Here is an excellent description of what may have transpired according the the "GILL COMMENTARY" regarding the flood waters.
the same day were all the fountains of the great deep broken up, and the windows of heaven were opened;
and by both these the flood of waters was brought upon the earth, which drowned it, and all the creatures in it: by the former are meant the vast quantities of subterraneous waters, which are more or greater than we know; and might be greater still at the time of the deluge:"there are large lakes, (as Seneca observes (z) ,) which we see not, much of the sea that lies hidden, and many rivers that slide in secret:''so that those vast quantities of water in the bowels of the earth being pressed upwards, by the falling down of the earth, or by some other cause unknown to us, as Bishop Patrick observes, gushed out violently in several parts of the earth, where holes and gaps were made, and where they either found or made a vent, which, with the forty days' rain, might well make such a flood as here described: it is observed (a) , there are seas which have so many rivers running into them, which must be emptied in an unknown manner, by some subterraneous passages, as the Euxine sea; and particularly it is rem ark ed of the Caspian sea, reckoned in length to be above one hundred and twenty German leagues, and in breadth from east to west about ninety, that it has no visible way for the water to run out, and yet it receives into its bosom near one hundred rivers, and particularly the great river Volga, which is of itself like a sea for largeness, and is supposed to empty so much water into it in a year's time, as might suffice to cover the whole earth, and yet it is never increased nor diminished, nor is it observed to ebb or flow: so that if, says my author, the fountains of the great deep, or these subterraneous passages, were continued to be let loose, without any reflux into them, as Moses supposes, during the time of the rain of forty days and forty nights; and the waters ascended but a quarter of a mile in an hour; yet in forty days it would drain all the waters for two hundred and forty miles deep; which would, no doubt, be sufficient to cover the earth above four miles high: and by the former, "the windows" or flood gates of heaven, or the "cataracts", as the Septuagint version, may be meant the clouds, as Sir Walter Raleigh (b) interprets them; Moses using the word, he says, to express the violence of the rains, and pouring down of waters; for whosoever, adds he, hath seen those fallings of water which sometimes happen in the Indies, which are called "the spouts", where clouds do not break into drops, but fall with a resistless violence in one body, may properly use that manner of speech which Moses did, that the windows or flood gates of heaven were opened, or that the waters fell contrary to custom, and that order which we call natural; God then loosened the power retentive in the uppermost air, and the waters fell in abundance: and another writer upon this observes (c) , that thick air is easily turned into water; and that round the earth there is a thicker air, which we call the "atmosphere"; which, the further it is distant from the earth, the thinner it is, and so it grows thinner in proportion, until it loseth all its watery quality: how far this may extend cannot be determined; it may reach as far as the orb of the moon, for aught we know to the contrary; now when this retentive quality of waters was withdrawn, Moses tells us, that "the rain was upon the earth forty days" and "forty nights": and therefore some of it might come so far as to be forty days in falling; and if we allow the rain a little more than ten miles in an hour, or two hundred and fifty miles in a day, then all the watery particles, which were 10,000 miles high, might descend upon the earth; and this alone might be more than sufficient to cover the highest mountains. (We now know that the earth's atmosphere does not extent more than a few miles above the earth's surface, before thinning out rapidly. If all the water vapour in our present atmosphere fell as rain, the ground would be covered to an average depth of less than two inches (d) . Even if there was a vapour canopy, this would not be a major source or water. Most of the water came from subterranean sources or volcanic activity. We know that volcanic eruptions spew much steam and water vapour into the atmosphere. This would later fall as rain. For a complete discussion of this see the book in footnote (e) . Ed.)
(t)
In Bab. Roshhashanah, fol. 11. 2.
(u) Pirke Eliezer, c. 23.
(w) Elmacinus, p. 11. apud Hottinger. p. 251. Abulpharag. Hist. Dynast. p. 8.
(x) Apud Syncell. p. 30, 31.
(y) De Iside & Osir.
(z) Nat. Quaest. l. 3. c. 30.
(a) Bedford's Scripture Chronology, c. 12. p. 154.
(b) History of the World. B. l. c. 7. sect. 6.
(c) Bedford's Scripture Chronology. p. 153. See Scheuchzer. Physica, vol. 1. p. 45. Ray's Physico-Theolog. Discourses, Disc. 2. c. 2. p. 71.
(d) The Genesis Flood, Whitcomb and Morris, 1978, The Presbyterian and Reformed Publishing Company, p. 121.
(e) Ib
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