when obi-wan cut Darth maul in half i looked at his profile on wookiepedia and all it says is he survived and i want to know how?

i believe he got cut from the waist down.. that would mean no vital organs where lost(other than reproductive)

Yes of course. Humanoids definitely do not require their diaphragm, ending of the stomach, lower part of the pancreas, the kidneys, the small/large intestines, and both thigh pulmonary arteries to live. 0f course they do not.
Now, rather than use sarcasm again, let us be smart. The waist is an important part of the body. Hugely. With many vital parts. Do not be an idiot.

ya butt theirs a giant pit that he fell down, butt they also have very advanced medical technology.

He could have sustained more injury in the fall. He would lose lots of blood, lots. He cannot crawl well, and no one would be near to help. He is far away from medical facilities. All reasons that point to imminent, if not already, death.

This is one bit of EU that I personally don't believe. The fall alone, the depth of the pit itself, doesn't make any sense he could've survived. On top of that, even if he got out, he can't honestly just waltz into the theed hangar, steal an N-1 starfighter, and leave the place. No, I think he died then and there, no way he could survive. Besides, Sidious doesn't want him anymore, he wanted Luke, in order to replace Vader.

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I will always be the dark side. There will always be an empire, so long as the sith never die...

It's non-canon as it comes from a comicbook series that is non-canon. They are called "Infinities," if I remember correctly, and each of them is a "what if" scenario.

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Oh I see now. Thanks for telling me about the comics.

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I will always be the dark side. There will always be an empire, so long as the sith never die...

i don't see how he can survive either. he got cut in half, it just doen't make sense. obi wan would have killed him again.

He survived because he fell of a tall ledge.

It's a law of physics: fictional characters CAN NOT die at the same time they fall off a tall ledge. Tall ledges also have healing powers that fix all wounds.

Anyone who falls off a tall ledge (especially into water, though Maul did not and it is not necessary) is destined to come back later on fully healed and suprise everyone.