WMS:OC Rational Sub-area Data

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Revision as of 23:45, 7 March 2013 by Jcreer (talk | contribs) (→‎Losses)
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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

  • – The time of concentration (min)
  • Intensity – The rainfall intensity (in/hr) is automatically computed based on the

Losses

  • – Pervious area percentage
  • – Pervious area loss rate
  • – Maximum area loss rate

Calculate by toggling on the Compute checkbox, entering values for and , and using the Compute button or click on the Compute – GIS button to use GIS data.

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