Paasky
Good News Everyone!
I went and got Zeb' new irrigation and the desert irrigation, but then I noticed that there wasn't any new graphics for tundra. Although tundra isn't irrigated very often, it could be a cold area, not ever-winter, in some scenarios.
The irrigations are not hand (or mouse) drawn, but copied from C&C Red Alert 2.
Here's a screenshot:
As you can see, these work better with whiter tundra.
Installation: Rightclick on Irrigation TUNDRA.pcx, Save As, and browse to your civ3\Art\Terrain folder.
To be able to irrigate on tundra, open the scenario editor, open civ3mod.bic (or conquests.biq or civ3x.bix), edit rules, terrain, tundra and change irrigation to 1.
The irrigations are not hand (or mouse) drawn, but copied from C&C Red Alert 2.
Here's a screenshot:
As you can see, these work better with whiter tundra.

Installation: Rightclick on Irrigation TUNDRA.pcx, Save As, and browse to your civ3\Art\Terrain folder.
To be able to irrigate on tundra, open the scenario editor, open civ3mod.bic (or conquests.biq or civ3x.bix), edit rules, terrain, tundra and change irrigation to 1.