Correct Answer!
High velocity flow causes the bar to change because of deposition and scour of the gravel. A rock ledge outcropping is an example of a control that is not affected by high velocity flow and is therefore more stable.
High velocity flow causes the bar to change because of deposition and scour of the gravel. A rock ledge outcropping is an example of a control that is not affected by high velocity flow and is therefore more stable.