Ur - Urina - Urbe - Urbar etc...

Hello, it's my first post on this board, although I'm "monitoring" it
for years. I'm not a linguist just an aficionado and perhaps some of
my thoughts will bother or make you laugh, so, please be nice to me
and forgive my sins.

Ok, what makes me post is the word/stem UR. You surely know words
like summerian "UR" (city, the city of UR was between the Tigris and
Euphrates I think), latin "URINA" (water-urine), basque "UR" (water -
water related), IE *UR (to weaten?), german "URBAR" (adjective
describing a piece of land that is suitable for agriculture, "UR-"
water?, "BAR" without?) and again latin "URBE" (city, Rome was
founded in a swamp area). (I've also read that "UR" in Madagascar
means rain, but I can't verify this. There is also the german
particle "UR-" meaning "very old", but I think that this has nothing
to do with the "water" UR. Old as water?)

Well, is there any possibility that these words are related to each
other? Or am I fantasizing?

PS: excuse my poor english.

Greets Jorge