Broad-Crested Weir Calculator

Discharge of a Broad Crested Weir Calculation

Calculate discharge of a broad crested weir using simple broad-crested weir calculator.

Variations in Head Ratio and Coefficient of Discharge for Broad-Crested Weirs
Ratio of actual head	Coefficient of to design head discharge
0.20	3.30
0.40	3.50
0.60	3.70
0.80	3.85
1.00	3.98
1.20	4.10
1.40	4.22

Q = CLH^3/2

Where,
C - Discharge coefficient [1.704 m^1/2 s^-1]
L - Weir length
H - Hydraulic head
Q - Discharge