Combined sewage storage project to reduce overflows in Rock Creek Park
The results are in—green infrastructure projects achieved goals for stormwater runoff
Sewer separation will disconnect stormwater systems from the combined sewer system
Hi, I’m Moussa Wone, Vice President of the DC Water Clean Rivers Project, a 25 year water quality improvement program that dramatically reduces combined sewage overflows (CSOs - a mixture of raw sewage and rain water) into our District's waterways - the Anacostia and Potomac Rivers and Rock Creek.
The Clean Rivers Project is comprised of a system of deep tunnels, sewers and diversion facilities to capture CSO's and deliver them to DC Water’s Blue Plains Advanced Wastewater Treatment Plant. The Project is also installing Green Infrastructure to assist with the reduction of CSO's to the Potomac River and Rock Creek. The Anacostia River and Potomac River tunnel systems include more than 18 miles of tunnels that are larger than the Metro tunnels and are constructed more than 100 feet below the ground.
DC Water’s Clean Rivers Project involves the construction of innovative green infrastructure technologies that include bioretention (rain gardens) in planter strips and curb extensions, permeable pavement on streets and alleys, and downspout disconnection (including rain barrels). These practices will manage stormwater by taking advantage of the earth’s natural processes, such as allowing water to infiltrate into the soil, evaporate into the air, or for plants to use the water and expire it as vapor.
The Clean Rivers project is installing "diversion facilities" at strategic locations to capture untreated sewage from wet weather events and divert it to the new 157-million-gallon tunnel system and conveyed to the Blue Plains Advanced Wastewater Treatment Plant. Diversion facility components include a Diversion Chamber to intercept flow from the existing sewers, an Approach Channel to direct the flow and create a vortex, a Drop Shaft to drop the flow approximately 100 feet and an Adit to connect to the main tunnel system. The entire system works by gravity. During dry weather conditions, the existing sewer system uses its existing Dam and Interceptor system to deliver flow to Blue Plains for treatment.
1385 Canal Street, SE Washington, DC 20003