Urban Water Circulation

Rain Garden


It is a technology element that effectively manages rainwater and improves the urban landscape by trapping rainwater as much as possible in the ground and allowing it to permeate. An artificial drainage system is unnecessary by maintaining the optimum permeability of moist soil, but the facility can be connected with vegetation waterways

Features and Benefits

  • Groundwater cultivation effect by reducing peak flow during rainfall and allowing runoff to permeate into the ground
  • Effective in removing suspended solids, heavy metals and absorbed pollutants
  • Maximize the aesthetic effect by creating natural landscapes to improve the quality of residence

Inspection and maintenance

  • Applicable to roadside green space, median zone on the road, parking lot island, green space within the complex, and park green space
  • Intensive management is required at the beginning, but gradually decreases
  • In winter, the ground may freeze, so runoff should not flow into the vegetation area.

Processing efficiency

BOD T-N T-P Runoff reduction(Q) TSS Etc
23~54% 22~49% 17~81% 40% 80% Zn 99%
Pb 99%

* Bioretention Basin Practics (Vinginia Tech, 2011)
* Citation of rainwater gardens in the Technical Guidelines for Total Water Pollution Control (2012.8)
* The Practice of Low Impact Development(HUD's Office of Policy Development and Research, 2003)
* Dane county erosion control and stormwater management manual(2007.3)

Application examples