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No need to be nave, mate. The flood lasted for 150 days, no? That's plenty enough time for the mess-up slush to settle out (creating the column). Then, as the waters receded, it carved the canyon. It might seem strange that the canyon could be carved in so short a time; but two things you must remember: (1) there was a LOT of water on the Earth, and it all soaked up/ran off VERY fast, which made the erosion quicker, and (2) the layers were SOFT right after the flood, and so it would've taken even less to wear them down. Combine #1 w/ #2 and it's pretty easy to see how the canyon could erode that quickly, right after the depositing of the column.
Good job!
You know about the hydropale theory? How the floodwaters came from underground chambers that shot up into the sky along the Mid-Oceanic Trench? If you think that the pre-flood terrain was pretty much level (all the more able to build a huge, perfect garden), then all of the waters of the ocean would have covered up the pre-flood earth.
And, when the continents bordering the Atlantic started to slide away from eachother, they'd hit the same force on the other side soon, causing them to buckle. Thus, you have the Rockies, the Himalayas, etc. along the Pacific coasts and a bit on the Atlantic (the Apalachians). These would have lifted the land quickly and violently out of the water.
This could (and probably would) create a huge lake just behind the Rockies (not in the Great Plains, but in the high flat parts of Utah and Colorado). Then, the pressure of the lake might cause part of the wall to collapse, forcing the water to pour out of the lake. This water could easily carve out the Grand Canyon from the soft, newly-deposited sediments.