Rain gardens, shallow depressions containing bark mulch and shrubs, can remove up to 99% of toxins from rainwater run off. With built-up urban areas generating nine times more runoff water than woodlands of a similar size anything that can act as a buffer has to be welcomed.
Technorati tag: Water Runoff, Rain Garden
One of the best raingarden development programs in the United States is run by the West Michigan Environmental Action Council. You can check them out at http://www.wmeac.org
Peace,
Jerome