How to Build a Rain Garden
The function of gardens is usually growing food and flowers, but your patch of green can also serve an environmental function—helping reduce flooding and curb water runoff. Growing spaces that perform this function are commonly known as rain gardens. These gardens are shallow, sunken plots of land that act as a reservoir for storm water that is not absorbed by surfaces such as sidewalks, driveways or decks. Natural land spaces such as forests and wetlands can capture and filter out toxins...
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Source: modernfarmer.com