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The notch – necessary to allow an outflow so as to avoid the erosion of the banks of the river-bed near the weir – is defined with reference to the following figure:




Geometrical diagram of the notch


LG [m]


Width of the notch lesser base


IS [°]


Inclination of the chutes on the side of the notch (Angle measured as positive clockwise)


FRS [m]


Safety freeboard to be guaranteed in the most unfavourable case, measured as the vertical distance between the notch bottom and the highest point of its chutes.





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