WMS:OC Rational Equation: Difference between revisions
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Flows for the Orange County rational method are calculated from the following equation: | Flows for the Orange County rational method are calculated from the following equation: | ||
Q = 0.90(I - | <math> Q = 0.90(I - F_m)A </math> | ||
where: | where: | ||
* Q – peak flow (ft<sup>3</sup>/s or m<sup>3</sup>/s) | * <math>Q</math> – 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> = a<sub>p</sub> * F<sub>p</sub> | * F<sub>m</sub> – maximum [[WMS:OC Losses|loss rate]], where F<sub>m</sub> = a<sub>p</sub> * F<sub>p</sub> | ||
Revision as of 21:07, 13 February 2013
Flows for the Orange County rational method are calculated from the following equation:
where:
- – 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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