WMS:OC Rational Equation: Difference between revisions
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where: | where: | ||
* <math>Q</math> – peak flow <math>(ft^3/s or m^3/s)</math> | * <math>Q</math> – peak flow <math>(ft^3/s\ or\ m^3/s)</math> | ||
* <math>I</math> – rainfall intensity (in/hr, mm/hr) | * <math>I</math> – rainfall intensity (in/hr, mm/hr) | ||
* <math>F_m</math> – maximum [[WMS:OC Losses|loss rate]], where F<sub>m</sub> = a<sub>p</sub> * F<sub>p</sub> | * <math>F_m</math> – maximum [[WMS:OC Losses|loss rate]], where F<sub>m</sub> = a<sub>p</sub> * F<sub>p</sub> | ||
Revision as of 21:20, 13 February 2013
Flows for the Orange County rational method are calculated from the following equation:
where:
- – peak flow
- – rainfall intensity (in/hr, mm/hr)
- – maximum loss rate, where Fm = ap * Fp
- – 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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