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Measurement and governance must advance together Achieving universal, safely managed water and sanitation services by 2030, as envisioned by the United Nations (UN) Sustainable Development Goal (SDG) 6, is projected to require capital expenditures of USD 114 billion per year ( 1 ). Investment on that scale, along with accompanying policy reforms, can be motivated by a growing appreciation of the value of water. Yet our ability to value water, and incorporate these values into water governance, is inadequate. Newly recognized cascading negative impacts of water scarcity, pollution, and flooding underscore the need to change the way we value water ( 2 ). With the UN/World Bank High Level Panel on Water having launched the Valuing Water Initiative in 2017 to chart principles and pathways for valuing water, we see a global opportunity to rethink the value of water. We outline four steps toward better valuation and management (see the box), examine recent advances in each of these areas, and argue that these four steps must be integrated to overcome the barriers that have stymied past efforts.

The increasing probability of loss and damage to floods is a global concern. Countries are united by an urgent need to reduce flood risk to households, businesses, agricultural land, and infrastructure. As natural and engineered protection erodes with climate change and development pressures, new approaches to flood risk management delivered at the catchment scale that work with nature hold promise. One nature-based solution that aligns with this Special Issue on river flooding is the temporary storage of floodwaters on the floodplain. In many countries, this would involve controlled flooding inland low-lying agricultural land. Designing schemes that farmers and irrigation districts will adopt is essential. To inform future floodplain storage options, we review farm-centred drought management, specifically, agreements that transfer agricultural water to municipalities through fallowing in California, USA and an Australian farm exit scheme. These initiatives reveal underpinning principles around the need to: balance the multiple objectives of the parties, share the benefits and responsibilities, address local impacts and practical guidance on incentive design including the consideration of conditional participation requirements and responding to farmer and public preferences. In terms of funding there is opportunity for blended financing with flood-prone communities, insurers, and conservation charities.

ABSTRACT Natural flood management (NFM) is a nature-based solution (NbS) widely recognised as an option to regulate flooding whilst providing multiple ecosystem services (ES) for society and the environment. To address climate change-enhanced flood risk, localised-NFM could be scaled out (expanded geographically to the catchment level). Implementing catchment-scale NFM will not only change landscape appearance but also give rise to potential ES trade-offs between the ‘providers’ of upstream land for flood regulation and the ‘beneficiaries’ of reduced flooding downstream. This paper presents a live case study of four river catchments in the UK, where a multi-agency-funded collaborative project is implementing integrated, catchment-scale NFM to work with downstream urban flood defences. Assessment of the views of upstream-downstream catchment communities is limited. Utilising five focus groups (n = 17 participants) we investigate the potential misalignments or synergies between catchment communities that will provision or benefit from NFM that could either derail or support scaling out initiatives. Results reveal that upstream and downstream participants hold strong affinities to contemporary rural landscape aesthetics, expressing sympathies with tasking farmers with delivering flood regulation ES when their traditional vocation is to deliver provisioning ES. Participants also exhibited resistance to landscape change caused by NFM. Nevertheless, acceptability of scaling out NFM increased when aesthetic preferences were considered, especially in provider regions, while beneficiaries prioritised more effective NFM measures over appearance. Inclusive discussion and knowledge exchange (e.g. personal stories, catchment visualisations) in the focus groups facilitated greater appreciation of whole catchment community values and understanding for scaling out NFM.

Increasing pressure on shared water resources has often been a driver for the development and utilisation of water resource models (WRMs) to inform planning and management decisions. With an increasing emphasis on regional decision-making among competing actors as opposed to top-down and authoritative directives, the need for integrated knowledge and water diplomacy efforts across federal and international rivers provides a test bed for the ability of WRMs to operate within complex historical, social, environmental, institutional and political contexts. This paper draws on theories of sustainability science to examine the role of WRMs to inform transboundary water resource governance in large river basins. We survey designers and users of WRMs in the Colorado River Basin in North America and the Murray-Darling Basin in southeastern Australia. Water governance in such federal rivers challenges inter-governmental and multi-level coordination and we explore these dynamics through the application of WRMs. The development pathways of WRMs are found to influence their uptake and acceptance as decision support tools. Furthermore, we find evidence that WRMs are used as boundary objects and perform the functions of ‘boundary work’ between scientists, decision-makers and stakeholders in the midst of regional environmental changes.

Many coastal places around the UK face change, with impacts on communities, livelihoods, and landscapes. A tidal surge in 2013 caused significant erosion and flooding on the east coast of England (UK). This was the catalyst for the innovative Bacton to Walcott Coastal Management Scheme, also known as the Sandscaping Scheme, implemented in summer 2019. It is a one-off, large-scale beach nourishment scheme with a design prediction of 15–20 years functional life, the first of its kind in the UK and worldwide outside of the Netherlands. Through stakeholder interviews and a household questionnaire survey, this paper examines the institutional and political challenges, expectations, and hopes associated with this Scheme just before its implementation. The findings indicate that a combination of factors enabled technical and institutional experimentation and innovation at this location: critical erosion risk at a site of strategic infrastructure adjacent to two highly vulnerable villages, extensive stakeholder collaboration across scales, resolute leadership, and recognition of co-benefits. Although most interviewees and local residents foresaw significant benefit from the Scheme—not least respite from the deep anxiety caused by the threat of flooding and erosion risk—tensions were expressed around uncertainty beyond the Scheme’s lifetime and the need to start effective conversations about future adaptation options for the area. This study provides reflections for similar nature-based coastal management schemes elsewhere. It highlights the fundamental challenges facing the governance of natural and social coastal systems for adapting to current and future coastal change and the importance of articulating local and sometimes intangible understandings and expectations of adaptive coastal management interventions.

