Originally posted by DodgyAgent
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Something like 2% of the water in a catchment is flowing down the river at any one time. Even if you managed to double that by dredging (which you wouldn't), you've still only got a flow of 4%. And you likely just move the problem downstream.
"The river channel is not large enough to contain extreme floods, even after dredging. Dredging of river channels does not prevent flooding during extreme river flows … The concept of dredging to prevent extreme flooding is equivalent to trying to squeeze the volume of water held by a floodplain within the volume of water held in the river channel. Since the floodplain volume is usually many times larger than the channel volume, the concept becomes a major engineering project and a major environmental change."
Don't know much about the Dutch way, but I wager its more about sensible land and water management rather than dredging rivers.

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