I will reply here on the water issues.. so its all in one spot.
re-groundwater/storms: this might need tweaking. I spend some time looking up real-world climate zones so it is modeled after that. However, it might be that evaporation rate is too quick?
Maybe it shouldn't just be rain? I can adjust the evaporate rates etc. as well. What climate zones did you test and how do you think should they be adjusted?
I think evaporation is a bit high for the continental and tropical, but it may also be that these two climates don't actually get much rain compared to moderate-warm. In a map with all three, I was getting almost all the rain in moderate-warm(-cold) and a little bit of rain in tropical.. and almost nothing in Continental.
Equator, seems to be able to hold water long enough for new rain to come (granted rain is random, so its more chance)..
Note this isn't looking at much actual numbers, but rather skipping through turns and checking the weather/groundwater paged over the course of like 50-100 turns.
Optional ideas for adjustments.. Bias rain a little bit to spawn on/near farms.. (not 100% but just a little bit of bias).
Add in to farm upgrades small evaporation reductions.. For like better irrigation and such.. So farms dry out slower the higher level they are then normal places..
My drought suggestion in the other topic, could help.. Cause I think everything going to 0 instantly will take a long time for the game to correct... Compared to if a 2 turn drought drooped global ground water by 20% or something..
I am using this atm for storms:
And it seems to do ok with a equator/moderate warm-cold map.. But once a drought happens it will take a lot of turns to fix.. Perhaps 50 turns it will start to balance out(depending on how the rain spawns).. Where most farms are doing good.. Which is a bit long..
This map is about 30turns after a 2 turn drought:
The stuff below the bottom yellow line is equator, stuff in the middle is now all moderate-warm.. and the stuff not drought above the top yellow line is moderate-mean/cold and tundra .. and the drought area is desert(which is usually a dry place so not important
So moderate-warm/mean/cold.. are all recovering at an even pace..
But equator is split.. as 50% is doing well and 50% still no water...
I dropped tropical and Continental in the above map Still testing though.