In areas supporting a portion of a roadbed, retaining wall, or embankment, place backfill in uniform layers at most 8 in. deep (loose. measurement). Compact each layer to meet the density requirements of the roadbed, retaining. wall, embankment material, or as shown on the plans.
A hierarchy (in Greek: often used in Geographic studies á¼±ÎµÏÎ±ÏÏÎ¯Î±, it is derived from á¼±ÎµÏÏÏ -hieros, sacred, and á¼ÏÏÏ -arkho, rule) is a system of ranking and organizing things or people, where each element of the system (except for the top element) is subordinate to a single other element.ost evolutionary biologists assert a hierarchy extending from the level of the specimen (an individual living organism -- say, a single newt), to the species of which it is a member (perhaps the Eastern Newt), outward to further successive levels of genus, family, order, class, phylum, and kingdom.
A hierarchy is an organizational structure in which items are ranked according to levels of importance. Most governments, corporations and organized religions are hierarchical. A hierarchy is an organizational structure in which items are ranked according to levels of importance. Most governments, corporations and organized religions are hierarchical. In a computing context, there are various types of hierarchical systems. Most file systems, for example, are based on a hierarchical model in which files are placed somewhere in a hierarchical tree model. A file is placed in a directory (folder in Windows) or subdirectory at the desired place in the tree structure.