Water Basins are smaller than the 16x16 tiles. I think its 4 water basins per tile.
Ah true, i got bamboozled by the change of grid ._.""
So that would mean, one would need 4x256=1024 Basins to cover the whole floor, which means it is not possible.
Is there a way to up the limit? If not I guess i would need to add this to the list of my trillion suggestions x:
But it is true that they are only placeable within the housing grid on the default earth/floor, right?