Hi!
I’ve started voting for evaporation towers tagging. Please vote on the Wiki.
Link: https://wiki.openstreetmap.org/wiki/Proposed_features/man_made%3Devaporation_tower
Description:
man_made=evaporation_tower will replace man_made=gradution_tower (this tag had a few uses).
Additional tags
We have cooling tower, haven’t we?
There are dry and hybrid cooling towers. More accurately you want evaporative cooling,
These have evaporation itself as their only purpose. No cooling.
The purpose of these towers is merely to evaporate the salt that floats as a mist in the air, which some sources say has health benefits.
I’m hesitant to vote on this since it’s out of my wheelhouse, but I was wondering if all evaporation towers are buildings and if so why is it not a sub-tag of building=* instead of man_made=*? Or really for that matter something like man_made=tower + tower:type=evaporation?
Could the “typo” in the thread title be corrected please?
stared → started
As I mentioned now, I doubt it fits the man_made=tower definition. Plus, you will get the confusion as above concerning tower:type=cooling. There are man_made=cooling_tower and man_made=cooling, if not mentioning man_made=chiller.
I guess that makes sense. I don’t see why there would be confusion between these and a cooling tower since they are clearly different, but like I said it’s not my wheelhouse either 
Voting stopped, I will repair the issues from voting comments and start again on Proposed features/evaporation tower & brine source - OpenStreetMap Wiki