Lake Sagami (相模湖, Sagami-ko) is an artificial lake located in Midori-ku, Sagamihara, Kanagawa in Japan's Kantō region. Created in 1947 after the Sagami River was dammed, it serves as use for recreational and hydroelectric purposes.[1][3] The lake also served as venue for canoeing events at the 1964 Summer Olympics held in Tokyo, located 60 kilometres (37 mi) from the lake.[3][4]
Water and land usage surrounding the lake
Typical lake flows (in m3/s) are 85 hydroelectric, 10.34 domestic, 4.16 irrigation, and 2.15 industrial.[2] Land usage is 87.5% natural, 4.6% agricultrual, and 7.9% other.[2] Eutrophication issues have been a serious issue of the lake that was first observed in 1967.[1] The main issue was microcystis algae bloom and reached its highest cell count of 2,500,000 cells/mL in July-October 1979 (data from 1985).[1] Most vegetation grown around the lake are grassland and weeds while most crops grown are rice and vegetables.[1] Fertilizer application for crops near the lake is moderate.[1]
Recreational uses
Because of the lake's creation in 1947, it displaced the careers of many local fishermen in the area.[5] In return for their livelihood being taken away, many of these families were offered rental boats in the new lake.[5] No private boats are allowed on the lake as a result.[5] To compensate for the loss of the smelt, black bass from the United States was imported to the lake as was Prussian carp.[5] Because of the bass, the lake is a popular recreational fishing area.[5] The lake is also used for couples dating for boat rides and families. Row boat standard daily rental rates are ¥3000 for one person, ¥4500 for two people, and ¥6000 for three people.[5]
Water treatment
In 1984, there were 170 industrial and four municipal sewage treatment plants surrounding the lake.[1]
References
External links
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