- Lavaka meaning for hole with steep sides.
- The side of a hill is a type of erosional feature common in;
Madagascar
Democratic Republic of the Congo
South Africa
Brazil
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| Active lavaka on right, with inactive, largely infilled older lavakas to left |
- They are most abundant in the Central Highlands.
- Approximately 1m thick laterites.
- Develop on steep terrains in a monsoonal climate.
- Lavakas form hard laterites overlie thick saprolite.
- Steep 35 - 55 degree slopes.
- That areas are;
hot in dry season
warm in wet season
- Lavakas are not landslides.
- They are a type of gully.
- Formed via groundwater sapping.
- Associated erosion is usually rapid.
- Producing a sediment yield (8,000 cubic metres) over several months.
- Human activities contribute to lavaka formation such as;
-Deforestation
-Overgrazing
-Road creation
-Grassland burning
- Lavakas are caused by natural processes.
- Some lavakas are 20,000 years old.
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