FIELD: agriculture, particular, melioration; applicable in automatic regulation of the ground water level on closed drainage-irrigation systems. SUBSTANCE: the offered device includes shutoff member in form of two valves 3 and 4 connected with head of outlet drain 5. Valves 3 and 4 are interconnected for moving relative to each other. One of valves 4 has guides 13 for direction of water flow to second valve 3 from the inner side. EFFECT: higher efficiency. 2 dwg
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