The Bergeforsen power plant in the river Indalsälven was built in the early 1950’s. However, no seepage measurements have been possible because 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.
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BERGEFORSEN EMBANKMENT DAM
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 also continuous measurements started.
Initial measurements indicate excellent result which is necessarily 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 (the first three in the left side in the figure). A general increasing temperature with depth is seen for all standpipes. The initial temperature measurements indicate normal homogenous and normal seepage flow.