// multi-utility computation suite · offline · instant · precise
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sci.stormwater-rational-method Calculator
Calculates peak stormwater flow using the Rational Method Q = C × i × A, and estimates pollution loads from event mean concentration and runoff volume. Stormwater quality management uses first-flush treatment to capture the most polluted initial runoff, typically the first 12–25 mm.
Inputs
C Runoff
Reference formula or conversion factor shown for context.
I Mm Per Hr
Reference formula or conversion factor shown for context.
A Ha
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Results
peak runoff Q (m³/s)
Sample size or count used in the calculation.
peak runoff Q (L/s)
Sample size or count used in the calculation.
indicative pipe diameter (mm)
The computed diameter -- twice the radius.
Q = C·I·A/360 (SI rational method)
The recommended calculation method or analytical approach for these conditions.