Controlling Highway Runoff Pollution in Drinking Water Supply Reservoir Watersheds

Report No: 00-R7

Published in 1999

About the report:

This study evaluated the effectiveness of an innovative stormwater best management practice in treating highway runoff and protecting the integrity of the drinking water reservoir in Warrenton, Virginia. The research focused on the use of a biodetention pond, which combines the concepts of detention ponds and bioretention in an attempt to provide higher overall pollutant removal. Storm event and background concentrations were all within or below the expected range for highway runoff pollutants and below Virginia's ambient maximum contamination levels for drinking water. The majority of the pollutant removal efficiencies were below values reported in the literature for well-designed wet/dry detention ponds and bioretention areas. Concentration comparisons for one storm event indicated serious problems with sediment re-suspension or short-circuiting in the biodetention facility. Design recommendations are made to potentially improve pollutant removal in the biodetention facility, and design guidelines are offered for future biodetention pond construction. In spite of pond short-circuiting and re-suspension, the study concludes that the biodetention pond adequately protects the integrity of the Warrenton Reservoir and is an innovative alternative for treating stormwater runoff.

Disclaimer Statement:The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.

Authors

Other Authors

Shaw L. Yu

Last updated: December 11, 2023

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