Volunteered information on nature-based solutions — dredging for data on deculverting

Much has been written about the potential contribution of citizen-science approaches to further urban environmental sustainability, and associated interventions such as nature-based solutions (NBS). Engagements between researchers and stakeholders relying on bottom-up information provision, for instance community mapping, are often purported to play a vital role in developing shared knowledge, achieving greater impact and stimulating innovation. However, relatively few studies within the realm of NBS have reported on experiences in using volunteered information, or their results. This reflects an important gap, not least because of the proliferation of proposals and bids that rely upon or integrate such methods into their approach. We report on experiences with gathering information using a ‘bottom-up’ map-based wiki tool, which effectively sought to crowd-source data, contributed by members of the public and

professional stakeholders. As we approach the milestone of ‘10 years on’ from the inception of the website www.daylighting.org.uk, we reflect on our approach, the opportunities presented, constraints encountered,

progress made and results delivered. This is contrasted with other resources and data-gathering projects having similar aims for different urban NBS. Findings are presented on the substantive issue of the uptake of deculverting as a particular form of NBS, including land-use contexts, scheme costs and achievement of stated objectives. Reflections are given on potential contributions of such methods in relation to other, more established approaches and new techniques in urban knowledge co-production