Final answer:
The turbulence of water increases with its velocity, which affects the water's ability to erode and move materials.
Step-by-step explanation:
The turbulence of water increases as the water's velocity increases. This increase in velocity, especially at high speeds, leads to the drag between adjacent layers of fluid and between the fluid and its surroundings to form swirls and eddies, causing turbulence.
In a river or stream, as the flow rate increases, the water's capacity to erode and transport materials also increases, shaping the riverbanks and moving sediments and nutrients along the course of the river.