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Broad Crested Weir Calculator
Discharge over a broad-crested weir from crest width, head and discharge coefficient.
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Discharge over a broad-crested weir from crest width, head and discharge coefficient.
Broad Crested Weir Estimator
Enter your numbers below for an instant estimate.
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💡 Tip: Q = Cd x 1.705 x b x H^1.5 (SI).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Broad Quick Guide
Typical values for reference.
| Width m | Head m | Cd | Q m3/s |
|---|---|---|---|
| 2 | 0.1 | 0.85 | 0.092 m3/s |
| 2 | 0.3 | 0.85 | 0.476 m3/s |
| 2 | 0.5 | 0.85 | 1.025 m3/s |
| 2 | 1 | 0.85 | 2.898 m3/s |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Broad Crested Weir Calculator FAQ
Answers to common questions about this calculator.
A flat-topped weir where flow passes through critical depth.
No, it depends on geometry and head.
Q = Cd x 1.705 x b x H^1.5 (SI).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.