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Landslides in Colombia and their impact on towns and cities - Coggle…
Landslides in Colombia and their impact on towns and cities
Causes of landslides in Colombia
Naturals:
Mountainous topography
Heavy rainfall
Fractured boulder
Seismic activity
Anthropic:
Rural-urban migration
Construction of housing on medium and high slopes.
Deforestation
Poor urban planning
defective infrastructure
Causes in some cities
Urban growth on mountain slopes with colluvium and alluvial deposits.
Excavations and unstable fills.
Mining activity in peri-urban areas.
BOGOTÁ
MEDELLÍN - Villatina, 1987
Water seepage from an artificial channel.
Highly weathered coarse residual soils.
Construction on unstable slopes.
MANIZALES - La Sultana, 2003
Intense rainfall (record rainfall in 24 h since 1970).
Poorly consolidated volcanic ash soils.
Increased pore pressure due to water infiltration.
Consequences of landslides in Colombia
Loss of human lives. 2. Destruction of housing and infrastructure.
Isolating communities.
Economy impacts
Environmental damages.
Mitigation and reconstruction costs.
Humanitarian emergencies
Consequences of landslides in some cities
BOGOTÁ
Risk for settlements in high slope areas.
It was identified that 11% of the mountainous area is in high-risk zones.
MEDELLÍN - Villatina, 1987
500 people killed.
120 houses destroyed and 1300 people affected
MANIZALES - La Sultana, 2003
16 people dead.
8 houses destroyed and 46 affected.
More than 200 landslides reported in 2003 alone.