100 years back, building dam lakes was state-of-the-art to protect settlements from flooding and to produce electrical energy. What was not completely known (or thought after) at this time was the necessary amount of stones as bedload that the downstream parts of the river now were deprived of. Calculations indicate that 40.000 metric tons would be necessary to prevent the erosion down-river. Parts of that amount were continuously excavated from the lake for building purposes, but the bigger amount filled up the basin. Now they are rebuilding the retaining weir to accomodate better for the bedload transport, but it remains to be seen how much the residual flow – the bigger amount of water goes to the power plant – is able to move. The power plant itself is one of the really beautiful historical buildings, up to this time almost in original condition outside
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