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Wastewater Infiltration and Inflow

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Infiltration and Inflow (I&I) occurs when excess ground or stormwater flows into the City sewer system. Due to aging infrastructure, the existing wastewater collection system is experiencing increased I&I.

Through the I&I Program the City hopes to achieve flow reduction at pump stations experiencing high I&I, and ultimately regain capacity lost at the G.T. Lohmeyer Wastewater Treatment Plant. Reduction of extraneous I&I flows will ultimately reduce the additional costs associated with wear and tear on pumping and treatment equipment, chemical consumption, additional maintenance, and energy.

This project includes the rehabilitation of gravity mains, sewer laterals and manholes for ten (10) initial pump station areas. These stations have been identified as high I&I pump station areas based on high pump run times due to excessive flows. Once the improvements are complete, the Public Works Department will monitor flows to show the rehabilitation impact on I&I reduction.

This effort will be a multi-year project, active from FY2014 through FY 2019, and may extend even later, depending on future funding availability.