The ibc international building code vaguely addresses this issue.
International building code garage floor slope.
The command has been given.
Appliances located in a garage or carport shall be protected from impact by automobiles.
Appliances located in private garages shall be installed with a minimum clearance of 6 feet above the floor.
The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.
2020 colorado code consulting llc 1 2018 international residential code chapter 3 building planning.
I checked several citations of the international building code and there was language that garage floors must slope to the door so liquids drain to the door or to a drain.
If bollards or stanchions are not installed then the unit must be raised 6 feet above the garage floor per irc g2408 3 305 5.
The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.