1. The problem statement, all variables and given/known data The speed of water flowing through the "influent" 4-inch diameter section of the piping system below is 3.0 ft/s. What is the volume flow rate of water in the piping system? Express the volume flow rate in [itex]ft^3/s[/itex] 2. Relevant equations 3. The attempt at a solution I really don't know what to do. I know pi*r^2 comes into play here, but I need help. Just tell me how to start and guide me through it please.