Inflow & Infiltration Pilot Study

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A technical look at I/I sources in Lincoln and potential reduction strategies

Inflow and infiltration (I/I) is a well-documented challenge in Lincoln, as evidenced by the increased sanitary sewer flows experienced during and after heavy rainfalls.

Ohio State Waterproofing, October 11, 2016

The City of Lincoln is working with JEO Consulting Group to conduct a pilot inflow and infiltration study that will:

  1. Identify the sources of I&I in the study area.
  2. Provide technical recommendations for effective I&I reduction in the study area.
  3. Determine best practices for cost-effective, system-wide I&I reduction.

The study will include technical investigations and testing of public infrastructure, as well as estimate the degree to which inflow and infiltration occurs in public or private infrastructure.

Residents in the study area can expect to see members of the project team in the area to conduct smoke testing, dye testing, manhole assessments, and closed-circuit-TV review of sewer pipes.

Participation from residents in the study area will be essential to the collection of needed data and the development of recommendations for inflow and infiltration reduction.

  • Residents will be asked to voluntarily contribute to the data collection phase by providing information about sump pumps, roof drains, and other potential I/I sources. This data willl provide the project team valuable data that could help reduce the risk of future sanitary sewer overflows in Lincoln.
  • The City of Lincoln will provide participating properties two months of FREE wastewater service to thank residents for their contributions.

The study area is N. 28th St. to N. 31st St. from Holdrege St. to Potter St.

Study area map

The selected study area is ideal for this pilot project because it:

  • Is located in a drainage basin that has historically experienced sanitary sewer overflows and basement backups due to large rainfalls.
  • Is at the top of the wastewater drainage basin, meaning only the I/I and wastewater generated in this area flows through the meter collecting data for the study.
  • Includes a mix of older, middle-aged, and newer homes, as well as an elementary school.

Project Contact

For more information contact Brian Kramer at or 402-441-7961.