In addition, the park’s signature feature known as the “Great Lawn,” was restored to its original conditions, with no protrusions from the basin below. As a result, the design team preserved mature trees in the area and maintained access to the park during and after construction. The client and the community wanted to preserve the park for future use.

It also is the home to one of MSD’s existing flood protection pump stations. The 100-year-old park site was selected because of its proximity to the Ohio River and two large combined sewer outfalls. In addition to the short timeframe for design, the Southwestern Parkway CSO Basin was built in the middle of the historic Shawnee Park. After the basin empties, a series of automatic wash down processes that includes flushing gates and tipping buckets are used to clean the basin. A pumping system sends the combined overflow to the closest Wastewater Treatment Plant once the storm ends. The basin can be filled to various levels depending on the size of the storm event, then emptied once the storm is over.

Conveyance piping and other related facilities.ī&N designed new diversion structures in and around existing sewer lines to direct the combined storm water and sewage overflow to the basin instead of discharging into the Ohio River during large storms.

A new 30-million-gallon-per-day pump station.

The Southwestern Parkway Combined Sewer Overflow (CSO) Basin, also known as the Shawnee Park CSO Basin, is an underground, concrete storage facility that includes:

In a design/build partnership with Ulliman Schutte Construction, B&N completed the preliminary and final designs in less than one year to help the Louisville and Jefferson County Metropolitan Sewer District (MSD) meet an EPA consent decree and improve water quality in the Ohio River. The basin is expected to reduce the number of overflows per year from approximately 70 down to no more than eight under the design conditions. In Louisville, Kentucky, combined sewer overflow events near the historic Shawnee Park have been dramatically reduced with the completion of a new $78 million, 20-million-gallon underground storage basin.

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