The O'Hare System of the Tunnel and Reservoir Plan (TARP), which
services 11.2 square miles of combined sewers, as shown in Fig. 1, is the
smallest of the four systems comprising the 352-square mile combined sewer
service area operated by the Metropolitan Sanitary District of Greater
Chicago (MSDGC). After completion of this system in 1980, the O'Hare
System area has still experienced problems, including basement flooding from
sewer back-up and foundation seepage, overbank flooding, transportation
delays caused by flooded streets, water quality degradation of area
watercourses from combined sewer overflow, and public health hazards
resulting from sewer back-ups. The average annual damage due to flooding
in the O'Hare System are estimated to be in excess of $2.5 million
U.S. Army Corps of Engineers
Contract No. DACW25-88-M-4080
Guo, Qizhong; Song, Charles C. S..
Hydraulic Transient Analysis of Tarp Phase II System.
St. Anthony Falls Hydraulic Laboratory.
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