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Emerging climate-development processes jeopardize water supply, especially in the Global South. In the Vietnamese Mekong Delta, disrupted water flows driven by climate change and hydropower development have caused water scarcity, threatening agricultural systems in both upstream and coastal areas. Based on insights from desk reviews, stakeholder workshops and interviews with local informants, this paper argues that while grey (engineered) solutions take precedence in addressing water scarcity, securing water sustainability (water retention) for agricultural resilience demands integrated 'grey–green' (engineered-nature-based) solutions. This paper suggests demands for translating this approach into the water governance framework for the delta's agricultural development. [ABSTRACT FROM AUTHOR]

The article discusses the global water crisis and the unsustainable management of water resources. It highlights the increasing frequency and duration of extreme hydrometeorological events due to climate change. The lack of long-term political priority given to water management by policymakers is identified as a major problem. The article also emphasizes the importance of sustainable groundwater management and the need for policies to reduce the decline of groundwater levels and contamination. The negative consequences of unregulated groundwater extraction in countries like the United States and India are discussed. The article concludes by mentioning other papers in the journal that cover various water-related topics. [Extracted from the article]

Multipurpose hydropower reservoirs are regularly framed as water security and climate change solutions. Although multipurpose projects can and do deliver a range of water services, 'win-win' outcomes are not guaranteed. Emerging water and energy risks are altering the net benefits from operating reservoirs to deliver hydropower generation, water supply, flood control, or other purposes. This paper shows that new hydropower governance approaches are needed to efficiently and fairly reallocate water under risks. We demonstrate that dynamic water reallocation is fundamental to the resilience of multipurpose reservoir systems and examine three potential reforms: periodic relicensing, water tariffs, and hydropower sustainability performance bonds. [ABSTRACT FROM AUTHOR]

The effects of climate change on tropical ecosystems cannot be interpreted based on physical variables alone. Severe water shortages and deterioration of ecosystems are most acute in places where historical inequalities occur, such as unequal access to land and other goods and rights necessary for the livelihood of marginalized populations. This paper explores environmental transformations and their repercussions on water resources based on spatial analysis and fieldwork carried out in the Colombian Caribbean. We have engaged with peasant and Afro-descendant populations who have been excluded from water use and now face problems in sustaining their way of life. [ABSTRACT FROM AUTHOR]

Using Mahanadi basin as a case, the study demonstrates benefit-sharing can improve water allocation among riparian states experiencing water stress. The results show the basin having a yearly average water deficit of 5429 million cubic metres (MCM) under business-as-usual which increases to 6781 MCM under high economic growth for 2011–2050. Even after various water supply augmentation and demand management interventions and climate change-induced increased runoff, the upper riparian state continues to have a water deficit. This can be reduced if the lower riparian state allows the upper one to divert 1500 MCM of additional water annually which will require a strong governance mechanism in place. [ABSTRACT FROM AUTHOR]

This study uses the Just–Pope approach to investigate the effects of seasonal weather variables and extremes on the mean yield and yield variability of rice, bajra, chickpea, groundnut and sugarcane in India during the period 1990–2015. Results reveal that changes in rainfall and evapotranspiration across seasons largely affect mean yields for most crops, including bajra, chickpea and groundnut. However, high summer rainfall and low monsoon evapotranspiration extremes reduce groundnut and chickpea yield variability. Considering the importance of water availability to crop yields, this study suggests improving irrigation and water reallocation and management to reduce the severity of seasonal climate effects. [ABSTRACT FROM AUTHOR]

This study is the first to develop food supply and demand projections over the 21st century for Uzbekistan by considering the combined effects of climate change and soil salinization. The study results suggest that rising summer temperatures and soil salinity will considerably reduce wheat production. Projections indicate that a large wheat supply–demand gap will emerge in the midterm, particularly under the SSP3-RCP7.0 scenario. For the two more pessimistic scenarios, supply losses of about 24–29% are expected by the end of the century. Supply–demand gaps of up to 2.7 million tons of wheat would pose serious challenges to national food security. [ABSTRACT FROM AUTHOR]

Based on a desk review and three rounds of the Delphi method, this study examines the impacts of climate change-induced water-related threats on food security in the Indian Sundarbans, and develops management strategies to address the issues. Results show climate change, through its impacts on water, has lowered agricultural output, endangered traditional livelihoods, reduced access to food, and affected food utilization by impacting freshwater availability and creating health hazards. In addition, intensified weather extremes are likely to threaten food security further. A combination of local-level adaptation measures and global-level mitigation initiatives is necessary to ensure food security in this region. [ABSTRACT FROM AUTHOR]

