Air And Water Pollution Control (AWPC) Exam 2 Practice

What is a J-hook vane in stream stabilization?

A measure to measure water velocity A dam used to block fish passage An underwater valve for irrigation In-stream rock or log structures designed to stabilize streambanks by deflecting high-velocity flow away from the bank toward the channel center

Correct Answer:

In-stream rock or log structures designed to stabilize streambanks by deflecting high-velocity flow away from the bank toward the channel center

Explanation:

A J-hook vane is a type of in-stream stabilization structure. It’s a rock or log vane installed at the bank toe that projects into the flow with a J-shaped downstream end. Its main function is to deflect high-velocity flow away from the bank and toward the channel center, which reduces bank shear and erosion right at the bank edge. The hooked downstream end helps anchor the structure and resist scour, keeping it in place during floods. This reshapes the local flow so sediment is less likely to be eroded from the bank and the channel remains more stable over time. This differs from devices that simply measure velocity, from barriers that block fish passage, or from valves used for irrigation.

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