Which of the following is a concern when using hard armoring on hillsides?

Which of the following is a concern when using hard armoring on hillsides?

• A. Are animals borrowing in it?
• B. Is sediment accumulating on rocks?
• C. Is the rock being undercut or collapsing?
• D. All of the above.

Answer: (D)

Hard armoring on hillsides is meant to protect the slope from erosion and keep soil in place by providing a durable shield against surface water and runoff. But this protection comes with several potential issues that must be considered during design and maintenance. Animals can burrow beneath or through armor, creating voids that weaken the grip of the material on the slope and can lead to movement or piping. Sediment can accumulate on and between armor units, reducing their effectiveness and altering drainage, which can promote localized instability. Water flow can also undercut the base of the armor or cause blocks to loosen and collapse if the installation is not properly protected at the toe or anchored. Because each of these scenarios can compromise performance, all of the above are valid concerns when using hard armoring on hillsides.

Hard armoring on hillsides is meant to protect the slope from erosion and keep soil in place by providing a durable shield against surface water and runoff. But this protection comes with several potential issues that must be considered during design and maintenance. Animals can burrow beneath or through armor, creating voids that weaken the grip of the material on the slope and can lead to movement or piping. Sediment can accumulate on and between armor units, reducing their effectiveness and altering drainage, which can promote localized instability. Water flow can also undercut the base of the armor or cause blocks to loosen and collapse if the installation is not properly protected at the toe or anchored. Because each of these scenarios can compromise performance, all of the above are valid concerns when using hard armoring on hillsides.