Even if the water is helpful to the human a. It has blamed several together, for example.
1. In flood season, flooding the fields, community, streets and houses damaged frequently.
2. Water is also the vehicles bring various diseases such as cholera (Cholera) typhoid fever (typhoid fever) Typhoid fever artificial (Para - typhoid fever) dysentery. (Dysentery) and diarrhea (Diarrhia), etc., which we call these diseases. Disease caused by water as a medium.