WMS:OC Rational Sub-area Data: Difference between revisions

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===Losses===
===Losses===
* '''<math>a_p</math>''' &ndash; Pervious area percentage
* '''a<sub>p</sub>''' &ndash; Pervious area percentage
* '''<math>F_p</math>''' &ndash; Pervious area loss rate
* '''F<sub>p</sub>''' &ndash; Pervious area loss rate
* '''<math>F_m</math>''' &ndash; Maximum area [[WMS:OC Losses|loss rate]]
* '''F<sub>m</sub>''' &ndash; Maximum area [[WMS:OC Losses|loss rate]]
Calculate <math>F_m</math> by toggling on the ''Compute <math>F_m</math>'' checkbox, entering values for <math>a_p</math> and <math>F_p</math>, and using the '''Compute <math>F_m</math>''' button or click on the '''Compute <math>F_m</math> &ndash; GIS''' button to use GIS data.
Calculate F<sub>m</sub> by toggling on the ''Compute <math>F_m</math>'' checkbox, entering values for a<sub>p</sub> and F<sub>p</sub>, and using the '''Compute F<sub>m</sub>''' button or click on the '''Compute F<sub>m</sub> &ndash; GIS''' button to use GIS data.


==Related Topics==
==Related Topics==

Revision as of 15:28, 16 October 2017

Orange County Rational Method – Edit Parameters dialog

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 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


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