I only put that on there because regular floodplains still exist outside of GS and the flooded tiles are for GS only.Sadly I don't think it's happening unless the water theatre can also be built on non-GS terrain, since the civ isn't listed as requiring GS.
I picture it the same as Ethiopia's rock hewn church needing either only hills, for base game, or also volcanic soil for GS only.
Edit: I guess floodplains in the base game and R&F are only for desert though right? So maybe I should change it to require flat land along a river in base game.
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