Github Link
This isn’t an xdotools solution, but a series of scripts and configs added to the River Wey Trust AR Sandbox implementation. Hopefully help if you’ve not already solved the problem.

The Trust’s version of the SARndbox has a number of ‘added features’ culled from trawling the original forum, and with some home written scripting and configs. Perhaps not always elegant, and probably inefficient for those more skilled in Linux etc… but for the sake of sharing and supporting Oliver Kraylos’ stunning generous gift of the original code and concept, these notes describe what we currently have.

Hi – if it helps there are a few outline ideas atRiver Wey Trust lesson plans which I use in school visits.
In terms of your trees – if you introduce some model trees (or buildings.. or any model / element which impacts the elevation) the water will react and “gather” around this “blockage” and represent a level of water retention – had fun with this at a regenerative farming conference, happily introducing hedges to the landscape.

Also use a range of fluid effects/colours with varying attenuation to discuss water/lava/snow/ice/oil.

if you can use a location feature local to the audience and model it simply, then they will often run with the ideas and change impacts with little prompting.

Still having fun in schools !

Alistair