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Thac
Ba Reservoir
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Location:
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2l°42'-22°05'N, l04°45'-105°03'E; 10 km from Yen Bai Town and one km from Yen Bink District Town, southeastern Hoang Lien Son Province. |
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Area:
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23,400 ha. |
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Altitude
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40-60m. |
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Biogeographical
Province:
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4.10.4. |
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Wetland
type:
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17. |
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Description
of site:
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A large water storage reservoir created in 1963 by a dam on the Chay River. The difference in elevation between the bed of the river upstream and downstream of the reservoir is 30m. The reservoir has a deeply indented shoreline with many bays, peninsulas and islands. To the north lies the high plateau of Cao Khanh at about 400m elevation. |
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Climatic
conditions:
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Tropical monsoonal climate with an average annual rainfall of 1,786 mm, a mean annual temperature of 22.9°C and a mean relative humidity of 85%. |
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Principal
vegetation:
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Some reed-beds, marsh grasses and low shrubs. The region was formerly covered with lowland rain forest, but this soon disappeared with the construction of the reservoir. |
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Land
tenure:
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Owned by the People's Committee of Hoang Lien Son. |
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Conservation
measures taken:
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There are restrictions on cultivation on the steep slopes surrounding the reservoir and deforestation in the watershed. Reafforestation is being promoted in the catchment area to reduce soil erosion. |
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Conservation
measures proposed:
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Land
use:
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Fishing, irrigation, hydro-electric power and recreation. |
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Possible
changes in land use:
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| Disturbances and threats: | The main threat is siltation, which is seriously reducing the life span of the reservoir. An estimated 5.35 million tonnes of silt enter the reservoir each year. Because of this siltation, it is no longer possible to generate electricity during the dry season. |
| Economic and social values: | In addition to providing water for irrigation and generation of electricity, the reservoir supports a large fishery which constitutes a very important protein source for the local population. Fish producion is currently 100-150 metric tonnes per year. |
| Fauna: | The reservoir is an important staging and wintering area for a variety of migratory waterfowl. Prior to the construction of the reservoir, the forests of this region were very rich in wildlife. It is hoped that with reafforestation in the area, wildlife populations will recover. |
| Special floral values: | No information. |
| Research and facilities: | |
| Criteria for inclusion: | 3b. |
| References: | |
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Source:
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Le Dien Duc. |