just want to emphasise... "washing away the soil" requires a lot of energy to be in the water, which means it has been moved far from its normal position in the basins of the oceans
think of image of the spacecraft rising out of the sea in the first episode of the new Dune movies... when that much water moves around, it takes quite some time for it to return to its level, you can see it happening in small scale when you pull an object suddenly upwards out of water, it takes time for the water to return to its repose in the container
now, imagine that half the ocean gets suddenly thrown sideways up onto the land, and think of the complexity of the contours and dips and curves of the land, and that the way the land may have been shaped by evaporation and cloud formation was dictated by the wind and the mountains rather than the particular direction the water flowed from... there will be a lot of resistance to it coming back to the level, but likely it would return to normal after a few weeks to maybe at most a couple of months... some contours will retain water longer than others, but all that loose ground, if it is hit hard by a lot of water even the deepest rooted trees will not hold it, it will be washed away, and as is the process for sedimentation, the heaviest, biggest, most streamlined objects will stop moving first, and then progressively smaller, and less streamlined particles will settle over top
and whenever water moves in one direction, it often hits a barrier and washes back the other direction, and it can happen that as it returns to its place a wave comes from the opposite direction and washes it back again where it first went
this much more clearly explains how you get progressive differing layers of sedimentary rock forming, each layer the slosh-back from waves of oscillation as the ocean slowly loses its momentum over weeks
i mean, idk, it's pretty epic to think about, what would happen if the earth were to suddenly shift 90 degrees in any direction, how long it would take for the water to all fully return to the sea
it takes weeks for floods to subside, and this is 100x more water movement