PROBLEM TO BE SOLVED: To provide a rice paddy water level adjustment device which has a simple structure in a mechanical construction, which can detect slight water level variation of flooding, which can feed water and stop water feeding as quickly as possible to a rice paddy in linkage with detected water level variation, and automatically maintain and manage a proper water level which is proper for the growth of flooding crop plants.SOLUTION: A lid body whose opening is energized is provided on an opening part of a water way pipe, to the lid body a tip end of a wire for opening/closing operations is connected, a base end part of the wire is connected to a float resin plate which floats on a rice paddy through a linkage connection tool, and the linkage connection tool is formed of: a guide pipe which is erected and fixed on an almost center part of the float resin plate an anchor bolt which is erected and fixed to a lower farm field of the float resin plate and loosely fitted to inside of the guide pipe from a lower side and a wire fixing tool which is provided on the guide pipe for tension and relaxing of the wire base end according to float-and-sink of the float resin plate.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2019,JPO&INPIT【課題】機械構造的にシンプルでありながら、湛水の僅かな水位変動を検出することができ、検出した水位変動に連動して可及的速やかに水田へ給水・止水をすることができ、湛水作物の生育に適切な適正水位を自動的に維持管理可能とする水田水位調節装置を提供する。【解決手段】水路パイプの開口部に開口付勢した蓋体を設け、蓋体には開閉操作用のワイヤ先端を連結し、該ワイヤ基端は水田に浮遊するフロート樹脂板に連動連結具を介して連結すると共に、連動連結具は、フロート樹脂板の略中央部に立設固定したガイドパイプと、フロート樹脂板の下方圃場に立設固定しガイドパイプ内部に下方から遊嵌したアンカ―ボルトと、ワイヤ基端をフロート樹脂板の浮沈に応じて緊張弛緩するためにガイドパイプに付設したワイヤ固定具と、より構成してなることとした。【選択図】図1
