Innovative Twin-Pipe Design to Serve Short Term and Long Term Operating Needs

The Zone 4 Feedermain project was identified in Halton Region’s (Ontario, Canada) 2011 Sustainable Halton Water and Wastewater Master Plan. It is required to supply water to the proposed Zone 4 Reservoir near No. 5 Side Road and Trafalgar Road in the town of Halton Hills which will serve Zone 4 in the town of Milton and ultimately south Georgetown (town of Halton Hills). The feedermains comprise approximately 3,100 m of 1,200 mm diameter prestressed concrete pressure pipes (PCPP), 7,070 m of twin 900 mm diameter PCPP, and 2,760 m of 900 mm diameter PCPP. This paper showcases an innovative design of adopting a twin watermain pipe system to serve both the short term and long term operating needs of Halton Region. The twin pipe design enabled Halton Region to maximize the use of their existing infrastructure, while providing the network with system redundancy to meet future requirements.