Local retention of rainwater to stabilize groundwater levels, provide cool spaces and play areas.
Figure 1. Cross section of the Bluebloqs system's project for Klapwijk.
The Klapwijk district in Pijnacker suffers from ground level subsidence and fluctuating groundwater levels. With a large scale urban renovation project to tackle these problems, the ambition arose to make the district more climate adaptive and better manage stormwater within 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.
Figure 2. Design explaining the parts of the project for the Klapwijk parl in Netherlands.
A feasibility study and concept design both showed that stormwater can be collected via gutters at street level and using drains below ground. Water will be retained in a pond in the area before being treated and stored in the subsoil. During dry periods the water will be re-distributed via drains to replenish groundwater levels. Filtered water will also be used for cooling and for children to play during hot summer days. The drains provide the added benefit that playgrounds are dry soon after heavy rainfall events.
Figure 3. Image of a building with problems of subsidence in the Netherlands.
The feasibility study was conducted in parallel with the development of the spatial strategy plan for renovating the neighbourhood. This made it possible to include our solution early in the planning process. This project is expected to be implemented at the end 2019, early 2020.