Excavation for the $700M Lake Mead Intake No. 3 Project was put on hold after tunneling encountered a fault carrying groundwater that flooded the excavation and submerged equipment. The flooding occurred over about 4-days, so there were no injuries reported. The Southern Nevada Water Authority ‘Third Straw’ project will secure the Lake Mead water supply for thirsty Las Vegas in the face of declining lake levels. The contractor will drill into the fault and grout it so the water can be pumped out and work can proceed. Check out this interesting SNWA project overview video for the ‘Third Straw’ project. [Source: Las Vegas Sun via ASCE SmartBrief. Image: Southern Nevada Water Authority]
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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)
Caldecott Tunnel fourth bore nears end of big dig
August 22, 2012
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