“If we take ocean basins and bring them up and take mountain ranges and continents and bring them down to a level position, there is enough water to cover the earth 1.6 miles deep (2.57 km deep), so there is plenty of water on the earth for a global Flood. Yet there was only the need for the highest underwater peak during the Flood to be covered by 15 cubits (22.5 feet or ~6.8 meters based on the small cubit to 25.5 feet or ~7.8 meters based on the long cubit) per Genesis 7:20.”