Urban river catchments face multiple water quality challenges that threaten the biodiversity of riverine habitats and the flow of ecosystem services. We examined two water quality challenges, runoff from increasingly impervious land covers and effluent from combined sewer overflows within a temperate zone river catchment in Greater Manchester, North-West UK. Sub-catchment areas of the River Medlock were delineated from digital elevation models using a Geographical Information System. By combining flow accumulation and high-resolution land cover data within each sub-catchment and water quality measurements at five sampling points along the river, we identified which land cover(s) are key drivers of water quality. Impervious land covers increased downstream and were associated with higher runoff and poorer water quality. Of the impervious covers, transportation networks have the highest runoff ratios and therefore the greatest potential to convey contaminants to the river. We suggest more integrated management of imperviousness to address water quality, flood risk and, urban wellbeing could be achieved with greater catchment partnership working.

This paper investigates the accessibility and usefulness of the Ecosystem Services (ES) framework to policy analysts. Using a mixed methods approach of document analysis and semi-structured interviews we examine how an ES assessment of the benefits of restoring water to the Murray-Darling Basin (MDB) in Australia has been used by government agencies in policy and planning. The ES assessment links changes in water management under the Basin Plan with modelled changes in water quality, river flows and inundation patterns and in turn to modelled freshwater and estuarine ecosystem response. These ecological responses were expressed in terms of incremental ES benefits which were valued monetarily using a variety of valuation techniques. To investigate how these pieces of information were used in the policy debate around the re-allocation of water in the MDB, semi-structured interviews were conducted with 20 Australian, State, and local government officials as well as academics and consultants. The interviews were designed to uncover the complex information dissemination process through networks within and among agencies. The results are mixed as to whether the assessment served to influence public policy. The report has been utilized and cited by Australian federal agencies, the downstream State of South Australia and conservation-based NGOs in their position statements and as such has been used as evidence in support of re-allocation of water in the MDB. A number of interview participants commented that the ES assessment raised awareness and this may lead to broader usage of the information and framework in the implementation phase of MDB water reform.

The demand for catchment‐based flood management to adapt to climate change is growing, with natural flood management (NFM) receiving increasing attention. NFM has implications for the ‘providers’ of land for measures upstream (the farmers) and the ‘beneficiaries’ of flood reduction downstream (the public). The misalignment of interests from these stakeholder groups may pose a challenge for flood risk managers during the delivery of NFM at the catchment scale. Considering this, a rapid evidence assessment (REA) of 60 peer‐reviewed articles was undertaken. This REA provides an overview of catchment perspectives, compares farmer and public preferences for NFM design, and explores key determinants of scheme acceptance. The public expressed positive perceptions and willingness to pay for NFM, with preferences for measures with large water storage capacity that deliver co‐benefits alongside flood management objectives. For farmers, NFM schemes that contributed to on‐farm conditions, for example, soil stability, were seen as positive, but overall, their willingness to adopt measures was limited. Nevertheless, knowledge of NFM among both groups strongly determined its acceptance. This suggests that resolving misaligned values will require policymakers and practitioners to work with these stakeholders on NFM design and farmer incentives to secure the delivery of future schemes.

Inter-annual snow reliability is a key short-term concern for Arizona's high elevation, low latitude ski resorts. Variability is linked to the El Niño Southern Oscillation (ENSO)-warm phase conditions typically portend a good ski season and vice versa. To operate more consistently in the medium-term Arizona's two largest ski resorts plan to expand snowmaking. Snowmaking is a water and temperature constrained adaptation. One of the two resorts has overcome its water constraint by contracting with a municipality for treated wastewater. To assess the temperature constraint downscaled global coupled climate model temperature projections were compared to technical thresholds for the manufacture of snow at three time steps. In 2030, a period coincident with the lifetime of the investments, snowmaking will likely remain feasible. However, by 2050, temperatures will likely exceed technical thresholds in the shoulder seasons meaning that in years when natural snowfalls are poor the ski season may be curtailed. By 2080, without snowmaking efficiency improvements, warmer temperatures will make snowmaking increasingly more expensive and resort managers may need to plan for a future where operations and snowmaking are shifted to higher elevation, shaded, more snow reliable runs.

We report on a grounded theory research methodology to elicit the values that underpin community leaders’ advice on regional natural resource management. In-depth, semi-structured in-person interviews of 56 community leaders permitted respondents to explore their values and to elucidate some trade-offs. Furthermore, analysis of the coded transcripts provides evidence of the anthropocentric nature of values, and the importance of people, communities, and physical infrastructure. As well, the relative silence by community NRM leaders on supporting and regulating ecosystem services may reveal a lack of understanding of these functions rather than a discord in values. The tested methodology provides one approach to understanding the values of important advisory groups that are increasingly being required to guide regional agencies that implement natural resource management policy. Results indicate that, in practice, the values expressed may at times be confrontingly anthropocentric, although those interviewed also expressed existence values. Greater understanding of values is a prerequisite to the design of improved natural resource management.