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Currently working on a sideproject using meshtastic and conventional LoraWAN:
We have dozens of smaller streams here that are somewhat flash flooding prone, often with extremely locally limited precipitation. (The last time I took damage the cell was 500m wide and the damage area was only 1.2km long. We received almost 80l/m² in one hour) This makes monitoring and warning extremely difficult and the official water level probes by the government are too far downstream and only show larger issues - for the people living on the smaller ones the damage is done - for some it might also be too late to warn them off upcoming backwater as the communication options are often difficult for them.
The idea is to use no-contact water level probes deployed to strategically useful locations and maintained by locals to monitor the level and flow of the water, transmit via conventional LoraWAN and meshtastic and inform both the local communities and official emergency response channels of the levels.
Currently still in an early stage but we are seeing more interest in that and it might end up as an official research project by a local university. (If anyone has any recommendations for cheap reliable sensors let me know...this is the current main issue - the whole node needs to be under 250€ in the end)