No joke… Fellow Star Wars nerds (like myself) recognize the Death Star as an awesome symbol of the crookedness and brutality of the Galactic Empire. That statement kind of goes without saying since it’s called the DEATH Star, but as Esther Inglis-Arkell from io9 points out, it’s also an “absolute miracle of plumbing,” architectural design and engineering. The point of reference to that claim lies in imagining just how much tubing is required and the possible number and sizes of the water tanks necessary to maintain the water pressure for a small moon. You could also ask yourself, since the Death Star is a VERY LARGE space station, how its artificial gravity is set up; I’m in the group of fans that believe that — similar to Earth — the artificial gravity on the Death Star goes top to bottom, pulling you towards the center of the ship. If that is the case, you’d need either one huge water tank at the top, with numerous smaller water tanks at regular intervals over the ship’s entire surface.
Of course, all of this is pure theory as I don’t believe that there’s a clear-cut answer given, but then another thought about the proposed artificial gravity would only be ONE kind of gravity that the Death Star’s designers, engineers and inhabitants would have to deal with. Remember, this is a MOVING spaceship that travels to many parts of the galaxy, so when it would get close to other planets (say, Alderaan….) and when it orbits them (say, to blow them up….), wouldn’t THAT planet’s gravitational pull potentially screw up the Death Star’s plumbing? I don’t know, maybe I’m looking too far into this….
Also consider what happens when the Death Star moves. Twirl a bucket of water in a circle and see what happens. The phenomenon happens in our own veins — pilots black out in accelerators because the blood drains away from the front of their body. The same thing will happen when the Death Star accelerates. Unless there is an incredibly strong pump that can keep the water moving through the ship despite the motion of the ship, all the water will “pile up” on one side.
However, I must say that the architect wasn’t thinking TOO clearly about safety and security regulations in the Death Star’s design. Think about it, there’s that hole that leads straight into the most vulnerable part of the ship AND that the huge laser beam that travels through the ship first — on the way to destroy Alderaan — has a maintenance area with ZERO railing to protect the technicians. Thank you Family Guy for pointing that out to a wider audience.