A big player for L.A. water   Roads & Bridges March 2003
The California Department of Transportation (Caltrans) builds and maintains some of the world's busiest highways, including the extensive Southern California freeway system. I-210 is one of these roads. In L.A.'s arid climate, rainfall events are infrequent but often intense, and the runoff is usually packed with all kinds of pollutants and trash. Caltrans engineers began looking at flow-based treatment devices, which accept a flow of water, put it through a treatment process, then release the water to continue its journey downstream.