The answers to the questions are as follows: 
1)  61% percent of that water leaves the ground through evapotranspiration. 
38% percent of the water flows into the Atlantic Ocean & Gulf of Mexico.
2) South Carolina, Georgia, Alabama, Mississippi 
3) Abundance of wetlands,Frequent flooding,Difficulty navigating the state 
I hope my answer has come to your help. God bless and have a nice day ahead!