Which statement about armored spillways is true?

Which statement about armored spillways is true?

• A. To dissipate energy at the outlet.
• B. To safely convey excess stormwater flow while preventing erosion.
• C. To primarily function as a water treatment device.
• D. To permanently store water during droughts.

Answer: (B)

Armored spillways are built to carry excess stormwater safely while protecting the structure and downstream channels from erosion. The rock or concrete armor reinforces the spillway surface so high-velocity flow doesn’t scour the outlet or surrounding ground, keeping the outlet stable during large storms. While energy dissipation can be part of the design, the main purpose is to convey flows without erosion and downstream damage. They aren’t designed for water treatment or drought storage, which is why this option best matches the function.

Armored spillways are built to carry excess stormwater safely while protecting the structure and downstream channels from erosion. The rock or concrete armor reinforces the spillway surface so high-velocity flow doesn’t scour the outlet or surrounding ground, keeping the outlet stable during large storms. While energy dissipation can be part of the design, the main purpose is to convey flows without erosion and downstream damage. They aren’t designed for water treatment or drought storage, which is why this option best matches the function.