Herodotus, in the second volume of his investigation, evokes the artificial Lake Méoris extended to south of Fayum. He says that he saw it was "a work done by the hand of man, fed by the Nile six months a year and flowing into the Nile the remaining six months."
It is amazing that no researchers have looked to this claim. Today, the Fayum is still watered by a branch of the Nile. There is no doubt on the feeding of this lake, but the reverse does not exist.
The researchers consider that there was a significantly higher level of water in what is now called the "Lake Qaroum". The water level of the middle of the 1st millennium BC can even be estimated because Herodotus noted that both Biyahmu monuments were built at the waterline.
Herodotus states further that "the locals said it empties into the Sirte of Libya by an underground conduit and it sinks to the west in the interior and goes along the mountains that are over Memphis."
I am surprised that no one reveal on this description with the mention of Memphis.
When looking at this area from the sky, we guess the arrival of a former channel to the three great pyramids, in the axis of caves in which were found dismantled ships. It may be, therefore, that there was a channel more in height than the current "al Bahr al Jizah Lubayni" allowing movement of blocks by boat form end to end. Probably existed then a port very close to the monuments.
Another important finding that researchers have not exploited: the presence of the remains of a enclosure wall around each pyramid. That of Cheops is located ten meters around the base.
The enclosure the best preserved is that of the stepped pyramid of Djoser:
The enclosure wall is a typical retaining wall of the Old Kingdom of Egypt which reduced the pressure by interference between two buttresses. But where was the pressure? The only one that may be advanced is that of water that would have been intentionally introduced into the enclosure prior to construction. With a water level inside, such a structure can facilitated the moving of the blocks. For the higher ranks, a maintaining of a maximum level of water can allow the hoisting of each block using, for example, a gantry on slide rafts mobile above the top of the pyramid.
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My notes of veracity :
The pyramids construction was facilitated by maintaining an adjustable water level in an enclosure wall: 3/5