Roads turned to murky brown rivers, homes were swept away by strong currents and bodies were pulled from mud during deadly flash floods and landslides after torrential rains hit West Sumatra in early March, marking one of the latest deadly natural disasters in Indonesia.
A 2017 study reported that forest conversion and deforestation expose bare soil to rainfall, causing soil erosion. Frequent harvesting activities — such as done on palm oil plantations — and the removal of ground vegetation lead to further soil compaction, causing rain to run off the surface instead of entering groundwater reservoirs. Downstream erosion also increases sediment in rivers, making them shallower and increasing flood risks, according to the research.
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