The phenomenon of water accumulation on small low slope roofs (? 5%) is one of the causes of accidents among the most recurrent. This usually occurs on low-slope roofs in case of rain or flooding evacuations.
Under the water load, the beams supporting the cover are deformed and a pocket occurs. The water charge accumulates and thus creates more distortion, which in turn increases the accumulation of water, etc. For roofs "flexible", a collapse can occur if the water discharge is slower than accumulation.
The importance of this phenomenon and its effects is emphasized but not or poorly treated in the French rules and Eurocodes.
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