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Medical Plaza Way

Clarksville, Indiana


Kentuckiana Medical Center LLC


Jacobi, Toombs and Lanz, Inc.


Excel Excavating Inc.


November 2008

Technical Description:

  • 690 ChamberMaxx Retention Chambers
  • ChamberMaxx Containment Row, Manifold Tees and Elbows
  • 7,200 SY of C-40 Non-Woven Geotextiles

Located off U.S. 31 at Veterans Parkway in Clarksville, IN, the $42.8 million Kentuckiana Medical Center LLC site development project will include a 75,000-squarefoot physician-owned hospital building as well as a 40,000-square-foot medical office building. The hospital will initially house about 40 beds, and provide services such as emergency care, imaging, cardiac care, internal medicine and plastic surgery.

Parking for the new facility will be provided by the Medical Plaza Way lot. As paved surfaces increase stormwater runoff, developers were required to implement a stormwater management solution that would meet the regulations and guidelines set by the US Environmental Protection Agency (US EPA) and the state of Indiana Department of Environmental Management (IDEM). The town of Clarksville – like many Indiana communities – has implemented a stormwater quality program, taking extra care to control the amount of contamination entering local waterways by stormwater runoff.

When developing the parking lot, the site engineer, Jacobi, Toombs and Lanz Inc., and the contractor, Excel Excavating Inc., looked for an effective stormwater retention solution that would meet the requirements and also fit the site’s constraints.

A traditional aboveground retention pond was not economical due to the tight site. Available land is at a premium, and they wanted to maximize the site as much as possible. Installation of a pond would have limited the amount of parking, decreased the buildable area, and would have also increased maintenance costs in the long run for the site’s owners. Large diameter corrugated metal pipe (CMP) and corrugated HDPE plastic pipe were also considered as possible solutions, however the site had a very shallow profile, leaving limited vertical space to work with. They finally decided that a plastic chamber system would work best.

“Chambers were selected for the project because they were the lowest cost solution available in the market,” said Patrick Howser of Excel Excavating Inc. Chambers also offer a short height profile which optimizes stormwater storage on shallow sites such as the Medical Plaza Way lot.

Ultimately, the ChamberMaxx retention system from Contech Engineered Solutions LLC and distributed by CPI Supply was selected. Compared to the original chamber system that was specified, the ChamberMaxx system was more efficient because it offers 49 cubic feet of storage per chamber. For this site, the ChamberMaxx was able to provide the required retention volume using 690 chambers versus the 707 chambers of the originally specified chamber. By choosing ChamberMaxx, they were able to use a fewer number of overall chambers.

The chambers are injection molded using structurally-efficient and corrosive-resistant polypropylene resin. The lightweight chambers allow for placement without the use of heavy equipment.

“One reason why ChamberMaxx is cost effective is because the chambers can be set by hand with lower labor costs, eliminating the need and expense of a crane,” Howser said.

The ChamberMaxx system features integral end walls that are attached prior to installation. This provides superior structural integrity and fewer parts to handle during installation. Also, the engineers at Contech incorporated a new design with this installation where they reshaped the chamber layout in order to hold over 62,000 cf. This enabled a much quicker installation and overall cost savings.

“Installation of the chambers was quick and went very smoothly. It only took 9 hours to set and assemble all of the ChamberMaxx components,” said Howser. “The entire installation was completed in 1.5 weeks which included hauling all of the excavated material off site.”

There are also five Contech Aluminized Steel 60-in. perforated detention systems installed across Veteran’s Parkway from the medical center. They were installed a year earlier at the Jeffersonville Town Center where depth was not an issue.

Medical Plaza Way and the Kentuckiana Medical Center are due to open later this year.

Technical Description:

  • 690 ChamberMaxx Retention Chambers
  • ChamberMaxx Containment Row, Manifold Tees and Elbows
  • 7,200 SY of C-40 Non-Woven Geotextiles

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