V-Notch Weir flow is calculated using the following formula:
where
Cd = Coefficient of Discharge
vang = internal angle of the V (degrees)
g = acceleration due to gravity (9.81 m²/s)
H = height of water above weir invert
When the downstream elevation is above the crest elevation the software will use the Villemonte equation to simulate the submerged nature of the flow:
where:
Qs = Submerged Flow Rate
Q = Free-flow rate at H
Yd = Depth downstream
H = Water Depth at point of measurement
V-Notch Weir: Specifications
Angle of V - Enter the angle of the V in degrees.
Coefficient of Discharge - Enter the discharge coefficient of the weir. A default value of 0.59 is given.
Invert Elevation - The invert elevation of the Weir.
