Remember, an heavy storm events on Minnesota's I-35 West in Minneapolis have caused flooding so intense within the existing stormwater tunnels that, in addition to road closures, manhole lids have blown off into onto the interstate.
The original, 50-year old tunnel system was designed to carry stormwater runoff from the highway and the surrounding neighborhoods. As development within the 3,100-acre surface (12,5 kilometers square meter) drainage area has continued, the volume of water for the storage tunnels to handle has increased.
As part of a great team effort to mitigate flooding incidents, the Minnesota Department of Transportation contracted the Brierley Associates, Barr Engineering and TKDA Team to design a new, underground stormwater storage facility solution featuring six interlocking diaphragm walls. The Kraemer/Nicholson Joint Venture would then take over the construction phase of the project through the CMGC Project Delivery Process, which includes multiple techniques along a busy, three-lane interstate with some challenging ground conditions.