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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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