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| Flows for the Orange County rational method are calculated from the following equation:
| | #redirect [[WMS:Orange_County_Rational_Method#OC_Rational_Equation]] |
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| <math> Q = 0.90(I - F_m)A </math>
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| where:
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| * ''Q'' – peak flow (ft<sup>3</sup>/s or m<sup>3</sup>/s)>
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| * ''I'' – rainfall intensity (in/hr, mm/hr)
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| * ''F<sub>m</sub>'' – maximum [[WMS:OC Losses|loss rate]], where ''F<sub>m</sub> = a<sub>p</sub> * F<sub>p</sub>''
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| * ''A'' – catchment area (acres)
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| This equation is very similar to the traditional [[WMS:Rational Method Equation|Rational Method equation]]. The term ''I - F<sub>m</sub>'' is often referred to as the effective precipitation.
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| ==Related Topics==
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| * [[WMS:OC Losses|Losses]]
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| {{WMSMain}}
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| [[Category:OC Rational|E]]
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| [[Category:Equations|OC Rational]]
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