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2. Retaining wall - Wikipedia

   en.wikipedia.org/wiki/Retaining_wall

   Dry-stacked gravity walls are somewhat flexible and do not require a rigid footing. They can be built to a low height without additional materials being inserted, and have concrete added for strength and stability. [8] Earlier in the 20th century, taller retaining walls were often gravity walls made from large masses of concrete or stone.

3. Setback (land use) - Wikipedia

   en.wikipedia.org/wiki/Setback_(land_use)

   British Columbia uses a minimum setback of 4.5 metres (15 feet) of any building, mobile home, retaining wall, or other structure from all highway rights-of-way under the jurisdiction of the Ministry of Transportation and Infrastructure unless the building has access from another street, in which case the allowed setback is 3 metres (10 feet).

4. Batter (walls) - Wikipedia

   en.wikipedia.org/wiki/Batter_(walls)

   The batter angle is typically described as a ratio of the offset and height or a degree angle that is dependent on the building materials and application. For example, typical dry-stone construction of retaining walls utilizes a 1:6 ratio, that is for every 1 inch that the wall steps back, it increases 6 inches in height. [5]

5. Height restriction laws - Wikipedia

   en.wikipedia.org/wiki/Height_restriction_laws

   In the central area of Rome, delimited by the Aurelian Walls, no building can exceed the height of the dome of St. Peter's Basilica (136 m (446 ft)). A skyscraper called Torre Eurosky (Eurosky Tower), built in 2012 in EUR neighbourhood (outside the ban area) exceeds this limit being 155 m (509 ft) high.

6. Dry stone - Wikipedia

   en.wikipedia.org/wiki/Dry_stone

   The weight of the stones resists the pressure from the retained soil, including any surcharges, and the friction between the stones causes most of them to act as if they were a monolithic gravity wall of the same weight. Dry stone retaining walls were once built in great numbers for agricultural terracing and also to carry paths, roads and ...

7. Mechanically stabilized earth - Wikipedia

   en.wikipedia.org/wiki/Mechanically_stabilized_earth

   The walls are infilled with granular soil, with or without reinforcement, while retaining the backfill soil. Reinforced walls utilize horizontal layers typically of geogrids. The reinforced soil mass, along with the facing, forms the wall. In many types of MSE’s, each vertical fascia row is inset, thereby providing individual cells that can ...