I think that all that counts is the drain hose that came with the washing machine has to be able to reach, and where it fits into the drain pipe does not fit tightly. That is, the drain has to gravity feed from that point without a vacuum developing.
Specifically you may not splice an "extension drain hose" to the washing machine as the built in pump will get overloaded.
The flood level would be the rim of the tub for a top loading machine or near the bottom of the door (where water would flow out if the door were open) for a side loading machine.