@DrewDad,
Imagining some sort of basin that has a removable cover, the cover so that the rain doesn't just fill that, but with the cover removable for later evaporation., possibly connected to some kind of irrigation system for dry times of the year. Or maybe some underground tank system that also could be used for other-time irrigation, with a parking lot over it. Or...
(talking through my hat, just musing what could be done). Have stadia in these situations be built
over a retention system, that would be usable for irrigation at another time...
Or put roof over stadium, not an attractive idea to me though it's done often at least in the building of new stadia. (What would Calatrava do....)