Assessing the contribution of domestic gardens to urban ecosystem services

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This project will provide a novel citizen science approach to collecting and interpreting data about domestic gardens in order to co-develop an action plan with project partners to prioritise greening solutions within and beyond domestic gardens. Domestic gardens offer a valuable source of green infrastructure (GI) within an urban environment. They are important patches of greenspace that can provide connectivity between larger areas of GI (parks, recreation grounds etc), therefore improving the functioning of ecosystems and the services they provide, such as reducing surface water runoff thereby reducing flood risk, and lowering urban temperatures. While individually, a domestic garden may appear insignificant, collectively domestic gardens contribute up to 30% of greenspace within the urban matrix, which becomes especially important at the city scale. In spite of this, the quantity and quality of green infrastructure provision by domestic gardens is not well-evidenced. This has implications for the future resilience of an urban environment and the health and well-being of its citizens. Current data over-estimates the amount of vegetation within private gardens, which leads to subsequent inaccuracies in environmental model outputs (e.g. surface water runoff in an extreme rainfall event), and in the identification and prioritisation of areas of GI need, inhibiting effective action on-the-ground. Furthermore, the general public are often unaware of the environmental value of their own private garden and how they can improve it.This project will address these issues directly by:1. Inviting city residents to complete an online survey about their own garden, the results of which will be amalgamated to create maps of domestic garden greenspace both in terms of quantity and quality. Survey respondents will be given a score for the environmental quality of their garden based on their responses to the survey, together with some information as to how their garden could be improved in relation to biodiversity, climate regulation and improving air quality.2. Validating the survey responses using high resolution satellite data. The combination of the satellite data with the survey responses will be used to establish a classification scheme for different garden types, which can then be extrapolated to the wider city area.3. Modelling how the vegetation within a domestic garden impacts surface runoff, temperature reduction and air quality. This will be done across multiple scales, from an individual garden to the neighbourhood-level and eventually at the city-scale.4. Developing an action plan for GI solutions within the city based on the findings from the previous objectives and existing, larger-scale, green infrastructure datasets.Manchester is the test city for this project; the proposal has been developed in partnership with Manchester City Council, Red Rose Forest, Southway Housing, Lancashire Wildlife Trust and additional members of the Manchester a Certain Future Green Infrastructure Strategy Group (Environment Agency, BDP, Groundwork, National Trust). The project outputs will allow these end-users to develop a more robust plan for GI under current and future climate scenarios. Consequently, project outputs will contribute to enhancing the quality of life for the local population and to improving the resilience of the Manchester City environment. Further impact will occur at the individual level (improving individual gardens based on the survey feedback, strengthening community cohesion), neighbourhood-level (the evidence created can be used for biodiversity/GI/ES offsetting for new housing developments, housing associations will use the project outputs for improving neighbourhoods and access to green space) and stakeholder-level (private developers can use the outputs to add value to residential areas and development, third sector organisations can use the maps for developing policy recommendations and actions).