"Gravity is not equal everywhere on the surface of the earth and doesn't necessarily propel downwards. . ". . .atleast thats what some physics book sed. . . . etc etc
The reason the planets formed from 'star dust' after the big bang theory is because a 'central force' started pulling dust around it which coalesced into separate planetary bodies.... that force was always towards the center.... [in our case, downwards]
So if in Ukambani the water refuses to sip or flow downwards - something is really up ... !!!