drainage classification

drainage classification

A system of drainage classification devised by the Soil Conservation Service of the US Department of Agriculture. The most porous soil in this classification system is said to be excessively drained, in which water is removed from the soil very rapidly. In contrast, is the least porous soil, classified as very poorly drained, in which water is removed from the soil so slowly that the water table remains at or near the surface most of the time.
References in periodicals archive ?
Although somewhat subjective, Australian drainage classification uses these to estimate how quickly excess moisture is removed from the soil profile and landscape in conjunction with other considerations such as soil structure, porosity, water-holding capacity, water source, evapotranspiration, slope gradient and length (National Committee on Soil and Terrain 2009).