Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Civil
Culvert Design Calculator
Size a circular or box culvert to pass a design stormwater discharge using Manning's equation. Essential for highway engineers, drainage designers, and land developers ensuring roads stay clear during storm events.
Fill in the required fields to see your result.
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.
Key differences
| Culvert Design Calculator | Culvert Flow Calculator | |
|---|---|---|
| Category | Civil | Civil |
| Inputs required | 5 | 4 |
| Result | Required Culvert Diameter (m) | Flow Rate (cfs) |
| What it does | Size a circular or box culvert to pass a design stormwater discharge using Manning's equation. Essential for highway engineers, drainage designers, and land developers ensuring roads stay clear during storm events. | 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. |