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For the other three flumes, head is measured upstream from the throat a distance of 3 to 4 times the maximum expected head. This location is somewhat arbitrary because the head does not vary too much with position, so the exact location of the head measurement is not as important as for a Parshall flume.
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www.lmnoeng.com/Flumes/flumes.htm
www.lmnoeng.com/Flumes/flumes.htm
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Parshall flume sizes are designated by the throat width, W, and dimensions are available for flumes from the 1-in size for free flow of 0.03 ft3/s at 0.2 ft of measuring head up to the 50-ft size with 3,000 ft3/s at a head of 5.7 ft. The free-flow discharge range and dimensions for Parshall flumes are given on figure 8...
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www.usbr.gov/pmts/hydraulics_lab/pubs/wmm/chap08_10.htm...
www.usbr.gov/pmts/hydraulics_lab/pubs/wmm/chap08_10.html
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Submitted Articles: ARTC03050201; Article: What is a Parshall Flume and who invented it? Submitted by: Anthony O'sullivan; ... What is a Parshall Flume and who invented it? A Parshall flume has a special shaped open channel flow section which may be installed in a ditch ,canal, or lateral to measure the flow rate.
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www.flowmeterdirectory.com/flowmeter_artc/parshall.html
www.flowmeterdirectory.com/flowmeter_artc/parshall.html
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utilizing weirs and pools, we installed prefabricated fiberglass Parshall flumes for streamflow measurement in first-order streams in permafrost-dominated ...
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www.fs.fed.us/pnw/pubs/pnw_rn382.pdf
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Flow Meters: We must measure the flow of a waste water stream through a Parshall flume. An accurate rate is important to ensure environmental compliance. The flume is the last device in line right before the pumping station. ... Two conditions of flow can occur through a Parshall flume: free flow and submerged flow.
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www.chemicalprocessing.com/articles/2004/216.html
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Parshall flumes are a particular form of venturi flume developed by the late Dr. Ralph Parshall . They are intended to be installed in open channels in order to determine the flow of water The narrow throat produces a differential head which under the proper conditions is proportional to flow rate. ... Measuring the Depth --
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www.inventron.com/pri1_01.html
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This chapter reviews methods for measuring rates of runoff in channels, small streams and rivers. Estimating the total quantity of runoff by empirical methods or from models is discussed in Chapter 7 ... The Parshall flume...
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www.fao.org/docrep/T0848E/t0848e-09.htm
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Global Water offers flumes for accurate measurement of water consumption. ... The Parshall flumes constrict primarily horizontally, and are design for rectangular or trapezoidal channels. Click HERE for Diagrams and Parshall flume table of Dimensions/Flow Data.
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www.globalw.com/products/flumes.html
www.globalw.com/products/flumes.html
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Level measuring unit offers chameleonic flexibility for major ... - Aug 6, 2007; Hub 4 (press release),For flow applications, BS3680 flume and weir configurations are provided in the MINIFLEX software as standard, together with ten Parshall flume;
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www.mongabay.com/reference/environment/Parshall_Flume.h...
www.mongabay.com/reference/environment/Parshall_Flume.html
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