Is a retaining wall considered a permanent structure?

A retaining wall is a structure that holds or retains soil behind it. There are many types of materials that can be used to create retaining walls like concrete blocks, poured concrete, treated timbers, rocks or boulders. Some are easy to use, others have a shorter life span, but all can retain soil.

All this is further explained here. Simply so, what is a retaining structure?

Retaining Structures. Retaining structures are engineered to retain soil and/or rock. They are commonly used to accommodate changes in grade, provide increases in right-of-way and buttress the toe of slopes.

Likewise, what type of retaining wall is best? Retaining Wall Materials Comparison Chart

TYPE OF MATERIAL PROS
Poured Concrete Stronger than a block wall Variety of design options
Brick Strong and durable
Wood Accessible materials Fairly simple installation
Dry Stone/Boulder The most natural solution to grade change

Just so, what is considered a retaining wall?

A retaining wall is a strong structure that is made to keep a hill, slope or mound of earth in place. Retaining walls can be of any height but are usually higher than 3 feet. Garden walls. Garden walls are low walls, usually about 18-24 inches in height, that line a landscape feature.

What slope requires a retaining wall?

You can slope soil at a maximum of about 35 degrees, if it is mostly granular soil. Any steeper and you need a retaining wall of some sort to keep the soil in place.