St. Louis Tightens its Collections System

Monitoring, modeling and budgeting help Metropolitan Sewer District reduce the flow.

St. Louis Tightens its Collections System

A tunnel boring machine is lowered into a 30-foot shaft on the Upper Maline Trunk Sanitary Relief project. The project will provide wet weather storage capacity to reduce overflows.

How do you budget for inflow and infiltration? Not an easy question to answer because I&I is linked to so many other issues, including precipitation, flooding, customer connections, and age and condition of sewer lines.

Ultimately, utilities need to consider separating combined sewers, stemming the flow at the source, or expanding sewer and treatment systems to handle increased flows. However, each of those costs money, requires detailed planning, and can take years to...

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