Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Civil
Storm Water Runoff Calculator
Estimate peak stormwater runoff flow from a drainage basin using the Rational Method. Ideal for sizing storm drains, culverts, and detention ponds for small urban and suburban catchments under 200 acres.
Fill in the required fields to see your result.
Civil
Pipe Flow Velocity Calculator
Calculates the average flow velocity of fluid in a circular pipe given a volumetric flow rate and pipe diameter. Use it when sizing pumps, checking design velocities, or troubleshooting pipe systems.
Fill in the required fields to see your result.
Key differences
| Storm Water Runoff Calculator | Pipe Flow Velocity Calculator | |
|---|---|---|
| Category | Civil | Civil |
| Inputs required | 3 | 2 |
| Result | Peak Runoff Flow (cfs) | Flow Velocity (m/s) |
| What it does | Estimate peak stormwater runoff flow from a drainage basin using the Rational Method. Ideal for sizing storm drains, culverts, and detention ponds for small urban and suburban catchments under 200 acres. | Calculates the average flow velocity of fluid in a circular pipe given a volumetric flow rate and pipe diameter. Use it when sizing pumps, checking design velocities, or troubleshooting pipe systems. |