Projects
Falls Street Tunnel Infiltration Evaluation Report
McMahon & Mann served as geotechnical consultant to the Niagara Falls Water Board (NFWB) to evaluate potention options to reduce grounwater infiltration into their Falls Street Tunnel (FST). The FST is an unline rock tunnel that conveys sewage from east to west along Falls Street, over the New York Power Authority (NYPA) conduits, to the Niagara Gorge.
McMahon & Mann reviewed available groundwater and geology information for the area, historical information about the design and construction fo the FST and the NYPA conduits, and performed subsurface explorations which included collection of rock core samples and completion of in-situ permeability tests.
We evaluated the effects of groundwater infilttration reduction options on local groundwater conditions, industrial groundwater contamination migration, and the effects on structures in the vicinity of the tunnel. McMahon & Mann developed additional recommendations to limit infiltration into the FST.