A-In the Hardy Cross analysis of a pipe network, what is the only restriction on the initial assumption of flow rates in each pipe of the system? B-How can aeration improve drinking water quality?What Methods are available to aerate water? Solution A) Intial assumption shall satisfy the continuity equation (Q in = Q out ) B) please use the below link for details http://water.me.vccs.edu/courses/env115/Lesson5_print.htm.