Bridge Stormwater Runoff Analysis and Treatment Options (2014) / Chapter Skim
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Pages 24-35
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From page 24... ...
24 Stormwater and Other Source Control Practices to Consider for All Bridges The objective of this chapter is to present BMPs that should be considered for all bridges, as appropriate, depending on the setting and the type of bridge construction. These source control, operation, and maintenance practices will avoid or reduce loading of pollutants to the receiving water.
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25 locations. Since most bridge down drains are relatively small in diameter, a riprap apron consisting of suitably sized rock on top of a filter blanket would be an effective approach when placed at the outlet, and computing scour hole dimensions as detailed in HEC 14 would not be necessary.
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26 (Sacchi et al.
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27 Bats are often found roosting under bridges and their presence may need to be controlled. In some locations, bats may only be managed by licensed pest control services.
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28 corrosion protection without the need for either initial or maintenance painting (Kogler 2012)
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29 activities for dry weather, and test and inspect spray equipment prior to starting to paint. Tighten all hoses and connections and do not overfill the paint container.
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30 be removed through an aggressive street sweeping program. Street sweeping issues will be discussed in Section 4.4.4.
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31 to salt application, and how plowing influences the need for re-application. Pre-wetting salt with brine speeds the reaction time of salt and keeps salt from bouncing off the road so more of it is available to melt the ice and snow.
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32 transfer the debris into the hopper. Research has shown that these machines are significantly more effective at removing sediment, nutrients, and metals than standard mechanical sweepers (Weston Solutions 2010)
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33 Protection (2002) provided removal effectiveness data from studies performed by the Center for Watershed Protection.
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34 primary use is on bridges where there is sufficient longitudinal slope to avoid flooding the travel lane if the scuppers are plugged during runoff. For bridges that require the scuppers to fulfill dry lane criteria, maintenance crews must quickly remove the plugs to allow for drainage if a storm is forecast.
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From page 35... ...
35 tion of sediment. Measures similar to abutments are required for the inspection of piers.
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