Flood

There are many place where people need to be concerned about flood. Flood causes big damage of building and cities, but it also benefit for people and agriculture. A flood occurs when water overflows or inundates land that's normally dry. This can happen in a multitude of ways. Most common is when rivers or streams overflow their banks. Excessive rain, a ruptured dam, rapid ice melting in the mountains  are also impetus for flood. Moving water has awesome destructive power. When a river overflows its bank,  Bridges, houses, trees, and cars can be picked up and carried off. The erosive force of moving water can crush the foundation of building. In 1930, the world worst flood appeared in china. Estimates of the total death range from 3.7 million to 4 million and a huge amount people was effected. Many cities was destroyed through north to south. however, flood also can benefited for agriculture. when a river overwhelm and send sands spreading the flat land, nutritious sludge are good for supporting the growth of plants. Usually, high quality agriculture appears at the place where even had a flooding.