Civil engineering and public works
Multi-purpose reservoir
to serve South East Taiwan
CHIANAN PLAIN, a vast area of till-
able land in the south west of Taiwan, will have its supply of irrigation water doubled when the Tsengwen reservoir project is completed in 1973.
The Tsengwen River is to be dammed at its upper reaches to create a reservoir 20 sq. kilometres in area and additionally to provide the hy- dro-power to drive two 50,000 kw generators.
At present the Chianan region is irrigated by a canal system drawing water from the Wushantou reservoir which was completed in 1930. The system serves an area of 79,747 hec- tares of which 69,836 hectares are rotationally irrigated once in three years. Thus only one third of the land is served each year and the limited storage capacity of Wushantou reser- voir falls far short of meeting the demands of crop fields in the area.
The existing Tungkou intake on the Tsengwen River, located six kilo- metres downstream of the proposed Tsengwen damsite, diverts the river water through Tungkou tunnel (capa- city: 55.6 c.m.s.) to feed Wushantou reservoir. Some 33 per cent of the total water flow in Tsengwen River, 39,982 hectare-metres, is diverted annually in this way but the remaining 67 per cent is of no value in irrigation work.
The new reservoir project, sited about 65 kilometres north east of Tainan City, will regulate and make maximum use of the Tsengwen River water to improve and extend the irrigation system. Two thirds of the Chianan Plain will benefit and it is predicted that sugar production will increase by 70,400 metric tons an- nually and crude rice production by 140,600 metric tons. In addition more diversified crops will be possible. The present Wushantou installations can be fully utilized and consequently the two reservoirs can be coordinately operated.
Power generated from the Tsung- wen power plant will join the supply system run by Taiwan Power Com- pany. A dependable generating capacity of 63,900 kW at peak load is envisaged
No. 2 diversion tunnel under construction
and the average annual output is es- timated at 256,180,000 kWh.
By regulating the discharge rate of the Tsengwen River, the project will lower the flood level in the down- stream channel to a safe mark and flood damage along the river will be lessened. The huge capacity of the reservoir will also effectively intercept sediment coming down from upstream and so will protect the river bed down- stream from blocking.
Total cost of the project is estimat- ed at NT$4,707,434,000, which will ed at NT$4,707,434,000, which will
be met by the Taiwan Government and a loan equivalent to US$44 million in Japanese Yen from the Overseas Economic Development Fund of Japan. Part of the local currency will be raised through the flotation of savings bonds.
Annual repayments will be NT$ 358,307,000 from the irrigation of farmland, NT$29,015,000 from public water supply, NT$71,367,000 from power generation and NT$1,327,000 from flood control.
The total annual payoff is NT$ 460,016,000, compared with the an-
Far East BUILDER, May 1969
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