1. What causes a perched water table? 2. Describe several ways in which groundwater can become contaminated. 3. What is the water table? Is it a fixed position? 4. What controls the velocity of groundwater flow? 5. What happens to the water table near a pumped well? 6. How does a confined aquifer differ from an unconfined aquifer? 7. What is porosity? 8. What is permeability? 9. What is transmissivity? 10. What is the subsurface zone in which all the rock openings are filled with water called? 11. What determines how quickly groundwater flows? 12. What is the drop in the water table around a pumped well called? 13. Which direction does groundwater flow and how is it determined?.