PROBLEM TO BE SOLVED: To provide a water level adjustment device which is installed at an exhaust port of a paddy field to adjust water level.SOLUTION: Guide grooves 6, 6 extending vertically are provided on inner side surfaces of both side plate portions 3, 3 of a drainage box, a lower plate 8 and a water level adjustment plate 9 are attached to the guide grooves, the lower end of the lower plate contacts a bottom plate portion 2 of the drainage box, the water level adjustment plate is fixed to a predetermined height from the bottom plate part, and the water level adjustment plate in which a triangular opening 15 is formed is provided with a closing plate which can close the opening as necessary.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】水田の排水口に設置して水位を調整する為の水位調整装置の提供。【解決手段】排水枡の両側版部3,3の内側面には上下方向に延びるガイド溝6,6を設け、このガイド溝に下部板8と水位調整板9を取付け、下部板の下端は排水枡の底版部2に接し、水位調整板は底版部から所定の高さに固定し、そして水位調整板には三角形の開口15を形成すると共に開口を必要に応じて塞ぐことが出来る閉塞板を取付けている。【選択図】図2
