Non-return valve
A non-return valve (check valve or flap valve) is: ‘A one-way valve that normally allows fluid to flow through it in only one direction. In watercourses it is usually a top-hinged gate designed to close when downstream water level exceeds the upstream water level. Frequently used for drainage outfalls into tidal waters and rivers to prevent backflow.’
Ref Culvert, screen and outfall manual, (CIRIA C786) published by CIRIA in 2019.
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