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WEIR CONTROL <br /> Q = C (3.0-0.5) H1 . 5 Pg. 6.110 <br /> Assumes use of "Kansas-type" trashrack and anti-vortex device <br /> Q = flow <br /> D = conduit diameter <br /> H = head on weir <br /> C = 3.27 + (0.4 W ) (Table 6. 9, sharp-crested weir) <br /> W = height of riser pipe <br /> ORIFICE CONTROL <br /> Q = Co A (2gH) <br /> g = 32.2 ft/sec2 <br /> C = 0.75 (Table 6.9, inward-projecting entrances) <br /> 0 <br /> A = area of pipe section <br /> --PIPE FLOW <br /> Q = A (2gH*) <br /> (1+Ke+Kb+Kf) <br /> Ke = 1 .0 (Pg. 6.110) <br /> Kb 0.5 bend loss coefficient <br /> A = area of pipe section <br /> H* = H + head from inlet to outlet <br /> _ (184.6 n2 L) <br /> Kf - D4/3 <br /> n = 0.025 for cmp <br /> L = total length of pipe, including riser <br /> Ref: OSM - Surface Water Hydrology and Sedimentology Manual <br /> Sec. 6.4.3. <br /> 36 <br /> II <br />