
Silt up
Natural process
Silt up often references natural environmental changes in rivers or lakes.

Many lakes silt up over centuries.
Result of activity
It can imply negative consequences of human activities like construction or deforestation.

Poor farming practices will eventually silt up the downstream riverbed.
Navigation issues
Silt up can refer to difficulties in navigation for boats due to sediment.

We couldn't dock because the harbor had silted up over the years.
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