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I'm stuck on 22ac Sheet of water flowing over a weir or dam (5)
I've got N?P?E so it looks like NAPPE but this is defined as movement of rock in all the dictionaries I've tried. Any thoughts, anybody?

Chambers has Nappe, 'a sheet of water flowing over a weir...' - it's the third or fourth definition.

nappe is correct.

Thank you both. I looked at Chambers online but didn't dig deep enough.
Cheers,
Andy