According to present specification, the rain garden system in a city is disclosed. Provide flood control type greenery system, its moderate rain garden system includes an equipment, it has a Leercia types device and a Cyperius type device, the working space that is designed and installed near a building and a city, such as one roof and a park shade tree a transmission units, and a water cell, in order to reduce overflow and a point pollution source and supply water to a plant when there is no rain to maintain a greenery patches for a long time.Copyright KIPO 2017
