May 09, 2007 · Doug Grant's book also has discussions on Palmer-Bowlus and Parshall flumes, as well as V-notch and rectangular weirs, and trapezoidal weirs. The advantage of using a flume or weir is that the equations are extremely well behaved, and if the flume or weir is installed correctly, accuracies of +/- 5% of actual flow or better are easily obtained. Parshall Flume. This calculator finds the flow rate for a Parshall Flume. A Parshall flume has particular dimensions. It can be identified by both a section that has a contraction in the width of the flume as well as a dip in the elevation of the bottom of the flume. The height change is the difference in height between the upstream and ...

Venturi flumes are one of the most important flow-measuring structures commonly investigated by physical model tests in the past. The solutions to the Venturi flume flow problems were generally found on the basis of empirical equations arising from such tests. Nonetheless, the overall accuracy and ...