I'm hoping somebody can help me...

I have a client that I'm making a one-continent map for just now - in the middle of this continent is a circle of mountains,raised by a storm titan as a defensive tactic. The middle of the circle is a desert, fair enough so far. However, the titan's body is in the middle of the desert, with enough magic still attached to cause a permanent raincloud directly above. My client wants this to be the basis for a permanent settlement - would this be viable, or does the water all turn stagnant with nowhere to drain to? I think a solution is to have the body plus raincloud in the mountains, with a river flowing into the desert - what's everyone's opinions?