I think it needs to be connected for mosquito control, right? I recently watched a great video about how they got rid of the mosquitoes at WDW in the 1960s by digging canals and creating a massive drainage system.
I recently watched the same video. It was well done!
But hey, maybe the current crop of Imagjneers know water management better than the administrators of the Panama Canal.
OR... its filtered and recycled and sanitized water like a fountain or Journey of Water.