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- A Montana flume, is a popular modification of the standard Parshall flume. The Montana flume removes the throat and discharge sections of the Parshall flume, resulting a flume that is lighter in weight, shorter in length, and less costly to manufacture. Montana flumes are used to measure surface waters, irrigations flows, industrial discharges, and wastewater treatment plant flows. As a short-throated flume, the Montana flume has a single, specified point of measurement in the contracting section at which the level is measured. The Montana flume is described in US Bureau of Reclamation's Water Measurement Manual and two technical standards MT199127AG and MT199128AG by Montana State University. As a modification of the Parshall flume, the design of the Montana flume is standardized under ASTM D1941, ISO 9826:1992, and JIS B7553-1993. The flumes are not patented and the discharge tables are not copyright protected. A total of 22 standard sizes of Montana flumes have been developed, covering flow ranges from 0.005 cfs [0.1416 L/s] to 3,280 cfs [92,890 L/s]. Lacking the extended throat and discharge sections of the Parshall flume, Montana flumes are not intended for use under submerged conditions. Where submergence is possible, a full length Parshall flume should be used. Should submergence occur, investigations have been made into correcting the flow. Under laboratory conditions the Parshall flume - upon which the Montana is based - can be expected to exhibit accuracies to within +/-2%, although field conditions make accuracies better than 5% doubtful. (en)
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- A Montana flume, is a popular modification of the standard Parshall flume. The Montana flume removes the throat and discharge sections of the Parshall flume, resulting a flume that is lighter in weight, shorter in length, and less costly to manufacture. Montana flumes are used to measure surface waters, irrigations flows, industrial discharges, and wastewater treatment plant flows. A total of 22 standard sizes of Montana flumes have been developed, covering flow ranges from 0.005 cfs [0.1416 L/s] to 3,280 cfs [92,890 L/s]. (en)
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