With the increasing population and accelerated urbanization, demands for water are rising for different sectors around the world, including in South Asia. Integrated water resource management (IWRM) offers a promising potential to address multifaceted water demands. This study therefore aimed to address this issue by (i) reviewing key issues related to water, land, and food in South Asian countries, (ii) exploring the prevalent irrigation management strategies in those countries, and (iii) examining the IWRM situation based on a Nepalese case study, and it proposes some options to support effective implementation of IWRM. South Asia, the home to 24% of the world's population with only 15% and 7% of the world's arable and permanent crop land and water resources, respectively, is the worst-affected region in the world from undernourishment. Surface irrigation is the dominant irrigation application method in the region, which incurs high water losses due to the lack of flexible water control structures in canal networks. The Nepalese case study revealed a lack of clear institutional arrangements to implement IWRM and disparate and conflicting views about IWRM. Creation and strengthening of basin-level water user organizations, technological improvements, and awareness-raising activities are some potential ways forward to implement IWRM.

Water, energy, and biodiversity are essential components for building a sustainable food system in a developing country like Nepal. Green Revolution technologies and the package of practices largely ignored the role of ecosystem services, leaving a large population of small farmers’ food- and nutrition-insecure. Biodiversity, especially, agrobiodiversity is in decline and this vital cross-cutting element is less discussed and interlinked in nexus literature. The interlinking food system with water–energy–biodiversity nexus, therefore, is essential to achieve a resilient food system. It ensures the vital structures and functions of the ecosystem on which it is dependent are well protected in the face of increasing socio-economic and climatic stress. This paper reviews the food system of Nepal through the lens of the food–water–energy–biodiversity (FWEB) nexus to develop a more robust food system framework. From this approach, food system foresight can benefit from different nature-based solutions such as agro-ecosystem-based adaptation and mitigation and climate-resilient agro-ecological production system. We found that the FWEB nexus-based approach is more relevant in the context of Nepal where food and nutrition insecurity prevails among almost half of the population. Improvement in the food system requires the building of synergy and complementary among the components of FWEB nexus. Hence, we proposed a modified framework of food system foresight for developing resilience in a food system, which can be achieved with an integrated and resilient nexus that gives more emphasis to agro-ecological system-based solutions to make the food system more climate resilient. This framework can be useful in addressing the Sustainable Development Goals (SDGs) numbers 1, 2, 3, 6, 13, and 15 and can also be used as a tool for food system planning based on a broader nexus.

Majority of landlocked mountainous countries are poorly ranked in Human Development Index (HDI), mostly due to poor per capita agriculture production, increasing population, unemployment, expensive and delayed transportation including several other factors. Generally, economy of such countries substantially relies on subsistence agriculture, tourism, hydropower and largely on remittance etc. Recently, it has been argued that to utilize scarce suitable land efficiently for food production, poor inland transport, hydropower, irrigation, drinking water in integration with other developmental infrastructures, an overarching policy linking water - energy – food nexus within a country for combating water, energy and food security would be most relevant. Thus, in present paper it has been opined that promotion of such linkage via nexus approach is the key to sustainable development of landlocked mountainous countries. Major land mass in mountainous countries like Nepal remains unsuitable for agriculture, road and other infrastructure profoundly imposing food, nutrition and energy security. However, large pristine snowy mountains function as wildlife sanctuaries, pastures, watershed, recharge areas for regional and global water, food and energy security. In return, landlocked mountainous countries are offered certain international leverages. For more judicious trade off, it is recommended that specific countries aerial coverage of mountains would be more appropriate basis for such leverages. Moreover, for sustainability of mountainous countries an integrated approach enabling water - energy – food nexus via watershed-hydropower-irrigation-aquaculture-agriculture-integrated linking policy model is proposed. This model would enable protection of watershed for pico, micro, and mega hydro power plants and tail waters to be used for aquaculture or irrigation or drinking water purposes for food and nutrition security.

Urbanisation will be one of the 21st century's most transformative trends. By 2050, it will increase from 55% to 68%, more than doubling the urban population in South Asia and Sub-Saharan Africa. Urbanisation has multifarious (positive as well as negative) impacts on the wellbeing of humans and the environment. The 17 UN Sustainable Development Goals (SDGs) form the blueprint to achieve a sustainable future for all. Clean Water and Sanitation is a specific goal (SDG 6) within the suite of 17 interconnected goals. Here we provide an overview of some of the challenges that urbanisation poses in relation to SDG 6, especially in developing economies. Worldwide, several cities are on the verge of water crisis. Water distribution to informal settlements or slums in megacities (e.g. N50% population in the megacities of India) is essentially non-existent and limits access to adequate safe water supply. Besides due to poor sewer connectivity in the emerging economies, there is a heavy reliance on septic tanks, and other on-site sanitation (OSS) system and by 2030, 4.9 billion people are expected to rely on OSS. About 62–93% of the urban population in Vietnam, Sri Lanka, the Philippines and Indonesia rely on septic tanks, where septage treatment is rare. Globally, over 80% of wastewater is released to the environment without adequate treatment. About 11% of all irrigated croplands is irrigated with such untreated or poorly treated wastewater. In addition to acute and chronic health effects, this also results in significant pollution of often-limited surface and groundwater resources in Sub-Saharan Africa and Asia. Direct and indirect water reuse plays a key role in global water and food security. Here we offer several suggestions to mitigate water and food insecurity in emerging economies.

