WMS:OC Rational Equation: Difference between revisions

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where:
where:


* <math>Q</math> &ndash; peak flow <math>(ft^3/s or m^3/s)</math>
* <math>Q</math> &ndash; peak flow <math>(ft^3/s\ or\ m^3/s)</math>
* <math>I</math> &ndash; rainfall intensity (in/hr, mm/hr)
* <math>I</math> &ndash; rainfall intensity (in/hr, mm/hr)
* <math>F_m</math> &ndash; maximum [[WMS:OC Losses|loss rate]], where F<sub>m</sub> = a<sub>p</sub> * F<sub>p</sub>
* <math>F_m</math> &ndash; 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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