2. flooding- is caused by excessive rainfall into the seas or rivers which overflows it and then the whole area around it (low lands) are flooded.
3. it is caused by excessive rainfall and also due to poor drainage systems and many more
4. the effects are that most of the residences belonging and properties are damaged. which is hard for them to get it.
5. one of the method is dredging on rivers and seas but for the current situations it doesnt work tht much so the best method is to shift to higher grounds
for more info log on to www.en.wikipedia.org/wiki/Flood . :)