Stadium pitch for highest Dutch football league

The Permavoid 85Sport system, installed in three compartments under the field, captures rainwater as it falls and makes it capillarily available to the natural grass. This layer under the entire playing field ensures optimal drainage and also serves as a water buffer, with a capacity to store more than 600m³ of water. When the grass needs water the Permavoid 85Sport system, through the use of capillary cones and capillary geotextile, passively provides water from below in a natural way. The system also includes an air layer, which, together with the available water, creates optimal growth conditions for the pitch.

The Permavoid system is further equipped with an air duct around the playing field. This air duct is connected to both the Permavoid system under the field and two fans. These fans can create slight positive or negative pressure if desired. During heavy rainfall, negative pressure shortens the reaction time for drainage and speeds up the actual draining process. In the event of water demand by the pitch, the capillary action can be enhanced by applying slight positive pressure. Additionally this function, combined with the existing air layer, helps to quickly warm the field at low temperatures and reducing heat loss to the subsoil. This results in significantly lower energy consumption, leading to cost savings.