How much of the floor is flooding?
Garage floors should be self draining, 1/8" to 1/4" Of slope per foot is typical.
This has a safety element since liquid fuel needs to drain to outside if there is a leak or a fire.
If you set a D cell battery on the floor, it should roll all the way to the garage door without giving much if any help to start.
Sometimes they make the floor level next to the house for shelves/benches but it needs to slope starting from the cars front bumper back at a minimum.
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