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Turning global water security research into policy and action 将全球水安全研究转化为政策和行动
Pub Date : 2024-07-01 DOI: 10.1371/journal.pwat.0000261
Evan A. Thomas
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引用次数: 0
Neglected second and third generation challenges of urban sanitation: A review of the marginality and exclusion dimensions of safely managed sanitation 被忽视的第二代和第三代城市环境卫生挑战:审查安全管理卫生设施的边缘化和排斥问题
Pub Date : 2024-06-14 DOI: 10.1371/journal.pwat.0000252
Tanvi Bhatkal, Lyla Mehta, Roshni Sumitra
Sanitation is fundamental for health and wellbeing yet cities, especially in the global South, face challenges in providing safely managed sanitation systems. Global and national sanitation campaigns tend to focus on the visible aspects of being ‘on grid’ in terms of toilet construction and connections but rarely address the dangerous, invisible aspects of being ‘off grid’ such as poor or unsafe excreta disposal and inadequate faecal sludge management (often considered to be second or third generation sanitation challenges). These, however, tend to disproportionately affect poor and marginalised people in off-grid locations in rapidly urbanising areas. This review paper engages critically with the growing literature on the challenges of faecal sludge management and circular economy solutions. Through the lens of exclusion and marginality, we review debates regarding access to safely managed sanitation, the burden of sanitation workers and safely recovering value from shit. We argue that sanitation systems often reproduce and exacerbate existing societal hierarchies and discriminations in terms of unequal access to safely managed sanitation and the burden of maintaining sanitation infrastructures. It is thus important for future research on faecal sludge management and resource recovery from shit to focus on issues of marginality and exclusion.
环境卫生对健康和福祉至关重要,但城市,尤其是全球南部的城市,在提供安全管理的环境卫生系统方面面临挑战。全球和各国的环境卫生运动往往侧重于 "入网 "的可见方面,如厕所建设和连接,但很少涉及 "离网 "的危险、不可见方面,如排泄物处理不当或不安全、粪便污泥管理不足(通常被认为是第二代或第三代环境卫生挑战)。然而,这些问题往往会对快速城市化地区离网地区的贫困人口和边缘化人群造成严重影响。这篇综述论文以批判性的眼光审视了有关粪便污泥管理挑战和循环经济解决方案的不断增长的文献。通过排斥和边缘化的视角,我们回顾了有关获得安全管理的卫生设施、环卫工人的负担以及从粪便中安全回收价值的辩论。我们认为,在获得安全管理的卫生设施的不平等机会和维护卫生基础设施的负担方面,卫生系统经常复制和加剧现有的社会等级制度和歧视。因此,未来有关粪便污泥管理和粪便资源回收的研究必须关注边缘化和排斥问题。
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引用次数: 0
The paradox of production: Surface water supply drives agricultural productivity but not prosperity in California’s San Joaquin Valley 生产的悖论:地表水供应推动了加利福尼亚圣华金河谷的农业生产力,但并没有带来繁荣
Pub Date : 2024-06-13 DOI: 10.1371/journal.pwat.0000192
Vicky Espinoza, J. Viers
Societies globally are struggling to meet freshwater demands while agencies attempt to address water access inequities under a rapidly changing climate and growing population. An understanding of dynamic interactions between people and water, known as sociohydrology, regionally could provide approaches to addressing local water mismanagement and water access inequity. In semi-arid California, local water agencies, primarily agricultural irrigation districts, are at the intersection of rethinking approaches to balance freshwater demands. More than 150 years of complex water governance and management have defined San Joaquin Valley irrigation districts and the region’s water access inequities and sociohydrologic instability. Older irrigation districts have higher surface water allocations and less groundwater dependence. About 60% of irrigation districts with pre-1914 water rights have twice the crop water demand in surface water allocations. In contrast, 86% of irrigation districts depend on groundwater, of which 12% rely exclusively on groundwater to supply irrigation demands. This study found that disadvantaged communities within irrigation districts do not have increased water access or better environmental conditions than those outside irrigation district boundaries, which underscores the need for inclusive water management structures to address the multifaceted water and environmental inequities. Groundwater overdependence across irrigation districts shows that imbalanced surface water allocations and inflexible crops could imperil agriculture and impact agricultural disadvantaged communities, especially under California’s SGMA and prolonged drought events. It is imperative that underserved communities are prioritized communities in achieving equitable water rebalance in California in addition to developing and implementing essential infrastructure and policy changes.
