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On a roof pitched to the outside it depends if there is aparapet or not. With parapet the drain opening limits the flow rate. Without the water just overruns the roof edge. With floating top tank you have a parapet without any openings as the roof level varies with amount of stored liquid. So the roof's drainage has to be sufficient: <a href="http://www.ansonindustry.com/uploads/allimg/Floatingrooftankstructure.jpg">http://www.ansonindustry.com/uploads/allimg/Floatingrooftankstructure.jpg</a> So all depends on the rainfall it is designed for. And I'm quite sure it wasn't designed for Harvey's rainfall. Regards, Volker
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