Groundwater is the single largest source of water for irrigation and domestic use in India. Climate change further exacerbates the threat of depletion, reducing food security and increasing the vulnerabilities of resource users. Governance is complicated by externalities associated with its attributes as an invisible and fluid resource which create problems of rivalry and exclusion. Based on theory-based case studies for evaluation of selected World Bank projects, we analyse challenges for groundwater governance and identify factors that contribute to depletion. It highlights the need for integrating and balancing demand and supply-side approaches, including water-efficient irrigation and climate-smart practices. [ABSTRACT FROM AUTHOR]

Semi-arid farming systems in India are facing an increasing frequency of climate change-induced extreme weather events. With the aim of improving their climate resilience, we retrospectively assess climate resilience in two case studies in Maharashtra, India. We considered a 15-year period and multiple interventions in both. The systems showed improved climate resilience when agricultural productivity-enhancing interventions were combined with those related to water management, soil health, livelihood diversification, and food and nutrition security. Further, we recommend embedding a monitoring, evaluation and learning component within the design of all interventions to help with adaptive decision-making. [ABSTRACT FROM AUTHOR]

This study investigates the correlations between Chinese banana farmers' perceptions of integrated water management technology (IWMT) and their adoption behaviours and examines the impact of IWMT adoption on farm performance. The results revealed that farmers' IWMT adoption correlates significantly with their perceptions of whether IWMT adoption can help reduce farm workload, fertilizer and water, the extent to which the technology is easier to operate, and the extent to which the technology can generate higher economic benefits than furrow irrigation technology. IWMT adoption significantly increases banana yields, gross revenue, net returns and irrigation frequency, but does not significantly affect irrigation expenditure. [ABSTRACT FROM AUTHOR]

This study investigates how and to what extent mechanization in land preparation (MLP) can help improve irrigation water productivity (IWP) (measured as rice yield per unit volume of irrigation water). We employed an endogenous treatment regression model to estimate the 2021 China Land Economic Survey (CLES) data collected from Jiangsu province, China. The results reveal that MLP adoption increases IWP significantly; a higher IWP is determined by whether or not farmers adopt MLP rather than through which channel they access their farm machines; the effects of MLP adoption on IWP are monotonically increasing across the selected quantiles. [ABSTRACT FROM AUTHOR]

This study examines the influence of human activities and climate variability on 86 dams and hydropower across Iran. The term 'mirage water' is introduced to estimate the impact of these factors on inflow. Data analysis shows that out of 1729 m3s−1 of mirage water, 705 m3s−1 are contributed by anthropogenic activities and 1024 m3s−1 by precipitation deficits. This indicates that some parts of Iran's strategic investments in water resources management over the past 60 years have failed. The study underscores the necessity for enhanced management practices and infrastructure investments to ensure sustainable water resources in arid and semi-arid regions. [ABSTRACT FROM AUTHOR]

The recurring floods and droughts in the Czech Republic show that climate change requires far-reaching changes in water management. We analyse the responses already reflected in Czech water policy and legislation at three levels: strategic, statutory and constitutional. We first describe the substantial changes that have been satisfactorily introduced into the Czech government's policies. We then trace the far less successful developments in the law, which have so far essentially been limited to drought plans and restrictions on water extraction during droughts. At the core, we concentrate on the political attempts to constitutionalize water protection. [ABSTRACT FROM AUTHOR]

Managing scarce water resources has been central to the Murray–Darling Basin (MDB) regional development story. The article puts water into a broader context of key drivers in development in the MDB. In addition to water markets and water policy, key issues include climate change, the changing relative resilience and viability of urban centres, the role of government, the impact of technological change, underlying exogenously set commodity prices and exchange rates. All these factors have had a significant impact on development, some with little discussion but others, such as water, have been contested and bitterly fought over. The article also examines these drivers and how they might affect future development. [ABSTRACT FROM AUTHOR]

During COP15, in Copenhagen, Denmark, in December 2009, 34 developed countries were listed in Annex 1 (United Nations, [14]), collectively agreeing that, by 2020, they will provide US$100 billion per year to non-Annex 1-developing countries so that they can play their parts in climate change mitigation. Water security and climate change are only two of the major problems humankind is facing at present, and they will continue to be so for decades to come. Climate change Climate change is already having serious economic, social and political impacts on the world. It should be noted that even though the US$100 billion climate fund has not materialized yet, and is unlikely to be available before 2024, this support to developing countries needs to be increased significantly after 2025, if the world is to make much headway in terms of mitigation and adaptation to climate change. [Extracted from the article]

Australia experiences a wide range and increasing incidence of extreme hydrological events, including step changes in stream flows, extreme drought, bushfires followed by heavy rain, and storm events, which impact water availability and water quality. This article discusses the management of these events in the provision of water services in urban Australia. These events are being actively and effectively managed by large water service providers, covering around 80% of the population. But the experience for the remaining 20% is mixed, with smaller service providers often struggling to meet community expectations. This suggests a need for further governance reforms. [ABSTRACT FROM AUTHOR]