Probably not, main concern would be access to coop for the keepers,Do you think the 4.5ft elevation would be too high for the chickens?
to gather eggs, clean, and examine birds off roost at night.
What is the size of the platform, in feet by feet?
How often does this flooding happen?
Oh, and... Welcome to BYC! @B-flock
Where in this world are you located?
Climate, and time of year, is almost always a factor.
Please add your general geographical location to your profile.
It's easy to do, and then it's always there!