Inflow and Infiltration Abatement Requires Continuous Effort

Study suggests ongoing rehab is necessary for significant inflow and infiltration reduction.

Inflow and Infiltration Abatement Requires Continuous Effort

A study of rehabilitation effectiveness in Nashville found no failings of cured-in-place linings, but did note an overall drop in effectiveness of inflow and infiltration removal over a 12-year span.

After Nashville (Tennessee) Metro Water Services completed a sewer rehabilitation project in 1996, a long-term study showed that rehabilitation effectiveness decreased 7% over 12 years.

Early results showed 620 million gallons of infiltration, or approximately 35% of inflow and infiltration, were removed annually. At the end of the study, that number was down to about 28%, or 488 million gallons.

“The results could suggest that the level of effectiveness has deteriorated...

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