The sheet of water flowing over a notch or a weir is known as
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Explanation:
The sheet of water flowing over a notch or weir is called the nappe or vein. The nappe is the continuous flow of water that forms a smooth sheet as it falls over the edge of the weir or notch. This flow is typically observed in hydraulic structures and helps in controlling and measuring water flow.
Answer:
The sheet of water flowing over a notch or a weir is known as Nappe or Vein.