Advance
Inter-Valley Irrigation
By building extensive networks of canals and connecting the waterways of our homeland's valleys, we can greatly improve our irrigation techniques and the productivity of our farmlands.
Advance tree
It has no requires, so the game files don’t say where this goes. When the game builds the 
Traditions tree, it adds this at the end of a branch with room for it, in the same spot in every campaign.
- Inter-Valley Irrigation
Relocating Artisans then 2 more
Terrace Farming then 4 more
Belongs to 1
- TraditionsAge
Required by 2
- Relocating ArtisansTraditionsRequires
- Terrace FarmingTraditionsRequires
Scripting 2
Uses 1
References 1
- monthly_food_productivity_mild_bonusModifiers
depth = 0
starting_technology_level = 4