[dinkblam]

> Flood-prone terrain is then elevated by injecting a wood-based slurry 15–300 feet underground. > The Ark system is sized to lift an acre by a foot each day.

this sounds like science fiction, it would need to uniformly lift between 18.500 and 370.000 cubic meter of soil/rock by 30cm a day.

300.000 m³ soil/rock would weigh something like 600.000 tonnes and would require ~1.8 GJ to lift by one foot even with zero loss and discounting all other factors apart from lifting the mass.

[0_____0]

1.8GJ is pretty much exactly 500kWh? That's not awful in terms of energy, although intuitively I suspect that the real-world energy used would be at least an order of magnitude higher than the gravitational potential energy gain.

[euroderf]

500kWh is like a hundred bucks, yes ?