The pictures in Herald article show the three corner 'fly' shading up on many of the units.
When we were there in December there was one up for a day.
It was very obvious that the low point of the covering was in the middle somewhere so that many gallons (ok, it is France so liters) of rainwater would collect whenever it rains.

If this happens it is likely that the canvas will not be able to support the weight (ok, France so it should be mass) of the water( H2O everywhere) and rip.

Solution is a drain hole at the low point or lower of the corners dramatically limiting the amount of water collected before it can naturally overflow!