Question

which different small drifted from the rooftop​

Answer 1

Answer:

There are some roof geometries where two, 2-D drifts overlap or occupy the same roof area. One such roof geometry is the Northwestern corner of a roof with parapet walls along both the North and West edges.

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Answer 2

Answer:

The reason we get drift loads is the sloped or vertical surfaces act as barriers for blowing snow that would normally get blown off a roof or evenly distributed around a roof. So, say if you have a low sign right at roof elevation (no gap) then it will build up a small drift in front and/or behind the sign.