This mod adds some very simple moats to the game.
I have no idea where the water comes from, nor can I explain why all sentient life has become inexplicably hydrophobic... But hey, at least you now have additional options for routing colonists and raiders alike!
Features:
Slow to build
Costs no resources
Indestructible
Impassible
Provides no cover
Doesn't block light or support roofs
Known issues
Can't make wide moats or ponds: The tiling of the texture gets messed up if I enable corner-filling
The texture links with sandbags: I had to pick one of the existing link types, and the sandbag is pretty much the only one that won't go linking with rocks & walls.
The texture is a placeholder. If anyone is willing to make a better one, I'll be happy to include it in this mod.