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43.4 psi, both are the same since the water level is @100 pipe size has no bearing on the psi unless there is something to change it such as a pump. Mark
On Sat, May 17, 2008 at 4:47 PM, Bill Dowden wrote: > Pretend that there is a watertower in this widdie bittie town. The > tank is full and the water level is exactly 100 feet above ground > level. There are two pipes running down to the ground from the water > tower: there is a 10 inch pipe running straight down out of the > bottom of the tank = 75 feet above ground level, and there is a 1/2″ > pipe running down from the side of the tank at 85 feet above ground level. > > At 3am, when everyone in this widdie bittie town is sound asleep and > there is no water running in or out of the tank, what is the relative > difference in the water pressure at each pipe at the ground? Which > one has a higher or lower pressure and why? And, what is the pressure > in each pipe at ground level - in feet and PSI? > > > > Bill > >

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