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silt (noun) sand, mud, soil, etc., a river leaves at its bed or in a harbour.
Silt is sand, mud, soil, etc., or a mixture of all of them a river carries along its course and leaves at its bend, mouth or in a harbour. Silt makes rivers and coastal sea waters less and less deep and cause problems to ships. Desilting is the removal of silt by huge dredges.
- Silt at the entrance to a port poses a big problem to ships. Because of the sand, mud, soil in the silt the ports might not be deep enough to receive ships.
- The silt at the harbour has to be dredged once every year for the ships to sail into it safely. If the sand, mud, soil, etc., forming the silt is not removed, ships run aground and can't move.