RECOMMENDED LESSONS: Runoff Runoff is precipitation that did not get (infiltrated) absorbed into the soil, or did not evaporate, and therefore made its way from the ground surface into places that water collect. Runoff causes erosion, and also carry chemicals and substances on the ground surface along to the rivers where the water ends up.
Noun. 1. obelisk-a stone pillar having a rectangular cross section tapering towards a pyramidal top. pillar, column-a vertical cylindrical structure standing alone and not supporting anything (such as a monument).
Pilaster columns are a type of column, but are a combination of the obelisk and the column monument. The pilaster column has a square or rectangular shaft and is either flat topped or topped with an urn. The term pilaster can also be used to describe a support column protruding from a wall.