Which among the following will not be a mitigation technique to manage…
2023
Which among the following will not be a mitigation technique to manage landslides?
- A.
Hazard mapping to locate areas prone to landslides
- B.
Increase in vegetation cover to arrest rocks and debris
- C.
Removal of retention walls to allow smooth exit of rocks and debris downward
- D.
Surface drainage control to check the movement of debris and rocks along with rain water and spring flows
Attempted by 220 students.
Show answer & explanation
Correct answer: C
Key point: Removing retention walls increases landslide and debris-flow risk rather than mitigating it.
Why this is harmful:
Retention or barrier walls act as physical defenses that stop or slow moving rock and debris; removing them removes that protection.
Without barriers, debris can travel farther and cause greater damage to people and infrastructure.
Any removal should only occur after an engineering assessment and only when replaced by an appropriate stabilization measure.
Effective mitigation techniques (examples):
Hazard mapping to identify and avoid or prioritize high-risk areas.
Increase vegetation cover and bioengineering to stabilize soil and reduce erosion.
Surface drainage control to divert water away from unstable slopes and reduce infiltration.
Constructing or maintaining retention/barrier walls and other engineered slope-stabilization works.
Land-use planning, early-warning systems, and community preparedness to reduce exposure and vulnerability.
Summary: Removing retention walls is not a mitigation technique; it increases hazard. Prefer mapping, vegetation, drainage control, and engineered stabilization to manage landslide risk.