MULTISOURCE Deliverable 4.4. Nat4Wat: technology selection tool, prototype complete

Nature-based solutions (NBS) have gained prominence as sustainable approaches to urban water management, addressing critical challenges like wastewater treatment and stormwater management while offering additional environmental and social benefits. One of the key advantages of NBS is their role in decentralizing urban water management, allowing cities to distribute water treatment and storage systems across different locations, reducing pressure on traditional centralized infrastructure. However, the diverse range of available NBS options, each suited to different contexts, presents a significant challenge for decision-makers. The Nat4Wat decision-support system (DSS) was developed to aid in navigating this complexity by assisting stakeholders in selecting, comparing, and evaluating NBS options for wastewater treatment and stormwater management. Through the integration of multicriteria decision analysis (MCDA), Nat4Wat evaluates various factors—such as cost-effectiveness, environmental performance, operational requirements, and social benefits—to guide users toward the most appropriate and sustainable NBS for their specific context. This document details the development of Nat4Wat and presents the dissemination strategy designed to increase the impact of the tool within and beyond the MULTISOURCE project. The goals of the dissemination strategy are to increase the number of users as well as the number of companies providing market cases. It includes activities such as social media campaigns, ambassadors and demonstrations in conferences and bilateral meetings with companies and potential users.