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L <br />• <br /> <br />TABLE 2.05.3-7 <br />DITCH CALCULATION <br />PAMPA DIVERSION FROM CULVERT 1 TO THE PAMPA RIVER <br />SUN COAL COMPANY - MEADOWS N0. 1 <br />ROUTT COUNTY, COLORADO <br />Culvert No. 1 discharge, 100-year, 24-hour storm = 19.8 cfs (Table 2.05.3-1 <br />modified to 100-year storm event) <br />Curve Number = 79 <br />Slope = 10~ <br />Parabolic Ditch = 5 feet <br />Velocity = 7.6 fps <br />Roughness (n) = 0.040 <br />Flow Depth = .85 feet <br />Discharge Yampa River Flood Plain Flow Characteristics <br />Curve Number = 79 <br />Slope = 1~ <br />Parabolic Ditch = 5 feet <br />Velocity = 3.6 fps <br />Q100 19.8 cfs <br />Flow Depth = 1.5 feet <br />- 186 - <br />(Rev. 5/86) <br />