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Appendix 13-2 V -DITCH / BERM SIZING CALCULATIONS <br />10 Year 24 Hour Preapitation Event = 1.4 Inches <br /><J• <br />CHANNEL i Flow Top ` Bottom Channel Manning Base Side <br />sEGMENT ~ (CFS) Elev. Elev. I Length Slope Number Slopes <br />V -ditch 0.36 { 4790 ~~ 4750 ~ 130 ~ 0.31 0.035 0.50 1.00 <br /> <br /> ELEV Top EI. D'rf. LC 25 LC 50 LC 75 Hydraulic Area <br />Basin Bottom ELEV Z Length Length Length Length SQ FT Acres <br />V -ditch 4,750 (4,860 110 I 75 175 240 340 125,500 0.585 <br />~+ <br />Flow <br />Depth Flow <br />Area Hyd. Velocity Quantity <br />Radius Channel Freeboard <br />Depth <br />0.122 0.076 0.090 4.74 0.359 1.5 { 1.38 <br />Drainage area <br />~ L_ <br />1.5 ft 1 <br />h <br /> <br /> <br />0.5 ft <br />Method and Data from : Peak Flows in Colorado -USDA , SCS 8 <br />r~reciprlati`on - t=regrrerrcy ar5`as of ffrevVesierrr i~Nr(~d Stat~s,~ <br />Volume III; USDOC, NOAA, NWS <br />3-20-99 <br />Appendix 13-2 <br />RSS 28C <br />