# V notch Weir Calculator

A V notch weir is a type of flow gauge. V notch weir is used to measure the flowing rate of water in a V shaped or triangular shaped. The purpose of v notch weir is to ensure that the velocity flowing over the weir is only dependent on the upstream head. The low rate of water by V notch weir is denoted by the symbol "q".

Table of Contents:

## 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 (9.81 m/s²)

h = Head on the Weir

This advanced online V notch Weir Calculator is used to calculate the flow rate of water in V shaped or triangular shaped weir.

**Example:**

Calculate the Flow rate in V-notch weir for the given details.

V - Notch angle (θ) = 25 degree

Head on the Weir (h) = 20

Discharge Constant (C_{d}) = 15

**Solution:**

**Apply Formula:**

q = 8/15 ×C_{d} × (2g)1/2 × tan(θ/2) ×h^{3/2}

q = 8/15*15*(2*9.81)*tan(25/2)*20 ^{3/2}

**Flow Rate (q) = 702.6510823885201 m**^{3}