Stormwater Runoff Volume Calculator
Calculate the volume of stormwater runoff using rainfall depth, surface area, and a runoff coefficient.
Approximate calculation; local regulations may require detailed hydrologic studies.
Examples
- Area 1000 m², rainfall 50 mm, coefficient 0.9 ⇒ 45.00 m³
- Area 500 m², rainfall 20 mm, coefficient 0.3 ⇒ 3.00 m³
FAQ
What is the runoff coefficient?
It represents the fraction of rainfall that becomes runoff.
Can I use inches and square feet?
Yes, convert to meters and millimeters before calculating.
Does this consider storm duration?
No, it estimates volume from total rainfall depth only.
Additional Information
- Runoff coefficient reflects surface permeability.
- Useful for drainage planning and flood mitigation.