People are including rain barrels in their gardening plans because they are an inexpensive, easy way to save water for landscaping and prevent roof water from entering the pollution stream. With a 1,000 square foot roof, a quarter inch of rain can generate 150 gallons of water; and you can collect about 50 gallons of that by diverting only one of your downspouts to a rain barrel. Learn about stormwater management techniques, the value of conserving water, and the basic skills needed to install a rain barrel at home.