Infiltration capacity, in soil science, is the measure of a soil's permeability and ability to admit water. This is significant in the fields of ecology, geology, and particularly hydrology, in the maintenance of watersheds, and in the prediction of flooding and soil erosion. Soil science deals with soil as a natural resource on the surface of the earth including soil formation, classification and mapping; physical, chemical, biological, and fertility properties of soils per se; and these properties in relation to the use and management of soils. ... Water (from the Old English word wæter; c. ... (Ecology is sometimes used incorrectly as a synonym for the natural environment. ... Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason)) is the science and study of the Earth, its composition, structure, physical properties, history, and the processes that shape it. ... Water covers 70% of the Earths surface. ... A watershed or catchment basin is the region of land whose water drains into a specified body of water, such as a river, lake, sea, or ocean. ... Look up Flood on Wiktionary, the free dictionary A flood (in Old English flod, a word common to Teutonic languages; compare German Flut, Dutch vloed from the same root as is seen in flow, float) is an overflow of water, an expanse of water submerging land, a deluge. ... Severe soil erosion in a wheat field near Washington State University, USA. Erosion is the displacement of solids (soil, mud, rock, and so forth) by the agents of wind, water, ice, or movement in response to gravity. ...