To prevent clogging in pipes (tubes) leading water, even if turbulence occurs due to increased flow velocity due to heavy rain etc., it is possible to reliably stop water and, even if installed in different places, Provide irrigation water stopcock which can be adjusted to water level.SOLUTION: The irrigation water stopcock 100 is set up to stand between a paddy field and a canal canal. When the rice field water is low in water level h1, if the inner tube 2 is pulled out from the outer tube 1 and put in a water supply state, the float 5 rises following the water surface according to the water supply from the water supply port. When the water level reaches an appropriate level, the inner cylinder is pulled into the outer cylinder by the urging force of the helical springs 3, 4, and the water stopping state is established. The shaft 6 to which the float is attached is rotatably attached to the stopper 17, and the position of the float is changed by the rotation of the stopper to adjust the water level.BACKGROUND OF THE INVENTION【課題】水を導く管(筒)内で詰まりが生じにくく、豪雨等で流速が増して乱流が起きたとしても、確実に止水ができ、しかも、異なる場所に設置しても任意の水位に調整できる灌漑用水止水栓を提供する。【解決手段】灌漑用水止水栓100は、田圃と用水路との間に起立させて設置される。田圃の水が少ない水位h1の時に、内筒2を外筒1から引っ張り出して給水状態にしておくと、給水口からの給水に応じてフロート5が水面に追従して上昇していく。そして、適量の水位になると、つるまきばね3,4の付勢力により内筒が外筒内に引っ張り込まれて止水状態になる。フロートを取り付けたシャフト6は、ストッパー17に回動可能に取り付けられ、ストッパーの回動によってフロートの位置を変えて水位を調整する。【選択図】図1
