Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Civil
Culvert Flow Calculator
Calculate the full-flow discharge capacity of a circular culvert using Manning's equation. Used by drainage engineers to check whether an existing or proposed culvert can pass a design flood without overtopping.
Fill in the required fields to see your result.
Civil
Pipe Flow Rate Calculator
Determine the flow rate of water through a pipe using the Hazen-Williams equation. Use this when designing or analyzing water distribution systems, irrigation lines, or municipal supply networks.
Fill in the required fields to see your result.
Key differences
| Culvert Flow Calculator | Pipe Flow Rate Calculator | |
|---|---|---|
| Category | Civil | Civil |
| Inputs required | 4 | 4 |
| Result | Flow Rate (cfs) | Flow Rate (gpm) |
| What it does | Calculate the full-flow discharge capacity of a circular culvert using Manning's equation. Used by drainage engineers to check whether an existing or proposed culvert can pass a design flood without overtopping. | Determine the flow rate of water through a pipe using the Hazen-Williams equation. Use this when designing or analyzing water distribution systems, irrigation lines, or municipal supply networks. |