在气候迅速变化和人口不断增长的情况下,全球社会都在努力满足淡水需求,而相关机构也在试图解决水资源获取不公平的问题。了解人与水之间的动态互动(即社会水文学)可以为解决当地水资源管理不善和水资源获取不公平问题提供方法。在半干旱的加利福尼亚州,地方水务机构(主要是农业灌溉区)正处于重新思考如何平衡淡水需求的十字路口。150 多年复杂的水治理和管理决定了圣华金河谷灌区以及该地区水资源获取的不公平和社会水文的不稳定性。老灌区的地表水分配较多,对地下水的依赖较少。在 1914 年以前拥有水权的灌区中,约 60%的地表水分配量是作物需水量的两倍。相比之下,86%的灌区依赖地下水,其中 12%完全依靠地下水供应灌溉需求。本研究发现,灌区内的弱势社区与灌区外的社区相比,并没有获得更多的水资源或拥有更好的环境条件,这凸显了包容性水资源管理结构的必要性,以解决多方面的水资源和环境不平等问题。各灌区对地下水的过度依赖表明,不平衡的地表水分配和缺乏灵活性的农作物可能会危及农业并影响农业弱势群体,尤其是在加利福尼亚州的 SGMA 和长期干旱情况下。在加州实现公平的水资源再平衡的过程中,除了开发和实施必要的基础设施和政策变革外,还必须优先考虑服务不足的社区。
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引用次数: 0
Addressing water, sanitation and hygiene inequalities: A review of evidence, gaps, and recommendations for disability-inclusive WASH by 2030 解决水、环境卫生和个人卫生不平等问题:到 2030 年实现兼顾残疾人的饮水、环卫和讲卫生运动的证据、差距和建议回顾
Pub Date : 2024-06-11 DOI: 10.1371/journal.pwat.0000257
Jane Wilbur, R. Dreibelbis, I. Mactaggart
One in six people worldwide experiences significant disability. Many of these people living in low-and middle-income countries (LMICs) are disproportionately affected by inadequate access to water, sanitation and hygiene (WASH) services, a fundamental necessity for health and well-being. This review aimed to examine the existing evidence on disability and WASH in LMICs, identify gaps and make recommendations to strengthen disability-inclusive WASH research, policies and practices to make significant progress by 2030. While evidence of WASH challenges faced by people with disabilities has grown in the last decade, revealing significant inequalities, there is a lack of controlled studies to assess the impact of disability-inclusive WASH interventions. This research gap makes it difficult to prioritise investments for scalable solutions. This review proposes three key recommendations: 1) Further expand research on WASH challenges faced by people with disabilities, prioritising climate risks, health impacts, and educational inequalities. 2) Design and test evidence-based disability-inclusive WASH interventions. 3) Rigorously evaluate these interventions to determine what successfully reduces WASH disparities for people with disabilities and their caregivers cost-effectively. This review is the first to synthesise available evidence across disability and WASH and offer a roadmap for future efforts to drive improvements in disability-inclusive WASH by 2030.
