Tsengwen Reservoir, the largest man-made lake on Taiwan, is located on the upper reaches of the Tsengwen River, 56 kilometers northeast of Tainan city. This spectacular project, started in 1965 and completed in 1973, has multiple benefits. It has become one of the island's most popular scenic spots with completion of a highway along the dam, hotels and other recreational facilities. The main features of the project include the reservoir, dam, spillway, power plant, Tungkou diversion weir and diversion tunnels. It produces benefits in irrigation, flood control, public water supply and hydroelectric power. The water surface area of Tsengwen Reservoir is 17 square kilometers, when its normal high water level is at E1.225 meters. The gross capacity is 708,000,000 cubic meters. The total cost of the project was more than NT$6,000,000,000 (about US$156,750 million).
The primary objective of the project was to increase irrigation water for 85,424 hectares (about 212,560 acres) of farmland in the Chianan irrigation area. After completion of the project, the annual production of brown rice was increased by 130,000 metric tons and that of sugar by more than 70,000 metric tons. The capacity of public water supply from this project is 228,000 metric tons. Its power plant furnishes the island-wide Tai-power system with an annual output of over 218,000,000 kilowatt-hours. The peak flow of the Tsengwen River to its lower reaches can be controlled to minimize damages caused by flood or drought. In addition, the project has improved public health, helped develop tourism and increased working opportunities.
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