Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Fluid Mechanics
Hazen-Williams Flow Calculator
Estimate water flow velocity and discharge in a pressurized pipe using the empirical Hazen-Williams equation. Useful for water distribution system design and quick hydraulic calculations on municipal water mains.
Fill in the required fields to see your result.
Fluid Mechanics
Manning's Roughness Flow Calculator
Estimate average flow velocity in an open channel or partially-full pipe using Manning's equation with hydraulic radius, slope, and roughness coefficient. Useful for stormwater design, culvert sizing, channel design, and natural-stream hydraulic analysis.
Fill in the required fields to see your result.
Key differences
| Hazen-Williams Flow Calculator | Manning's Roughness Flow Calculator | |
|---|---|---|
| Category | Fluid Mechanics | Fluid Mechanics |
| Inputs required | 3 | 3 |
| Result | Flow Rate (mΒ³/s) | Flow Velocity (m/s) |
| What it does | Estimate water flow velocity and discharge in a pressurized pipe using the empirical Hazen-Williams equation. Useful for water distribution system design and quick hydraulic calculations on municipal water mains. | Estimate average flow velocity in an open channel or partially-full pipe using Manning's equation with hydraulic radius, slope, and roughness coefficient. Useful for stormwater design, culvert sizing, channel design, and natural-stream hydraulic analysis. |