Contradiction with Genesis 8:1
God remembered Noah and the waters assuaged, whereas Genesis 7:18 describes the waters increasing and prevailing.
Genesis 8:1: And God remembered Noah, and every living thing, and all the cattle that [was] with him in the ark: and God made a wind to pass over the earth, and the waters asswaged;
Contradiction with Genesis 7:24
States the waters prevailed upon the earth for 150 days, while Genesis 7:18 speaks of continual increase and doesn't specify a timeframe.
Genesis 7:24: And the waters prevailed upon the earth an hundred and fifty days.
Contradiction with Genesis 8:3
Contradicts with the idea of the waters continually increasing as it describes the waters decreasing after 150 days.
Genesis 8:3: And the waters returned from off the earth continually: and after the end of the hundred and fifty days the waters were abated. [continually: Heb. in going and returning]
Contradiction with Job 38:8-11
Indicates God set boundaries for the waters, contrasting with Genesis 7:18's depiction of unrestrained waters prevailing.
Job 38:8-11: Or [who] shut up the sea with doors, when it brake forth, [as if] it had issued out of the womb?
Contradiction with Psalms 104:7-9
Describes God rebuking the waters and setting boundaries, unlike Genesis 7:18 where waters freely prevail upon the earth.
Psalms 104:7-9: At thy rebuke they fled; at the voice of thy thunder they hasted away.
Contradiction with Isaiah 54:9
References God's promise not to cover the earth with a flood again, in contradiction to the action described in Genesis 7:18 of waters covering the earth.
Isaiah 54:9: For this [is as] the waters of Noah unto me: for [as] I have sworn that the waters of Noah should no more go over the earth; so have I sworn that I would not be wroth with thee, nor rebuke thee.
Contradiction with 2 Peter 3:6
Refers to the pre-flood world perishing, highlighting an end, whereas Genesis 7:18 speaks of ongoing conditions.
2 Peter 3:6: Whereby the world that then was, being overflowed with water, perished: