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why water doesn't fall down from hole on the roof when its raining heavily (water moves fast on the roof) ? Can I know the theory behind this and the factors affecting?

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  • $\begingroup$ Maybe the Venturi effect? wassertec.co.za/wp-content/uploads/venturis-mazzei-768x235.jpg $\endgroup$ – user190081 Nov 6 '18 at 16:45
  • $\begingroup$ What kind of hole size and what sort of roof slope are you talking about? $\endgroup$ – Samuel Weir Nov 6 '18 at 20:50
  • $\begingroup$ yeah it seems the Venturi effect and Bernuli effects have a connection to this ! I am in need of building a mathematical model to determine the flow rate of the liquid where the liquid will not drop down from the hole. So Im looking for the parameters affecting this phenomenon. Thanks guys :) $\endgroup$ – Oshana Dissanayake Nov 7 '18 at 14:40

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