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r~ <br /> <br /> <br /> <br />~\ <br />Powderhom Coal Company <br />RSRDA-South End <br />South End Ditch Sizing <br />Date: 21-Jul-98 <br />Calculation of Ditch Size <br />S = 0.036 ft/Ft <br />n = 0.025 Table 3.2 Barfield, Wamer and Hahn <br />Flow = Q = 1.12 cfs From 100 yr 24 hr event <br />Location: RSRDA Drainage Ditch-South End <br />Ditch Shape-Trapezoidal (1) or Triangular (2): 2 <br />Side Slope (Z): - 2 tot <br />For Trapezoidal ditch bottom width 0.1 <br />Critical Velocity, fps Table 3.2 Barfield, Wamer and Hahn <br />Depth (d) = 0.4 ft <br />Shape: V-Ditch <br />R= 0.178885 ft <br />Vp= 3.569626 fps <br />A= 0.32 sq ft <br />Q= 1.14228 cfs <br />Freeboard,ft <br />Ditch Width -Top of Flow <br />Ditch Width -Top of Ditch <br />Trapezoidal <br />0.190592 ft <br />3.724493 fps <br />0.36 sq ft <br />1.340818 cfs <br />0.3 <br />1.7 <br />2.9 <br />RSS - 28B <br />