We're working on an apartment complex that has 3 storm water retention
ponds. The bottoms of these ponds will be submerged or at least boggy
during the wet part of the year, and during the summer, could be very dry.
There is an irrigation system that can be used to keep vegetation growing.
Combined area is close to an acre.

My question is, does anybody have recommendations for perennial plants that
might survive under these conditions? Am thinking about Acorus or Iris or
other things that are typically considered bog plants. We've already rotted
one round of Bermuda sod, and we need an alternative. Zone 9, southeast.