Nappe (water)

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The term Nappe when used in relation to hydro-engineering refers to the sheet of water over-topping a dam. It is an important issue in dam construction because unless air can be introduced into the nappe, the vibration of the water can lead to dam failure.[citation needed]

Nappe vibration can be managed by flow splitters in the dam wall design.

Nappe- The underside of which is not in contact with the overflow of structure and is at ambient atmospheric pressure.

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