Why does water released from Danube River reservoirs erode downstream banks?

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Water released from Danube River reservoirs erodes downstream banks because the impounded water loses its silt load while held in the reservoir. As a result, the water flowing out of the dam is relatively silt-free. This "hungry" water, lacking its natural sediment load, compensates by picking up material from the riverbed and banks farther downstream, leading to increased erosion.1