It is a watercourse created by man with the insertion of a construction (canal) in natural or artificial materials for the purpose of supplying, irrigation, drainage, diversion, flood discharge, hydroelectric energy production, navigation or other. It normally has a medium or weak slope. It is modeled through the orderly aggregation of "watercourse elements" that present characteristics of continuity, except in cases where the underground path cannot be reconstructed, and in a homogeneous direction. However, the presence of bends and branches is not envisaged secondary. The direction of travel of the constituent elements must agree with that of the current of the channel itself, which can therefore be determined on the basis of the altimetric trend of the terrain. For channels that allow a two-way flow, a single direction must in any case be assumed for the whole channel. The paths of the channels must be continuous and be organized in such a way as to connect at the derivation or delivery points in general with a natural hydrographic network or possibly with the pipelines, also acquiring:" the center line of the stretches of canal that are not visible (for example manhole covers)" the connecting lines with natural watercourses (virtual center line) in correspondence with the derivation or delivery situations
