The Orthodox Jewish bible and Young's literal translation both say that the flood was only a realistic 15 cubits high.
Bereshis 7:19-21 OJB -
19 And the waters rose exceedingly upon ha’aretz; and all the high hills, that were under kol HaShomayim, were covered.
20 Fifteen cubits upward did the waters rise; and the harim were covered.
21 And kol basar perished that moved upon ha’aretz, both of Oph, and of Behemah, and of Beast, and of every Swarming Thing that swarms upon ha’aretz, and kol haadam;
Genesis 7:19-21 YLT -
19 And the waters have been very very mighty on the earth, and covered are all the high mountains which [are] under the whole heavens;
20 fifteen cubits upwards have the waters become mighty, and the mountains are covered;
21 and expire doth all flesh that is moving on the earth, among fowl, and among cattle, and among beasts, and among all the teeming things which are teeming on the earth, and all mankind;
I wonder if the writers of the evangelical fantasy versions ever discussed their interpretations of the Hebrew text with a rabbi or a Hebrew scholar.