- Excessive rainfall in river catchments or concentration of runoff from the tributaries and river carrying flows in excess of their capacities.
- Backing water in tributaries at their confluence with the main river.
- Synchronization of flood peaks in the main rivers or their tributaries.
- Intense rainfall when river is flowing full.
- Poor natural drainage system.
- Landslides 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/>
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leading to obstruction of flow and change in the river course.
Cyclone and very intense rainfall when the EL Nino effect is on a decline.