Keeping on topic...
Considering the weight of the water during a global flood, we have data which supports the lowering of the ocean floor, the pre and post flood.
The ocean bottom subsides elastically
The Ocean Bottom is Sinking
The bottom of the ocean is more of a "sunken place" than it used to be.
In recent decades, melting ice sheets and glaciers driven by climate change are swelling Earth's oceans. And along with all that water comes an unexpected consequence — the weight of the additional liquid is pressing down on the seafloor, causing it to sink.
Consequently, measurements and predictions of sea-level rise may have been incorrect since 1993, underestimating the growing volume of water in the oceans due to the receding bottom, according to a new study. [7 Ways the Earth Changes in the Blink of an Eye]
Scientists have long known that Earth's crust, or outer layer, is elastic: Earlier research revealed how Earth's surface warps in response to tidal movements that redistribute masses of water; and 2017's Hurricane Harvey dumped so much water on Texas that the ground dropped 0.8 inches (2 centimeters), the Atlantic reported.
In the new investigation, researchers looked at more long-term impacts to the seafloor. They evaluated how much the shape of the ocean bottom may have changed between 1993 and 2014, taking into account the amount of water added to the ocean from liquid formerly locked up on land as ice. Previous research into seafloor stretching had omitted that extra water, the scientists wrote in the study.
So, there is evidence the height of a mountain above sea level, would be significantly altered after sea level drops.
The following illustrates this.
Before the flood
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Sea level rises and the sea floor lowers; mountains rise
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Sea level rises and the sea floor lowers; mountains' rise restricted by weight of water
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Mountains covered; Weight on both sea floor and mountains, balanced
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Water recedes; Sea level rises and the sea floor lowers; mountains rise
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Weight of water lowers ocean floor, and the result is mountain is significantly raised above sea level
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These factors are combined with the mountain uplift from continental drift, and growth spurts.