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.
Costs typically start at $6 per square foot for a basic patio and range up to $15 or more per sq. ft. for a complex design. To break it down, the cost to build a concrete patio depends on the following needs and requests: 1  size and thickness (4 thick is the norm) 2  desired shape.  amount of reinforcement.