කුරුණෑගල නුවර පාරේ 7km 8Km අතර සිදු වු විනාශයේ සම්පුර්ණ දර්ශන ⛈️

Landslide risk is closely linked to rainfall because water is one of the most powerful triggers of slope failure. Here’s a clear breakdown of how rain increases landslide risk:

*How Rainfall Triggers Landslides*

*1. Soil Saturation*

When it rains, water fills the pore spaces between soil particles.
As the soil becomes saturated, it becomes heavier and loses friction.
Once the soil can no longer resist gravity, a landslide can occur.

*2. Loss of Cohesion*

Water reduces the cohesive strength of clay-rich soils.
Increased pore water pressure weakens slopes, making them prone to failure.

*3. Rapid, Intense Rainfall*

Short bursts of heavy rain (e.g., thunderstorms, monsoons) can quickly overwhelm drainage.
This sudden increase in pore pressure often triggers shallow landslides.

*4. Prolonged Rainfall*

Long-term rain—even if not intense—can saturate deep layers of the soil.
This often results in larger, deeper, more destructive landslides.

*Factors That Increase Landslide Risk During Rain*

*Steep slopes*
*Loose or disturbed soil* (construction, deforestation, mining)
*Poor drainage systems*
*Earthquake-weakened slopes*
**Soil types that retain water**, like clay

*Warning Signs of Imminent Rain-Triggered Landslides*

New cracks in the ground or walls
Tilting trees, poles, or fences
Unusual sounds (cracking, rumbling)
Sudden increase in stream turbidity (muddy water)
Bulging ground at the base of a slope

*How to Reduce Landslide Risk*

Improve drainage (gutters, channels, culverts)
Avoid cutting vegetation on slopes
Reinforce slopes (retaining walls, terracing)
Monitor rainfall thresholds in high-risk areas
Follow local hazard maps or early-warning systems

If you want, I can also:
✅ Explain landslide physics more deeply
✅ Provide rainfall thresholds for landslide warnings
✅ Help assess landslide risk in a specific region (tell me where!)
Which would you like?
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