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Early irrigation involved digging channels through the earth to direct water from rivers onto farmland.
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To start, Irrigation should require mining.
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For the ancient era techs, I think we'd do well with Pottery, Sailing, Animal Husbandry, Astrology, Irrigation, Writing, Archery, Masonry, Bronze Working and the Wheel as we currently have but I'd make some changes to how the techs work and what they unlock. I'll start by outlining what I think would be better. The tech and civics trees are linked pretty heavily and as I thought about it, it seemed that the solution might be to link them even further. I wanted to tackle the problems I have with the early tech tree and it got pretty messy quickly.
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