Project description
In connexion with construction of Kjosnesfjorden hydro power station the reservoir at Trollavatn shall be regulated from existing level 985 to 1001.4 m. This results in the construction of two small dams, both rockfill dams with central asphalt core. At present, more than 80 such dams have been built world-wide, and the performance of all these dams has been very good.
As both dams are fairly low, 25 and 20 m, respectively, the asphalt core is only 40 cm wide and the connection to the good rock base is much simplified.
The asphalt will be produced at a modern asphalt plant at Forde city, approximately 70 km from the dams and transported to site in insulated tippers. The other dam zones are produced from tunnelling material and quarry on site.
Dimensions
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Main dam
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Saddle dam
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Maximum dam height:
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25 m
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20 m
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Length of dam crest:
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360 m
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110 m
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Level at top:
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1004.6 m
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1004.0 m
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Crown width:
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5.0 m
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5.0 m
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Up- and downstream slope:
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1: 1.5
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1: 1.5
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The asphalt core works begun in late May 2008 and was completed October 2008.
