Compare calculators
Both calculators run independently β 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
Water Pipe Flow Calculator
Calculate flow rate in a pressurized water pipe using the Hazen-Williams equation. Used by plumbing and civil engineers to size distribution mains, evaluate pump systems, and check hydraulic capacity.
Fill in the required fields to see your result.
Key differences
| Storm Water Runoff Calculator | Water Pipe Flow Calculator | |
|---|---|---|
| Category | Civil | Civil |
| Inputs required | 3 | 4 |
| Result | Peak Runoff Flow (cfs) | Flow Rate (gpm) |
| 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. | Calculate flow rate in a pressurized water pipe using the Hazen-Williams equation. Used by plumbing and civil engineers to size distribution mains, evaluate pump systems, and check hydraulic capacity. |