King James says
[6] Thou coveredst it with the deep as with a garment: the waters stood above the mountains.
[7] At thy rebuke they fled; at the voice of thy thunder they hasted away.
[8] They go up by the mountains; they go down by the valleys unto the place which thou hast founded for them.
[9] Thou hast set a bound that they may not pass over; that they turn not again to cover the earth.
Psalms 104: 6-9
I struggle to find anything in that which could be taken as meaning the mountains increased in size, or the valleys increased in depth.
Edited by Mr Jack, : No reason given.