How much damage did the flood cause?
The passage does not specifically mention the exact damage caused by the flood, but based on the context of natural disasters, you might expect damage to infrastructure, homes, and agriculture.
Questions:

The cyclone has hit the northern region.

This statement likely refers to a severe storm that has impacted the northern region. It could cause damage to buildings, roads, and power lines, along with flooding and disruption.

The heat wave has affected the elderly most.

Heat waves often cause the most harm to vulnerable groups such as the elderly, who may be more susceptible to heatstroke, dehydration, and other heat-related health issues.

The landslide traveled 100 kilometers inland.

This statement indicates that the landslide moved a significant distance inland, which suggests it was quite large and powerful. It likely caused severe damage to the land, infrastructure, and potentially caused injuries or fatalities.