Where is all that water [from the Flood] now?
The short answer to this Facebook question is that our planet is called the “Blue Planet” for a reason! It’s covered in 70% water, so the water from the Flood is still here, making up our oceans!
Lower the Mountains and Raise the Valleys
The oceans cover over two-thirds of the earth’s surface to a great depth. The average depth of the major oceans, beyond the continental shelves, is about 12,000 feet, while some trenches are significantly deeper than Mt. Everest is high. That’s a great deal of water. So much water that if you lowered the height of today’s mountains and raised the ocean valleys, there would be more than enough water to cover the whole surface of the earth.
This raises the question: was the world different before the Flood?
Shallow Seas and Low Mountains
Most creation researchers believe the world before the Flood was radically different from today’s world. This pre-Flood world had shallower seas (no deep ocean trenches) and lower mountains, scattered across a single continent (Genesis 1:9 implies there was just one continent). Most of today’s mountain ranges were probably built by tectonic forces initiated during the Flood. We know this because mountain ranges are full of fossils (mostly marine), and fossils are largely a Flood phenomenon.
Psalm 104:8, speaking poetically of the time of the Flood, describes the mountains rising and the valleys sinking and Genesis 8:3 tells us that the waters “receded from the earth continually.” So the water did not need to rise to cover today’s Mt. Everest because it didn’t exist before the Flood but, rather, was formed during, or shortly after, the Flood by tectonic forces. (These mountains are still growing very slowly in elevation). Evolutionists also believe the mountains were formed by tectonic forces, but they believe it happened over millions of years rather than catastrophically during the yearlong Flood.
Water Under the Earth
It’s likely that all of the water we have on earth today wasn’t above the crust before the Flood. Subterranean waters, from under the earth’s crust, probably supplied some of the floodwaters. Genesis 7:11 tells us the fountains of the great deep burst forth, implying there was water under the crust that gushed forth when the Flood began. Research has shown there is likely still more water under the crust than above it, even today. This is not surprising considering the earth was formed in water (Genesis 1:2; 2 Peter 3:5).