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H <br /> riser <br /> D 10) <br /> AI <br /> PLAN <br /> NTS <br /> SECTION <br /> NTS <br /> Figure 3.2.13- Rectangular, Sharp-Crested Weir <br /> Q=C (L- 0.2H)H (equation 6) <br /> where Q=flow(cfs) <br /> C=3.27+0.40 H/P (ft) <br /> H, P are as shown above <br /> L=length (ft) of the portion of the riser circumference <br /> as necessary not to exceed 50 percent of the <br /> circumference <br /> D=inside riser diameter (ft) <br /> Note that this equation accounts for side contractions by subtracting 0.1H <br /> from L for each side of the notch weir. <br /> Volume III—Hydrologic Analysis and Flow Contro —December 2014 <br /> X33 sgt ._ <br />