The way is already clear to us! Basement door and chimney! But against these amounts of water that came down on August 14th, there is hardly any possibility! The whole city was underwater as if after a flood!
Chimney, if from above then a chimney cap. Basement door, shaft with pump inside or outside, also divert the path of the water to the basement door, sometimes the own path drains into the own basement
The path is clear to us! Basement door and chimney!
But both are routes where there is no backflow valve at all. Insurance companies thrive on denying their obligation to pay. I would therefore not go to the GWS installer with the matter, but to a lawyer specializing in insurance law.
The whole city was underwater as if after a flood!
In a polder, during a storm surge, the entire sea is underwater as well, structural measures can provide protection, therefore reduce inflow, divert, channel off, protect low points or use them for pumping out. Those who do nothing will keep flooding repeatedly, with an increasing tendency.
The way is already clear to us! Basement door and chimney! But against the amounts of water that came down on 14.8, there is hardly any possibility! The entire city was underwater like after a flood!
A well-known basement manufacturer has built a floating house for demonstration purposes. Nothing gets in there either ;)