[PROBLEMS] To provide a water level adjusting tank for a water storage area that can efficiently adjust a water level necessary for a water storage area such as a paddy field, has excellent drainage efficiency, and can withstand a considerable water pressure load. A water level adjusting rod 1 for a water storage area according to the present invention is constituted by a substantially cylindrical frame 2 in which an upper portion is opened and a lower portion is closed by a bottom surface 11 and a side wall 10 forms a curved surface. Is provided with a water level adjusting plate 30 that can be adjusted in height to partition the water intake chamber 2a and the drainage chamber 2b, and the side wall 10 of the frame 2 on the side of the water intake chamber 2a is used to take in water from the water storage area. A water intake 12 is provided so as to be freely opened and closed by a weir plate 20 having an opening 22, and drainage for draining the stored water flowing into the frame 2 on the side wall 10 or the bottom surface 11 on the drainage chamber 2 b side of the frame 2. The mouth 14 is provided. [Selection] Figure 1【課題】水田などの貯水域に必要な水位を効率よく調整でき、優れた排水効率を有するとともに、かなりの水圧負荷にも耐え得る貯水域用水位調整枡を提供する。【解決手段】本考案の貯水域用水位調整枡１は、上方が開口し下方が底面１１により閉口して側壁１０が曲面を為す全体が略円筒状の枠体２で構成され、枠体２の内部には、取水室２ａと排水室２ｂとを仕切る高さ調整可能な水位調整板３０が設けられ、枠体２の取水室２ａ側の側壁１０には、貯水域から貯水を取り入れるための取水口１２が開口部２２を有する堰板２０によって開閉自在に設けられ、枠体２の排水室２ｂ側の側壁１０若しくは底面１１には、枠体２内に流入した貯水を排水するための排水口１４が設けられている構成となっている。【選択図】図１
