A measurement control device (100) determines a predicted water-level peak value on the basis of the prediction results of water-level changes. The measurement control device (100) calculates a water-level reference value at which water-level measurement is started in accordance with the determined predicted peak value. The measurement control device (100) determines a predicted timing at which the water level is predicted to reach the calculated reference value on the basis of the prediction results of water-level changes. The measurement control device (100) controls a timing at which the water-level measurement by means of a sensor device (101) is started on the basis of the determined predicted timing.
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