Shelbina Missouri Wastewater System Improvements

Challenge:

In Shelbina, Missouri, the population was declining, wastewater infrastructure was aging and new permits required the city to address inflow and infiltration issues (I/I) and eliminate its secondary outfall.

Areas of expertise:
Water Engineering | Wastewater Solutions

Solution:

SKW presented Shelbina officials with a plan on how to budget, prioritize and methodically repair defects to the collection system and reduce I/I. This priority ranking took into account the area’s impact on the wastewater treatment plant flows and the costs of rehabilitation.

SKW developed one of the first No Feasible Alternatives Analyses in the state of Missouri. Because the No Feasible Alternatives Analysis showed that eliminating the secondary outfall was not possible within the limits of Shelbina’s Voluntary Compliance Agreement (VCA) with the Missouri Department of Natural Resources, SKW worked with the city to develop a Wet Weather Operations Plan and a Capacity, Management, Operations and Maintenance (CMOM) Program.

Outcome:

Three years into the recommended collection system repairs, Shelbina has started to see reductions in the amount of I/I entering its treatment facility.

By leveraging a newly allowed process of blending, the city has the opportunity to effectively eliminate the secondary outfall, as was required by the VCA, in an economically and environmentally feasible way.