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Located at the most upper area of the Tone
Basic information of Yagisawa Dam
Japan with 16,800km2.
29 million people who live in metropolitan
area depend on the Tone River for their water.
Type ：Arch
Height ：131 ｍ
res eng ： ｍ
Reservoir area：5.1 km2
Total Storage Capacity： About 200 million m3
Operation started in October, 1967
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Situation of Yagisawa Dam in winter
Reservoir Around the dam office
Snow is really nuisance for dam operation and maintenance, but snow meltsraduall in s rin and becomes the recious water resources
Snow blower Snow vehicle
Run-off volume of snow melt accounts for almost 40% of annual run-off volume (Yagisawa Dam makes the most of snow)
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Yearly change of the water level of the reservoir
120,000,000
140,000,000
平成16年 平成17年 平成18年貯水量(m3)
Water utilization capacity 115.5 million m3
60,000,000
80,000,000
100,000,000
20,000,000
40,000,000 No demand for irrigation.
Water level recovers again
0
Flow volume in Tone River
decreases because of a long
spell of dry and clear weather.
a er eve recovers
rapidly by melt of snow
decreases sharply because of a
long spell of scorching weather.
Water lever goes down very
water supply. qu c y y wa er supp ybecause of huge demand for
domestic water consumption
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Annual snow depth from 1967 to 2007
累 雪 量
1,867
7
1,9812,000
(cm)
1,391
1,704
1,3331,375
1,692
1,341
,
1,546 1,539
1 400
1,600
1,800
,
1,137
1,259
1,027 1,057983
1,2101,183
1,091
949 938918
1,251
905
1,156
1,088
1,257
936975
1,174
1,074
1,142
1,055
1,000
1,200
ｍ
712767
538
724677
818
720
600
800
200
400
42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 元 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
年 月 日(Year)
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Features of run-off volume and precipitation in
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Different types of snow gauge for accurate data
collectionOptical snow gage
Snow scales
er snow gages
(used antifreeze solution)
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Different types of radar for accurate rain data collection (1)
- C band radar-The Ministry of Land, Infrastructure and Transport (River Bureau) and The Meteorological
Agency own 26 radars and 20 radars respectively
Image of radar screen
Material source : Tonegawa Integrated Dam and Reservoir Group Management Office, MLIT and NHK
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Different types of radar for accurate rain data collection (2)
- X band radar-
The Ministry of Land, Infrastructure and Transport (Sabo) , The local governments,
Municipalities, Universities, Research Institutes (such as Meteorological Research Institute)
etc. own
Material source : Tonegawa Integrated Dam and Reservoir Group Management Office, MLIT
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Could you find the relevancy between my
of this workshop ?
Thank you very much for your attention
