Which of the following CANNOT be used to determine the depth of a debris flow in a canyon it moved through?
A) bark battered off the upstream sides of trees up to that height
B) sand embedded in bark up to that height
C) rocks lodged in tree branches up to that height
D) the maximum height of sand eroded from the valley sides
E) the highest rocks on natural levees deposited by the flow

Question

Quizplus · Accepted Answer

The maximum height of sand eroded from the valley sides cannot be used to determine the depth of a debris flow because it only tells us the height of the eroded sand, not the actual depth of the flow. The other options all provide evidence of the height the flow reached and can be used to estimate the depth of the flow.

Which of the Following CANNOT Be Used to Determine the Depth