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