the vertex attitude is the high-altitude section of a channel.
Since by the air-lock use and leakages in the air-locks the water of the channel from the vertex attitude flows into the more deeply lying attitudes, a channel a Wasserzufuhr within the range that must Vertex attitude exhibit. With modern channels like the Main Danube channel the supply of the vertex attitude takes place via pumping plants and storage reservoirs.
With older canal constructions water of the environment was supplied to the channel through guidance ditches so mentioned. This particularly proved with channels in water-poor areasand with comparatively highly convenient vertex attitude (Ludwig channel, Rhine Marne channel) as problematic and it led occasionally to the fact that these channels in dry summers could not be used or only reduced.
A large area collection lies, only in the range of the vertex attitudewith disproportionate expenditure with a cut to be crossed or with the help of additional air-locks exceeded, is the plant of a canal tunnel, which forms a vertex tunnel then at the same time , would know often an appropriate solution.