Rational Method Runoff Basics
Quando si applica
Use this guide for early drainage conversations when you must show assumptions for intensity, area, and coefficient transparently.
Strumento da usare
Browser-based preliminary check for Rational Method Runoff Calculator — fast estimates, not code or stamped design output.
Apri Rational Method Runoff Calculator →Passaggi
- 1Define catchment boundary and contributing impervious vs pervious fractions.
- 2Pick a design storm intensity and duration appropriate to local guidance.
- 3Choose a runoff coefficient consistent with cover type and slope.
- 4Compute peak flow and sanity-check magnitude with experience and alternate methods.
- 5Move to hydrograph routing when storage and timing effects dominate.
Esempi
- Parking lot inlet sizing discussion.
- Roof drain peak for a small building.
Cosa evitare
- Using rational method for very large basins without checking validity limits.
- Mixing intensities from different return periods without labeling.
- Ignoring downstream constraints while only sizing a pipe segment.
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Tutte le guide per attività oppure l’elenco completo nel hub Ingegneria.
FAQ
Is this code-compliant?
It is a teaching-oriented screening tool; local codes may require approved hydrology methods.
Snowmelt?
Not included; extend model when winter hydrology matters.