Landslide Prevention and Mitigation

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Questions and Answers

What is one of the primary methods for preventing landslides mentioned?

Utilizing susceptibility maps (correct)

Evacuating all residents

Increasing vegetation cover

Constructing more buildings

Which factor is NOT likely to cause a landslide?

Stabilizing vegetation (correct)

Steepening the slope

Heavy rainfall

Removing top material

How can adding weight to the bottom of a slope help prevent landslides?

It promotes faster erosion

It decreases soil moisture

It encourages vegetation growth

It increases friction and resistance (correct)

Which condition makes slides more likely to develop?

Steep slopes with loose debris Signup and view all the answers

What materials are sometimes used to restrict water and slow down weathering?

Sbotcrete Signup and view all the answers

What indicates that an area may be prone to landslides?

Cracking or wavy pavement on roads Signup and view all the answers

Which engineering solution can help mitigate the effects of landslides?

Piling heavy boulders on toes of slopes Signup and view all the answers

What role does vegetation play in slope stability?

Reduces soil erosion Signup and view all the answers

What is one method mentioned for strengthening soil and preventing landslides?

Removing water from the soil Signup and view all the answers

Which of the following is a warning sign that a landslide may occur?

New cracks in pavement Signup and view all the answers

What structural observation might indicate an imminent landslide?

Doors and windows that are out of plumb Signup and view all the answers

Which of the following actions can be taken to assess landslide risk before construction?

Consult local authorities about past landslide events Signup and view all the answers

What is a recommended artificial method to help drain water from slopes?

Inserting perforated pipes Signup and view all the answers

Which sign is NOT indicative of an impending landslide?

Completely stable utility lines Signup and view all the answers

What is the primary purpose of soil nails in landslide prevention?

To stabilize the slope Signup and view all the answers

Which of the following is an incorrect statement regarding landslide preparedness?

Relying solely on aesthetics can improve landslide preparedness. Signup and view all the answers

What is a recommended practice for household utility installation to minimize breakage?

Employ flexible pipe fittings Signup and view all the answers

What is a precaution someone should take during long periods of heavy rainfall?

Be wary of intense short bursts of rain Signup and view all the answers

What should you observe as a sign of possible incoming landslide activity?

Water flow changes from clear to muddy Signup and view all the answers

What action should be taken immediately if authorities declare an evacuation due to potential landslides?

Evacuate immediately Signup and view all the answers

Which structure might be useful to divert debris flow during a landslide?

Deflection walls Signup and view all the answers

After a landslide occurs, what is important to do regarding safety?

Stay away from the landslide area Signup and view all the answers

What should you listen for that indicates landslide danger?

Cracking sounds from nearby trees or boulders Signup and view all the answers

What community support should you provide after a landslide as a trained emergency responder?

Assist individuals with special needs or disabilities Signup and view all the answers

Study Notes

Landslide Prevention

Ground assessment: Before buying property, check for historical landslide events in the area. Contact authorities like the Mines and Geosciences Bureau or Department of Environment and Natural Resources for advice and corrective measures.
Susceptibility maps: Use maps provided by MGB to avoid building in high-risk areas like steep slopes, areas with loose debris or fine-grained soil, and locations of previous landslides.
Vegetation: Ensure slopes have vegetation to hold surface material in place.
Shallow slides: These occur more frequently on slopes with minimal vegetation and lack of trees.
Relocation/Evacuation: Consider relocating structures identified as unsafe due to landslide risk.

Landslide Mitigation

Buttressing: Add weight to the lower part of a slope with heavy structures to resist movement.
Boulders: Piling boulders on the toe area can stabilize a slope.
Slope angle: Lowering the slope angle lessens the risk of movement.
Shotcrete: This cement mixture is used to restrict water and slow down weathering.
Rock net/fence/ditch: These features can prevent falling rocks from impacting buildings or roads.

Landslide Warning Signs

Dry lands: Observe the appearance of springs, seeps, or saturated grounds.
Pavements & Sidewalks: Look for new cracks or unusual bulges and depressions in the road beds.
Utilities: Be wary of leaning telephone lines, poles, retaining walls, fences, and broken water lines.
Doors/Windows: Check if frames are out of plumb.
Sound: Listen for unusual sounds like cracking wood from trees, or faint sounds of rock rolling that increases in intensity.

Landslide Safety Measures

Rainfall: After prolonged heavy rain, be extra cautious during intense short bursts of rain.
Radio/TV: Stay informed about rainfall warnings through radio or televisions.
Evacuation: Obey early evacuation notices announced by authorities.
Debris flow: Stay out of the path of landslides or debris flow.
Mudflow: Be aware of small mud flows or trickles, as they signal a larger potential mudflow.
Stream/Channel: Watch for sudden changes in water flow and muddy water, indicating a possible upstream landslide.

After a Landslide

Stay away: Avoid areas where landslides occurred as there might be a risk of additional slides.
Emergency broadcasts: Listen to information about landslides and related flooding.
Emergency response: If trained, provide help to those in need.
PWVD: Look out for the needs of elderly people or persons with disabilities who might need special assistance.

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Description

Test your knowledge on the various strategies for preventing and mitigating landslide risks. This quiz covers essential practices such as ground assessment, the importance of vegetation, and engineering solutions like buttressing and stabilization techniques. Learn how to protect properties and ensure safety in landslide-prone areas.