United States Department of Transportation
i
Bridge Deck Runoff: Water Quality Analysis and BMP Effectiveness
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2010-12-01
[PDF-2.20 MB]
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TRIS Online Accession Number:01470846
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Edition:Final Report
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Abstract:The Alaska Department of Transportation (ADOT) is responsible for more than 700 bridges, most span water bodies. Are these water bodies affected by stormwater runoff from ADOT bridges? What are the regulatory and economic constraints on the ADOT regarding this runoff? What actions, if any, should the ADOT take? This report attempts to answer those questions. Best Management Practices (BMP) are mandated or recommended for certain bridges. Which BMP is best for each bridge is not defined in law, but requires selection by the ADOT after consideration of the bridge characteristics, costs and benefits of candidate BMPs, and practicalities of construction. In the body of this report are brief descriptions of many types of stormwater BMPs, including general (not road-related) BMPs, and road and highway related BMPs. There are fewer options for bridges and fewer still that will work in Alaska’s cold climate. The options can also be quite different for a bridge that is in service versus a bridge that will undergo major repairs or new construction. The project developed a database of all the state’s bridges and their parameters relevant to stormwater runoff. From those parameters a numerical rating was developed for each bridge. This rating, together with certain regulatory thresholds, is used to determine if BMPs are required.
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