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What is a Rain Garden?

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A rain garden is a water drainage system that directs water towards a garden. The garden soaks up and purifies water resulting in cleaner water flowing to area rivers, streams, canals, lakes, ponds and harbors. Rain gardens may also help to cool urban heat islands.
Plants in a rain garden are typically wetland edge vegetation selected to to match the local ecosystem. Soil is selected for its permeability and filtration properties. A rain garden may also include links to drainage infrastructure or local drainage features such as a dry well.
Overview: Rain Garden
Type
Urban Design
Definition
A drainage system that directs water to a garden.
Value
Flood prevention
Water purification
Drought prevention
Cooling of urban heat islands
Notes
Rain gardens are usually passive systems that drain water by virtue of being physically lower than their surroundings.
Related Concepts
Sustainable Design
Urban Design
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