Rectangular Sharp-Crested Weir
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Figure 5-5: Rectangular Sharp-Crested Weir
The discharge over an unsubmerged rectangular sharp-crested weir is defined as:
Discharge over weir (m3/sec., ft3/sec.)
Weir coefficient (typical values for this kind of weir are C = 1.84 SI and C = 3.33 U.S. customary)
Weir opening width (m, ft)
Number of contractions (i = 0, 1, or 2)
Head above bottom of opening (m, ft)
i = 0 corresponds to the case of a suppressed rectangular weir, for which the channel width is equal to the weir opening length, and yields the equation:
i = 2 corresponds to the case of a contracted rectangular weir.
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