Irrigation is a terrain modification performed by a settler, worker, or engineer. Irrigated terrain usually produces more food for a city than before it was irrigated.
Mechanics 
Edit
- The irrigation order can only be given to a settler, worker, or engineer.
- The terrain to be irrigated must have one of its four sides adjacent to a water source - sea, lake, river, or another irrigated square; a city does not count unless it contains a river.
- A worked irrigated square generates one more unit of food per turn.
- A square cannot contain both irrigation and mine; building both will replace the first.
TerrainEdit
| name | result | turns |
| grassland | + 1 food | 5 |
| plains | +1 food | 5 |
| desert | +1 food | 5 |
| tundra | +1 food | 5 |
| hills | +1 food | 10 |
| forest | plains | 5 |
| jungle | grassland | 15 |
| swamp | grassland | 15 |
| glacier | N/A | N/A |
| mountains | N/A | N/A |
| ocean | N/A | N/A |
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