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5th International Conference on Rain Water Cistern Systems
"Rainwater Catchment for Future Generations"
Keelung, Taiwan, R.O.C. - August 1991

Section 3: Catchment and Storage System Designs

Page 108

Hong-Lo Transbasin Rainwater Harvesting Works For The Cheng-Kung Reservoir In Penghu

Li-Jen Wen
Council of Agriculture, R.O.C.


The Penghu Pescadores located in the west of Taiwan Proper are scarce in' water. The annual precipitation is only about 1,000 mm which is much less than the measured evaporation of 1,800 mm. The water supply there entirely relies on the surface runoff and groundwater. In the dry year, the domestic water supply entirely depends on the groundwater even up to 100% as most of the reservoirs dry up.

Due to lack of geological and meteorological data, hydrologic analysis was extremely; difficult for planning reservoirs especially in the early stage of development. At present, there are five surface-water reservoirs and one underground reservoir with a total effective capacity of 3.9 million cubic meters, of which the Chengkung Reservoir with a capacity of 1.04 million cubic meters, is selected for study.

This paper is to review the hydrologic analysis of the Chengkung Reservoir and to illustrate its transbasin rainwater harvesting system which was completed in the recent year. It is emphasized that continued efforts on collection of geological and hydrological data are to be made for application of the improved methodology in hydrological analysis for planning cisterns on the water-scarcity off-shore islands.

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