When architects, engineers and contractors need to retain a lot of ground economically, they use Square Foot™ Retaining Walls. Covering one square foot of wall face with each unit, this system is an affordable choice for large public works, institutional, residential and commercial projects, waterways and retention ponds. The units are engineered to provide construction flexibility, Versa-lok providing the option of building with the traditional one-inch setback, or near vertical to accommodate your needs.