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, 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 York, City of London, City of Windsor and the Institute for Catastrophic Loss Reduction (ICLR). For 2018, additional clients providing funding and support for this initiative include the Region of Halton, the City of Cambridge, the Region of Waterloo, the Town of Orangeville, the City of Welland, InnServices and the NRC.
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. Forty out of forty-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 find solutions to resolve it.
As of 2018, this project is becoming national.