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• <br />TR-45 <br />ArP,eOVED <br />~~~~D~ <br />SITE DITCHES AND CULVERTS <br />DITCH - J8-1 & J8-2 <br /> <br />Watershed data for watershed #1 Disturbed <br /> Curve number 87 <br /> Area 0.5 Acres <br /> Hydraulic length 404 Feet <br /> Elevation change 42 Feet <br /> Concentration time 0.034 Hours <br /> Concentration time type SCS Upland Curves <br /> Unit hydrograph Disturbed <br /> <br />Watershed data for watershed #2 Coal Waste <br /> Curve number 90 <br /> Area 1.52 Acres <br /> Hydraulic length 1214 Feet <br /> Elevation change 48 Feet <br /> Concentration time 0.17 Hours <br /> Concentration time type SCS Upland Curves <br /> Unit hydrograph Rangelands <br /> <br />Watershed data for watershed #3 Disturbed <br /> Curve number 87 <br /> Area 1.23 Acres <br /> Hydraulic length 798 Feet <br /> Elevation change 2 Feet <br /> Concentration time 0.443 Hours <br /> Concentration time type SCS Upland Curves <br /> Unit hydrograph Agriculture <br /> <br /> <br />Total Area 3.3 Acres <br /> <br />Storm data <br /> Total precipitation 2.6 Inches <br /> Storm Type SCS Type 2 storm, 24 hour storm <br /> Peak discharge 9.61 ds Ditch J8-1 <br /> <br /> <br />Flow from other ditches or culverts 6.25 Ditch J10 <br /> <br />Peak discharge 10.21 cfs Ditch J8-2 <br />Exh-8-180iv <br />OSI07 <br />