I don’t believe any of the pumping station generators or motors were directly damaged by rising water during Katrina. A few stations had roof damage and many more stations were abandoned during the storm because they were considered unsafe to the operators. That was a highly controversial decision since it resulted in flooding in areas where pumps were available. I recall only one station that failed during operation and I think that was not a failure of the pump motor, but of the structure’s foundation that prevented effective pumping. In any case, pumping stations are now better armored to withstand Cat 5 storms and to allow crews to remain within the structure.
I saw one documentary where they showed the pump station where it flooded and the pumps stopped due to the flood water.