Broad-Crested Weir Calculator
Free calculate flow rate over a broad-crested weir using head measurement and weir dimensions. Get instant, accurate results with our easy-to-use calculator.
Input Parameters
Height of water above weir crest
Typical: 1.5-1.7 (default: 1.7)
Results
Enter parameters to calculate flow rate
Broad-Crested Weir Formula
Flow Rate Formula
Q = Cd × B × H3/2
Where Q is flow rate, Cd is discharge coefficient, B is width, H is head
Requirements
- • Weir crest length > 2H
- • H/P < 1.5 (P = weir height)
- • Free flow conditions
- • Upstream head measurement