Shiroyama Dam
Encyclopedia
The is a multi-purpose dam
on the main stream Sagami River
in Sagamihara
, Kanagawa Prefecture
on the island of Honshū
, Japan
.
-Kanagawa
industrial belt. Work on the Sagami Dam
, the first dam on the main stream of the Sagami River began in 1938; however, lack of funding and the advent of World War II
delayed completion until after the end of the war. Work on the Shiroyama Dam, in the former town of Tsukui
, Tsukui District
commenced in 1960 and was completed in 1965 by the Kumagai Gumi
construction company.
gravity dam. It was designed to provide flood control
, and industrial and drinking water to the cities of Yokohama, Kawasaki, Yokosuka
and the Shōnan
area. It also serves as a Pumped-storage hydroelectricity
facility in conjunction with the Honzawa Dam
further upstream. The associated Shiroyama Hydroelectric Power Plant has a rated capacity of 250,000 kW of power, and the Tsukui Hydroelectric Power Plant has an additional capacity of 25,000 kW. The reversible turbine generators at the Shiroyama Power Plant were designed to function as either electrical power generators, or as pumps, to reverse the flow of water back into the reservoir of the Honzawa Dam in times of low demand.
created by the dam is a major leisure destination in Kanagawa Prefecture, popular with boaters, fishers and campers.
Dam
A dam is a barrier that impounds water or underground streams. 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. Hydropower and pumped-storage hydroelectricity are...
on the main stream Sagami River
Sagami River
The is a river in Kanagawa and Yamanashi Prefectures on the island of Honshū, Japan.The upper reaches of the river in Yamanashi prefecture are also sometimes known as the , and the portion near the river mouth as the...
in Sagamihara
Sagamihara, Kanagawa
is a city located in north central Kanagawa Prefecture, bordering Tokyo, Japan. It is the third most populous city in the prefecture, after Yokohama and Kawasaki, and the fifth most populous suburb of Greater Tokyo. Its northern neighbor is Machida, with which a cross-prefectural merger has been...
, Kanagawa Prefecture
Kanagawa Prefecture
is a prefecture located in the southern Kantō region of Japan. The capital is Yokohama. Kanagawa is part of the Greater Tokyo Area.-History:The prefecture has some archaeological sites going back to the Jōmon period...
on the island of Honshū
Honshu
is the largest island of Japan. The nation's main island, it is south of Hokkaido across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyushu across the Kanmon Strait...
, Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
.
History
The potential of the Sagami River valley for hydroelectric power development began to be developed in the 1930s, with the growth of industry and electrical consumption in the YokohamaYokohama
is the capital city of Kanagawa Prefecture and the second largest city in Japan by population after Tokyo and most populous municipality of Japan. It lies on Tokyo Bay, south of Tokyo, in the Kantō region of the main island of Honshu...
-Kanagawa
Kawasaki, Kanagawa
is a city located in Kanagawa Prefecture, Japan, between Tokyo and Yokohama. It is the 9th most populated city in Japan and one of the main cities forming the Greater Tokyo Area and Keihin Industrial Area....
industrial belt. Work on the Sagami Dam
Sagami Dam
The is a multi-purpose dam on the main stream Sagami River in Sagamihara, Kanagawa Prefecture on the island of Honshū, Japan.-History:The potential of the Sagami River valley for hydroelectric power development began to be developed in the 1930s, with the growth of population in the Shonan region,...
, the first dam on the main stream of the Sagami River began in 1938; however, lack of funding and the advent of World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
delayed completion until after the end of the war. Work on the Shiroyama Dam, in the former town of Tsukui
Tsukui, Kanagawa
was a town located in Tsukui District, Kanagawa, Japan.On March 20, 2006 Tsukui, along with the town of Sagamiko, also from Tsukui District, was merged into the expanded city of Sagamihara, and thus no longer exists as an independent municipality...
, Tsukui District
Tsukui District, Kanagawa
was formerly a district located in Kanagawa Prefecture, Japan. It was abolished on March 11, 2007 through merger into the neighboring city of Sagamihara.As of July 1, 2004, the district had an estimated population of 73,718. The total area was 238.44 km²...
commenced in 1960 and was completed in 1965 by the Kumagai Gumi
Kumagai Gumi
is a construction company founded in Fukui, Fukui Prefecture, Japan. The company still has registered headquarters in Fukui, but the actual head office is located in Shinjuku, Tokyo.Kumagai Gumi was removed from the Nikkei 225 index on Oct...
construction company.
Design
The Shiroyama Dam is a hollow-core concreteConcrete
Concrete is a composite construction material, composed of cement and other cementitious materials such as fly ash and slag cement, aggregate , water and chemical admixtures.The word concrete comes from the Latin word...
gravity dam. It was designed to provide flood control
Flood control
In communications, flood control is a feature of many communication protocols designed to prevent overwhelming of a destination receiver. Such controls can be implemented either in software or in hardware, and will often request that the message be resent after the receiver has finished...
, and industrial and drinking water to the cities of Yokohama, Kawasaki, Yokosuka
Yokosuka, Kanagawa
is a city located in Kanagawa, Japan. As of 2010, the city had an estimated population of 419,067 and a population density of 4,160 people per km². It covered an area of 100.62 km²...
and the Shōnan
Shonan
is the name of a region along the coast of Sagami Bay in central Japan. Centered on Enoshima, an island about 50 kilometers southwest of Tokyo, the Shōnan region stretches from Ōiso in the west to Hayama in the east, including Chigasaki, Kamakura and Hiratsuka...
area. It also serves as a Pumped-storage hydroelectricity
Pumped-storage hydroelectricity
Pumped-storage hydroelectricity is a type of hydroelectric power generation used by some power plants for load balancing. The method stores energy in the form of water, pumped from a lower elevation reservoir to a higher elevation. Low-cost off-peak electric power is used to run the pumps...
facility in conjunction with the Honzawa Dam
Honzawa Dam
is a dam in Kanagawa Prefecture, Japan....
further upstream. The associated Shiroyama Hydroelectric Power Plant has a rated capacity of 250,000 kW of power, and the Tsukui Hydroelectric Power Plant has an additional capacity of 25,000 kW. The reversible turbine generators at the Shiroyama Power Plant were designed to function as either electrical power generators, or as pumps, to reverse the flow of water back into the reservoir of the Honzawa Dam in times of low demand.
created by the dam is a major leisure destination in Kanagawa Prefecture, popular with boaters, fishers and campers.