WSP Water Solutions

Drinking Water Distribution 

Metropolitan Water Tunnel Program – Final Design Engineering Services Massachusetts Water Resources Authority (MWRA) | Massachusetts ■ Design of two major water supply tunnels ■ Geotechnical investigations ■ Permitting and environmental compliance WSP is providing comprehensive final design engineering services for the MWRA’s Metropolitan Water Tunnel Program, which is an initiative to enhance the reliability and resilience of the water system for over 3 million residents in 53 communities. The program involves the design of two major water supply tunnels, totaling approximately 15 miles of 10-ft diameter deep rock potable water pressure tunnels located 200 to 500 feet below ground. It also includes shafts, valve chambers, water main pipelines and appurtenances. WSP’s scope includes detailed geotechnical investigations, hydraulic and structural design, and preparation of bid-ready documents. The team also manages permitting, environmental compliance and stakeholder coordination. This effort addresses aging infrastructure and mitigates risk by creating alternative conveyance paths for treated drinking water. Through leveraging advanced modeling and innovative design practices, WSP is helping MWRA safeguard water quality and service continuity for the future.

Water Main and Water Meter Design Washington Suburban Sanitary Commission Pipe Design Division | Prince George’s and Montgomery Counties, Maryland

Delta Conveyance Project California Department of Water Resources | California

■ Water main design ■ 20 miles of rehabilitation, relocation and new installation ■ 10 water metering facilities

■ Modernizing California’s water infrastructure ■ Integrated engineering and environmental design ■ Sustainable material reuse strategy This project is a transformative water infrastructure initiative led by the California Department of Water Resources to modernize the State Water Project and secure long-term water reliability for over 27 million residents and 750,000 acres of farmland. The project involves constructing a 45-mile, 36-foot diameter tunnel beneath the Sacramento-San Joaquin Delta to convey up to 6,000 cubic feet per second of drinking water from the northern Delta to existing pumping facilities in the south. WSP serves as a key member of the engineering design management team, leading tunnel design and logistics coordination. Responsibilities include hydraulic structure design, levee stability assessments, bridge feasibility studies and conceptual planning for access routes via truck, barge and rail. WSP also supports environmental documentation and permitting efforts. A critical component of the project is the sampling and analysis plan for reusable tunnel material, which evaluates the reuse of tunnel excavated material for levee maintenance, habitat restoration and delta island fill. Hydraulic modeling and surge analysis ensure robust tunnel and drop shaft performance under emergency conditions.

WSP was selected by the Washington Suburban Sanitary Commission Pipe Design Division for a multi-year Indefinite Quantities Contract to support water system upgrades across Prince George’s and Montgomery Counties, Maryland. WSP evaluated and designed a new water distribution system and other water meter improvements. Under this contract, WSP has delivered 13 task orders covering approximately 20 miles of new, replacement, and relocated water distribution mains ranging from 4 to 16 inches in diameter, along with the design of 10 water metering facilities. The project involved designing and preparing contract documents (plans and specifications) for bidding and construction to remove and replace existing water supply mains, retrofit and connect them to the existing system, and transfer all services to the new mains. It also included design services such as utility locating, surveying, geotechnical investigation and corrosion analysis. Project areas included suburban, residential, and urban commercial, and include rail crossings and interfaces with state highways.

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