King believes that landscape evolution occurs only in arid or semi-arid climates and that landforms now existing in humid climates are relict. Slope aspect - the direction toward which the surface of the soil faces. Soils can be grouped according to drainage class, which is a way of indicating how wet the soil was during its formation. Redoximorphic features and mottling are indicative of wet and reducing conditions. Soil drainage class - an indication of the frequency and duration of soil wetness during pedogenesis.
Soils are usually sandy or gravelly with a very high saturated hydraulic conductivity.
Somewhat excessively drained Water is removed rapidly. Soils are usually sandy or gravelly with a high saturated hydraulic conductivity. Well drained Water is removed from the soil readily. Moderately well drained Soils are wet for a short time period within the rooting depth. Somewhat poorly drained A shallow to moderately deep water table occurs that restricts the growth of crops unless the soil is artificially drained.