Cardiff Greener Grangetown

The project introduced 108 raingardens containing native trees and plants to improve water quality. The rain gardens and tree pits acted as bioretention systems. The Greener Grangetown initiative removed an average of 40,000m3 of surface runoff from the combined sewer system annually. The design also considered the local community's needs, such as parking availability and litter management.

The project transformed the public realm, environment, and transport infrastructure. It provided multiple benefits, including water management, regeneration, and the transformation of a busy cycle route. The project performed well during extreme weather conditions, demonstrating efficiency in reduced operational costs and environmental benefits.

1. SuDS can be delivered anywhere: Despite challenges like utilities, limited free space, topography, and existing infrastructure, SuDS solutions can be engineered.
2. Materials and products: There's a need for more 'off the shelf' products tailored for rain garden features.
3. Pre-construction phase and Contract type: Early involvement of all stakeholders is crucial. The type of contract used posed financial challenges due to the retrofit nature of the project.
4. Community engagement and communication: Engaging the community is vital for retrofit projects. The community's feelings and participation are key indicators of a project's success.

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Research is being conducted to analyse water quality improvements, with a focus on microplastic removal. Cardiff University is also researching the health and wellbeing benefits to the community from an improved local environment.