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Comparison Between Horizontal And Vertical Drainage
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16. Storm water drainage - WHO
www.who.intThe area of roof to be drained is calculated on the basis of the horizontal projection and not on the actual surface of a sloping roof. Table 16.2 shows the maximum roof area that can be drained by five common sizes of vertical downspouts or leaders when the rainfall intensity is 100 millimetres (4 inches) per hour.