Outline Of North Dams Office
Summary of Main Land of Okinawa
History of Water Resources Development
Condition & Demand of Water
Elements Chart of Dams
Water Resources Development in Okinawa
Okukubi Dam is the world first trapezoidal CSG Dam
New Technology and Environment
Projects of Dam Development
Elements Chart of Dams
  Unit Completion
Items   \   Names of Dam
Fukuji Dam Arakawa Dam Aha Dam Fungawa Dam Benoki Dam Kanna Dam Kurashiki Dam Haneji Dam Taiho Dam 9 Total
Name of River - Fukuchi River Arakawa River Aha River Fun River Benoki River Kanna Fukuji River Yonabaru River Haneji River Taiho River  
Function - F.N.W.I F.N.W.I F.N.W.I F.N.W.I F.N.A.W F.N.W F.N.A.W F.N.A.W F.N.W  
a
r
e
a
Catchment Area km2 32.0 7.4 22.5 8.9 8.1 7.6 4.7 10.9 13.3 115.4
Reservoir Area km2 2.54 0.16 0.83 0.31 0.50 0.55 0.77 1.15 0.89 7.70
S
t
o
r
a
g
e

C
a
p
a
c
i
t
y
Gross Capacity 103 m3 55,000 1,650 18,600 3,050 4,500 8,200 7,100 19,800 20,050 137,950
Effective Capacity 103 m3 52,000 1,250 17,400 2,550 4,000 7,800 6,900 19,200 19,350 130,450
Flood Control 103 m3 7,300 650 4,800 1,600 2,400 1,150 1,000 3,600 2,150 24,650
Water Utilization Unspecified Used Water 103 m3 2,000 100 200 150 150 240 2,350 2,600 1,320 9,110
Municipal Water Water Supply
(Developed Water)
103 m3/day 37,400
(103,200m3
/day)
440
(15,700m3
/day)
10,900
(65,700m3
/day)
700
(23,700m3
/day)
1,270
(18,400m3
/day)
4,670
(11,500m3
/day)
3,550
(35,100m3
/day)
5,900
(12,000m3
/day)
15,880
(94,800m3
/day)
80,710
(380,100m3
/day)
Industrial Water
(Developed Water)
103 m3/day 5,300
(14,800m3
/day)
60
(2,300m3
/day)
1,500
(9,300m3
/day)
100
(3,300m3
/day)
180
(2,600m3
/day)
(A)1,740
(12,000m3
/day)
- (A)7,100
*(56,600m3
/day)
-
15,980
(100,900m3
/day)
Sub-Total
(Developed Water)
103 m3
/day
42,700
(118,000m3
/day)
500
(18,000m3
/day)
12400
(75,000m3
/day)
800
(27,000m3
/day)
1,450
(21,000m3
/day)
6,410
(23,500m3
/day)
3,550
(35,100m3
/day)
13,000
(68,600m3
/day)
15,880
(94,800m3
/day)
96,690
(481,000m3
/day)
Total 103 m3
/day
44,700 600 12,600 950 1,600 6,650 5,900 15,600 17,200 105,800
D
a
m
Type - R G Main
Dam
G
Sub
Dam
R
G C(G-R) Main
Dam
G
Sub
Dam
R
Main
Dam
G
Sub
Dam
R
R Main
Dam
G
Sub
Dam
R
 
G R
Height m 91.7 44.5 86.1 32 41.5 42 35 45 37 33.5 15 66.5 77.5 66  
Crest Length m 260 177 245 77 210 230 330 185 500 441 200 198 363 445  
Dam Volume 103 m3 1,622 74 414 78 70 130 440 72 991 876 80 1,050 400 1,930  
Elevation of Crest EL.m 90 165 114 115 137 184 184 33 35 69 74 74 75  
Year of Completion of Construction - Redevelopme
nt 1991
1977 1983 1983 1988 1993 1996 2005 2011  
Project Cost 109YEN 1,023 360 495 700 1,370   

  Unit Under Construction
Items   \   Names of Dam
Okukubi Dam 
Name of River - Okukubi River 
Function - F.N.A.W 
a
r
e
a
Catchment Area km2 14.6
Reservoir Area km2 0.61
S
t
o
r
a
g
e

C
a
p
a
c
i
t
y
Gross Capacity 103 m3 8,560
Effective Capacity 103 m3 7,860
Flood Control 103 m3 2,500
Water Utilization Unspecified Used Water 103 m3 1,250
Municipal Water Water Supply
(Developed Water)
103 m3/day 2,970
(10,300m3/day)
Industrial Water
(Developed Water)
103 m3/day (A)1,140
*(7,300m3/day)
Sub-Total
(Developed Water)
103 m3/day 4,110
(17,600m3/day)
Total 103 m3/day 5,360
D
a
m
Type - Trapezoidal
CSG Dam 
Height m 39 
Crest Length m 462 
Dam Volume 103 m3 339 
Elevation of Crest EL.m 29
Year of Completion of Construction -
Project Cost 109YEN 490 
Note 1)Function (F : Flood Control, N : Unspecified Used Water, W : Water Supply, A : Specified Irrigation)
2)Type (G : Concrete Gravity Dam, R : Rockfill Dam, C : Combined Dam
* Maximum amount of intake water

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