The site was used to test the safety and design of major hydraulic projects, including the Delta Works and the Port of Rotterdam.
The 'Deltaflume' was the world's largest water wave flume when it was constructed, allowing for full-scale model testing.
Engineers at the site used scale models to calculate how sea currents and tides would affect actual harbor constructions globally.
Waterloopbos is officially designated as a Rijksmonument (National Heritage Site) due to its scientific and historical value.
Many structures, such as the scale model of the Bangkok harbor, are now permanently flooded or overgrown, creating an unusual micro-ecosystem.
The laboratory was closed in 1996 when computer modeling replaced the need for large physical hydraulic simulations.
In 2018, the art installation 'Paviljoen' was added, which is a modular structure designed to slowly degrade and disappear into the environment over time.
Waterloopbos is a former hydraulic engineering laboratory located in the Noordoostpolder, where scale models of international water projects were tested between 1950 and 1996. The woodland now contains the decaying concrete remnants of these experimental hydro-structures, including models of the Port of Rotterdam and various international harbors. It is managed by Natuurmonumenten and functions as a monumental open-air exhibition of engineering history reclaimed by forest growth. The site features a mix of artificial canals, dams, and locks that have been partially submerged or overgrown by spontaneous vegetation. Visitors follow marked walking trails that wind through the ruins and the surrounding forest landscape. The area serves as both a site for historical industrial heritage and a protected nature reserve. Some experimental structures, like the Delta Flume, are integrated into the path network. The terrain is flat, characteristic of the drained land of the Flevoland province.
The Delta Flume basin, where the massive concrete walls provide a dramatic contrast against the reflecting water.
Wear waterproof walking shoes, as the paths near the water structures can be muddy or uneven.
Bring insect repellent during the summer months, as the forest environment near the canals attracts mosquitoes.
Follow the colored pole routes to ensure you do not miss the hidden concrete scale models tucked away from the main paths.
Do not attempt to climb on the deteriorating concrete ruins, as they are fragile and unstable.
Open year-round, but specific sections of the trails may be periodically restricted for maintenance of the heritage structures.
Stay on the marked paths to protect the sensitive vegetation and the aging industrial ruins.
