Lined Manhole Remains Intact on Collapsed Sewer Line in Chicago

摘要

The problem with spending $60 million on manhole rehabilitation is that it's hard for the public to appreciate all their utilities buried underground where they function perfectly... and rarely gets noticed. But "rarely" isn't the same as "never." In late July 2010, unusually heavy rainfall in Chicago dumped 7 in. in just a few hours. On Aug. 4,2010, the already overburdened sewer system (which runs sanitary waste and stormwater through the same pipes) suffered a serious shock when yet another unseasonable storm event hit the city.This time, infiltration and erosion undermined a major sewer line, and its subsequent failure led to a dramatic collapse of a section of sewer line on Marquette Avenue in Chicago's busy downtown. Portions of the street dropped 2 ft.