Project Summary

The Sny Island Levee Drainage District is the largest levee and drainage district in the Upper Mississippi River Basin providing levee and drainage benefits to approximately 110,000 acres in Adams, Pike, and Calhoun Counties of Illinois. Due to the vast acreage protected by the District’s levees and the large watershed that empties into this area, the District has a great need for pumping. The District’s existing facilities include three independent pump stations that house a collective 2,400 CFS (~1,077,195 GPM) in pumping capacity. However, the existing pumps were designed in the early 1960s and since that time the hydraulic conditions at these pumping stations has changed dramatically. High-water conditions on the Mississippi River occur much more frequently than when the original design was developed, which creates a higher head condition for the pumps to operate against. This phenomenon diminishes both pumping efficiency and capacity as the existing pumps were designed to pump against a lower head condition. Therefore, the District has experienced extended periods of interior flooding and high fuel costs over the past several years.

Klingner was contracted in 2016 by the District to design supplemental pumping stations to be located adjacent to two of the existing stations. These supplemental stations would provide pumping capacity across a full range of anticipated head conditions, while also providing a much-needed increase in the overall pumping capacity of the District. Klingner performed a benefit to cost analysis to assist the District in selecting the total additional pumping capacity to be incorporated into the system. The District selected the addition of approximately 500,000 GPM through the installation of two supplemental stations at two different locations. These supplemental stations would utilize diesel engine driven pumps due to the remote location of each station. Additionally, the engines, right angle gears, and other pump appurtenances will be housed in elevated pump houses above the 500-year flood elevation.

Klingner’s design incorporated a multitude of services including geotechnical data collection and analysis, structural design, mechanical/electrical/plumbing design, bathymetric and topographical survey data collection, Section 408 permitting, site design, and hydraulics analysis. Klingner’s services also included intake channel design that was modified to accommodate physical modeling results that were contracted out by Klingner. The design and plan development utilized BIM software, which also assisted in both communication across the project team and with the client.