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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:

(5.36)

Where

Q

=

Discharge over weir (m3/sec., ft3/sec.)

 

C

=

Weir coefficient (typical values for this kind of weir are C = 1.84 SI and C = 3.33 U.S. customary)

 

L

=

Weir opening width (m, ft)

 

i

=

Number of contractions (i = 0, 1, or 2)

 

H

=

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:

(5.37)

i = 2 corresponds to the case of a contracted rectangular weir.


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