This was my very first try at setting up an irrigation system since the addition of the z-levels. It's a lot more difficult now! I think I did pretty well though. It draws water from a brook, floods the overhead pipes, and then each individual farming room can be flooded with what's in the pipes. After that, you pull another lever to open the drainage hatch, and it's all let out into a series of pipes beneath the farms that lead to a cistern where the water is held until it evaporates. It also connects to my emergency overflow prevention system, which consists of some iron grates that drain into the cistern in case of any water escaping the farms.
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