WMS:OC Rational Sub-area Data
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When setting up a Orange County Rational Method simulation, data must be entered for each sub-area.
Area: The sub-area area (acres or ha.) can be automatically computed when using a DEM or TIN
% Nonmountainous and % Mountainous: The percentage of the sub-area that lies below and above 2000 ft, respectively. Use the Compute % Mountainous button to calculate these values using a DEM or TIN.
Initial Sub-area
- Tc: The time of concentration (min)
- Intensity: The rainfall intensity (in/hr) is automatically computed based on the Tc
Losses
- ap: Pervious area percentage
- Fp: Pervious area loss rate
- Fm: Maximum area loss rate
- Calculate Fm by toggling on the Compute Fm checkbox, entering values for ap and Fp, and using the Compute Fm button or click on the Compute Fm - GIS button to use GIS data.
Related Topics
- Losses
- Initial Sub-area Time of Concentration
- Orange County Rational Equation
- Orange County Rational Method
- Reach Routing
- Creating Watershed Models
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