What is flood? How can we prevent the flood? ​

What is flood?      A flood is an overflow of water that submerges land that is usually dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide.  

How can we prevent the flood? ​   Measures might include using small barriers in ditches and fields, or notches cut into embankments, to divert the water into open land. Letting pools form outside the main channel of a river means the water is temporarily removed from the main flow - reducing the power of the floodwaters.

Explanation:

the answer is b just took the test