"IF YOU ONLY DO ONE THING, COLLECT RAINWATER" ~ Bill Mollison
Did you know only 1 inch of rain on a 1000 square foot roof creates about 625 gallons of water?!? With a rain barrel, you can collect some of it to water the plants in your yard. Plants love the soft, chlorine-free, warm (compared to water from a hose) water.
You'll love saving money on your water bill. And knowing you're contributing to a healthier environment by reducing runoff, pollution, and flooding.
Rain barrels usually cost between $50 and $150, depending on how fancy you get. You can even make your own from a food-grade barrel or trash can and a few parts from the hardware store for probably $30 or so.
Special diverters can cost $20-$40, though you don't have to have one. And platforms to put them on can be a few dollars worth of cinder blocks, or as elaborate as you want to make it.
Rain barrel information from the EPA
Rainwater Harvesting information
Rain Barrel Guide
Rain Barrel Installation and Maintenance
Make Your Own Rain Barrel