The 1 1/4" piping is connected to a foot valve that goes down around 18' into the well. The 1 1/4" connections to the pump itself are about 4' total-so I would say 22'coming from the bottom of the well to where I would like to run the 1" piping from. I haven't measured my gpm as of yet because my plumber is still completing the install on the pump itself, but it's a 1 1/2 hp pump that is supposed to be pushing descent gpm when it's all done and said. So, 1" pipe will be suffice?