I&I Archives - Infrastructure Digest

Using Grout to Stop I/I

The Village of Ashley project resulted in the Central Ohio Wastewater Services crews in finding significant I/I at the manholes. Crews found 17 manholes next to a creek in the woods that were 16 to 26 ft deep with a very high water table. In looking into the cost for replacement for all the manholes, the cost totaled approximately $300,000.

“The Village of Ashley did a (cured-in-place pipe) CIPP liner project in 2007, removing half the peak flow from 1 million gal/day to 500,000 gal/day at a plant that was designed for 190,000 gal/day,” Howard explains. “We found the infiltration was coming between the CIPP liner and the original pipe releasing at the manholes. The acting engineer at the time had heard of Source One Environmental (S1E) LLC and its product so we gave it a try. Since the start of the project, our average dry time flows have went from 60,000 gal/day to 30,000 gal/day and heavy rain fall events have fallen from 500,000 gal/day to 250,000 gal/day making the plant more efficient.”

Why should you read this? The effectiveness and precise role of chemical grouting is too little understood by sewer network managers, IMNSHO. Trenchless Technology, November 2014

Technology and Its Impact on Reducing Inflow and Infiltration

“Fixing I&I defects in collection systems with multiple I&I sources can be complicated. With the advancement in sewer line rehabilitation, removing the I&I is more affordable than in the past. Further, if you add in the potential costs of I&I to the environment and to the impact on a community’s growth and quality of life, I&I reduction is a high value, necessary investment.

The EPA estimates that if the nation’s infrastructure needs are not addressed in the next 10 years, 35 years of water quality gains will be lost. Even though removing I&I can be a net cost-saver, the work required to remove it from a sewer system isn’t cheap. Municipalities need to be strategic in designing their I&I remediation efforts and do whatever they can to minimize the cost impact of the program on ratepayers and taxpayers. Today’s technologies are playing a large part in closing this gap, and we can all expect the coming years to produce even greater technologies to address our infrastructure needs.”

Why should you read this? Useful overview of current technologies that help to prioritize and maximize I&I reduction investments. Trenchless Technology, November 2012

Military Precision

“In March, work crews installed 41 flow monitors throughout the fort’s sewer collection system to identify leaks in the 91.2 miles of main sewer line serving the U.S. Army Base… It’s all part of a $2 million Sanitary Sewer Evaluation Study (SSES) under way at Fort Knox.” Good look at I&I program at Fort Knox, including the world famous ‘sewers o’ gold.’ MSW August 2012

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