On 09.04.2013 the District of Columbia Water and Sewer Authority (DC Water) named its massive Blue Plains Tunnel TBM Lady Bird, christened it with DC tap water, and prepared to send it underground to tunnel more than 7 km along the Potomac at a depth of approximately 30.5 m. The machine is 122 m-long and weighs 1,300 t. The tunnel is part of DC Water’s Clean River Project to significantly reduce combined sewer overflows (CSOs) and improve water quality in the District of Columbia. Click here and us/109. Visit http://www.dcwater.com. 17/13.