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Different roof-systems monitored by KWR for two years: what have we learned?

The year 2018 was characterized by an enormously long dry period in the Netherlands. In a period of 5 months, starting mid April 2018, the roof in the City of Amsterdam received no significant amount of rain. This provided the opportunity to observe how different roof-systems reacted to these circumstances, and what would be necessary to keep plants alive during this long drought.

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