Civil Services
Elmhurst, Illinois

I-290 Storm Water Pump Station #34 Hydraulic Study
Illinois Department of Transportation

 

This study was undertaken to determine the adequacy of, and the needed improvements for, the storm water drainage system in the I-290 study section located in Elmhurst, Illinois, the Pump Station #34 wet well, and the pumps under 50-year and 100-year storm events. Storm runoff in the watershed of this I-290 section drains to three separate sewer systems, two of which drain to Pump Station #34.

A HEC-1 model was developed to create inflow hydrographs from 35 sub-basins and to locate runoff that was entering the storm sewer system from the drainage areas and adjacent bypass flow.

The hydrologic and hydraulic analysis indicated that the existing sewers and the wet well storage were not adequate for a 50-year storm event. Improvement alternatives included detention ponds and reservoirs, flow control structures, sewer replacement, and wet well additions. Donohue also conducted a cost-benefit analysis for each alternative.

 

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