The present invention relates to automatically adjust the amount of water supplied to the paddy fields, manufactured at low cost, and can be installed, and automatically stop possible paddy for supply water stop square the water supply of agricultural water without requiring a special drive source provide. The apparatus includes a water inflow chamber 2 agricultural water from the external flows, is partitioned into a water supply chamber 3 is running water from the water inflow chamber 2 adjacent to the water flow entering 2 flows through the bottom of the square and the partition wall 4, a water supply port 31 which is open to the paddy 9 side top of the water supply chamber 3, Yue is provided with a water inflow chamber 2 waterways 7 side weir plate 23 for a height adjustable water level adjustment to the top running water It provided with the discharge port 21. .BACKGROUND 2【課題】水田への給水量を自動で調整し、低コストで製作、及び設置可能、かつ特別な駆動源を要することなく農業用水の給水を自動的に停止可能な水田用給止水枡を提供する。【解決手段】外部からの農業用水が流入する用水流入室2と、該用水流入室2に隣接して用水流入室2からの流水が枡の底部を通って流入する用水供給室3とに区画する隔壁4と、用水供給室3の水田9側上部に開口する用水給水口31と、用水流入室2の水路7側上部に高さ調節可能な水位調整用の堰板23を設けた越流水排出口21を備える。【選択図】図2
