Hm, aqueducts are new to me.
Of note:
- Aqueducts will have their walls extend up, but this is only on the sides - the surface of River tiles will be at z-level above, though. Both override native trees. Also: The tree area is
, contrary to the green grass.
If you start with entire river being an aqueduct, it will be unrevealed as well, and that area will not have wild animals (probably due aboveground biomes not having any underground creatures) or visitors enter the map, even after you block all map edges elsewhere and discover the caverns and wall that off too, though it will become eligible area for cavern plants.
- The river elevation is determined at embark tile level, here.
- The aqueduct wall material is picked based on biome. While lower levels have sand and fire clay, this upper air biome of tundra (
poor alligators)has clay loam. No vegetation on these edge tiles, which is kind of odd, but could provide access to plants otherwise not present.
Surface stone pebbles extend into aqueducts as natural stone walls of that material, but such randomness is not given to air biomes. Still, could be your only source of flux on map.
- Impractical, but pretty(
large image). However, the hole was supposed to be at where rivers join, not in the corners of 4 tiles. Well, that's DF.
- Even with just aqueducts, layout of trees and and pools will change (minerals will remain the same, though).
Toying a pit more,
- with cavern-level pits the reverse of first occurs - fungiwood growing on "aboveground surfaces". Looking at deeeep river, first time seeing this symbol and colour being used:
(2z above Semi-molten rock wall with no floor above)
- It apparently can mess with minerals - lost magnetite on a tile that previously had it by increasing region elevation.
- First time seeing tunnel tube roots.
The tunnel tube is entirely inside/dark/subterranean, but the Sandy Loam area spread from adjacent biome.
- it seems it picks the width of south/east entrance of river by the north/west width of river.
- If you create a gorge ending right above caverns, the lack of floor beneath tree trunks may reveal them - without even cutting them down. Doesn't seem to apply to all trees, though.
I imagine many of these things were discovered by others when testing, but didn't see anybody posting them.