بسم الله الرحمن الرحيم
(Fatwa: 991/815/D=12/1437)
It is mustahab to make wudhu while sitting on a high place so that one can avoid the splashes of water and can make wudhu comfortably. If one does wudhu while sitting on plain ground then he should avoid the splashes. But these splashes are not impure hence wudhu shall be valid.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
