DC Water Tunnels for Clean Rivers

Contributed by Zaw Soeoo

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Anacostia River Tunnel ISCT Excavation

The District of Columbia Water and Sewer Authority (DC Water) distributes drinking water and collects and treats wastewater for more than 600,000 residential, commercial and governmental customers in the District of Columbia. As part of this mission, DC Water operates the Blue Plains Advanced Wastewater Treatment Plant (BPAWWTP), the largest such facility in the world. The Authority’s $2.6 billion long-term control plan for combined sewer overflows (CSOs), known as the DC Clean Rivers Project, captures CSOs and conveys them to the BPAWWTP for treatment. The Clean Rivers Project is comprised of a system of 20 miles of 23-foot-diameter tunnels at depths from 50 to 160 feet. HAKS is a member of the consultant construction management (CCM) team providing inspection services, including tunnel and near-surface construction, for both the Anacostia River and Blue Plains design-build tunnel projects. Giant tunnel boring machines (TBMs) are being used to bore the underground structures that form DC Water’s solution to CSOs. Continue Reading…