Abstract

Stormwater management has shifted focus to 'starting from the source'. The concepts of low impact development (LID), better site design and 'smart growth', with the goal of producing site plans that reduce impervious areas and runoff volume, also address water quality. The LID based stormwater management program conveys the message that end of pipe structural Best Management Practices (BMPs) are the least desirable method for stormwater pollution controls, though these treatment BMPs play an important role.

In the past decades, structures BMPs have been proven successful in controlling stormwater runoff pollution. However, their success is offset by a prevalence of inadequate and inconsistent design criteria, which have resulted in the selection and installation of units whose performance does not meet expectations, and the units ultimately fail to protect receiving water bodies and aquatic environment from stormwater pollution to the degree intended. This chapter intends to demonstrate performance-based hydrology design methods for structure BMP, specifically the flow-through stormwater treatment unit (SWTU).

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