RESEARCH REPORT AT THE NENOTANI-GAWA RIVER IN THE OTA-GAWA RIVER BASIN DURING THE HEAVY RAIN EVENT OF JULY 2018

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 Heavy rain in July 2018 breached levees, eroded riverbanks, washed out bridges, and flooded non-embanked areas of the national control section of the Misasa River, a tributary of the Ota River system. On the other hand, the Nenotani River, another subsidiary stream of the Ota River system, was relatively protected from severe damage, thanks to the river improvement promoted after heavy rain in August 2014. This report examines the flood damages that occurred in the Ota River basin and the subsequent emergency measures, and verifies the effects of river improvements to the Nenotani River through flood simulation.