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• Project Title <br />WATERSHED HYDROGRAPH <br />Inflow into structure <br />Structure type: <br />= Culvert Design - CMP #13 <br />Haul Road To Mining Area #3 <br />_ #1 <br />= Null <br />-- Watershed data for watershed #1 <br />Curve number = 83 0 <br />Area <br />Hydraulic length <br />Elevation change <br />Concentration time <br />Concentration time type <br />Unit hydrograph type <br />= 2.5 acres <br />= 800.0 feet <br />= 75.0 feet <br />= 0.08 hours <br />= SCS Upland Curves <br />= Disturbed <br />-- Watershed data for watershed #2 <br />Curve number = 64 0 <br />Area <br />Hydraulic length <br />Elevation change <br />Concentration time <br />Concentration time type <br />Unit hydrograph type <br />-- Total Area <br />= 85.2 acres <br />= 4800.0 feet <br />= 158.0 feet <br />= 1.05 hours <br />= SCS Upland Curves <br />= Agriculture <br />= 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 />.°~~.?<` GF.°. <br />v • <br />:~ 19230 ~~*` <br />.*; <br />-a ~e <br />~A : ; ~4.• <br />'~::owa;;a~' <br /> <br />9-34a <br />New September 1994 <br />