> > There are many structures built today with huge quantities of
> > material for the same reason the pyramids were. The secondary
> > part is unique for anything of that size, tho the technique has
> > been used at a smaller scale often. I honestly can't think of a
> > better way of achieving the same goal, and it seems neither can
> > many modern engineers.
> What, where, who?
Well for the first part to manage water pressure, there's the hoover dam, Aswan Dam, Natural spa springs with managed water supplies, etc.. You'd have to look up where and who.
As for the second part, you only have to look on the roof of a chinese house there are plenty of devices that add the sun's energy to water. Of course its nothing like the scale of Khufu which is of the order of gigawatts per day.