This system is effective at first, but over time the runoff will deposit silt in the channel and clog the spaces in the gravel bed.

With its frequent floods, it often changed course, causing erosion and depositing silt in other places.

Over long stretches of time between the great floods, dry winds deposited silt.

These rivers regularly flood, depositing silt onto the farmlands and sometimes causing death or hardship.

After the sea retreated in the Triassic, streams deposited silt before the area was uplifted and underwent erosion.

The sand was formed during the last ice age, when large glacial lakes formed and deposited silt.

The result was rapid erosion, depositing silt into the Sebeya River.

The rising waters deposited silt and mud onto the original land surface, covering and preserving it.

Glaciation grinding down an ancient range, depositing rich silt and bedrock meltwater water systems.

The flood deposited rich silt on the river's banks, allowing the Egyptians to grow crops.