Soil Deep Drainage Potential

Deep drainage refers to the capacity of the deep subsoil and the material immediately below the soil profile to allow excess water to move downwards into deep sediments or fractured rock. Poorly structured or heavy clays are the most restrictive. Mapping shows the most limiting deep drainage potential class (provided this accounts for at least 30% of a map unit), while detailed proportion data are supplied for calculating respective areas of each deep drainage potential class (spatial data statistics).