Discussion
A graph that shows the relationship between the size of sediment and the threshold flow velocity required to erode it, transport it and deposit it :
Answer: A
The graph is the Hjulstrom curve.
Filip Hjulstrom's diagram plots flow velocity against grain size and shows the velocity needed to erode, to keep in transport and to deposit particles of each size. It shows that sand of about 0.1-0.5 mm is the easiest to erode, while finer silt and clay need higher velocities because of their cohesion, even though once lifted they settle out only at very low velocities.
A flow duration curve shows how often a given discharge is exceeded, and a sediment rating curve relates sediment load to discharge. 'Trombe's curve' is not a recognised sediment diagram.
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