Which factor 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 reliably determine the depth of a debris flow because erosion can occur below the maximum flow depth due to various processes, not directly indicating the flow's depth.

Which Factor CANNOT Be Used to Determine the Depth of a Debris