Termae irrigation fertility
This mod is meant to supplement the fertility water building from: The_Yogi.
Love the mod, but I felt that the Romans weren’t quite there, so I added a +1 fertility to thermae (yes, tier 4). This way you will be able to reach a total of +5, restoring your base fertilty (actually adding +1, since after some time after the death of Attila climate goes back to -4).
Let me know if you want a comprehensive versions of the two mods.
Please check out my other fertility mod:
https://steamcommunity.com/sharedfiles/filedetails/?id=3311479435