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<br />t TABLE D.9-1 <br /> DIVERSION DESIGN <br /> NEAP LEACH FACILITIES <br />' RUNOFF INTERCEPTOR DITCHES <br /> TYPE 1 <br />' Catchment area (acres) 13 <br /> Overland slope (%) 25 <br /> Hydraulic length (ft) 1,680 <br /> CN 70 <br />' 100-yr precip (inches) 2.90 <br /> Calculated peak flow (cfs) 12 <br />' DITCH SIZING <br /> Q = <br /> Where: <br /> <br /> A (full) 28.5 sq ft <br />R (full) A/P = 28.5/ (see figure C-9) <br />15.95 = 1.79 ft <br /> S = .0225 ft/ft <br /> n = 0.03 <br />1 ll <br />f <br />1 <br />f d <br />t <br /> so Q (fu <br />) = 313 c <br />2 c <br />s > s (a <br />equa <br />e) <br />' TYPE 2 <br /> Catchment area (acres 650 <br />' Overland slope (%) 12.6 <br /> Hydraulic length (ft) 10,500 <br /> CN 70 <br />' 100-yr precipitation (inches) 2.90 <br /> Calculated peak flow (cfs) 228 <br /> DITCH SIZING <br /> A (full) = 87.5 sq ft (see Figure C-9) <br /> R (full) 87,5/28.25 = 3.1 ft <br />' S 0.0295 <br /> n 0.03 <br /> Q (full) = 1,587 cfs > 228 cfs (adequate) <br /> <br />i <br />D-6[ <br />