PROBLEM TO BE SOLVED: To provide a regulator regulating a quantity of dropping water for a paddy field which is easily operated and in which a dropping water quantity control function works only when a large amount of rain falls.SOLUTION: In a regulator regulating a quantity of dropping water for a paddy field, a movable pipe 3 is vertically installed in an ascendable/descendable manner in a paddy field 2, an upper side exhaust port part 4 is arranged in an upper part of the movable pipe 3, water in the paddy field 2 is introduced from the upper side exhaust port part 4 and drained into a paddy field drain part 5 of the paddy filed 2 communicating with the movable pipe 3, and a water-level of the paddy field 2 is set by a height setting of the upper side exhaust port part 4. The movable pipe 3 includes an adjustment hole 6 adjusting a quantity of dropping water which communicates with the upper side exhaust port part 4 and of which opening area is smaller than that of the upper side exhaust port part 4. The movable pipe 3 ascends/descends so that the height of the upper side exhaust port part 4 is aligned with the setting water-level of the paddy field 2. A relative position relation between the adjustment hole 6 adjusting a quantity of dropping water in the movable pipe 3 and the upper side exhaust port part 4 is not varied by an ascending/descending operation, and therefore farmers operations to manage a paddy field water-level does not affect a dropping water quantity control function so that the dropping water quantity control function is stably provided.COPYRIGHT: (C)2014,JPO&INPIT【課題】操作が簡易で、多量の降雨時にのみ落水量調整機能が得られる水田用落水量調整装置を提供する。【解決手段】水田2に可動管3を昇降可能に立設し、この可動管3の上部に上部排水口部4を設け、この上部排水口部4から水田2の水が導入し可動管3に連通する水田2の水田排水部5へと排水し、上部排水口部4の高さ設定により水田2の水位を設定する水田用落水量調整装置において、可動管3内に、上部排水口部4に連通すると共に該上部排水口部4より開口面積が小さい落水量調整孔6を設け、可動管3を昇降し、水田2の設定水位に上部排水口部4の高さを合わせて使用する。そして、可動管3内の落水量調整孔6と上部排水口部4との相対的位置関係は、昇降操作によって変化しないため、農家の操作が落水量調整機能に影響を与えず、安定的な落水量調整機能が発揮される。【選択図】図4
