Greening the Grey — a green infrastructure success story

The pioneering infrastructure project to upgrade Washington DC’s combined sewer system used green infrastructure to reduce capital cost and build resilience to future flood risk. DC Water, the District of Columbia’s Water and Sewer Authority, adapted the $2.6 billion-dollar project to incorporate $100 million dollars of green infrastructure.

Combined Sewage Overflow discharge point into the Potomac River, Washington, DC. Image credit: M.V. Jantzen. CC by 2.0.
Graphic showing how heavy rainfall causes sewage and rainwater to flow in to Washington DC’s rivers
How heavy rainfall causes sewage and rainwater to flow in to Washington DC’s rivers
A bio-retention planter in a pavement in Washington DC
A bio-retention planter and semi permeable pavement design. Picture: DC Water
Graphic showing how an Environmental Impact Bond works
How the Environmental Impact Bond works

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