Cities in the Netherlands are experimenting with a green approach to urban surfaces by using grass-filled permeable paving blocks in places where traditional sealed concrete or asphalt might otherwise be used. These specially designed blocks contain open spaces where grass can grow, while gaps in the surface allow rainwater to pass through rather than immediately draining off. This approach can help reduce stormwater runoff during heavy rainfall and, depending on local soil conditions, allow water to infiltrate into the ground or be temporarily stored below the surface. Additionally, replacing completely sealed surfaces with vegetation can contribute to a cooler, greener urban environment during hot weather.
Why dutch city Swapping solid concrete for grass-filled paving blocks
Traditional roads, car parks and paved public spaces are largely impermeable, meaning that rainwater cannot easily seep into the soil beneath them. During intense rainfall, large amounts of water can flow rapidly towards drains and sewer systems, increasing the risk of local flooding if drainage capacity is exceeded.The grassy floor offers a different perspective. Sometimes called grass pavers or open-cell concrete blocks, these surfaces have gaps where vegetation can grow and rainwater can pass through. Depending on the design and local soil conditions, water may infiltrate into the ground, temporarily collect in underlying layers or be released more slowly into drainage systems.The Netherlands has long placed water management at the center of urban planning, and climate change is adding new challenges. Heavy rainfall, periods of drought and increasingly hot weather are driving cities to seek ways to better equip neighborhoods to deal with extreme conditions. Replacing redundant sealed surfaces with permeable alternatives is a tool available to urban planners.
Grass-filled floors could help cities cope with heavy rainfall
One of the main benefits of permeable paving is its ability to manage rainwater close to where it falls. Traditional concrete and asphalt surfaces force water to flow away from streets and sidewalks toward drainage systems. When extremely heavy rainfall occurs in a short period of time, these systems can become overwhelmed.Permeable paving can slow this process by allowing some water to pass through the surface. This can reduce the amount and speed of storm water runoff entering the drains simultaneously. Under suitable conditions, some water may also penetrate into the soil below.However, grass paving does not guarantee that all rainwater will immediately seep into the groundwater. Its effectiveness depends on soil permeability, groundwater level, construction methods and maintenance. Some systems are designed to temporarily store water below the surface before slowly releasing it.
Grass and vegetation can help reduce urban heat
The potential benefits go beyond rainfall. Concrete and asphalt can absorb solar energy during hot weather and release stored heat afterward, contributing to the urban heat island effect that can make densely built up areas hotter than their surroundings.Vegetation can contribute to local cooling through evapotranspiration, a process in which plants release water vapor into the atmosphere. So replacing completely sealed surfaces with green alternatives can play a small role in creating more comfortable urban environments.The cooling benefits should not be overstated. Grass paving alone cannot dramatically reduce temperatures across a city. Its contribution is more meaningful when combined with trees, parks, green roofs and other forms of urban vegetation that provide additional shade and cooling.
Part of the broader green and blue change
Grass-filled paving blocks are part of a broader approach often described as green-blue infrastructure. The concept involves integrating vegetation and water management into the design of streets, neighborhoods and public spaces.Instead of treating rainwater as simply requiring it to drain through underground pipes as quickly as possible, cities can create areas that absorb, slow down or temporarily store water. Measures may include permeable surfaces, rain gardens, bioswales, green roofs, ponds and specially designed public spaces capable of capturing excess rainwater.Dutch cities have explored different combinations of these measures according to local circumstances. Together, they can help reduce pressure on drainage networks while adding greenery to densely populated areas.
Not every road can become a grass covered road
Despite their environmental benefits, grass-filled paving blocks are not suitable for every space. Roads with heavy and continuous traffic generally require durable surfaces capable of handling significant loads and repeated wear. Where vehicles continuously pass through the same section, grass may also struggle to survive.For this reason, grass pavers are usually more practical in selected locations such as parking areas, residential spaces, driveways, curbs and other relatively low-traffic surfaces.Maintenance is another important consideration. Open spaces in permeable paving can become blocked with sediment and debris, reducing the amount of water that can pass through. Vegetation also requires suitable growing conditions, while prolonged drought can affect grasses and other plants.
A simple idea with a potentially wide-ranging role in climate-ready cities
Grass-filled paving is not exclusively Dutch, and permeable pavement systems are used in many countries. What makes the Netherlands particularly relevant is its broad emphasis on integrating water management and climate adaptation into everyday urban planning.As cities around the world face increased rainfall, flooding and rising temperatures, reducing unnecessary sealed surfaces could become an important part of urban climate adaptation. Grass-filled paving blocks alone can’t solve flooding or heat stress, but they demonstrate how common infrastructure can be designed to perform multiple functions.A surface can support vehicles or pedestrians while allowing water to pass through and making room for vegetation. When combined with trees, parks, rain gardens, green roofs, and effective drainage systems, such approaches can help make cities greener and potentially cooler neighborhoods, as well as more resilient to extreme weather.