How do rain gardens work?

Stormwater flowing along the curb flows through a 'curb cut' into the depressed area of the rain garden. The stormwater runoff is filtered by the soil and plants. In most storm events, this water soaks into the ground. In larger events the water pools until it eventually overflows back to the gutter.

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1. What is a rain garden?
2. How do rain gardens work?
3. What is permeable asphalt?
4. What is compost amended soil?
5. What is a green roof?
6. What is tree preservation?