The average error in the estimation of flow rate between them was 0.0032 (0.32%) with a head loss of 0.0348m. For a Parshall flume, the free-flow discharge re. 1 Three dimensional drawing of Parshall flume 2 Plan and sectional view of Parshall measuring flumes 3 Illustration of free flow and submerged flow in a two-foot Parshall flume. Flow rates computed by the fabricated 0.1524m Parshall flume have a slight difference of 0.00002m 3 /s – 0.00018m 3 /s, with that of the free flow calibration. 3 Free flow calibration tables for Parshall flumes. the flume in cfs, Ha is the head over the flume in ft (measured at the point shown for Ha in the diagram above), and C and n are constants for a Parshall Flume of given throat width. When compared with the free flow calibration table for Parshall flumes, the two results were in good agreement. The free flow discharge, Qfree, is computed using established formulas, and the net submerged flow is then Q Q. The Parshall flume free flow equation is Q CHan, where Q is the flow rate through. The results achieved shows that the model has good ability to estimate flow rate passing through the fabricated Parshall. The flow rate of the stream was computed with a Parshall flume equation. In this study, head measurements of a stream behind mass communication department, Nnamdi Azikiwe, University were taken using a fabricated 6-inch Parshall flume for five days. In submerged flow, the downstream water backs up into the throat swallowing the drop making the drop difficult or impossible to identify. A free flowing flume can be identified by the drop in water depth at the flume throat. Our knowledgeable staff has over 30 years of industry experience and can point you in the right direction of which style flume to choose. The advantages of this structure include minimal head loss, low construction cost, adaptability to a variety of channel types and ability to measure wide ranges of flow with custom-designed structure. The standard is valid for submerged as well as free-flowing Parshall flumes. To learn more about where Montana flumes are commonly found or to receive a full list of sizes and accessories, contact TRACOM today. Parshall flume provides economical and flexible water measurement capabilities for a wide variety of open channel flow situations.
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