looking for solution to overflowing my tank

kjm

Reefing newb
I am installing a sump system in my tank but my tank is not drilled so I have a overflow box. One of the things that I am tring to figure how to prevent is when I lose power I will lose my siphion and when power comes back on the pump will drain the sump into the tank and onto the floor. Does anyone have any creative solutions to this problem
 
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