V-Notch Weir Calculator
English

Notch weir is typically installed in open channels to measure the discharge/flow rate. V notch weir is a type of flow gauge used in measuring water flow especially for V shaped or triangular shaped open channel. It is especially useful in measuring low flow rate and its denoted by symbol 'q'. Use our V-Notch weir calculator to perform the V-Notch weir flow calculation. Enter notch angle, head of the weir and discharge constant to find the flow or discharge rate.

V-Notch Weir Flow Calculation

h
cd
m3/s

Notch weir is typically installed in open channels to measure the discharge/flow rate. V notch weir is a type of flow gauge used in measuring water flow especially for V shaped or triangular shaped open channel. It is especially useful in measuring low flow rate and its denoted by symbol 'q'. Use our V-Notch weir calculator to perform the V-Notch weir flow calculation. Enter notch angle, head of the weir and discharge constant to find the flow or discharge rate.

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Formula

Q = 8/15 ×Cd ×(2g)1/2 ×tan(θ/2) ×h3/2 Where, Q = Flow Rate Cd = Discharge Constant θ = V - Notch Angle g = Gravity Constant (9.81 m/s²) h = Head on the Weir

Example:

Find the flow rate of the water stream having a v-notch angle of 23°, head on the weir as 12 and discharge constant as 5?

Solution:

V-Notch Weir Discharge = 99.8971m3/s

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