waterdoorlatend

Waterdoorlatend translates to water-permeable. In civil engineering and construction, it refers to materials and surfaces that allow water to pass through, either by infiltrating the soil or by draining through an integrated layer. The main aim is to manage rainfall at the source, reducing surface runoff and aiding groundwater recharge.

Common materials include porous asphalt, pervious concrete, permeable interlocking concrete pavers with joints filled by aggregate, and open-graded surfaces using crushed rock. Some systems combine a permeable surface with a drainage layer beneath to store infiltrated water for gradual release.

Performance depends on the surface infiltration rate and the permeability of the underlying subsoil. Infiltration rates are specified by local or national standards. Over time, surfaces can become clogged with sediment, reducing effectiveness; regular maintenance such as vacuum sweeping and occasional cleaning is typically required.

Benefits include reduced runoff peaks, lower drainage infrastructure needs, groundwater recharge, and potential mitigation of urban heat island effects. Limitations include reduced load-bearing capacity if not properly engineered, vulnerability to clogging, and the need for suitable sub-base design and ongoing maintenance; frost action can also affect performance in cold climates.

Common applications are parking lots, driveways, sidewalks, pedestrian zones, and landscape features, as well as certain road sections where stormwater management is prioritized.