Seven Worst Floods in Japan (after WWII)

Until 1960, many people died by floods in Japan. The table below shows 7 worst flood disaster after Word War II. 

	Flood name or cause	Flood name or cause	Number of Deaths	Number of Missings	Year	from MM/DD	to MM/DD
1	Isewan typhoon	伊勢湾台風	4697	401	1959	9/26	9/27
2	Makurazaki typhoon	枕崎台風	2473	1283	1945	9/17	9/18
3	Toya Maru typhoon	洞爺丸台風	1361	400	1954	9/24	9/27
4	Kathleen typhoon	カスリーン台風	1077	853	1947	9/14	9/15
5	Kanogawa Typhoon	狩野川台風	888	381	1958	9/26	9/28
6	1953 North Kyushu Flood	昭和28年西日本水害	759	242	1953	6/25	6/29
7	1953 Wakayama Flood	紀州大水害	615	431	1953	7/17	7/18

As you can see major floods were caused by typhoons. September was the dangerous month in terms of floods. 

Source is Wikipedia.

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