Lake Sagami
(2007)
Lake Sagami
Location	Kanagawa
Coordinates	35°36′50″N 139°11′0″E / 35.61389°N 139.18333°E / 35.61389; 139.18333
Type	reservoir
Primary inflows	Sagami River [1]
Primary outflows	Sagami River
Catchment area	1.064 km2 (0.411 sq mi) [1]
Basin countries	Japan
Surface area	3 km2 (1.2 sq mi)
Average depth	19 m (62 ft) [2]
Max. depth	32 m (105 ft) [2]
Water volume	63,200,000 m3 (1.67×1010 US gal) [2]
Residence time	0.05 year [2]
Shore length1	34.4 km (21.4 mi) [2]
Surface elevation	167 m (548 ft)
Frozen	never
Settlements	Sagamihara [3]
References	[1] [2] [3]
1 Shore length is not a well-defined measure.

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% agricultural, 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

Wikimedia Commons has media related to Lake Sagami.