WMS:OC Rational Equation
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Flows for the Orange County rational method are calculated from the following equation:
Q = 0.90(I - Fm)A
where:
- Q – peak flow (ft3/s or m3/s)
- I – rainfall intensity (in/hr, mm/hr)
- Fm – maximum loss rate, where Fm = ap * Fp
- A – catchment area (acres)
This equation is very similar to the traditional Rational Method equation. The term I - Fm is often referred to as the effective precipitation.
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