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Both calculators run independently — change the inputs on either side to compare results.
Fluid Mechanics
Manning's Equation Open Channel Calculator
Compute flow velocity and discharge in open channels — rivers, canals, and drains — using Manning's equation. Essential for flood modelling, irrigation design, and stormwater drainage sizing.
Fill in the required fields to see your result.
Fluid Mechanics
Darcy-Weisbach Pressure Loss Calculator
Compute friction pressure loss in a pipe using the Darcy-Weisbach equation, the rigorous standard for all Newtonian fluids and flow regimes. Useful for pump sizing, pipe sizing decisions, and verifying pressure budgets in process and HVAC systems.
Fill in the required fields to see your result.
Key differences
| Manning's Equation Open Channel Calculator | Darcy-Weisbach Pressure Loss Calculator | |
|---|---|---|
| Category | Fluid Mechanics | Fluid Mechanics |
| Inputs required | 4 | 4 |
| Result | Flow Rate (m³/s) | Pressure Loss per Unit Density (m²/s²) |
| What it does | Compute flow velocity and discharge in open channels — rivers, canals, and drains — using Manning's equation. Essential for flood modelling, irrigation design, and stormwater drainage sizing. | Compute friction pressure loss in a pipe using the Darcy-Weisbach equation, the rigorous standard for all Newtonian fluids and flow regimes. Useful for pump sizing, pipe sizing decisions, and verifying pressure budgets in process and HVAC systems. |