#wikipedia.org. Erchong Floodway. The Erchong Floodway (Chinese: 二重疏洪道) is a major flood control channel of the Tamsui River in New Taipei, Taiwan. Description The Erchong Floodway is approximately 7.7 km (4.8 mi) long and between 450 m (1,480 ft) and 700 m (2,300 ft) wide covering an area of about 424 ha (1,050 acres) in the centre of the Taipei metropolitan area. Located on the le
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