Dr. Brown really does cover all those bases, but I couldn't do the explanation justice by summarizing. He does say that the outgoing material would include sediment material in addition to the water, and that it would have eroded the surrounding area.
He says the temp of the water under the approximate 6 miles of rock would have been about 250 degrees F. He says that at the time of the rupture the strain energy alone would have been about 2 X 1029 ergs. The released compressive energy would have been about 1033 ergs.
As far as I can tell, he covers all bases. But then, my HS Physics, mostly forgotten, isn't up to the task, as I've intimated before.
I'd suggest you read the book and see for yourself. Seriously.
Two things. There are no erosion patterns to be found in the geological column that matches what Dr. Brown's mention. Also, 10^33 ergs is equal to 100 octillion watt-seconds (joules), or 100,000,000,000,000 Terawatts. That's a couple of orders of magnitude greater than my estimates. That heat is going to really cook Noah and his.