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I have see a few observatories mounted on top of concrete roof slabs and the owners get great results both visual and photographic. If your water tank is solid and has a good reinforced concrete slab top I am sure you will find the vibration negligable as well as air turbulance.
I see many comments from people decrying vibration and air turbulance when in fact they have not taken other steps to reduce these problems. The biggest cause of these problems is usally the actual telescope mounting and the most common is overloading the mount.
These days of excellent guiding facilities and multiple exposure stacking can remove these problems entirely. When guiding from a separate guide scope the slow flexure type movement is a far bigger problem.
I say go ahead with your planned observatory. It will be a much envied structure by fellow astronomers. I would also suggest using a dome of the Sirius type. The long term practicality will be worth the extra cost.
Barry
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