Not mine, but saw it being built in the village and thought I would share.
It's being built on a riverbank and the floor is (pwill be) a few feet higher than the last big flood level.

Walls are solid concrete cast in place and tied into the pillars. The interior is sort of an inverse cantilever setup. I'm not sure if they are trying to stop the walls collapsing in or prevent them from blowing out.

Sees a very odd way to build in a flood zone.