A nappe, in geology, is a large sheetlike body of rock that has been moved far from its original position. The term stems from the French word for tablecloth. Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason)) is the science and study of the Earth, its composition, structure, physical properties, history, and the processes that shape it. ... Rock may refer to: Rock, a geologic substance composed of minerals Rock, the super-genre of the styles of music evolved from Rock and roll Rock, a small offshore islet with minimal soil Rock, a confectionery made and sold in many of the UKs seaside holiday resorts Rock candy... A table cloth is a cloth used to cover a table to protect it from being stained or scratched. ...
The ventilated air pocket formed under the nappe insuresthat atmospheric pressure is present to all sides of the nappe.
With atmospheric pressure on all sides the nappe is properly shaped for maximum accuracy.
The pool formed upstream of a weir plate is not self scouring, to easily flush any sediment that may accumulate upstream of the weir an optional flushing port at the bottom of the weir plate is available.
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