Jai Sri Ganesha,
Know it to recall the truth,
Landsliding is caused due to deforestation,
Landsliding adds extra silt or earth content that fills the running basin of the river hence inviting floods,
Flash flood is mostly caused due to indifferent conditioning to the state of the environment in the name of developments by blocking the flow of rivers and creating heavy dams, and by creating heavy structures in hilly regions,
May Lord Bless all,
Thanks, please