2006 Segmental Concrete Walls

Segmental Block Retaining Wall
Grand Forks Permanent Flood Protection Project

Owner: US Army Corps of Engineers City of Grand Forks	Entered by: Aggregate Industries
Builder: Opp Construction	Engineer: Stanley Consultants, Inc.
Project Manager: US Army Corps of Engineers	Contractor: Gowan Construction, Inc.

Using the flexibility and economy of segmental concrete wall components, the engineers for the Flood Protection Project could accomplish multiple goals for this portion of the permanent flood wall. Of primary importance was the construction of an effective structural system to keep out floodwaters. A secondary benefit was the preservation of valuable parking spaces in the downtown commercial district through the reduction in levee footprint by about one-half. The wall was constructed using Keystone Compac Units. The Keystone system offers enough strength and stability for walls up to 50 feet in height. The durable wall was constructed using inch high and 18 inch wide blocks made of high performance concrete providing high strength and low permeability. The interlocking blocks combine with a geogrid support system in the retaining soil mass to provide stability and alignment. This Award Winning wall system provides aesthetic appeal, cost efficiency, ease of installation, durability, and high strength, all important qualities of a sustainable design for the flood protection effort for the City of Grand Forks.