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The most common reason to dredge a river is to provide depth for water traffic, allowing boats, ships, and barges to travel safely. Other reasons can be to avoid flooding up river from a channel being clogged or backed up. In some cases this will insure that the channel doesn't reform in another place, causing damage to homes, roads and bridges. Another reason is to eliminate silt which can fill in lakes, ponds and behind dams. This can cause flooding and damage hydroelectric plants.
Wiki User
∙ 17y ago
Wiki User
∙ 13y agoRivers are mostly deepened so that the channel can hold more water.
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