DBGT10K — Natural watercourse

It represents a constant and/or torrential natural water course (steam) that collects the waters of a water catchment area and flows into another watercourse, into a body of water or into the sea. “Natural water course” means a body of surface water with running water, which has settled naturally. The path of each instance of this class is obtained by aggregating in an orderly manner, according to the direction of water flow, and therefore according to the survey of the slope of the soil, water elements (which define the path). It is also characterised by all the ‘wet areas’ that have been detected at the return stage and by all the ‘Alvei’ recognised among the natural forms of the soil as the bed areas of the river shaft. All natural watercourses constitute a topologically linked network, except for cases of swallowing facilities that result in the occurrence of non-rebuildable underground routes and the case of spaglio, or the dispersion of water in the soil (usually obtained by hydraulic works modifying the natural path of the watercourse); thus the path of a natural watercourse constitutes a partition of the natural hydrographic grid.