Mapping Existing NbS for Water Treatment in the Philippines, Sri Lanka, and Vietnam

A growing number of easily accessible maps are capturing the knowledge on nature-based solutions (NbS) for urban development. However, existing examples from Asia included in those maps are limited and not necessarily focused on water. Existing scientific research on NbS in Asia is focused on case studies, and no readily available database allows for meta-analysis, which is important for advancing the understanding of their effectiveness and potential for replication in different contexts. Further, many existing cases are not documented in the academic literature, especially ones implemented by civil society and local government agencies. Even the ones documented through academic research are often not widely accessible throughout the regions since they are often not available to public access and are sometimes published in local languages. Thus, this chapter aims to provide two approaches to map existing NbS focusing on water management, with NbS for water case studies in Sri Lanka, the Philippines, and Vietnam, which are Google Maps and Geographic Information System (GIS). Thus, stakeholders can easily identify the locations of NbS structures for water and wastewater management, which will be one of the key factors in adopting NbS.