Notch¶

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:

Gaveta

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.