God gave Noah specific dimensions and instructions on building the ark. Presumably enough to hold all the animals, Noah's family and probably some food. If it was up to men to choose how would God know how big to build the ark? God gave a way for Noah and his family to be saved only.
Well, of course God foreknew that only Noah and his family would board the ark.
But while you're online, I have a question.
OK ... switch to the New Testament.
In Calvinist thought ... what is going on between Jesus and Satan in regard to the temptations ?