全世界每六人中就有一人严重残疾。这些人中有许多生活在中低收入国家(LMICs),他们因无法获得足够的水、环境卫生和个人卫生(WASH)服务而受到严重影响,而这是健康和福祉的基本必需品。本次回顾旨在研究低收入国家和地区有关残疾和讲卫生运动的现有证据,找出差距并提出建议,以加强兼顾残疾问题的讲卫生运动研究、政策和实践,从而在 2030 年之前取得重大进展。在过去十年中,有越来越多的证据表明残疾人在讲卫生运动方面面临挑战,揭示了严重的不平等现象,但缺乏对照研究来评估兼顾残疾问题的讲卫生运动干预措施的影响。这一研究空白使得我们很难为可扩展的解决方案确定投资的优先次序。本综述提出了三项主要建议1) 进一步扩大对残疾人面临的讲卫生运动挑战的研究,优先考虑气候风险、健康影响和教育不平等。2) 设计并测试基于证据的残疾人全纳讲卫生运动干预措施。3) 严格评估这些干预措施,以确定哪些措施能以具有成本效益的方式成功减少残疾人及其照顾者在讲卫生运动方面的差异。本综述首次综合了残疾与讲卫生运动方面的现有证据,并为未来推动到 2030 年改善残疾全纳讲卫生运动的工作提供了路线图。
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引用次数: 0
Climate change, seasonality and household water security in rural Gambia: A qualitative exploration of the complex relationship between weather and water 冈比亚农村地区的气候变化、季节性和家庭用水安全:对天气与水之间复杂关系的定性探索
Pub Date : 2024-06-11 DOI: 10.1371/journal.pwat.0000239
Indira Bose, R. Dreibelbis, Rosemary Green, Kris A. Murray, Omar Ceesay, Sari Kovats
Climate change could pose a threat to water security for many communities, particularly in settings where rainfall patterns are becoming more varied and there is higher frequency of extreme events, such as heavy rainfall and droughts. Understanding how rainfall affects water security—including water access, water quality and water use behaviours—can inform investment in more climate-resilient infrastructure and safeguard against future health risks. This study aims to explore how households in rural Gambia experienced water security in relation to seasonal rainfall patterns and extreme weather events. Data collection focused on two communities (Kiang West and Basse) with differing access to water infrastructure, within which some villages had greater access to groundwater sources, such as solar-powered boreholes, and others primarily used uncovered wells. 46 participants were interviewed in Spring 2022 using multiple qualitative methods, including in-depth interviews and transect walks. We found that people’s experience of water security and rainfall (including seasonal rainfall, drought and heavy rainfall) was complex and varied according to the primary household water source. Both dry and rainy season posed challenges to household water security in terms of quality and quantity. Households with access to more resilient infrastructure, such as solar-powered boreholes, discussed a shift in the relationship between weather and water security, where they were less vulnerable to water shortages during dry conditions compared to those using wells. However, these sources did not fully resolve water security issues, as they experienced water shortages during cloudy conditions. Extreme weather events, such as heavy rainfall, heightened perceived water issues, as these events sometimes damaged water infrastructure and contaminated water sources. Seasonal workloads, that were higher in the rainy season, also jeopardised water security, as this limited time for water collection. Increased investment in infrastructure, maintenance, water-treatment and behavioural change is required to mitigate the risks.
气候变化可能会对许多社区的用水安全构成威胁,尤其是在降雨模式变得更加多变、暴雨和干旱等极端事件发生频率较高的环境中。了解降雨如何影响水安全--包括水的获取、水质和用水行为--可以为投资更具气候适应性的基础设施提供依据,并防范未来的健康风险。本研究旨在探讨冈比亚农村家庭如何体验与季节性降雨模式和极端天气事件相关的水安全问题。数据收集工作主要集中在两个社区(Kiang West 和 Basse),这两个社区的供水基础设施条件各不相同,其中一些村庄更容易获得地下水源,如太阳能井眼,而另一些村庄则主要使用无盖水井。2022 年春季,我们采用多种定性方法对 46 名参与者进行了访谈,包括深度访谈和横断面步行。我们发现,人们对水安全和降雨(包括季节性降雨、干旱和暴雨)的体验非常复杂,而且因家庭主要水源的不同而各异。旱季和雨季都对家庭用水安全的质量和数量构成挑战。使用太阳能井眼等抗灾能力较强的基础设施的家庭讨论了天气与水安全之间关系的转变,与使用水井的家庭相比,他们在干旱条件下更不容易受到缺水的影响。然而,这些水源并不能完全解决水安全问题,因为他们在阴天也会遇到缺水问题。暴雨等极端天气事件加剧了人们对水问题的认识,因为这些事件有时会破坏供水基础设施并污染水源。雨季的季节性工作量较大,也会危及水安全,因为这限制了取水时间。需要增加对基础设施、维护、水处理和行为改变的投资,以降低风险。
