Which method is NOT a way to create a sediment trap?

Creating a sediment trap involves methods that actively manage sediment to prevent erosion and control runoff. Excavation, forming embankments, and combining excavation with embankments are all intentional engineering techniques designed to direct water flow and catch sediment effectively.

Excavation involves digging into the ground to create a depression where sediment can settle out of the water. Formed embankments are raised structures that can direct water into a particular area, thereby allowing sediment to accumulate on the down-slope side. The combination of excavation and embankment utilizes both strategies to optimize the trapping of sediment in a designed location.

In contrast, natural deposition refers to a passive process where sediment settles from water flow without any immediate human intervention or engineering design. This method does not actively create a structured sediment trap, making it the correct answer to the question. The effectiveness of sediment control relies on human-engineered solutions tailored to prevent sediment loss rather than relying on natural processes, which are unpredictable and less reliable in creating intentional traps for sediment control.