[1910 Pre Japanese occupation]
[1920 ~ 1930 Construction for Busan waterworks]
[1940 ~ 1950 Drought in Hwedong Reservoir]
[1960 ~ 1970 First and second phase of waterworks expansion]
[1970~1980 Third and fourth phase expansion of waterworks]
[1980 ~ 1990 Fifth and sixth phase expansion of waterworks]