Date
Monday, July 20, 2026
Time
10:30 AM - 11:00 AM
Location Name
Room 5, Level 2
Name
Floatin’ ‘n Pumpin’ – CMAR Solutions for the Pigeon Forge Intake
Track
Water Supply
Description
The City of Pigeon Forge hired LDA Engineering for the design of a new raw water intake pump station at Douglas Lake and new transmission water main to increase capacity to meet the growing demands of Pigeon Forge and surrounding municipalities. Raw water is supplied to the City of Pigeon Forge primarily by the existing intake and pumping facilities located on Douglas Lake. The existing facilities consist of two pump stations, namely the intake pump station and the transfer pump station, that pump a maximum of 7 MGD to the plant through a 24-inch DIP transmission main that was installed in the early 2000’s. The existing conveyance system is generally limited to approximately 7 MGD with the installed pumps, although the intake is permitted for 10 MGD. The intake is located on TVA property within an existing TVA easement. The City of Pigeon Forge has experienced operational issues with the intake pump station in recent years. The submersible turbine pumps at the intake pump station are oriented on a 22.5-degree angle. Given this orientation and the valve structure layout, removing and maintaining the existing pumps is a very tedious and difficult process. In addition, the City has experienced multiple pump failures in recent years including pumps needing to be replaced within three years. The issues that have been experienced have required significant financial and man-power investment to keep the system operational. In order to deliver the complex project while meeting funding timeline requirements, LDA Engineering identified that a new intake would need to be constructed in the same location as the existing. This approach would require temporary pumping measures while the existing intake is being replaced. In order to address this highly complex and difficult issue, the project was identified to be delivered through the Construction Manager at Risk (CMAR) delivery process. Garney was selected as the CMAR. While acting as the CMAR, Garney evaluated several possible options for temporary bypassing. Garney, LDA Engineering and Pigeon Forge worked together to determine that a temporary floating pump station located within the existing TVA easement would be the best solution. The temporary floating pump station was designed to supply a needed 7.2 MGD while the existing pump station is out of operation. Garney, as a delegated design, designed the floating pump station with 100% redundancy. Without the use of the CMAR process, the optimal solution would not have been able to be identified and incorporated into the project as quickly when compared to other delivery methods. In addition, the CMAR process allowed the CMAR, Engineer, and Owner to work collaboratively to identify and deliver a solution that ensures the Pigeon Forge has adequate water during this important project.