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Research · Economy

Irrigation

Channelled water off the fields — raises production further.

Entity ID
irrigation
Branch
Economy
Stat buffed
production_rate — Production rate
Bonus per level
+1.2%
Maximum level
15
Bonus at maximum level
+18%
Power per level
55
Power at maximum level
825
Base study time
25 seconds
Study time at maximum level
1h 2m
Prerequisites
Agriculture at level 8

Cost, time and bonus at every level

Irrigation runs to level 15, adding +1.2% to production_rate and 55 power each time. Studying it out costs the four soft resources — the same amount of each — and takes 1h 2m for the final level alone. Gems are only ever the optional instant finish; the study itself is bought with what your fields already make.

Irrigation: what each level costs and what it grants.
LevelTotal production ratePowerStudy timeEach resourceGems to finish instantly
1+1.2%551m 36s12,0002
2+2.4%1102m 5s15,6003
3+3.6%1652m 42s20,2803
4+4.8%2203m 31s26,3644
5+6%2754m 34s34,2735
10+12%55016m 56s127,25417
15+18%8251h 2m472,48563

Taken from nothing to level 15 that is 4h 27m of raw study and 2,007,435 of each of food, wood, stone and iron — 8,029,740 resources in total. Levels above 10 additionally consume an advanced forging material, one more unit per level past the threshold, so the last 5 levels also need the forge working.

Where it sits in the tree

Irrigation belongs to the Economy branch — the production, construction and gathering line — everything that fills the stores. It stays locked until Agriculture reaches level 8. Studying it opens 1 further tech.

Techs gated behind Irrigation.
TechBranchRequires this tech at level
Crop RotationEconomy5

The road here: Agriculture to level 8 → Irrigation. That is 1 study standing between a fresh Academy and this one.

What Irrigation costs before its own first level: the prerequisite chain, at the levels it demands.
PrerequisiteLevel requiredEach resourceStudy time
Agriculture8286,2923h 2m
Total before you may begin—286,2923h 2m

What it eventually opens: 1 study sits downstream of Irrigation, counting every remove.

Everything gated behind Irrigation, directly or at a remove.
StudySteps outBuffsAt its capStudy time at cap
Crop Rotation1production_rate+18%1h 15m

Numerically twinned with Granaries. Same cap, same rate per level, same study time, same power — the figures on those pages match these exactly. What separates them is the flavour and, more usefully, what each one gates: this one opens Crop Rotation, while Granaries opens Millwork and Animal Husbandry. If you only want the bonus, take whichever is cheaper to reach; if you are building toward something, take the one that gates it.

Guide: Research & the Academy · Research Priorities. Studied at the Maester's Academy. Index: all 81 studies · the whole database.

Rest of the Economy branch: Agriculture · Logistics · Crop Rotation · Granaries · Millwork · Quarrying · Smelting · Deep Mining · Woodcraft · Animal Husbandry · Wainwrights · Foraging Craft · Masonry · Carpentry · Stonecutting · Trade Roads · Marketry · Granary Networks · Harbour Works · Great Works

Every figure above is generated from the shipped game code — the same constants and formulas the running game uses — and regenerated whenever the balance changes. Nothing on this page is hand-typed.

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