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Broad-Crested Weir Flow Calculator — result sheet
Estimate ideal flow over a broad-crested weir from crest width, head, discharge coefficient, and gravity.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Q = (2/3)Cd·b·√(2g)·H^(3/2).
The idealized relation estimates discharge for a broad-crested overflow section from the upstream head and geometry.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Discharge coefficient — minimum 1.0E-6; maximum 100
- Crest width — m; minimum 1.0E-6; maximum 1000000
- Water head above crest — m; minimum 0; maximum 1000000
- Gravitational acceleration — m/s²; minimum 1.0E-6; maximum 1000
Worked example
| Input | Value |
|---|---|
| Discharge coefficient | 1.7 |
| Crest width | 2 |
| Water head above crest | 0.3 |
| Gravitational acceleration | 9.80665 |
Estimated flow ≈ 1.649 m³/s.
Assumptions and limits
- Inputs use SI units and head is nonnegative.
- The coefficient represents the selected hydraulic convention.
- Approach velocity, submergence, viscosity, roughness, sediment, freeboard, and design approval are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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