Flood Waters - View from Afar

According to a Catastrophic Plate Tectonics model, the mantle and crust of the Earth shifted violently during the year of the Noachian Flood.

Where did the water go after the Genesis Flood? Catastrophic plate tectonics is part of the explanation.
Apollo 17 "Blue Marble" — NASA
If the planet was indeed covered with water, where did the water go? If the Earth was smoothed out, it would be covered with water for a depth (depending on the estimates) of 1.6 to 2 miles, so there is rather a lot of it. The continents and mountains rose, the water ran off into the newly-formed ocean basins according to this model.
NASA's Image of the Day for January 25, "Blue Marble," is a composite of images taken by the Suomi NPP satellite that provides an exquisite view of the earth from space. This is the latest in a series that began with the famous "Blue Marble" photo taken in 1972 by the Apollo 17 crew.
This image can help answer a question that creationists often hear: If the entire earth really was covered during the Flood of Noah's day, then where did all that water go?
According to the Bible, the water retreated from the surface of the earth, apparently running off the continents into newly created ocean basins. Geophysicist John Baumgardner developed a detailed, feasible model called Catastrophic Plate Tectonics of how the earth's mantle and crust might have shifted and interacted during the Flood year. According to this model, the configuration of today's ocean floors formed during the latter months of the Flood year.
You can paddle your way over to "NASA Earth Image Helps Answer Flood Question", here, to finish the article.