Sasamagawa Dam

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Sasamagawa Dam
Sasamagawa-1166-r1.jpg
Official name 笹間川ダム
Location Shizuoka Prefecture, Japan
Coordinates 34°58′17″N138°05′38″E / 34.97139°N 138.09389°E / 34.97139; 138.09389 Coordinates: 34°58′17″N138°05′38″E / 34.97139°N 138.09389°E / 34.97139; 138.09389
Construction began 1955
Opening date 1960
Operator(s) Chubu Electric Power
Dam and spillways
Impounds Sasama River
Height 46.4 meters
Length 140.8 meters
Reservoir
Total capacity 6,340,000 m3
Catchment area 2025.8 km2
Surface area 46 hectares

The Sasamagawa Dam(笹間川ダム,Sasamagawa damu) is a dam on the Sasama River, a tributary of the Ōi River, located on the border of the city of Shimada and the town of Kawanehon, Shizuoka Prefecture on the island of Honshū, Japan.

Dam A barrier that stops or restricts the flow of surface or underground streams

A dam is a barrier that stops or restricts the flow of water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC.

Ōi River river in Japan

The Ōi River is a river in Shizuoka Prefecture, Japan.

Shimada, Shizuoka City in Chūbu, Japan

Shimada is a city located in Shizuoka Prefecture, Japan.

Contents

History

The potential of the Ōi River valley for hydroelectric power development was realized by the Meiji government at the start of the 20th century. The Ōi River was characterized by a high volume of flow and a fast current. Its mountainous upper reaches and tributaries were areas of steep valleys and abundant rainfall, and were sparsely populated. In 1906, a joint venture company, the Anglo-Japanese Hydroelectric Company(日英水力電気,Nichiei Suiroku Denki) was established, and began studies and design work on plans to exploit the potential of the Ōi River and Fuji River in Shizuoka Prefecture. The British interests were bought out by 1921, and the company was renamed Hayakawa Electric(早川電力,Hayakawa Denryoku). By the mid-1950s, numerous dams had been constructed on the main flow of the Ōi River, and developers began to turn their attention to its various tributary streams.

A Joint Venture (JV) is a business entity created by two or more parties, generally characterized by shared ownership, shared returns and risks, and shared governance. Companies typically pursue joint ventures for one of four reasons: to access a new market, particularly emerging markets; to gain scale efficiencies by combining assets and operations; to share risk for major investments or projects; or to access skills and capabilities.

Fuji River river in Japan

The Fuji River is a river in Yamanashi and Shizuoka Prefectures of central Japan. It is 128 kilometres (80 mi) long and has a watershed of 3,990 square kilometres (1,540 sq mi). With the Mogami River and the Kuma River, it is regarded as one of the three most rapid flows of Japan.

Tributary stream or river that flows into a main stem river or lake

A tributary or affluent is a stream or river that flows into a larger stream or main stem river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean.

The Sasamagawa Dam and neighboring Shiogo Dam were constructed to provide water for the 58,000 KW Kawaguchi Hydroelectric Plant built by the Shimada city government. Construction work began in 1955 and was completed by 1960 by the Hazama Corporation. The dam serves a secondary purpose in providing water for irrigation to farms in the surrounding area.

Design

The Sasagawa Dam was designed as a solid core concrete gravity dam with a central spillway.

Gravity dam

A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by primarily using the weight of the material alone to resist the horizontal pressure of water pushing against it. Gravity dams are designed so that each section of the dam is stable, independent of any other dam section.

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References

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