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Appendix 4-B <br />The 48" CMP designated C-6 that extends under the county road has accumulated <br />sediment over the years. The chart below presents an estimate of the culvert's capacity <br />with various sediment levels. The sediment level is measured from the invert of the <br />culvert. The chart shows the culvert will handle the design flow of 20.11 cfs with 25.5 <br />inches of sediment. <br /> <br />48" CMP Flow <br />70.0 <br />so.o <br />50.0 <br />N 40.0 <br />LL Sediment Depth = 25.5" <br />U 30.0 i w - <br />20.0 <br />10.0 <br />0.0 <br />0 3 6 9 12 15 18 21 24 27 30 33 36 <br />Sediment Depth Inches <br />Flow calculation is based on Manning's equation. Q=1.49/n(R^2/3)'(S^0.5) <br />Entrance loss 50%. <br />N = 0.02 <br />S = 0.02 <br />r~ ~ tons <br />•~p0 REO~sI~ <br />oo~P°,.....,. <br />. '~F° <br />C V e° ~~G~eJ GK- ~o ~~ <br />° Q a <br />ufr. 1..%~U . <br />o ° o a <br />oA ~. tz~nl9t ,~ ~e <br />,o <br />~°o~~OidAL E~~~pp. <br />mwaeo~' <br />• <br />4-B:9i 12/01 <br />