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3dld abscissa Bermudagrass bottom width buffalograss c.f.s. Find channel chart channel slope chart 52 chart 61 chart 74 charts to find compute the ratio conduit critical curve Critical depth dc critical slope Sc critical velocity cross section culvert depth and velocity depth line depth of flow discharge Q DISCHARGE-Q-CFS equation F/Ffull feet Ffull FL0W flow in open following steps full flow given discharge graph of chart grassed channels head at critical highway drainage hydraulic jump inches intersection of Q Kentucky bluegrass known see example lower graph move vertically nomograph normal depth normal velocity ordinate scale OVAL CONCRETE PIPE part-full flow PIPE LONG AXIS pipe-arch ratio d/D read on chart read the corresponding rectangular relative discharge curve retardance curve Sf full side slopes slope line subcritical flow supercritical supercritical flow total head line trapezoidal upper graph velocity curve velocity of flow vertical line Vn SCALE water surface