Few different flood stories. On vacation last year, (still haven't figured out how yet) Two pipes come apart onmy return very bad very messy. A month ago the back siphon from my RDSB filled my sump during a power outage. When power returned the overflow from my rdsb didn't drain fast enough had a small flood to the tune of about 7 gallons. These were the two I have had in about 6 years. Nothing I couldnt fix.