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Naoyuki OTA Geo-hazard and risk mitigation Laboratory, Disaster Prevention Technology Division Groundwater levels in embankments often rise due to heavy rainfall, which can occasionally cause embankments to collapse. In order to decrease the ground water level, it is important to take countermeasures to drain the water from areas in embankments which could weaken in heavy rain. The drain pipe method for embankments has been adopted widely by Japanese railways as a water draining method.doi:10.2219/rtriqr.56.4_272 fatcat:7ijpx7vakvftfjrutxqytn2q7m