This position paper advocates for the integration of the water, energy, food and ecosystem (WEFE) nexus approach into Nepal’s policy and planning processes. By doing so, it aspires to foster a development trajectory that is sustainable, inclusive, equitable and responsive to the needs of all citizens, particularly the vulnerable and marginalized groups, against a backdrop of accelerating climate change and resource interdependencies. The main contents of the paper are summarized below. Understanding the WEFE nexus: The WEFE nexus represents a holistic approach to managing interconnected natural resources essential for human well-being and environmental sustainability. This approach involves the management of water, energy, food and ecosystems in an integrated manner to enhance security and efficiency across these sectors. It aims to increase resource efficiency, minimize trade-offs, bolster synergies and improve governance, keeping in view the interdependencies of these sectors. It emphasizes a shift from a focus on particular resources to a systems perspective that prioritizes comprehensive resource security and environmental protection. It advocates for people-centric solutions that are driven by demand-led technological and market innovations. Nexus thinking is essential to balance competing interests in the water, energy and food sectors while maintaining ecosystem health. In Nepal’s context, the integration of the political and social dimensions of the WEFE nexus determines who controls and accesses natural resources. The WEFE nexus approach, integrated with gender equality and social inclusion (GESI) and livelihood considerations, is vital to supporting the economically poor and socially marginalized sections in Nepal who are reliant on natural resources. Importance of the WEFE nexus approach in Nepal: In Nepal, the concept of the WEFE nexus is in its developmental stage but is highly pertinent due to worrying trends that are adversely affecting human well-being and the environment. Nepal faces varied challenges, including water scarcity, unpredictable and extreme environmental events and rising demand for energy and food, all of which underscore the need for a strategic and integrated approach to resource management. This paper argues that the WEFE nexus approach is imperative for Nepal, for several reasons. These include the interconnectedness of resource systems and recognizing and managing the interdependencies among water, energy, food and ecosystems; Nepal’s climate change vulnerabilities and enhancing resilience against climate-induced risks; global commitments in alignment with international obligations and sustainable development goals (SDGs); resource governance and achieving equitable and efficient resource management; and cross-sectoral climate impacts, and hence the need to address the comprehensive effects of climate change on resources. Essentially, the WEFE nexus needs to be promoted in national policies, plans and strategies to ensure sustainable development. Purpose and rationale of this position paper: This position paper seeks to provide a roadmap for all stakeholders, including policymakers, researchers, and international development partners, by (i) offering a critical overview of the WEFE nexus approach; (ii) proposing a practical WEFE framework tailored for Nepal, considering GESI and livelihood perspectives; and (iii) suggesting strategies for improved governance through enhanced coordination and collaboration between different sectors, thereby optimizing resource use and conserving ecosystems. Nepal’s political, economic and social context: Nepal’s transition to a federal polity has introduced and accompanied a number of significant shifts in the socio-economic context that impact the WEFE sectors. These shifts include demographic, social and economic changes; urbanization; migration; and societal challenges such as youth unemployment, gender inequality and social exclusion. These elements form the backdrop against which the WEFE sectors operate, emphasizing the need for a nuanced understanding of their interconnections and effects. WEFE policies and institutional context in Nepal: For Nepal to effectively implement the WEFE nexus approach, there is a need for improved policy coherence, inter-sectoral collaboration mainly between the WEFE sectors and a commitment by all stakeholders to integrating GESI considerations in their activities. Addressing these challenges requires a concerted effort from all stakeholders, including policymakers, development partners and the community at large. The recognition of the WEFE nexus within Nepal’s policy and legal frameworks is an ongoing process. Despite policy commitments and some progress in integrated approaches, varied challenges persist due to fragmentation and compartmentalization of the management of natural resources and disconnected policies in water, energy, food and forest resources. The lack of synergy, collaboration and adequate investment further complicates the execution of nexus-oriented programs.

This paper describes tools and lessons learned in operationalizing the principles of good local water governance and mult ple- use water services for food security in mid- and far-western Nepal. In these poor, water-scarce and food-insecure regions, the Rural Village Water Resources Management Project has shown that integrated water resources management for both blue and green water is a must. Water use master plans (WUMPs) and a participatory step-by-step approach, both backed up by a gender equality and social inclusion (GESI) strategy, ensure appropriate and fair use of scarce water resources. Multiple-use water services (MUS) maximize livelihoods opportunities in a difficult environment.

As befits a CGIAR Challenge Program , the CPWF has welcomed a wide range of stake holders and partners in accord with their ability to achieve program goals. Decision on research investments (project selection) have been based on a competitive grants in which proposal quality was evaluated by an interdependent external panel. The usual weakness of a competitive grants approach - lack of coherence in research agenda has been address by Basin Focal Projects and synthesis research.

A case study in the Solukhumbu region in northern Nepal reveals that the high number of seasonal tourists—which has doubled in 20 years—has led to growing water, food, and energy demands that have modified agropastoral practices and the use of local resources. This has induced new patterns in the movement of goods, people, and animals in the Everest region and the reconfiguration of the water–energy–food nexus. We use this concept of nexus to analyze ongoing interactions and transformations. Key changes involve (1) massive imports of consumer goods; (2) use of local resources with new techniques (hydropower plants, improved mills, greenhouses, and pipes for domestic networks) that depend on imported materials, which are newly accessible to Sherpas as a result of economic benefits generated by tourism; (3) commodification of local resources (water, hydropower, vegetables, fodder, and flour); (4) an increasing number of electrical appliances; and (5) new uses of water, especially for tourist-related services, including hot showers, watering of greenhouses, bottling of water, and production of electricity for cell phones, rice cookers, and other electric appliances. These new uses, on top of traditional ones such as mill operation, compete in some places during spring when water supplies are low and the tourist demand is high. A transfer of pressure from one resource (the forest) to another (water) has also resulted from the government ban on woodcutting, incentives to develop hydropower, and the competition between lodges to upgrade their amenities by offering better services (such as hot showers, plugs to recharge batteries, internet connections, and local vegetables). Our research finds that water is now central to the proper running of the tourist industry and the region's economy but is under seasonal pressure.