No Solid Ground: Three Architectural Strategies for Building Below Sea Level in Rotterdam

Rotterdam explores resistance, accommodation, and acceptance as primary architectural strategies to combat rising sea levels and unstable ground in the Netherlands.

By: AXL Media

Published: Apr 9, 2026, 10:43 AM EDT

Source: https://www.archdaily.com/

Resistance Through Heavy Infrastructure

The resistance model operates on the principle of exclusion, utilizing massive engineering works to maintain dry ground at all costs. The most prominent example is the Maeslantkering, a storm surge barrier with steel arms larger than the Eiffel Tower that closes automatically during oceanic threats. This approach is supported by the polder system—a layered network of pumping stations, ring dikes, and drainage channels that mechanically remove groundwater. High-density projects like OMA’s De Rotterdam rely on this invisible infrastructure, using deep-driven piles to bypass unstable peat and clay layers. While effective, this model creates a dependency on centralized systems that must function perfectly and indefinitely.

Accommodation and the "Sponge City" Philosophy

In contrast to total exclusion, the accommodation model treats water as a visible, managed element of the urban fabric. This strategy focuses on "blue-green" infrastructure designed to absorb, store, and slowly release rainwater to prevent sewage overflow. A primary example is the Benthemplein water square, which functions as a public plaza during dry weather but can hold 1.7 million liters of rainwater during storms. By utilizing permeable paving, green roofs, and bioswales, architects redistribute the responsibility of water management across the city surface. This requires a shift in architectural focus toward edge conditions and thresholds where the building meets the shifting water table.

Acceptance Through Floating and Amphibious Architecture

The most radical shift in perspective involves removing the requirement for solid ground altogether. The acceptance model embraces water as the site's permanent state, leading to the development of floating structures like the Floating Office Rotterdam. Built on concrete pontoons, these structures rise and fall with the tides, incorporating flexible utility connections and thermal energy systems derived from the surrounding water. Beyond fully floating buildings, amphibious structures are designed to rest on the ground but become buoyant during flood events. This strategy forces architects to rethink structural weight distribution, as buoyancy—not just gravity—becomes a primary design constraint.