Bewerkt Fuiken plaatsen in de Oostvaardersplassen   Foto Joep de Leeuw KLEIN
Water matters
connecting science & practice
e-magazine edition 21 | december 2025

A variety of potential strategies is investigated by the Dutch government to prepare the Netherlands for long-term sea level rise. This edition of Water Matters discusses one of these strategies from a financial-economic perspective. Central question is: what are the economic consequences if citizens and businesses retreat from low-lying to high-lying areas of the Netherlands?You will also find six other studies on a variety of topics, ranging from connecting wetlands to open, deeper water to new insights into effluent reuse.
Water Matters is published by H2O media with support from partners Deltares knowledge institute, KWR Water Research Institute,  consulting and engineering firm Haskoning, and STOWA (The Foundation for Applied Water Research).

Zeeland, watersnoodramp 1953   Foto ANP, collectie Spaarnestad, Nationaal Archief
An analysis of the costs of hybrid ‘accommodate’ strategies for adaptation to sea level rise
December 2025

To prepare the Netherlands for sea level rise in the long term, the Sea Level Rise Knowledge Programme has explored different strategies to keep the country safe and habitable: 'protect', 'advance', and combinations of ‘accommodate’ and ‘retreat’.

Foto IJsselmeer innamepunt Andijk recht
Risks for drinking water production due to shifting ecological water quality 
December 2025

Lake IJssel is an important source of freshwater for the production of drinking water in the Netherlands. How climate change affects the ecological water quality of Lake IJssel, and whether this results in increasing ecological risks and challenges for drinking water production, is largely unclear.

Cover beeld irrigation system in function 2025 03 15 08 22 15 utc klein
Regional drought statistics for
water boards based on KNMI'23
climate scenarios
December 2025

Extremes in dry weather will become more common in the Netherlands, according to a new STOWA study. In this study, drought statistics and associated data products are derived to provide water managers with the building blocks for models, measures and policies for their own areas of operation.

Het plaatsen van een visfuik in de Oostvaardersplassen   Foto Hans Erik Kuypers (Staatsbosbeheer)
Richer fish fauna by dynamically connecting wetlands with open water?
December 2025

Shallow riparian zones and wetlands are important spawning and nursery areas for juvenile fish and contribute to a species-rich fish fauna. Because such areas were largely lacking in Lake Markermeer, new nature reserves like Marker Wadden have been created, and the possibility of linking the Oostvaardersplassen to Lake Markermeer is being considered. 

Leaves 7885775 human antithesis Pixabay
Deep adaptation in the water sector – resilience against system shifts
December 2025

Major and sudden changes with a lasting impact are a blind spot for the water sector and society. How can drinking water companies and water authorities continue to do their work when the world is changing so drastically? The ‘Deep Adaptation for the Water Sector’ project is taking the first steps toward greater adaptability to radical system changes.

Water Matchmaker   voorkeursfoto Marianne   Foto Joop van Houdt, Beeldarchief Rijkswaterstaat
Water Matchmaker: guiding the water transition from a systemic perspective
December 2025

As a result of climate change, demographic growth and increasing competition for freshwater resources, the Dutch freshwater supply chain is under pressure. How do we ensure a fair distribution and water quality that meets everyone's needs? How can we oversee the choices we face and the effects of potential measures? The model-based framework 'Water Matchmaker' aims to support the sector in answering these questions.

Openingsfoto Aquaconnect 20241015 142839
AquaConnect: new insights into using effluent from wastewater treatment plants to replenish groundwater resources in high sandy soils in the Netherlands
December 2025

During the very dry summers of 2018, 2019 and 2022, the high sandy soils in the east and the south of the Netherlands suffered from major shortages of groundwater for drinking water production, nature and agriculture. For drinking water company Vitens and the regional water authority ‘Vallei en Veluwe’, the question arose whether supplementing groundwater supplies with effluent from wastewater treatment plants was an option. 

Colophon edition 21

Water Matters is published by the Royal Dutch Water Network and is made possible by Deltares, KWR Water Research Institute, Haskoning, and the Foundation for Applied Water Research  (STOWA).

ADDRESS
Koningskade 40,
2596 AA Den Haag

PUBLISHER
Monique Bekkenutte
(Royal Dutch Water Network)

MANAGING EDITOR
Bert Westenbrink

FINAL EDITING
Nico van der Wel, Jaap Hoeve, Marianne Lankelma

EDITORIAL BOARD
Huib de Vriend (chairman),
Thomas ter Laak, Joachim Rozemeijer, Sigrid Scherrenberg, Michelle Talsma, Jeroen Veraart

DESIGN
Annette Schinkelshoek