Evidence of the flood I propose would be nearly entirely degraded in the years since.
And what IS this evidence?
The flood I propose killed every human except those on the ark.
Ah, the 'loving God' gambit...
Those few not drowned outright soon died of starvation and exposure.
So this is what you were talking about...
So... 4 breeding pairs on the ark - 8 people. 5 of whom were close relatives, and 1 pair of which did not contribute to the post-flood re-population extravaganza. So, all 7 billion people alive today are direct descendants of these 3 breeding pairs (and by extension, Noah).
There is no reason to believe that these breeding pairs were not all from the same region, and thus all of the same 'ethnicity' - especially given the fact that Noah was in only the 10th generation of all humans!
So, we have a rather homogeneous gene pool from which to produce all extant variations - to paraphrase our old non-biologist pal Justatruthseeker - Asians, Africans, and every other distinct 'race' of humans, all from 3 related and homogenous breeding pairs.
Let's see your population genetics model that can account for this.
I am especially curious to see how you will account for, for example, the alleles associated just with ABO blood groups.
And then, of course, things are much worse for the 'unclean' animals, genetically speaking - a single breeding pair. Elephants are apparently unclean.
So just 2 elephants to feed and house and clean up after...
But then there are the other elephantids and their non-elephantid relatives - after all, no macroevolution allowed! - mammoths and mastadons, gomphotheres, etc... My goodness that ark is very very rapidly running out of room - even BEFORE we learn of the magical genetics!
And apparently it is 7 PAIRS of clean animals... Animals like bison and cattle... 14 bison - is that a herd?
Can't wait to be thrilled with specific scientific evidence and details for how all this happened! And because this is TRUE, there must be all kinds of evidence for it all!