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 (from the Greek á¼±ÎµÏÎ±ÏÏÎ¯Î± hierarchia, rule of a high priest, from á¼±ÎµÏÎ¬ÏÏÎ·Ï hierarkhes, leader of sacred rites) is an arrangement of items (objects, names, values, categories, etc.) in which the items are represented as being above, below, or at the same level as one another. subsumptive containment hierarchy is a classification of objects from the general to the specific. Other names for this type of hierarchy are taxonomic hierarchy and  IS-A hierarchy. The last term describes the relationship between each levelâa lower-level object is a member of the higher class.