Gijsbert Cirkel MSc PhD

Principal scientist

030-6069734
Gijsbert.Cirkel@kwrwater.nl
06-20614497

Energy Grass Project – Water-Resilient Natural Grass for Sports Fields

The managers of sports complexes face major challenges. The chemical control of pests and weeds has been phased out and the leaching of fertilizers has to be reduced.…

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The role of sludge in infiltration ponds in OMP removal during dune infiltration

Drinking water utilities that use dune infiltration or riverbank filtration employ infiltration ponds with a sludge layer. This project investigates the role played by the thickness and conditions…

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Exploration of sources, behaviour and risk of new substances

At present, the count for substances with a CAS number stands at over 194 million. New substances are being registered, produced and applied at a rapid pace. The…

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Drought monitoring: youngsters join in

An exceptional citizen science study will be conducted this summer, with participants building their own sensors and measuring drought in their gardens. The measurements will be used to give advice about watering.…

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Future water use and peak factors under climate change

According the prognoses of the Royal Netherlands Meteorological Institute (KNMI), weather extremes, such as heat and drought, will become more frequent and long-lasting. Peaks in water consumption will…

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Incorporation of soil nutrients and acidity into PROBE

The vegetation composition in freshwater natural ecosystems can be explained on the basis of the soil moisture, nutrient fertility and acidity. A reliable assessment of how the vegetation…

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Groundwater infiltration and recharge: what we know

17 June 2025 — KWR experts discuss the past, present and future of groundwater recharge and replenishment: one of the ways to…

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News

Water sector benefits from considering more extreme climate scenarios

27 November 2023 — Climate scenarios set out a clear direction but they do not describe all relevant and plausible possibilities. So…

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News

Mannoury blue-green energy roof wins 2022 Roof of the Year award

29 March 2023 — Roof of the Year: housing project Mannoury (Amsterdam), where TKI project Urban PhotoSynthesis provides integrated solutions for the…

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Water Sector

World’s coolest artificial grass pitch in Amsterdam

27 September 2019 — On Wednesday, 25 September, TKI CitySports introduced the world’s coolest artificial grass playing field on the Laan van…

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SmartRoof 2.0 installed at Polypipe Terrain, Aylesford, UK

25 January 2019 — Following the successful launch of the first SmartRoof project in Amsterdam (www.projectsmartroof.nl) in 2017, we transformed a second…

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News

Cool heads and dry feet thanks to blue-green roof

01 November 2018 — At the annual National Delta Congress, outgoing Delta Programme Commissioner, Wim Kuijken, shined the spotlight on Smartroof 2.0.…

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Water Sector

Innovative blue-green roof cools the city and prevents flooding

08 September 2017 — On Friday, 8 September, the innovative, blue-green SmartRoof 2.0 was opened at the Marineterrein in Amsterdam. The hot,…

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Energy Grass Project – Water-Resilient Natural Grass for Sports Fields

The role of sludge in infiltration ponds in OMP removal during dune infiltration

Exploration of sources, behaviour and risk of new substances

Drought monitoring: youngsters join in

Future water use and peak factors under climate change

Incorporation of soil nutrients and acidity into PROBE

Variatie in bosdichtheid: een belangrijke bron van onzekerheid in regionale grondwatermodellen

Bodemfysisch onderzoek vezelversterkte natuurgrasvelden

Bosverdamping - verkennende metingen en groeiringen als proxy voor droogtestress

Spatial variability of hydraulic conductivity of the Cretaceous aquifer in Belgium

Verkennende berekeningen naar de microbiologische risico’s van lekke stijgbuizen en waarnemingsbuizen in winputten voor de drinkwaterproductie

Climate proof playing conditions on urban soccer fields

Bijlage - Verantwoord infiltreren en aanvullen van grondwater. Toe te passen schema’s van het raamwerk verantwoord infiltreren en aanvullen

Verantwoord infiltreren en aanvullen van grondwater. Een praktisch raamwerk voor infiltreren en aanvullen met zorg voor de grondwaterkwaliteit

Groundwater infiltration and recharge: what we know

Water sector benefits from considering more extreme climate scenarios

Mannoury blue-green energy roof wins 2022 Roof of the Year award

World’s coolest artificial grass pitch in Amsterdam

SmartRoof 2.0 installed at Polypipe Terrain, Aylesford, UK

Cool heads and dry feet thanks to blue-green roof

Innovative blue-green roof cools the city and prevents flooding