How to deal with uneven settlement of reinforced concrete reservoir due to accumulated water?

I think this problem is difficult to deal with. There are ways to forcibly return to the original position, but there will be great costs and risks, and it is estimated that the loss will outweigh the gain.

Personally, if it is a construction unit or a construction unit, it should be identified with the design and geological prospecting units. Personally, I think such settlement will not affect the use function and structural safety of the swimming pool. It's best not to deal with it. In addition, such problems should not be the responsibility of the construction unit (if you have backfilled in time and the backfill compaction is qualified). Therefore, all aspects may not be difficult for you.

If it is necessary to restore the state of the pool, the simple and feasible method is to use buoyancy to continue pouring water out of the pool, drain the water in the pool according to the calculated value, and then balance the weight. I have successfully disposed of the oil slick. Small pools should be ok, but big pools are too risky.