The V notch, sharp crested weir is one of the most precise discharge measuring devices, suitable for a wide range of open channel flows. The prefabricated weir box provides the necessary upstream channel dimensions required for fully contracted weir operation and maximum accuracy.
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www.freeflowinc.com/vnotch.htm
www.freeflowinc.com/vnotch.htm
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Free Flow weirbox with 12" deep, 60 degree V notch weir plate, slide tracks for upstream resistance screen, depth gauge, base for 316 SS mounting bracket for ultrasonic sensor, and floor clips at base of exterior sidewall to secure box to mounting pad.
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www.freeflowinc.com/newpage14.htm
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Common weir constructions are the rectangular weir, the triangular or v-notch weir, and the broad-crested weir. Weirs are called sharp-crested if their crests are constructed of thin metal plates, and broad-crested if they are made of wide timber or concrete.
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www.engineeringtoolbox.com/weirs-flow-rate-d_592.html
www.engineeringtoolbox.com/weirs-flow-rate-d_592.html
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Online V-notch weirs flow calculator ... Fluid Flowmeters Flow metering basics - Orifice, Venturi, Flow Nozzles, Pitot Tubes, Target, Variable Area, Positive Displacement, Turbine, Vortex, Electromagnetic, Ultrasonic Doppler, Ultrasonic Time-of-travel, Mass Coriolis, Mass Thermal, Weir V-notch, Flume Parshall and Sluice...
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www.engineeringtoolbox.com/weirs-d_524.html
www.engineeringtoolbox.com/weirs-d_524.html
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90 ° V-Notch Weir; The 90 ° V-notch weir, Figure 5 , is most accurate when measuring discharges of less than 500 gpm. The maximum discharge that can be accurately measured is approximately 5,000 gpm. The sides of the notch are inclined outwardly at 45 ° from the vertical.
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www.flowmeterdirectory.com/flowmeter_artc/flowmeter_art...
www.flowmeterdirectory.com/flowmeter_artc/flowmeter_artc_02021403.html
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This is the horizontal length of the v-notch weir opening at the top of the weir, measured perpendicular to the direction of flow.
http://www.bossintl.com/forums/stormnet/16428-v-notch-w...
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The use of 90-degree V-notch weirs to measure discharge at outfalls is common. In many instances the weirs are placed in culverts or other space-limited locations such that the traditional calibration parameter, head over the weir notch, is difficult to measure.
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www.pubs.asce.org/WWWdisplay.cgi?8600970
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by M. N Shesha Prakash, (Professor, Civil Engineering Dept., Jawaharlal Nehru National College of Engineering, Shimoga-577 204, India.) and A. V. Shivapur, (Assistant Professor, Civil Engineering Dept., S.D.M. College of Engineering and Technology, Dharwad-580 002, India.)
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www.pubs.asce.org/WWWdisplay.cgi?0600239
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The weir is one of the oldest structures used to measure the flow of water in open channels. ... Table A7-4 contains discharges in cubic feet per second for the standard 90-degree, fully contracted V-notch weir (figure 7-1) from the Cone equation for a range of heads ordinarily used in measuring small flows.
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www.usbr.gov/pmts/hydraulics_lab/pubs/wmm/chap07_11.htm...
www.usbr.gov/pmts/hydraulics_lab/pubs/wmm/chap07_11.html
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