Which of the following is a consequence of altered stream velocity?

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Altered stream velocity plays a significant role in sediment transport dynamics within a river system. When the velocity of a stream changes, it directly affects the stream's ability to carry sediment, which includes both the erosion of materials from the riverbed and the deposition of sediments downstream.

Increased velocity can enhance the transport capacity, allowing a stream to carry larger and heavier sediments over greater distances. Conversely, a decrease in velocity can lead to sediment settling out of the water column, resulting in sediment buildup in certain areas. This change can disrupt the balance of sediment transport and deposition that is critical for maintaining healthy river ecosystems.

While changes in stream velocity might have effects on aquatic habitats, fish populations, and riverbank stability, these consequences are indirect and depend on a multitude of other factors. The most direct and quantifiable consequence of changes in stream velocity is indeed the change in sediment transport capacity, highlighting its primary significance in hydrology.