Dams Dahan River

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dahan river , luo-fu bridge above shihmen reservoir


due lack of natural water source taoyuan plateau, thousands of artificial ponds constructed capture summer rainfall irrigation, making area 1 of taiwan s productive agricultural regions. in 1928 taoyuan canal dug divert water dahan river near present location of shihmen dam. canal enabled more constant water supply taoyuan , returned water old channels of river had been cut off thousands of years ago. due urbanization, dahan river increasing in importance domestic water source, while use irrigation has decreased.


the shihmen dam, 1 of taiwan s first multi-purpose water projects, completed in 1964. provides flood control, irrigation, domestic water supply , hydroelectricity of taoyuan , new taipei city. dam has had problems silt build-up since construction, due high rate of erosion caused typhoon storms , earthquakes in upper dahan river drainage. 123 sabo dams (check dams) have been built along dahan river upstream in order block silt , extend useful life of shihmen reservoir. chief among these junghua dam, 26 kilometres (16 mi) upstream. second largest dam, baling dam, failed during typhoon wipha in 2007, destroying baling village , washing 10,000,000 cubic metres (350,000,000 cu ft) of silt dahan river.


the taiwanese government has proposed construction of mega-dam on takekan creek known gaotai dam (高台壩) trap silt , provide additional water storage. plan has been criticized due potential environmental damage, , limited useful life, because new reservoir fill silt.








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