Here's a really cool example of a watershed restoration project in Calabasas (CA) in the Las Virgines Creek, which is a tributary to Malibu Creek. The site is at Highway 101 and Las Virgnes road. This should increase riparian habitat, encourage water quality improvement, reduce thermal pollution, and encourage groundwater recharge.
Images and info. submitted by Syd Temple, who was design engineer on this project and a Surfrider Foundation member.