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admiralbundy t1_iwk8e1g wrote

You can lower the full supply level to create airspace or a flood mitigation zone. This would trade off the available water supply in exchange for dam safety protection.

However, almost all dams in an extreme event are filled multiple times over by the inflow, thus making any lowering of the storage prior to the event futile.

But it is a valid point and in some dams can be useful.