This calls to mind those signs at the Grand Canyon that claim it took millions of years to carve it. Then Mt Saint Helens happened, and carved a canyon 1/4th the size of the Grand Canyon overnight. Water is an incredibly destructive force.
Uniformitarianism excludes the possibility of catastrophe, or at least refuses to recognize the possibility of catastrophe. It’s not science. It’s philosophy that’s too dishonest to admit that fact.
Even the ICR uses this number and also says: "In Spirit lake, north of the volcano, an enormous water wave, initiated by one-eighth cubic mile of rockslide debris, stripped trees from slopes as high as 850 feet above the pre-eruption water level. The total energy output, on May 18, was equivalent to 400 million tons of TNT - approximately 20,000 Hiroshima-size atomic bombs."
Impressive. Let's compare to the Grand Canyon. The Colorado River travels over 1400 miles to the Gulf of California. The amount of rock that would need to be moved would be orders of magnitude greater, there would be hundreds of cubic miles of rock which would eventually end up in the Pacific Ocean. The amount of water required to move that much rock and disperse it into the ocean would be thousands of cubic miles of water. With that much force behind it there is no possible way that the Colorado River would make multiple "U" turns on its journey to the sea. That much force would cut a straight path with very shallow sloped sides, not deep canyons with vertical walls made of limestone, shale and sandstone.