The O'Hare System of the Tunnel and Reservoir Plan (TARP), which services 11.2 square miles of combined sewers, 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. Overflow, sewer back-up, manhole cover blow-off, and geysering problems were analyzed using a mathematical modeling approach. An overall mixed transient flow model was used to simulate the tunnel fill-up process and the generation of surges. A separate local model was used to analyze the possibility of the blow-off and geysering problems. The mathematical models were also used to determine engineering solution alternatives to the surge problems.
|Original language||English (US)|
|Title of host publication||Project Report - University of Minnesota, St. Anthony Falls Hydraulic Laboratory|
|State||Published - Sep 1 1988|
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