ABSTRACT
The conventional stormwater design has been focused on how to reduce peak flows using stormwater detention, while the latest development in the concept of low-impact development (LID) is to integrate various infiltrating and filtering designs to reduce the increased runoff volume. An LID design is to apply a filtering process to enhance stormwater quality and an infiltration process to reduce stormwater volume. Since the 1990s, the urban stormwater management has rapidly changed from the conventional concerns on flood flow mitigation to a new focus on urban runoff quality enhancement. The main objective in the design of a stormwater quality-control basins (WQCB) is to maximize the runoff volume captured. However, this objective leads to the conclusion that the larger the basin, more the runoff volume captured. A detention basin designed for flood control would only focus on flow releases for the 10- to 100-year events. This chapter provides an example to illustrate the retrofitting procedure applied to the existing detention basin.
