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This screen shot provides output data for the following permeable pavement design:

  • surface area = 3000 square feet;
  • soil porosity = 0.40
  • underdrain located 0.2 feet above the underlying soil;
  • HSG C;
  • drawdown time of 48 hours; and
  • no contribution from adjacent impervious surfaces or upstream BMPs.

Output includes the following:

  • Annual post-development TSS load, in pounds = EMC * surface area of peremable pavement = 54.50mg/L * 3000 square feet * conversion factor = 22 pounds
  • Annual TSS load received from upstream BMP, in pounds = 0 since there is no contribution from impervious surfaces;
  • Annual total TSS received by BMP = sum of the previous two terms = 22 pounds
  • TSS removed via non-volume reduction treatment = 74%
  • Total TSS removed via volume reduction and other treatment, expressed as a percent. This number is calculated by multiplying 74% by the fraction of infiltrated water passing through the underdrain by the fraction passing below the underdrain = 92% in this example;
  • Annual TSS reduction in pounds = the above term multiplied by the total TSS received = 0.92 * 22 pounds = 20 pounds; and
  • Remaining TSS load = Annual TSS received by BMP minus Annual TSS reduction = 2 pounds

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current09:20, 6 February 2013Thumbnail for version as of 09:20, 6 February 20131,413 × 500 (168 KB)Mtrojan (Talk | contribs)
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This page was last modified on 7 February 2013, at 17:34.

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