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Yes. I already had two level sensors in the overflow box. One for emergency (high line) and one for dry (low line).
The "high" opens a second (un-valved) path in the main drain. Still working up the stability analysis on this due to the time delay.
The "low" turns off the surge and skimmer pump.
The main pump (6000 gph) should generate a 0.5" over the box lip with the 2" main drain gate valve turned down a little.
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