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Table 1.

Number of dams in Japan by year of completion and by purpose.

Completion year of damNumber of damsPurpose of dam (can be multiple)Number of dams
Before 1000 AD Agricultural use 2,048 
1001–1899 661 Municipal and industrial use 501 
1900–1945 692 Hydroelectric power use 630 
1946–1999 1,534 Flood control 650 
2002–2008 162 Others 58 
Total 3,058 Total 3,887 
Completion year of damNumber of damsPurpose of dam (can be multiple)Number of dams
Before 1000 AD Agricultural use 2,048 
1001–1899 661 Municipal and industrial use 501 
1900–1945 692 Hydroelectric power use 630 
1946–1999 1,534 Flood control 650 
2002–2008 162 Others 58 
Total 3,058 Total 3,887 

Note: If a dam is multipurpose, the purposes of the dam are counted respectively. Thus, the numerical value of dam by purpose is not equal to the numerical value of dam by year of completion.

Source:Japan Commission on Large Dams (2009).

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