noun
sheeting board; stop plank; dam board
A board used to form a temporary barrier in water channels, weirs, or construction; often part of a set of planks inserted into grooves to control water flow.
用水路に堰板を入れて水位を調節する。
They insert stop planks into the irrigation channel to adjust the water level.
工事現場で堰板を組み立てて水をせき止めた。
At the construction site, they assembled sheeting boards to hold back the water.
堰 (せき) is a general term for a dam or weir, while 堰板 specifically refers to the individual boards or planks used to construct or adjust such a barrier.
Compound of 堰 (せき, 'dam, weir') and 板 (いた, 'board, plank'). The reading せきいた is a straightforward combination of the two elements.