Are all dams the same?
Take for instance the curious case of the two Hoovers.
The deep canyons of the American West provide for a huge amount of storage capacity, but filling them is limited by a semi-arid climate which produces very little rain (less than 11 inches per year). Compare that to tabletop flat south Florida that has prodigious amounts of rain (over 50 inches per year), but little in the way of topographic relief to store it long term.
The result for both is similar.
Excess Lake O water is released (i.e. wasted) to tide (see below) whereas dwindling levels in Lake Mead is pinching municipal obligations and power generating goals. Lake O is perhaps unique in its ability to bounce from flood to drought mode schizophrenically in a half year's time.
In comparison it's been a continual decade-long drought for Lake Mead.
Each wishes for what the other has:
The West our rain and Florida their storage.