Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Fluid Mechanics
Hazen-Williams Flow Rate Calculator
Calculate water flow rate in pressurised pipes using the Hazen-Williams equation given pipe diameter, hydraulic gradient, and C factor. Widely used by civil engineers for water main and irrigation system design.
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 Rate 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 | Calculate water flow rate in pressurised pipes using the Hazen-Williams equation given pipe diameter, hydraulic gradient, and C factor. Widely used by civil engineers for water main and irrigation system design. | 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. |