A number of railway companies adopt a method of train operation control that reflects rainfall since the collapse of slope is closely related thereto. Because the relationship between rainfall and changes in the water level is not clear, however, a value of rainfall decided by experience is generally used to regulate train operation. Therefore, a rainfall experiment was conducted by using an embankment model of the same size as that of an actual embankment, in order to grasp the relationship between the rainfall of the light rain after a heavy rain and the behavior of water level in an embankment. It was clarified through experiments that the stability of embankment was in the state to recover when a rain which had a rainfall equal to or less than 3 mm/h continued for about four hours after a heavy rain.

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