Dams

  • Chugoku EPCO has so far constructed 30 dams (15m or over in height).

Oodomari dam(Gravity dam)

  • The height of this dam was 64 m when it was constructed in 1935.
  • The dam height was raised by 10.5m in 1959, nearly doubling the effective storage capacity.
  • The revolutionary method for raising the dam height received international attention.

Sasanamigawa dam(Arch dam)

  • The nation's first thin dome type arch dam which was constructed in 1959.
  • This is the first arch dam at Chugoku EPCO.

Onbara dam(Buttress dam)

  • This dam, which was completed in 1928, has a rare buttress structure.
  • Buttress dams are an unusual type, and there are used at only 2 locations at Chugoku EPCO.

Overview of Dams

Oodomari
(Gravity dam)
Sasanamigawa
(Arch dam)
Onbara
(Buttress dam)
Height 74m 67.4m 24.03m
Lenth of top of dam 155m 127.339m 93.64m
Designed flood discharge 804m3/s 700m3/s 70m3/s
Catchment area 123.7km2 91.45km2 9.25km2
Normal water level E.L.532.5m E.L.192m E.L.737.96m
Reservoir capacity 31,100,000m3 20,100,000m3 2,946,300m3

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