Discussion
In a watershed the dominancy of overland flow/runoff is identified by the parameter?
Answer: A
The dominance of overland flow is identified by the drainage density.
Drainage density is the total length of streams divided by the watershed area. It controls how far water must travel over the ground before it meets a channel: the length of overland flow is roughly half the reciprocal of drainage density. A low drainage density means long overland flow paths, so overland flow dominates the runoff; a high density means water reaches channels quickly.
Stream order and stream length describe the channel network itself, and the bifurcation ratio describes its branching. None of them alone tells how much of the watershed's runoff travels as overland flow.
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