Tom
Beta Return
Could that concrete structure be holding tanks for water that would be recirculated for water falls?
Possibly, but the reservoirs will most likely be located more "backstage". Those walled structures look to be right up in the thick of things.
I am thinking that they are just going to be supports for the rock work façade.
I don't think the walled structures are there as structural support for mountains or buildings. I think they're just lower-level walls, which will be backfilled around and essentially become basements.
They could be utility vaults too, which would logically go underground or on the lower level of buildings.
They could be pump rooms, with the water reservoirs being elsewhere.