advantages:1.make the flood do less damage to the people
2.make full use of water,irrigate the crops
disadvantages:1.large cost
2.flood some historical places,such as Baidi Cheng
3.Millions of people move their house
advantages:1.make the flood do less damage to the people
2.make full use of water,irrigate the crops
disadvantages:1.large cost
2.flood some historical places,such as Baidi Cheng
3.Millions of people move their house