< Topic >The water level adjustment which efficiently adjusts water level simply is offered.SolutionsThe occasion where it supplies water to field 7, the operational plug operates due to opening and closing the valve 28 of the water level adjustment, can adjust in 2 phases of the water level which is the water level or flood stage which is low water flow rank of field 7. In addition, the occasion where you adjust the water level of field 7 in flood stage, as for obstructing the waterway, because of being only operational feature of water level adjustment tube 20, it is possible efficiently, to let flow the water which passes by underdrainage tube 50 to flood stage tube 40. Furthermore, the occasion where you adjust the water in flood stage, because it does not need and if it should have executed only the process which closes valve 28, to do the water level adjustment simply it is possible new configuration.< Choice figure >Drawing 2【課題】簡便に効率的に水位を調節する水位調節装置を提供する。【解決手段】圃場7に給水する際、水位調節装置のバルブ28の開閉により、可動栓が動作し、圃場7の低水位である水位または、高水位である水位の2段階に調節することができる。また、圃場7の水位を高水位に調節する際、水路を妨げるのは、水位調節管20の可動機構のみのため、暗渠排水管50を通る水を効率的に、高水位管40へと流すことができる。さらに、水を高水位に調節する際、新たな設定を必要とせず、バルブ28を閉める工程のみを実施すればよいので、簡便に水位調節を行うことができる。【選択図】図2
