Note: In practice, these coordinates should be checked against the flow conditions of the chosen dimensions of the Parshall flume. If the flumes are shown to be submerged forcing them not to be at critical flows, other coordinates of the parabolic cross sections must be tried until the flumes show critical flow conditions or unsubmerged.

Example 5.7 Repeat previous example problem for grit channels controlled by proportional flow weirs.

Solution: For grit channels controlled by proportional weirs, the cross-section should be rectangular. Thus, constant w = --— = constant; assume w = 1.5 m vhk

Therefore, the depths, Zo, and other parameters for various flow conditions are as follows (for a constant flow-through velocity of 0.30 m/s).





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