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Growth in the Community of Elmira, Region of Waterloo, Ontario, Canada has been limited in recent years by insufficient wastewater treatment capacity and capacity constraints within the existing system. Significant extraneous infiltration/inflow (I/I) was experienced within the system, resulting in basement flooding and bypassing of untreated sewage to the receiving stream.

In 1995, Stantec undertook a detailed I/I study that included extensive flow monitoring, house to house surveys, and analysis of both dry weather and wet weather flows. The primary source of I/I was identified as foundation drains connected to the sanitary sewer system. A Pilot Project was developed by Stantec to estimate potential reductions in the sanitary sewer flows with private side foundation drain disconnection. Results of the Pilot Project were extrapolated and an I/I reduction program, with specific reduction targets, was developed. Since the Elmira WWTP was at capacity and an expansion was required, Stantec proceeded with an holistic look at the entire wastewater collection and wastewater treatment system in order to develop a comprehensive Total Solution.

Document Type: Research Article


Publication date: 2002-01-01

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