Regarding stage error

[Girishchandra-Yendargaye]

How does stage works.
Ideally stage should be added over the elevation but it is not doing so.
When We tried to say 1.5

Area where elevation is less than 1.5 we can see water but area where elevation is more than 1.5 we don't see water..what could be issue

[Girishchandra-Yendargaye]

Instead of set add quantity is doing same