Rotterdam port adaptation strategy for climate resilient transport and business activities

The Port of Rotterdam — Europe's largest port, handling over 460 million tonnes of cargo in 2022 (about 8% of all cargo handled in Europe) — lies above sea level but outside the Netherlands' main dike system, so it is naturally protected from today's flood risk but directly exposed to future sea-level rise. Working from Rijkswaterstaat/KNMI projections of +26 cm to +124 cm sea-level rise by 2100, the Port of Rotterdam Authority (PoR) and the Rotterdam municipality co-developed an adaptation strategy with stakeholders and experts, tailored separately to each of the port's six distinct sections given their differing heights, land uses and infrastructure.

The strategy aims to provide a menu of adaptation measures for each port area, primarily to reduce the economic damages expected from flooding, and secondarily to reduce environmental damage (e.g. from pollutant dispersion) and the risk to human life.

Measures are grouped into three types: prevention ('keep water outside' — raising embankments, roads and using lockable or removable barriers), spatial adaptation ('live with water' — relocating critical activities to higher ground, wet-proofing or dry-proofing facilities, elevating sites), and crisis management ('being prepared' — emergency plans, stockpiling, temporary emergency dykes). Each of the port's six areas was assigned a tailored combination of these measures based on its specific flood-risk modelling and the priorities of the companies operating there.

A cost-benefit analysis of the recommended, area-specific measure packages estimates their present-value cost at almost €90 million against expected benefits (avoided economic damage) of about €611 million — a benefit-cost ratio of 6.8. An alternative package built around a single large 'lockable open' barrier (similar to the Maeslant Barrier) was also assessed: it would cost around €820 million and yield an estimated €1,608 million in benefits, more than doubling total benefits but at a lower benefit-cost ratio of 2, making it a less cost-effective option overall.

The Port Authority attributes the strategy's robustness to its basis in scientific climate modelling (regularly updated), its fine-grained tailoring to each port area's specific features, its co-design with the stakeholders directly affected, and its underpinning cost-benefit analysis. The main limiting factor is the sheer complexity of the port's interconnected economic activities and infrastructure links to the Dutch, European and global economy, which forced the strategy to be developed and adjusted separately, and at different times, for different areas — for example, weighing alternative future land-use scenarios (economic versus mixed residential use) for the Merwe-Vierhavens area.