FLOOD

 

Natural disasters are increasing all over the world day by day. One of it is flood. The death rate of people is increasing annually more than from other natural disasters. It is higher than 20,000. 75 millions of population suffer from the flood annually in the world. The flood prevails slowly or fast. It may prevail for many days or weeks. As an example , main roads of Kudaligama and Naboda and Suburbs can be taken. In those areas , the flood has lasted about 11 days.

Actually , the flood , is weather disaster. The secondary effect of the flood is rain , wasuli , or rainstorm. Further because of the flood , landslide , river bank eruptions , breaking of the dams and the spread of epidemic diseases may spread. Also many other disasters may happen . There fore the flood can be taken as a natural disaster.

Generally thee flood can be happen in two ways. It flash flood and regional flood. Flash flood happens because of lightening storms, and Regional flood happens over flowing of river Droni.

There are factors of creating the flood. They are the human factors and the physical factors. 

                                    HUMAN FCTORS ARE AS FOLLOWS

 

1- Bank cutting 

2- Sand mining 

3- Disposal of waste into rivers

4- Blocking natural water ways

5- Filling low lands 

The physical factors are as follows. 

1- Changing the ways of flowing water of rivers.

2- Heavy rain 

3- Land slide

4- Blocking rivers

5- Tide opportunity ect. 

So those above factors, effect to the human environment and the physical environment. 

THE EFFECT TO THE PHYSICAL ENVIRONMENT 

1- Changing the ways of flowing water 

2- Breaking up the walls of river banks 

3- Slit and debris set down on the surface of the earth

4- Soil Erosion