The present invention relates to an automatic sluice for maintaining the water level at the reservoir side within a certain range at all times by installing in a waterway or a related waterway of a river or a relatively small reservoir, and for detecting the water level of the water level sensor. Accordingly, the opening and closing operation is automatically performed by the cylinder, and the water stored in the lower part of the water storage side is smoothly opened when opening, and the opening and closing operation is smoothly performed even if soil or gravel accumulates on the bottom of the water side close to the hydrologic main body. In addition, it is a task to provide an automatic flood gate that can prevent drainage of the floodgate body by causing a rapid drainage, and especially a stone or a tree stratifying the floodgate body during a flood.;The automatic sluice of the present invention includes walls 1 and 1 constructed at predetermined intervals on both sides of the water channel, supports 2 fixed upright to the upper portions of the walls 1, and both supports 2 The horizontal support (3) is fixed to both ends in the longitudinal direction, and a hollow rectangular plate shape, while the upper end is provided with a rotating shaft (4a) between the wall (1) to form a slope with the channel bottom The hydrological main body 4 and the hydrological main body 4, which are arranged at the both ends in the longitudinal direction of the rotational shaft 4a, and are rotatably coupled to each wall 1, and lift the hydrological main body 4 around the rotational shaft 4a. One end of the longitudinal direction is rotatably coupled to the upper surface of the sluice body 4 and the other end is rotatably coupled to the horizontal support (3) and to detect the water level on the reservoir side Level detection sensor (6) for the cylinder, according to the level detection of the water level sensor Or by being reduced to a water gate body rotates around the rotation axis, it characterized in that an automatically opening and closing.;The automatic sluice of the present invention is that the opening and closing operation is automatically performed by the water level detection of the water level sensor, as well as the water of the bottom of the water storage side through the drainage space formed between the water reservoir side surface and the bottom of the waterway when in the open state. Since it is drained smoothly it can prevent red tide and green algae. In addition, since the lower part of the hydrologic main body rotates to the upper part of the drainage side during the opening operation, the opening operation is smoothly performed even if soil or gravel is accumulated at the bottom of the waterway close to the hydrologic main body. In addition, since the drainage is made to the lower part of the sluice body, the drainage cross-sectional area can be maximized to achieve rapid drainage, and in particular, there is no fear that the sluice body may be damaged due to a collision of stones or trees with the sluice body during drainage.
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