Building Works includes buildings or structures or part thereof. Catchment is that area within which rainfall will contribute to runoff at a particular point. The area included in catchment is determined by topographic features which on many buildings sites can range from a few square metres to several thousand square metres. Clay are soil particles consisting of mineral particles less than 0.002 mm in diameter. Many of the properties of soil depend on the type and quantity of clay particles in the soil.
Cultivation is the mechanical preparation of the soil required for the growing of crops or pasture.
Dispersible Soil is structurally unstable. Highly dispersible soils are extremely erodable and are associated with high exchangeable sodium and low soluble salt concentrations. Artificial flocculation is required to help the settling process. Soil dispersability can be determined by laboratory tests. Earth Bank and Channel a bank is a ridge or embankment of compacted earth.