Thus it is not hard to envisage the rapid carving of the landscape features that we see on the earth today, including places such as the Grand Canyon of the USA.
Unless you actually look into the deposition and downcutting of the rocks of the Grand Canyon, or of practically any other erosional landform on Earth. We know what "rapid carving" looks like from the Channeled Scablands in Washington State - and we know that that flood was local.