Pre-Computed Flume TablesWater Measurement Manual, pg. 8-24 to 8-41

• Trapezoidal lined canals– Broad-crested weir with trapezoidal control section

shape (a.k.a. “Replogle flume or weir”)

• Earthen canals– Structures with a rectangular control section shape

• Circular pipes, culverts, etc.– Broad-crested weir composed of a ramp and sill in a

circular pipe

Trapezoidal Lined Canals

Rectangular-Throated Structures

Weirs in Pipes and Culverts

Using the Tables• Pre-computed designs already ensure:

– Froude number less than 0.5

– Adequate measurement accuracy at Qmin

– Adequate measurement accuracy at Qmax

• User must check:– Freeboard at Qmax

– Submergence at Qmax

– Submergence at Qmin

– Lengths of flume components