A rain garden is a bioretention shallow basin designed to collect, store, filter andtreat water runoff. To optimise its functions, it must include a porous soilmixture, native vegetation and some hyperaccumulator plants, capable ofphytoremediation.
This NBS can be easily built in areas like driveways, walkways, parking lots, compacted lawn areas, roofs, and residential gardens. Often the required location and storage capacity of the garden must be determined first.
Rain gardens get the recovery of the investment in about 5 years.