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good point... and without making the setup exceedingly complex, the really short answer is to have a solenoid on the overflow drain that fails closed.
Thus... when power is on, the WCD hardware (timers, pumps, etc) can operate as intended and the overflow drain will be open (uninterupted power keeps the solenoid on/open).
But if the power goes out... the solenoid kicks off (shuts/closes) and the sump will not lose excess water that was not part of a scheduled WC overflow.
Clear or no?
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