Behold, he withholdeth the waters, and they dry up: also he sendeth them out, and they overturn the earth. He withholdeth the waters - This is, I think, an allusion to the third day's work of the creation, Genesis 1:9 : And God said, Let the waters be gathered together unto one place, and let the dry land appear. Thus the earth was drained, and the waters collected into seas, and bound to their particular places.
Also he sendeth them out - Here is also an allusion to the flood, for when he broke up the fountains of the great deep, then the earth was overturned.