Flood Mystery Suggestion.
Posted By Cliff Tuttle | August 21, 2011
No. 690
The flash flood on Washington Boulevard in Pittsburgh and the death of four people made the national news all weekend. There was high water on many other streets in the City of Pittsburgh, although not with the deadly effect that the canyon that contains Washington Boulevard had.
Officials from the City and ALCOSAN were quoted as saying that the exact cause of the inability of the storm water sewers to handle the storm waters was a mystery, since the pipes were free of blockage.
While I do not have personal knowledge of the situation on Washington Boulevard, I have been aware that flooding has been caused in the past in the City by the failure of road crews to clear away piles of leaves and debris that accumulate near storm inlets as a result of earlier rainstorms. These debris piles create diversions of storm water onto roads and into basements. Of course, in a storm as fierce as the one last Friday, the dams could have been swept away, but not until after diverting a great quantity of water onto the road.
CLT