Fig. 3

The rainfall and water level of the Kushida River. The rainfall and the water level were measured respectively at the upper reaches (‘R’ in Fig. 1a) and at the river mouth (‘W’ in Fig. 1b) during a period from May 16 to July 31, 2011 (http://www.data.jma.go.jp/obd/stats/etrn/index.php)