City of Hamilton—Woodward Greenhill 2,250 mm (90 in.) Feedermain Leak Repair

The Woodward Greenhill Feedermain is a 90-in. (2,250 mm) Prestressed Concrete Cylinder Pipe (PCCP) that supplies water to Hamilton's Greenhill Reservoir. The city has a proactive inspection plan for its large-diameter feedermains, utilizing inline inspection tools to detect leaks and wall distress. In November 2023, a SmartBall leak detection inspection indicated a potential large joint leak. In August 2024, Pure Technologies was engaged to confirm the leak using the Sahara tethered inspection tool, which revealed an acoustic leak event at the same location. Following these inspections, the City initiated a project for an Options Analysis to repair the 2,250-mm WGFM on Nash Road North. The analysis evaluated repair methods, determining Carbon Fiber Reinforced Polymer (CFRP) as the preferred rehabilitation option based on a risk assessment of the alternatives.