A research study conducted by the Center for Watershed Protection was released in September 2008 detailing findings and recommendations of a 3-year study on street sweeping and storm drain cleanout programs. The study, which was conducted in phases (literature review, program surveys, and field monitoring), cites the difficulty of the research endeavor due to factors such as street sweeping technology, frequency, and operating conditions. Results of the study focus on recommendations such as:

• targeting critical areas and times of years for sweeping/cleanout.
• implementing programs that redirect/treat stormwater before it reaches discharge system.
• expanding programs to maximize the reduction of leaf litter and prevent it from entering the storm drain.
• conducting additional research that focuses on evaluting current sampling techniques and developing alternative techniques.

The report can be read in its entirety for free here.