Can waterways which are prone to flooding be dug deeper to help prevent flooding? Like just digging big trenches through the bed of the waterway?
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The level of water in a river cannot be dictated locally. Where a river crests is dictated by start and finish elevations and flow rates, to name a couple variables. Digging the riverbed deeper would only serve to slow the flow down. You would end up with a deep pool and a calm flow at the same elevation it was before.
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