In hydraulic engineering, a nappe is a sheet or curtain of water that flows over a weir or dam. In hydraulic engineering, a jet is a sheet of water that flows from the orifice.

Bryan Stanley
Design Engineering
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In hydraulic engineering, a nappe is a sheet or curtain of water that flows over a weir or dam. In hydraulic engineering, a jet is a sheet of water that flows from the orifice.
The sheet of water flow that flows over weir or dam is known as nappe. The sheet of water that flows from the orifice is known as jet.