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Drifting snow on small canopy

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Paraphrasing ASCE J of Struc Engr 1990 Vol 116 No. 3
pg 650 (by O'Rourke):  "drift provisions are
applicable only for delta h up to 25' to 30', since
one does not see substantial drifts if delta h is more
than three stories."

d a v e e v a n s 

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