WMS:OC Rational Equation: Difference between revisions
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where: | where: | ||
* ''Q'' – peak flow < | * ''Q'' – peak flow (ft<sup>3</sup>/s or m<sup>3</sup>/s)> | ||
* ''I'' – rainfall intensity (in/hr, mm/hr) | * ''I'' – rainfall intensity (in/hr, mm/hr) | ||
* ''F<sub>m</sub>'' – maximum [[WMS:OC Losses|loss rate]], where < | * ''F<sub>m</sub>'' – maximum [[WMS:OC Losses|loss rate]], where ''F<sub>m</sub> = a<sub>p</sub> * F<sub>p</sub>'' | ||
* ''A'' – catchment area (acres) | * ''A'' – catchment area (acres) | ||
Revision as of 16:03, 9 December 2016
Flows for the Orange County rational method are calculated from the following equation:
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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