Reply To: Hydros 21 Depth/Conductivity During low temps

I wonder what the water temperature is, or if there are water temperature changes, when this is happening.

From the graph it reads the water level is at 20″ depth then on the 10th Feb it drops by up to 5″ for some  time (hours?) before recovering, with 3 other similar but not us pronounced events

IF any for of ice could build up in a pressure sensor it could change the readings, however at a water depth of 20″ that seems unlikely. As we know water is at its most dense at 4C, and ice forming at ~0C floats. It could be due to the hydrology that the water swirls and causes temperature fluctuations on the sensor – that’s why it would be interesting to have a reference to the sites, or have the temperature graph.

If there is a layer of ice, which you indicate there isn’t,  and the water drops underneath the ice, the pressure on the sensor would change, which would indicate a real depth change.

Any temperature changes maybe key to artifacts in water depth readings – https://www.envirodiy.org/topic/artifactual-troughs-and-flickers-in-recorded-stream-depth/