Permavoid installed beneath rain gardens forms a lightweight, high‑strength sub‑base that creates a stable underground reservoir. This hidden storage boosts water availability for planting, delivering upward irrigation that helps vegetation stay healthy through dry spells.
Permavoid rain gardens: Smarter, more resilient water management
Managing Water at the Surface
Permavoid’s modular design promotes natural water movement, allowing rainfall to infiltrate the ground more effectively and enabling greener, more sustainable stormwater management in paved settings.
When built beneath rain gardens, this engineered layer transforms them into fully integrated SuDS features that help cities evolve into more resilient, “sponge‑like” environments.
By retaining and slowly releasing water within the landscape instead of pushing it immediately into traditional pipes, Permavoid reinforces nature‑based solutions in dense urban areas. The result is reduced runoff, less strain on existing infrastructure, and greater community resilience in the face of more frequent and intense rainfall.
How Do Rain Gardens Work?
Making A Positive Impact
Designers can easily deliver biodiversity net‑gain by incorporating rain gardens into their schemes. Permavoid rain gardens fit effortlessly into even the smallest urban spaces, creating habitat-rich pockets of planting that boost biodiversity and support pollinators, strengthen ecological networks, and introduce native vegetation into even the most urbanised spaces. By naturally cooling the surrounding area through evapotranspiration and added green cover, they also help reduce urban heat and make cities more climate‑resilient.
