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Norton Engineering Inc.

We love sewers.

Project to Reduce Unacceptable Inflow and Infiltration (Clean Water) in New Subdivisions

Barbara has been study the phenomenon of inflow and infiltration in brand new subdivisions since 2005, and has presented numerous papers on the topic at industry forums (WEF, WEAO, CWWA).  


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 Region of York, Region of Peel, City of London, City of Windsor and the Institute for Catastrophic Loss Reduction (ICLR).  For 2017, additional clients providing funding and support for this initiative include the Region of Halton, the City of Cambridge, the Region of Waterloo, and the Town of Orangeville.


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. This has significant, expensive, long term implications for municipalities, including compromising their ability to cope with the larger flows expected with the advent of climate change.  


Barbara, working with partner municipalities, has been interviewing municipal staff and stakeholders to determine the causes and conditions of this phenomenon, and to determine solutions to resolve it.  The project is ongoing.  Thus far, 35 out of 36 subdivisions flow monitored and provided to the team, exhibit unacceptable levels of I/I (as determined by the municipality).

Norton presents a webinar on a diverse range of topics, including I/I in New Subdivisions.

The Inflow and Infiltration in New Subdivisions 2015 to 2017 Report has now been published.  Please click the link below to read or download the .pdf