All other applications of solar have standard engineering practice to deal with the extreme conditions of their installation environments. See for example this top hit from a web search about solar and hail:

https://www.energysage.com/solar/solar-panels-hail-hurricane...

I imagine they simply design for floating panels just as they have designed the installations in all other settings.

Reservoirs are generally stable.

Much broken panels littering the shores I guess.

Besides I'm sure fish won't like decreased oxygen levels storm or no storm.