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Bi-County Water Tunnel
Project Name
Washington Suburban Sanitary Commission
Montgomery County, Maryland

Drinking Water Supply | Bi-County Water Tunnel

Bi-County Water Tunnel

Client: Washington Suburban Sanitary Commission
Location: Montgomery County, Maryland
Relationship: Since 1976

Black & Veatch uses its world-renowned tunneling experts to facilitate technical decision-making for a drinking water tunnel designed to last at least 100 years.

Black & Veatch drew upon its vast resources to design a major water system in the suburbs of Washington, D.C. Assembling a team of experts for the Washington Suburban Sanitary Commission (WSSC), Black & Veatch is helping WSSC address economic, environmental and community aspects of a major water conveyance system.

The final design consists of a 10-foot diameter deep rock tunnel, lined with an 84-inch diameter steel liner, which conveys drinking water for 5.6 miles along an interstate highway.

Black & Veatch performed a comprehensive evaluation, including technical requirements, alternative alignments, construction methods, environmental and community impacts, and cost and schedule requirements. The effort included collaboration with county policy stakeholders from Montgomery and Prince George’s counties in Maryland, and an extensive community outreach program.

Black & Veatch proceeded with an extensive geotechnical program and detailed design of the water tunnel, and the project is now in the construction phase. With the project slated to go on line in late 2013, Black & Veatch is providing construction administrative services and rock mapping.

To address the client’s unique geotechnical situation, Black & Veatch assembled a group of its world-class tunneling experts to act as an independent technical advisory panel and sounding board to WSSC and the design team. This group was engaged in workshops at critical milestones of the project.

“With Black & Veatch’s help, once completed, we will have installed a major transmission main designed to last at least 100 years, while minimizing community and environmental impacts as promised to the stakeholders during the design phase,” said John Mitchell, WSSC Project Manager.

“They were sensitive to community and political issues.”

John Mitchell / Washington Suburban Sanitary Comm.
Washington Suburban Sanitary Commission