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Projects

Broad Creek Water Conveyance

New infrastructure addresses environmental concerns.
  • Broad Creek Water Conveyance—Gannett Fleming

    Comprehensive evaluations were prepared before the upgrade.

Client
Washington Suburban Sanitary Commission
Partner(s)
Joint venture with Hatch Mott MacDonald
Location
Laurel, Prince George’s County, Maryland
Our Role
Design, Engineering, Public Involvement, Geotechnical Investigation, Construction Management and Inspection.
Data
Size:
5 miles of 42- to 48-inch force main
Completed:
In Progress
Type:
New Construction
Duration:
In Progress
Outcomes
  • Met accelerated schedule for 100 percent design drawings
  • Eliminated wastewater overflows
  • Protected sensitive environmental and historic areas.

The Broad Creek Pumping Station near Fort Washington, Maryland, pumps wastewater to the Piscataway Wastewater Plant for treatment. In recent years, heavy rainfall had sometimes caused untreated wastewater to overflow into local waterways. As part of a consent decree with the U.S. Environmental Protection Agency, the Maryland Department of the Environment, and multiple conservation groups, the Washington Suburban Sanitary Commission (WSSC) was required to eliminate wastewater overflows at Broad Creek.

As part of this work, WSSC constructed the 5-mile Broad Creek Augmentation Project Conveyance System, a sanitary pressure sewer, and force main that extended from the Broad Creek Wastewater Pump Station to the Piscataway Wastewater Treatment Plant.

What We Did

As part of a joint venture, Gannett Fleming developed and evaluated pipeline routing alternatives and implemented the final design. The study process involved close coordination with the Maryland State Highway Administration, Prince George’s County Department of Public Works, the Maryland-National Capital Parks and Planning Commission, the Maryland Department of the Environment, and other permitting agencies to determine potential constraints to the suggested alternatives. The final two alternatives were evaluated in detail, including survey work and tax map investigation, traffic studies and intersection capacity analysis, forest and wetland delineation, environmental impacts, utility location and relocation, and geotechnical investigations to determine soil and groundwater conditions. To streamline acceptance, the team participated in regular meetings with WSSC staff and other agencies, as well as community residents and businesses.

Key Features

  • New parallel conveyance system included a 48-inch force main, 60-inch gravity sewer, and 42-inch pressure sewer
  • Sections of the pipeline run through sensitive environmental areas and cross through National Park Service lands in a historic district
  • To minimize impact, micro tunneling was utilized for installation of seven sections of the conveyance system for total tunneled length of 6,400 feet.

Similar Projects: Wastewater: Interceptors, Force Mains, & Collection Systems, Water/Wastewater: Wastewater, Water/Wastewater, Engineering: Water/Wastewater