Two things come to mind to sense:
- Is water accumulating in the basins (if upstream accumulation is happening, but not downstream that would show some sort of blockage)
- How much water is flowing perhaps with the level in the basins
I was thinking of using floating micro-switches and 4 lora clients, one per basin. I could also perhaps use just one and run wires (40 ft long though) Anything better than floating switches?