Rectangular Cutthroat Flow Measurement Flumes

The dimensions and criteria for constructing rectangular cut-throat flumes, their role in water measurement, and the advantages of their use are examined. The differences between free flow and submerged flow conditions are described along with the necessary criteria for determining which flow regime exists. The transition submergences are listed for flume sizes between 1 ft and 6 ft. The general free flow equation and the curves which are used when submerged flow exists in the flumes are presented. Proper installation and maintenance procedures for cutthroat flumes and techniques for measuring flow depths which yield satisfactory results are described.