Flood 

   1. What are floods? 
        - Flood is An overflowing of a large amount of water beyond its normal confines.

   2. Why do floods occur? 

        -  Because, Flooding and flashing flooding are not restricted to specific areas of the country. Certain geographical locations may be more prone to annual flooding or a flash flood from a sudden rainfall. 

   3. What causes floods?  

      - There're so many causes of flooding e.g. Natural cause such as High rainfall , snowmelt , Relief , Coastal Flooding and Human cause such as Deforestation , Poor farming , Poor water management and Population pressure. 

   4. Where do floods occur? 

     - Flooding always occurs in coastal area. And If water level is higher than the level of the coastal lowland, flooding will occur. Or the place which near river with high rainfall and there're poor water management. 

   5. How do they affect people in communities?

     - About Economy such as Economy loss and Resources used in reconstruction , About Environment such as It damaging the farm land , damage of roads,collapse of bridges. About Human Being such as Human died & lose their homes and about Disease because many people die from disease which came with flood such as dengue fever , Cholera , Leptospirosis , etc.. 

Sources
 http://www.theweatherchannelkids.com/weather_ed/weather_encyclopedia/flooding/why_floods_occur/