Star Tribune Sun, 17 Feb 2008 13:53:43 GMT
A threat builds deep beneath the Twin Cities
Parts of the metro area's vast and aging storm water tunnel network are bursting apart and creating a risk of flooding. ... In many places, excessive water pressure has cracked or burst tunnel walls, undermining them, Krumm and other engineers said. If such a tunnel collapsed, the falling debris could block it, backing up storm water and flooding the neighborhood that the tunnel is supposed to protect, engineers said. The city of St. Paul and the Minnesota Department of Transportation, which own 28 miles of storm water tunnels, face similar problems. Pressure is so high in a tunnel beneath Interstate 35W in south Minneapolis that a geyser erupts from a manhole in the median during some storms. In other places, manhole covers are blown into the sky during heavy storms.
[[keywords: PublicWorks;Metro;]]
No comments:
Post a Comment