The MnDOT Bridge Office sought out information on best practices regarding the use of drainage systems on bridges. Minnesota regulations strongly discourage the discharge of runoff directly into waterways; however, bridge drainage systems can lead to accelerated deterioration in bridge elements. MnDOT requested a synthesis to gather information to assist them in future development of guidance on design, detailing, specifications, construction, and maintenance procedures for bridge needs, focusing specifically on agencies with similar northern climates to the greatest extent possible.
This Transportation Research Synthesis (TRS) provides an overview of relevant literature, regulations, guidance, and other information related to a specific stormwater Best Management Practice (BMP): underground infiltration systems with sump manhole pretreatment. This TRS is intended to serve as part of the justification to prompt a review of this practice and related practices in the context of a revision to the Minnesota Stormwater Manual (MSWM).
