Which one of the following is true concerning a major river system?
A) Channel bed roughness and turbulence generally increase downstream.
B) Discharge decreases below junctions with perennial tributaries.
C) Upstream tributaries generally have higher competencies than the major river.
D) Upstream tributaries generally have lower gradients than the major river.

Question

Quizplus · Accepted Answer

Upstream tributaries often have higher competencies than the major river because they are typically steeper and can carry larger particles. This is due to the gradient being steeper in the headwaters, which provides the energy needed to transport larger sediment.

Which One of the Following Is True Concerning a Major