A rain garden is simply a shallow depression in the yard planted with hardy perennials. The run-off from roof down spouts is channeled into the depression, where it slowly filters into the ground rather than running off into the storm sewer system. The depressions are generally less than six inches deep and easy to dig, especially since the removed soil can be used to form a low berm around the perimeter of the depression.

Depending on the soil type and sun exposure of the site, a diverse mixture of native perennial wildflowers and grasses is then planted and should flourish with minimal care.

Information on determining the size and placement of the rain garden as well as appropriate plants for the site can be found in books and on the web.