In 2003, Forster and Solomon (Observations of a weekend effect in diurnal temperature range, PNAS, [ http://www.pnas.org/content/100/20/11225.full ]) reported: we find evidence of a weekly cycle in diurnal temperature range (DTR) for many stations in the United States, Mexico, Japan, and China.
The total cost to have a concrete retaining wall installed will be a combination of material and labor prices. For a basic wall you can expect to pay between $30 and $40 per square foot.
The average minimum cost per square foot of concrete slab is $1.36. The average maximum cost per square foot of concrete slab is $1.88. In addition to the concrete used to form the slab, homeowners will face some additional costs associated with this type of residential project.