This book explores how integrated management of environmental resources via a nexus approach can help in achieving the respective Sustainable Development Goals (SDGs). It provides conceptual considerations but mainly practical examples on how to implement a nexus approach in cities and multifunctional land-use systems to increase resource use efficiency and develop a low carbon economy. After sketching out the background and conceptual outline, contributions to the book explore key aspects of the nexus implementation. Specifically, they • Demonstrate how to sustainably use organic waste and wastewater for agriculture, • Explore examples on how to manage multifunctional land-use systems including multipurpose reservoirs, • Highlight the importance of economic incentives for successful nexus implementation, and • Provide a comprehensive perspective on challenges and opportunities of implementation, considering peer-to-peer learning, indigenous knowledge, and stakeholder participation. The chapters in this book shed a new light on key aspects of the interrelation between SDGs and the nexus approach in resilient cities and multifunctional land-use systems, and provide specific examples on how to advance sustainable resources management.

This report aims at integrating regional and country experiences and projects with regard to viable groundwater management practices for the future. It compiles and translates best available present scientific and technical knowledge on groundwater resources and their governance, which is often highly specialized, into simpler language and synoptic representations, accessible to a large public of policy and decision makers across development sectors. It serves as a technical basis for the visioning process, and for the definition of the Framework for Action on groundwater governance.This is one of 3 outputs of project GCP/GLO/277/GEF expected to be published under the names of its 5 partner organizations and widely circulated to policy and decision-makers in countries, as well as other stakeholders of groundwater governance and practionners around the world. This outputs provides the technical basis for the other two: A Global Vision for Groundwater Governance 2030 and Global Framework for Action to Achieve the Vision on Groundwater Governance.

Recent years have seen a paradigm shift in our understanding of groundwater–surface water interactions: surface water and aquifers were long considered discrete, separate entities; they are now understood as integral components of a surface–subsurface continuum. This book provides an overview of current research advances and innovative approaches in groundwater–surface water interactions. The 20 research articles and 1 communication cover a wide range of thematic scopes, scales, and experimental and modelling methods across different disciplines (hydrology, aquatic ecology, biogeochemistry, and environmental pollution). The book identifies current knowledge gaps and reveals the challenges in establishing standardized measurement, observation, and assessment approaches. It includes current hot topcis with environmental and societal relevance such as eutrophication, retention of legacy, and emerging pollutants (e.g., pharmaceuticals and microplastics), urban water interfaces, and climate change impacts. The book demonstrates the relevance of processes at groundwater–surface water interfaces for (1) regional water balances and (2) quality and quantity of drinking water resources. As such, this book represents the long-awaited transfer of the above-mentioned paradigm shift in understanding of groundwater–surface water interactions from science to practice.