In their October 2010 cover story, Tunnel Business Magazine (TBM) had this article on the construction of the Washington, D.C. Metro system. They describe how this was the first use of the NATM in the U.S., and the first use of earth pressure balance TBM’s based on Japanese technology. It’s an interesting article. [Source: Tunnel Business Online. Image: TBM Magazine]
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12 Miles of Tunnels for D.C. Sewer
In Washington D.C., the D.C. Water and Sewer Authority (D.C. WASA) finalized a lont-term plan in 2002 aimed at reducing combined sewer outfalls into the Potomac River and its tributary, the Anacostia River. A major portion of this plan is a $2.2 Billion (US) deep tunnel program to handle excess stormwater flows and prevent the combined sewage from being discharged into the environment. Read on for a map and more info. (Photo of Anacostia River, by D.C. WASA)
Workers try to repair the sinking sea wall at the Jefferson Memorial
June 9, 2010
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