The river flows into a lake
It will start to deposit it's load when the gradient starts to become shallower which will cause a decrease in energy and so a reduction in ability to transport sediment load.
When the wind starts to slow down it starts to deposit sand or other sediment.
Most sediment washes or falls into a river as a result of mass movement and runoff. Other sediment erodes from the bottom or sides of the river. Wind can also drop sediment into the water. Hope I helped! -DorkyGeek77
Currents can erode or deposit sediment, shaping the land. They can also affect coastal ecosystems by influencing nutrient distribution and temperature. Strong currents can cause coastal erosion, while weaker currents may deposit sediment, leading to land formation.
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Earthquakes can trigger (submarine)landslides and debris flows which can act to cause the deposition of sediment, however they are far from the only cause of sediment deposition.
sediment
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Piles of sediment
Erosion
As more sediment is added, it is compressed and hardens into rock layers.
Assuming there is coolant in the engine the most likely cause is a build up of sediment behind the coolant drain or in the coolant drain tap itself.