How is it made?
A rain garden, also called a bioretention area, is a depression where rainwater runoff from nearby roofs and paved surfaces can collect and be absorbed. Plants filter the surface water and evaporate it through their leaves. This phytotechnology requires the use of highly versatile plants because conditions and contamination levels can vary widely: the gardens may be flooded with water loaded with salt or sediment, just as they may experience prolonged dry spells. The systems put in place must be able to handle these fluctuations in water quantity and quality