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cT <br /> Figure 3.2.12-Simple Orifice <br /> The diameter of the orifice is calculated from the flow. The orifice <br /> equation is often useful when expressed as the orifice diameter in inches: <br /> 36.88Q <br /> d = (equation 5) <br /> where d=orifice diameter(inches) <br /> Q=flow(cfs) <br /> h =hydraulic head(ft) <br /> Rectangular Sharp-Crested Weir. The rectangular sharp-crested weir <br /> design shown in Figure 3.2.13 may be analyzed using standard weir <br /> equations for the fully contracted condition. <br /> Volume III—Hydrologic Analysis and Flow Control BMPs—December 2014 <br />