Hi folks

As Timberborn got a full 3D terrain with Update 7, you can use tunnels for underground irrigation now. You just have to make sure, that the water inside the tunnel is completely full, so it reaches the ceiling of the tunnel. Platforms inside these tunnels don't matter, as they are water permeable.

Now you don't have to rely on open channels or channels hidden below roads or buildings anymore. This means, you can use the space these channels needed for plantations instead. That way you can also prevent these areas being flooded accidentially by these open channels too.

Evaporation still happens underground, just think of it as water seeping away into the ground instead.

Here are some screenshots of waterbodies below one block of ground to show how they affect irrigation on top. These are animated gif-files which will loop showing the surface, as also the first and second level below surface.


As water physics in Timberborn allows the principle of "communicating vessels[en.wikipedia.org]" you can easily make sure these tunnels are filled, by supplying water from of a river or a lake at ground level or higher. You could even underpass valleys or rivers if needed.

If you want to add "service entrances" for further construction or you want to feed additional open waterbodies by your irrigation tunnels, make sure to use sluices at the correct depth when the water source is higher so you don't loose water by overflow.

If there is danger of bad water flowing inside your irrigation system, use sluices to prevent this, as water pollution can reduce the irrigation effect or even poison your plants. It could be hard to replace polluted water with fresh one.

Have fun with beavers hydraulic engineering. ;-)