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Saturday, 21 Oct 2017

Bergeforsen Embankment Dam

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The Bergeforsen power plant in the river Indalsälven was built in the early 1950’s. However, no seepage measurements have been possible because of a high downstream water level. A complementary installation was made in 2005, where 17 new standpipes were drilled from the downstream berm down to the bedrock in order to measure the temperature in the seepage water. Optical fibres were installed in the new standpipes, in five old standpipes, and also in the upstream water. A Sensornet DTS unit was installed in September 2005, when continuous measurements also started.

Initial measurements indicate excellent results which are necessary to detect the small expected seasonal temperature changes, may be less than 1ºC. Measurements are performed both at going down and up in each standpipe, which gives a symmetrical result. No significant temperature anomaly is observed, but the temperature seems to be slightly higher at the first standpipes close to the spillway. A general increasing temperature with depth is seen for all standpipes. The temperature measurements indicate normal homogenous and low seepage flow.