Which statement about gabions is true?

Which statement about gabions is true?

• A. They are plastic baskets filled with water
• B. They are wooden frames filled with moss
• C. They are steel mesh cages filled with small rocks
• D. They are inflatable bags used for temporary dams

Answer: (C)

Gabions are sturdy, permeable structures made from steel mesh cages that are filled with small rocks. The steel mesh forms a basket or cage that holds the rock in place while allowing water to pass through, which helps dissipate energy and reduce erosion along slopes and riverbanks. They can be galvanized or coated to resist corrosion and come as various shapes—baskets, mattresses, or wall sections—stacked to create stabilization structures. This description matches their purpose in erosion control, unlike options that describe water-filled plastic baskets, wooden frames with moss, or inflatable bags used for temporary dams.

Gabions are sturdy, permeable structures made from steel mesh cages that are filled with small rocks. The steel mesh forms a basket or cage that holds the rock in place while allowing water to pass through, which helps dissipate energy and reduce erosion along slopes and riverbanks. They can be galvanized or coated to resist corrosion and come as various shapes—baskets, mattresses, or wall sections—stacked to create stabilization structures. This description matches their purpose in erosion control, unlike options that describe water-filled plastic baskets, wooden frames with moss, or inflatable bags used for temporary dams.