Active groundwater management in Klapwijk

Active groundwater management in Klapwijk


Using rainwater for active groundwater management in Klapwijk, Pijnacker-Nootdorp.

STATUS: Feasibility Study

APPLIED SOLUTION: Stable groundwater levels

CLIENTS: Municipality of Pijnacker-Nootdorp, Waterboard Delfland

PARTNERS: Wareco Engineers, KWR Water

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Keeping rainwater in the neighbourhood for stable groundwater levels, cooling and playing.



The Klapwijk district in Pijnacker suffers from subsidence and fluctuating groundwater levels. With the planned large scale urban renovation to tackle these problems, the ambition rose to make the district more climate adaptive and to manage stormwater within the municipal borders. Relevant in this context is that Klapwijk is located at the back of the regional water system: the supply and discharge of freshwater is delayed.


The feasibility study and concept design both shows that stormwater can be collected via gutters at street level and drains below ground. The water is retained in a pond in the parks before it is treated and stored in the subsoil. At dry periods the water is via drains distributed to replenish the groundwater levels. The filtered water will also be used for cooling and for children to play during hot summer days. Beneficial of the drains that playgrounds are soon be dry after heavy rainfall.


The feasibility study was conducted parallel to the spatial strategy for the renovation of the neighbourhood. This made it possible to include our solution early in the renovation and planning process, integrated within the spatial plan which is currently being further developed towards a public tender process and implementation.


Retention pond




Infiltrated water


Reused water


Field Factors, project Klapwijk, active groundwater management

In less than 30 years, subsidence has affected all te urban infrastructure and installations, such as sewage, electricity and gas pipes.


Close monitoring of the pilot will give insight in the effects of our system on reducing subsidence, by using the stored stormwater for active groundwater management.

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This project is expected to be implemented at the end 2019, early 2020.