| 1. | These are liable to silt up and a few have washed away.
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| 2. | Logging has accelerated soil erosion and caused rivers and lakes to silt up.
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| 3. | Despite many precautions, the canal silts up with silt from the water supply.
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| 4. | There, it silts up channels and raises water levels, worsening floods.
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| 5. | That caused Packery Channel to silt up in the first place,
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| 6. | In other locations, silt up to deep covers the tracks.
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| 7. | The town was an important base for Barbary pirates until it was silt up.
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| 8. | Heavy rains wash away the soil, which quickly silts up dams, reservoirs and rivers.
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| 9. | It also accelerates soil erosion, causing downstream rivers to silt up and overflow their banks.
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| 10. | The outer ditch was allowed to silt up by the end of the fourth century.
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