The problem is that the pyramid was 200' above the Nile even at high nile.
There is no known means by which the Nile could have flooded the pyramid.
This leaves us either to seek a new means, reinterpret the meaning of the
statement, or discard it altogether.
I tend toward reinterpreting it since it's possible to just assume he was
using words in a different way than modern usage. This means he was right
but that being right doesn't demand that water from the Nile directly im-
pacted the pyramid.
I have a different idea about what the tales of water or salt lines on the
pyramid meant. I bwelieve it's related to the red band around the base of
the heiroglyph for "pyramid". It was caused from water leakage and siderite
staining from the 160' level on down.