A rain garden* is a kind of garden that primarily serves as area for water control (storage and infiltration) on a small-scale especially in urban areas. Rain gardens are established in artificial surroundings and catches water runoff from roofs, roads and other (sealed) surfaces. Storm water runoff is drained into rain gardens, where it is stored for a certain period, and infiltrates either into the ground soil or flows into the sewage system. A certain amount of water is taken up and transpired by plants. Different designs/arrangements of rain gardens are established and a variety of elements is used to create a rain garden such as grass filter strips, water ponds, mulch areas, planting soil, plants (e.g. herbaceous plants) or sand beds. All the mentioned elements have a particular function for example slow down, reduce, filter and store water runoff or increase evapotranspiration. Beside their function to store and infiltrate storm water, rain gardens have esthetical functions (amenity value). Raingardens are not restricted to a certain climate condition and can be found in different European countries. But, the selected components (plants) should be native and well adapted to local climate conditions.
* In literature refers to as bioretention area (source: (European Commission n.d.a)
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