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• Project Title = Culvert Design - CMP #13 <br /> Haul Road To Mining Area #3 <br />WATERSHED HYDROGRAPH <br />Inflow into structure = #1 <br />Structure type: = Null <br />-- Watershed data for watershed #1 <br />Curve number = 83.0 <br />Area = 2.5 acres <br />Hydraulic length = 800.0 feet <br />Elevation change = 75.0 feet <br />Concentration time = 0.08 hours <br />Concentration time type = SCS Upland Curves <br />Unit hydrograph type = Disturbed <br />-- Watershed data for watershed #2 <br />Curve number = 64.0 <br />Area = 85.2 acres <br />Hydraulic length = 4800.0 feet <br />Elevation change = 158.0 feet <br />Concentration time = 1.05 hours <br />Concentration time type = SCS Upland Curves <br />Unit hydrograph type = Agriculture <br />-- Total Area = 87.7 acres <br />• -- Storm Data - 100 year event <br />Total precipitation = 2.4 inches <br />Storm type = SCS Type 2 storm, 24 hour storm <br />Peak discharge = 4.20 cfs <br />Discharge volume = 1.88 acre feet <br />The existing 24" diameter culvert has a capacity of about 12 cfs so <br />it can easily pass the peak discharge of 4.2 cfs. The original <br />design for this culvert is presented on the preceding page 9-34. <br />It was designed based on the assumption that Mining Area No. 2 <br />would be mined, therefore the drainage area for the culvert would <br />be comprised of disturbed and undisturbed areas. Since Mining Area <br />No. 2 was not disturbed, most of the area that contributes run-off <br />to this culvert remains undisturbed. <br />boo <br />V ?. <br />® ~ 19230 <br />i <br />% CI lo6®?® <br />°O!!0 <br />'mss4W <br />9-34a New September 1994