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Hydrology2D

Runoff - Theory & Concepts - Rational Method Calc

Catchment characteristics, runoff components, and the Rational Method.

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Rational Method Calculator

Q = 0.695 m³/s

Peak Discharge

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Runoff Coefficient (C)0.5

0.1 (Parks) to 0.9 (Pavements)

Intensity (I)50 mm/hr

Area (A)10 ha

Formula:

Q = 0.278 C I A

(Note: This simple version assumes A is converted to km² internally for the 0.278 constant)

Introduction to Hydrology - Theory & Concepts - Water Balance Precipitation - Theory & Concepts - Areal Precipitation Precipitation - Theory & Concepts - I D F Curve Hydrologic Losses - Theory & Concepts - Evaporation