Context

Meristem Design worked with Hounslow Council to transform the entrance of Isleworth Bowling Club with a series of hybrid SuDS rain planters - an innovative new product that combines the functionality of rain gardens with the flexibility of above-ground systems. The ground-level planters combine rainwater management with biodiverse planting to deliver a greener, more welcoming gateway into the park.

Challenge

The expansion of urban infrastructure has made below-ground space increasingly complex and utility services and hard surfacing often prevent the installation of traditional rain gardens. At the park, ground conditions restricted excavation depth, ruling out a standard rain garden approach.

Solution

Meristem’s Hybrid SuDS Planters were installed as a series of ground-level, partially submerged units, each sunk 200mm into the ground. The planters feature a Hydrorock base layer that provides subsurface water storage and attenuation. Outer edges of the planters were finished with 10mm shingle, ensuring a seamless interface for surface water flow.

How does it work?

  1. Capture: rainwater flows into the planter through inlets or from nearby paved surfaces.

  2. Storage: the Hydrorock layer at the base holds the rainwater for a short time, stopping it from running off too quickly.

  3. Capillary rise: the stored water slowly moves up through the soil, keeping the plants watered.

  4. Gradual release: Any extra water either evaporates or drains slowly back into the local system.

Outcome

The Isleworth Bowling Club Hybrid SuDS Planter project represents an innovative approach to sustainable urban drainage. The design of the rain garden SuDS planters provides a different and effective way of managing rainwater. By digging into the ground, but using a typical planter design, the hybrid SuDS demonstrates a new way of integrating sustainable drainage systems.

Surface water is captured, stored and released gradually through the Hydrorock system, reducing the likelihood of localised flooding and easing demand on the sewer network.

The planting scheme supports pollinators, adds habitat variety, and contributes positively to the local ecosystem.

The colourful, well-designed planters create a more welcoming and distinctive entrance, improving the experience for visitors and users of both the park and community facilities.