PROBLEM TO BE SOLVED: To control the opening of a dam gate to an appropriate value while suppressing control delay.;SOLUTION: A gate control device 10 for controlling a dam gate 3 includes: a water level measuring unit 11 measuring a dame water level H; a target opening setting unit 12 setting a target opening DT of the dam gate 3 on the basis of a clearance G between the dam water level H measured by the water level measuring unit 11 and the dam gate 3; a driving control unit 13 driving the dam gate 3 on the basis of the target opening DT set by the target opening setting unit 12; and a predicted water level calculation unit 14 predicting a dam water level at planned time at which a dam gate opening reaches the target opening DT. The target opening setting unit 12 corrects the target opening DT of the dam gate 3 on the basis of a clearance between the predicted dam water level calculated by the predicted water level calculation unit 14 and the dam gate 3.;COPYRIGHT: (C)2015,JPO&INPIT
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