Source Control

The Maryland Department of Transportation State Highway Administration (MDOT SHA) uses source control best management practices (BMPs) to remove trash, sediments and other debris on roadway surfaces that contain pollutants before they are washed into adjacent waterways.

Street Sweeping

Mechanically sweeping the roadway removes trash, leaves, dirt, sand and other debris from curbs, gutters, and bridge parapets. The material is then properly removed to approved landfills. Street sweeping provides two benefits: first, it prevents buildup along roadways, allowing water to flow freely from highways into the drainage system. Second, it removes pollutants from passing vehicles or pollutants washed onto the roadway before they can reach local waterways.

 
Mechanical Street Sweeper
Mechanical street sweeper

Catch Basin and Inlet Cleaning

Catch basins and inlets are structures along closed storm drain systems that allow water to flow from the roadway surface into underground pipes (closed storm drains discharge runoff into open ditches, channels or waterways). Catch basins and inlets capture sediment and debris, preventing them from entering waterways. MDOT SHA cleans them periodically using vacuum trucks.
 

Before and after photos of inlet cleaning

Before
Before
After
After