Hydraulic Studies and Upgrades » Donohue & Associates, Inc. Various Stormwater Pump Stations Client: Illinois Department of Transportation Location: Schaumburg, Illinois Donohue designed improvements for IDOT’s Pump Station No. 27, the existing main drains, and an outlet channel for drainage from tributary areas of I-94, I-57, and the Stony Island Extension in the southern section of Chicago. The project consisted of conducting field surveys for stream cross- sections, hydraulic structures, roadway profiles, and expressway sewer systems; watershed and sub- basin delineation; and determination of critical storm durations and runoff hydrographs from each sub- basin to main drains under I-94, I-57, and the Stony Island Extension. Pump Station No. 27 (345 mgd capacity), with its extensive and

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