Sediment Disaster of Okaya in July 2006 based on Rainfall Characteristics

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  • 降雨特性から見た平成18年7月岡谷土砂災害について
  • コウウ トクセイ カラ ミタ ヘイセイ 18ネン 7ガツ オカヤ ドシャ サイガイ ニ ツイテ

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Between 15^<th> and 24^<th> of July in 2006, there was a heavy rainfall, in several areas of the central western region of Japan. It was the biggest rainfall in recorded history in the Suwa and Kami-Ina areas of Nagano prefecture. From results of a study in Okaya city which was affected by a debris flow, rainfall was the main focus as it was the direct cause of the Okaya sediment disaster. This study is to analyze by monitoring rainfall data to predict future disaster risk in Okaya. After collecting official rainfall data and forecasting of the risk level of sediment disasters and then determining the critical line for warnings of sediment disaster, it was concluded that there was no doubt this disaster could have occurred in any part of the Okaya area due to the heavy rainfall.

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