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• Project Title <br />WATERSHED HYDROGRAPH <br />Inflow into structure = <br />Structure type: _ <br />ti <br />Culvert Desigi C? <br />Haul Road To <br />#1 <br />Null <br />-- Watershed data for watershed #1 <br />Curve number = 64.0 <br />Area = 92.7 acres <br />Hydraulic length = 5300.0 feet <br />Elevation change = 110.0 feet <br />Concentration time = 1.46 hours <br />Concentration time type = SCS Upland Curves <br />Unit hydrograph type = Agriculture <br />-- Total Area <br />= 92.7 acres <br />.? 20,5CA <br />`75 13.33 <br />6It -,,G j <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 = 3.61 cfs <br />Discharge volume = 1.82 acre feet <br />The existing 18" diameter culvert has a capacity of about 5.75 cfs <br />so it can easily pass the peak discharge of 3.61 cfs. The original <br />i design for this culvert is presented on the preceding page 9-33. <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, all of the area that contributes run-off <br />to this culvert remains undisturbed. <br />o OR . -0 <br />e • <br />dV <br />a eQ ?;?® <br />s * 19230 <br />Q?A <br />%9-Z???? ° `moo <br />?eq?UN A'0® <br /> <br />0 c? <br />9-33a New September 1994