Baseline height: Auto-set from the first sensor reading at installation. Represents the sensor-to-water distance when water is at its normal low level. Override if needed.

Warning level: Alert generated when water rises this many metres above baseline (e.g. 0.30 = alert at 30cm rise).

Critical level: Critical alert at this rise above baseline. Should be higher than warning. Escalation to on-call engineer.

Changes take effect on the next received packet.