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Application of a Simplified Analysis Method for Natural Dispersion of Highway Stormwater Runoff

Description: This paper focuses on evaluating natural dispersion runoff infiltration performance by utilizing simulated rainfall/runoff data collected using a field-scale rainfall simulator coupled with a numerical model to study the effects of slope length, angle, and impervious contributory area on natural dispersion applications. A simplified equation was established, termed the LID Design Equation, to analyze natural dispersion performance based on multiple variables that can be determined for site specific conditions, allowing highway engineers to tailor natural dispersion requirements to various locations throughout Washington. Furthermore, the research and resulting evaluation procedure indicate that current evaluation procedures for the use of natural dispersion as a viable stormwater quantity control strategy are not physically accurate.

  • Date Published: August, 2005
  • Publication Number: WA-RD 618.1
  • Last Modified: April 15, 2007
  • Authors: Mitch Reister, David Yonge.
  • Originator: Washington State Transportation Center (TRAC)
  • # of Pages: 58 p., 1,144 KB (PDF)
  • Subject: Equations, Dispersion (Statistics), Hydrologic phenomena, Impervious soils, Infiltration, Length, Rainfall, Runoff, Slopes.
  • Keywords: Low impact, infiltration, highway runoff, stormwater runoff, natural dispersion.
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This abstract was last modified January 26, 2009