Which of the following is a method used in flood control projects?

Artificial levees play a crucial role in flood control projects by serving as man-made structures designed to raise the height of riverbanks. They are built alongside rivers or flood-prone areas to contain and redirect floodwaters, thereby protecting adjacent lands and communities from inundation. By preventing water from spilling into surrounding areas during heavy rainfall or snowmelt, artificial levees effectively help manage and mitigate flood risks.

While natural levees created by sediment deposition during flood events can also contribute to controlling floods, they are not constructed for that specific purpose and are less reliable compared to the engineered solution that artificial levees provide. Deltas and alluvial fans, on the other hand, are landforms created through natural processes of sediment deposition over time and do not serve as immediate flood control methods within the scope of traditional flood management strategies. Therefore, the emphasis on artificial levees highlights their intentional design and functionality in managing floodwater.