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• <br />DITCH HYDROLOGY CALCULATIONS <br /> DITCH B1 <br /> Ditch B1 Ditch 62 Total <br />Drainage Area (acres) 46.3 65.4 111,7 <br />Maximum Elevation (ft0 8,362 8,462 <br />Minimum Elevation (ft) 8,230 8,210 <br />Drainage Height (ft) 132 192 <br />Hydraulic Length (ft) 1,600 1,500 <br />Average Slope (%) 8.3 12,8 <br />Slope Adjustment Factor 0.84 0.95 <br />Sub Area Acres Curve No. <br />Di tc}i~- <br />Disturbed 30.7 96 <br />Undisturbed B 0.8 78 <br />Undisturbed C 14.8 87 <br />Ditch B2 <br />Disturbed 16.1 96 <br />Undisturbed B 23.8 7g <br />Undisturbed C 25.5 87 <br />Average Curve Number 93 86 <br />• <br />Average Runoff (in) <br />10-year, 24-hour 1.04 0.63 <br />25-year, 24-hour event 1.31 0.85 <br />100-year, 24-hour event 1.78 1.24 <br />Equivalent Area (acres) 29.8 26.7 <br />Equivalent Peak Dischargee (cfs/in) 67 75 <br />Actual Deak discharge (cfs/in) 81.4 174.5 <br />Peak Discharge (cfs) <br />10-year, 24-hour event 91 110 201 <br />25-year. 24-hour event 115 148 263 <br />100-year, 24-hour event I56 216 372 <br />C <br />23-28 <br />