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The v notch weir is widely used to measure open channel flow rate.
V notch weir formula derivation. We were discussing the various types of notches and weirs ie. Usbr 1997 suggests using the v notch weir equations for the following conditions. Triangular notch thin plate weir installed at the end of a rectangular channel.
The cone equation is commonly used for 90degree v notch weirs. The crest surfaces of the weir notch are plane surfaces which form sharp right angle corners at their intersection with the upstream face of the weir plate. It is especially good for measuring a low flow rate because the area of flow through the v notch becomes quite small while the head over the v notch is still a measurable value.
Q 428 ce tano2h k52 where the effective discharge coefficient ce and the head correction factor k are both functions of the notch angle o. Classifications of notches and weirs difference between notches and weirs and also the expression for discharge over a rectangular notch or weir in the subject of fluid mechanics in our recent posts. For a v notch weir with a notch angle other than 90 degrees the equation for calculation of the flow rate over the weir is given by the equation.
The bottom of the notch is the lowest point with the sides going up at 45 degree angles. A right angled v notch was used to measure the discharge of a centrifugal pump. Weirs are structures consisting of an obstruction such as a dam or bulkhead placed across the open channel with a specially shaped opening or notch.
The flow rate over a weir is a function of the head on the weir. The water before the weir should be held in a relatively calm and smooth pool. Common weir constructions are the rectangular weir the triangular or v notch weir and the broad crested weir.
The cone equation is. Assume coefficient of discharge as 062. This calculates the flow rate over a 900 triangular notch weir.
If the depth of water at v notch is 200mm calculate the discharge over the notch in liters per minute. 900 triangular notch weirs. The width of the crest surface varies but it is general ly between 132 and 116 inch.
The opening to this weir is a 90 degree triangular notch. It doesnt matter how thick the weir is except where water flows over the weir through the v the weir should be between 003 and 008 inches 08 to 2 mm thick in the v. Q discharge over weir in ft 3 s h 1 head on the weir in ft b discharge of 90 degree contracted v notch weirs.
Head h should be measured at a distance of at least 4h upstream of the weir.
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