| 摘要 |
PROBLEM TO BE SOLVED: To provide a regulator for the water surface height of a water drainage port simply installed in the water drainage port of a rice cropping paddy field and readily and optionally regulating the water surface height with a simple structure. SOLUTION: The regulator for the water surface height of the water drainage port is installed in the water drainage port of the rice cropping paddy field. In the regulator, one end of a bottom plate is pivoted on the bottom on the side of the paddy field between a left and a right side plates and the other end is rotatably arranged. COPYRIGHT: (C)2003,JPO
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