CE 473/573 Groundwater Fall 2008 Comments on homework 3 16. No major problems. 18. No major problems. 19. A few groups said that doubling K or ∆h would double the total volume out even though the volume did not double in the simulation. Which two principles should you have used to examine this problem? Also, be sure to explain your answers fully. 20. A few groups simply inserted the recharge. I wanted you to show me how it enters the mass balance. 22. Most groups solved this problem correctly.