Open Channel Flow: V Notch

The Notches are made from thin metal sheets. Triangular notches are generally used for measuring small flows upto about 1.25 m/s.

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Discharge Calculation in Open Channels

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Formula

The discharge calculation formula from triangular notches is as given below;

V=(8/15)*Ce*(2g)^(1/2)*tan(theta/2)*h^2.5

Where,

Q = Discharge in cubic meter per second,

Theta = Angle of Notch at center,

h = Head causing flow in meters,

Ce = Coefficient of Effective Discharge

(The value of Ce varies from 0.603 to 0.686 for values of head varying from 0.060 to 0.377 meters)