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Storm Runoff
Peak storm water runoff for drains and culverts from area, runoff coefficient and rainfall intensity.
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About this test
Enter catchment area and rainfall.
How it's calculated
- Q = C·i·A / 360
Results are calculated from the values you enter using standard formulas. Download the PDF to keep a record. For certified testing, design or construction, talk to our engineers.
Cite this tool
Kataria Engineering & Consultancy Services (2026). Storm Runoff [online calculator]. https://katariaengineering.com/tools/storm-runoff-rational-method.html
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