Disadvantage:
1.Pollution of drinking water (clean drinking water becomes scarce)
2.Structures such as buildings get damaged due to flood water.
3.Landslides.
4.People and livestock die due to drowning.It can also lead to epidemics and diseases.
5.Unhygienic conditions.Spread of water-bourne diseases.
6.Shortage of food crops can be caused due to loss of entire harvest.
7.Economic hardship,(temporary decline in tourism,rebuilding costs,food shortage leading to price increase etc)
Advantage:
Flooding can bring benefits,such as making soil more fertile and providing nutrients in which it is deficient.Periodic flooding was essential to the well-being of ancient communities along the Tigris-Euphrates Rivers,the Nile River,the Indus River,the Ganges and the Yellow River,among others.