For a year, San Diego city officials collected storm water in 24 rain barrels in eight sites across the city to analyze their effectiveness in reducing runoff and harvesting water.
They found that the rain barrels significantly reduced the flow of pollutants to storm drains as they redirected rain to landscaped areas.
San Diego is in the early stages of studying programs like a successful rain barrel program in Los Angeles to learn best practices to reduce runoff to watersheds. San Diego also is looking at rain gardens and other methods of "rainwater redirection."
Read more and also read the rain barrel pilot study report.