# V-Notch Weir Calculator

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

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.

Code to add this calci to your website

#### Formula

Q = 8/15 ×C_{d }×(2g)^{1/2 }×tan(θ/2) ×h^{3/2}
**Where,**
Q = Flow Rate
C_{d} = 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
= 99.8971m^{3}/s