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H - .. <br />DITCH DESIGN picCLANE CANYON 51+53 Above Culvert <br />Design a ditch to safely pass the flows :rom the design event. <br />The ditch should not exibit erosive velocities. <br />Given: event - 10 year 2~1 hour 010 = 6.:;0 cfs <br />Slupe of ditch = 5.i0°e <br />Soil type = Graded loam to cobbles - Noncolioidal <br />pla;<imum Velocity (fps) = 5.00 <br />Ditch Dimensions: Shape = Trapezoidal <br />Depth = d = 0.3 feet <br />Base = b = 4.00 feet <br />Side Slopes = z = 1.00 <br />planning No. = n = 0.030 <br />Area of flow = A = bd + zdz A = 1.29 SO FT <br />Hyd. Radius = R =bd * zdz / b + Zd(zz + 1 )° ` <br />R = 0.266 FT <br />Velocity of flora = V = 1.49%n * R°•bF' # S° 5 <br />V = 4.905 FPS <br />Quantity of Flow = Q = A # V 0 = 6.327 CFS <br />DITCH DESIGN McCLANE CANYON 53+76 <br />Design a ditch to safely pass the flows from the design event. <br />The ditch will be lined with a 2" thick layer of concrete <br />prevent erosion of the subsoil. The outlet of the channel <br />will have an energy dissipator to limit velocity of the flow. <br />Given: Event - 10 year 24 hour 010 = 9.90 cfs <br />Slope of ditch = 7.OOb~ <br />Soil type = Alluvial Silt Noncolloidal <br />Maximum Velocity (fps) = 3.5 <br />Ditch Dimensions: Shape = Trapezoidal <br />Depth = d = 0.15 feet <br />Base = b = 9.00 feet <br />Side Slopes = z = 1.00 <br />planning No. = n = 0.015 <br />-- Area of flow = A = bd + zdz .9 = 1.3i SO FT <br />Hyd, Radius = R =bd + zd' / b + 2d(zz + 1 )o.s <br />R = 0.116 FT <br />Velocity of flow = V = 1.49/n * Ro.ee~ * go.s <br />V = 7.27 FPS <br />.~ Quantity of Floia = Q = A * V 0 = 9.98 CFS <br />i ~> ._ ~ "1 <br />