How does deforestation lead to frequent floods and droughts?

Deforestation will reduce the water holding capacity of the soil due to lack of trees. This reduces infiltration of water into the ground which increase the chances of flood. Cutting of trees leads to accumulation of Carbon-di- oxide in the atmosphere. CO₂ traps heat rays from sun which are reflected by earth. This results in increase of temperature on earth. Increase in temperature disturbs water cycle which causes draughts and floods.