acres) were determined by map meazuremenu. <br />4.2 Curve Number (CN) <br />Curve numbers reflect the runoff potential of an area (a value of 100 represents an impervious area where <br />100% of the water would run off), and is a function of the land use and the soil hydrologic classification. CN <br />values assigned in this analysis are summarized in the following [able (reference the SEDCAD+ guide). <br />r1 <br />LJ <br />