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If S is the length of the crest, H is the height of water source of a weir whose length is L and discharge is Q m3/sec, the velocity of approach Vd is
If S is the length of the crest, H is the height of water source of a weir whose length is L and discharge is Q m3/sec, the velocity of approach Vd is
Weir or notch. It is a physical structure of masonry constructed across the channel width to calculate the discharge of the channel section.