We're going to ignore the possibility that Psalms 42:7 is flowery poetic language intended to teach us something spiritual. Instead we're going to use it as the description of a hydrological system in a test of Hypothesis 22.
Deep Calls to Deep
The Great Deep
The deep and the great deep are both translated from the same Hebrew word, tehom. The difference signifies a transition from the deep where Earth was created to when the great deep is in the interior of the Earth.
How Deep was Noah’s Flood?
There was enough water in the great deep to flood the Earth 1,200 km deep. 15 cubits was when the crew of the ark stopped taking soundings. Mount Everest formed 101 years AFTER Noah's flood during Peleg's tectonics.
The Volume of the Great Deep
When Noah's flood took place all of the waters of the great deep burst forth and flooded the Earth. If we know the volume of water and the radius of the Earth at this time, then we may calculate how deep the water was.
It Devoured the Great Deep
Thus hath the Lord GOD shewed unto me: and, behold, the Lord GOD called to contend by fire, and it devoured the great deep, and did eat up a part. (Amos 7:4) KJV
March 6th
The preacher ponders rivers running into the sea. It may be rhetorical, a mystery of God. Or it's a hydrological cycle, and it's obvious and logical.
March 5th
In a prophecy against Assyria, comparing it to the greatest tree in the garden of Eden, we're told that the deep.. sent out her little rivers to water all of the trees. It sounds like a hydrological cycle.