They are becoming quite common in large scale developments which don't / won't drain particularly well. Cities are becoming wary of hooking too much onto their storm sewer systems and also having the additional problem of property owners not maintaining their on-site filtration systems (such as underground sand/oil interceptors).
They make sense for alot of reasons, but property owners usually don't care for them because of the amount of space they take up. That being said, I've seen alot of them used in shopping center parking lots. Certainly prettier than on-site water detention basins.
I don't have any pictures handy though...
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