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Both calculators run independently β change the inputs on either side to compare results.
Civil
Culvert Flow Capacity Calculator
Estimate the full-flow discharge capacity of a circular culvert using Manning's equation. Used by civil engineers and hydrologists to size culverts for road crossings, drainage channels, and stormwater systems.
Fill in the required fields to see your result.
Civil
Pipe Flow Capacity Calculator
Determine water flow rate (in GPM) through circular pipes using Manning's equation. Used by civil engineers and plumbers to size pipes for gravity-fed drainage, sewer, and stormwater systems.
Fill in the required fields to see your result.
Key differences
| Culvert Flow Capacity Calculator | Pipe Flow Capacity Calculator | |
|---|---|---|
| Category | Civil | Civil |
| Inputs required | 3 | 4 |
| Result | Flow Capacity (cfs) | Flow Capacity (gallons per minute) |
| What it does | Estimate the full-flow discharge capacity of a circular culvert using Manning's equation. Used by civil engineers and hydrologists to size culverts for road crossings, drainage channels, and stormwater systems. | Determine water flow rate (in GPM) through circular pipes using Manning's equation. Used by civil engineers and plumbers to size pipes for gravity-fed drainage, sewer, and stormwater systems. |