I cannot tell you *when* it happens... but the "Zone total flow" gets erased every few months. (Maybe when updates occur?) I just know that since I have had my rainmachine I have had to re-enter total flow rates probably 4-5 times.
I do not have any sort of flow meter... I purely calculate flow based on the flow rates of the devices on the sprinkler circuit. I have scripts that keep historical data and graphs using the API. I only notice the flow rate has been erased when I go look at my graphs and notice they have stopped working.
A similar thing seems to happen with the zone area (though I do not use this). I always erase this field and it will reset to some area just under 1000sqft.
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