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Norton Engineering Inc.

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Inflow & Infiltration in New Construction

Unacceptable Inflow and Infiltration (Clean Water) is Entering Sewers in Brand New Construction

Barbara has been studying the phenomenon of inflow and infiltration in brand new sanitary sewers since 2005, and has presented numerous papers on the topic at industry forums (WEF, WEAO, CWWA, NRC, NWWBI, OPIA, OBOA, ICLR Board, etc.).  

Once establishing Norton Engineering, Barbara initiated the development of a "Project to Reduce Unacceptable I/I in New Subdivisions" with direct funding from and working closely with the Region of Peel, Region of YorkCity of London, City of Windsor, Institute for Catastrophic Loss Reduction (ICLR), Region of Halton, City of Cambridge, Region of Waterloo, Town of Orangeville, and Region of Niagara.

Through flow monitoring at the downstream end of new subdivision sanitary sewers across Ontario (and likely beyond), it has been determined that new subdivisions are "leaking" and allowing unacceptable levels of groundwater and rainwater to enter these pipes. Fifty out of fifty-one subdivisions for which flow monitoring has been collected exhibit unacceptable (as determined by the municipality) levels of I/I. This has significant, expensive, long term implications for municipalities, including compromising their ability to cope with the more frequent and peakier rainfall events expected with the advent of climate change.  

Barbara has been dissecting specific issues identified in the original study, including examining the significant differences between specifications on the public side versus the private side (the public side specifications being significantly more stringent). Barbara is working with municipal engineering and building staff and stakeholders to understand the underlying causes and conditions of this phenomenon, and to develop solutions to resolve it. 

Norton works directly with various clients to assist in assessing and resolving I/I in new construction, including City of Welland, Innservices, Town of Lincoln, BC Housing, Metro Vancouver and others.

In 2018, projects have started with both Standards Council of Canada and National Research Council to take this work across Canada.

Recent Presentations and Publications