Project Details

The project converted underutilized portions of a multi-tenant retail parcel parking lot into usable retail and restaurant space. The site is adjacent to a brook and is within the 100-year floodplain of it.

Challenge

The development would encroach on the floodplain, and the parcel did not have any available land adjacent to the stream to create an area of compensatory floodplain storage.

Solution

StormTrap, a subsurface precast system, was placed outside of the area that contained the floodplain and hydraulically connected to the stream by the existing subsurface closed drainage system.

“The high void ratios of the StormTrap units allows for a large amount of floodplain storage to be achieved with a relatively small footprint and flexibility to design around various ground penetrations (i.e., light poles, dumpster pads, catch basins) that are needed for the development of the site itself,” explained Jessica Bates, P.E., Senior Civil Engineer with BL Companies.