What will be the rain load (in psf) if ds is 2 inches and dh is 1 inches?
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The correct answer is "15.6 psf"
Explanation:
Roof is designed for the rain loads that comes on it when primary drainage is blocked and the depth of water rises above the inlet of secondary drainage. This accumulated rain water will cause a uniform load on the roof. Following formula is used to calculate the load of rain water.
Rain load = 5.2 ( ds+dh)
Rain load = 5.2 (2 +1) = 15.6 psf
ds = depth of water upto the secondary inlet of drainage in inches
dh = extra depth of water above the secondary inlet of drainage in inches
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