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...
