The figure below shows two hypothetical streams that have identical cross-sectional areas but different channel shapes.Assuming all other factors are equal,stream ________ will have the fastest flow because of the difference in ________.
A) A; width
B) A; wetted perimeter
C) B; width
D) B; wetted perimeter

Question

The figure below shows two hypothetical streams that have identical cross-sectional areas but different channel shapes.Assuming all other factors are equal,stream ________ will have the fastest flow because of the difference in ________. 
A) A; width 
B) A; wetted perimeter 
C) B; width 
D) B; wetted perimeter

Quizplus · Accepted Answer

The wetted perimeter is the length of the channel boundary that is in contact with the water. It is a major factor affecting flow resistance in a stream. A stream with a smaller wetted perimeter will have less friction and therefore flow faster. In this case, Stream B has a more efficient channel shape with a smaller wetted perimeter than Stream A, so it will have the faster flow.

The Figure Below Shows Two Hypothetical Streams That Have Identical