One of the main reasons you have a sump is to help eliminate floods.
Your sump has to be big enough to be able to absorb the excess water in the system when the power goes off.
The amount of water to be absorbed is the excess water in the water level above the overflow and the water in the lines to and from the sump. The tank can also syphon down to the level of the inlet nozzle you can help offset the amount of syphon water by having a small hole in the nozzle that will allow air into the nozzle line to break the syphon. You have check the system from time to time to ensure that the sump is still able to absorb the excess water without overflowing into a flooded room. Both the nozzle and the air hole have a tendency to clog with algae over a period of time.
Tom R
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