ABSTRACT
In this chapter, two major types of LID devices are introduced: (1) a porous pavement, and (2) a porous basin. A porous pavement is built on a flat surface to enhance flow interception, while a porous basin should be constructed with a pool 12 to 18 inches (30 to 40 cm) deep to store the WQCV. Underneath the porous bottom, the sub-base is assembled with multiple layers of filtering media to filter the water flow for better water quality. Ideally, a LID unit should have a drain time of 12 to 24 hours, depending on the local regulations of water rights.
