Replicability and pathways for the scaling of nature-based solutions for water treatment: Examples from the Philippines, Sri Lanka, and Vietnam

TThe importance of nature-based solutions (NbS) for urban water treatment is growing due to their cost-effectiveness and the multitude of ecosystem services they offer, contingent on appropriate design and meticulous implementation. Drawing upon the experiences of a project that assessed the effectiveness of a set of NbS solutions in South and Southeast Asia, namely, constructed wetlands in the Philippines, constructed floating wetlands in Sri Lanka and Vietnam, and green roofs for water treatment in Vietnam, this chapter explores possible approaches to and pathways for the scaling of those solutions. Specifically, it discusses the results of targeted efforts aimed at supporting the replication of those technologies in different locations and contexts and other possible pathways for scaling that have emerged in the course of the implementation of the project.