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引用次数: 0
Household water insecurity experience in the Upper West Region of Ghana: Insights for effective water resource management 加纳上西部地区家庭用水不安全的经验:对有效水资源管理的启示
Pub Date : 2024-06-06 DOI: 10.1371/journal.pwat.0000216
Cornelius K. A. Pienaah, Sulemana Ansumah Saaka, E. Batung, Kamaldeen Mohammed, Isaac Luginaah
The global community is not on track to achieve Sustainable Development Goal 6 (SDG 6) by 2030. Many low- and middle-income countries like Ghana still struggle with water insecurity. In semi-arid regions like Ghana’s Upper West, climate change has worsened water insecurity, leading to health and livelihood consequences. In UWR, limited studies have explored water insecurity in rural areas. This study fills a knowledge gap by investigating the determinants of water insecurity in Ghana’s Upper West Region (UWR) from a political ecology of health (PEH) perspective. It comprehensively explores the interplay of social, economic, political, environmental, and health-related factors contributing to water insecurity in the UWR. The results from binary logistic regression show that households in the wealthier category (OR = 0.475, p<0.05) and those that spent less than thirty minutes on a roundtrip to fetch water (OR = 0.474, p<0.01) were less likely to experience water insecurity. On the other hand, households that did not use rainwater harvesting methods (OR = 2.117, p<0.01), had to travel over a kilometer to access water (OR = 3.249, p<0.01), had inadequate water storage systems (OR = 2.290, p<0.001), did not treat their water (OR = 2.601, p<0.001), were exposed to water-induced infections (OR = 3.473, p<0.001), did not receive any water, hygiene, and sanitation education (OR = 2.575, p<0.01), and faced water scarcity during the dry season (OR = 2.340, p<0.001) were at a higher risk of experiencing water insecurity. To mitigate the risks of water insecurity and adverse health impacts, policymakers and practitioners must work together to educate households on effective water conservation, storage, and treatment techniques. It is recommended that households harvest rainwater as a coping strategy, construct appropriate storage systems, and treat their water. Communal self-help water investments should be encouraged and supported. Given the significant aquifers and semi-arid landscape of the UWR, investing in groundwater development should be a top priority.
全球社会尚未走上到 2030 年实现可持续发展目标 6(SDG 6)的正轨。许多像加纳这样的中低收入国家仍在与水资源不安全作斗争。在加纳上西部等半干旱地区,气候变化加剧了水资源不安全状况,导致健康和生计受到影响。在加纳上西部,对农村地区水资源不安全问题的研究十分有限。本研究从健康政治生态学(PEH)的角度调查了加纳上西部地区(UWR)水资源不安全的决定因素,填补了这一知识空白。该研究全面探讨了导致加纳上西区水资源不安全的社会、经济、政治、环境和健康相关因素之间的相互作用。二元逻辑回归的结果显示,较富裕家庭(OR = 0.475,P<0.05)和往返取水时间少于 30 分钟的家庭(OR = 0.474,P<0.01)经历用水不安全的可能性较小。另一方面,不使用雨水收集方法(OR = 2.117,p<0.01)、取水路程超过一公里(OR = 3.249,p<0.01)、储水系统不足(OR = 2.290,p<0.001)、不对水进行处理(OR = 2.601,p<0.001)、受到水引起的感染(OR = 3.473,p<0.001)、没有接受过任何水、个人卫生和环境卫生教育(OR = 2.575,p<0.01)以及在旱季面临缺水(OR = 2.340,p<0.001)的人遭遇水不安全的风险更高。为了降低用水不安全的风险和对健康的不利影响,政策制定者和从业人员必须共同努力,教育家庭掌握有效的节水、储水和水处理技术。建议家庭将收集雨水作为一种应对策略,建造适当的储水系统,并对水进行处理。应鼓励和支持社区自助供水投资。鉴于西印度洋河谷地区拥有大量含水层和半干旱地貌,投资开发地下水应成为重中之重。
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引用次数: 0
Public health policy impact evaluation: A potential use case for longitudinal monitoring of viruses in wastewater at small geographic scales 公共卫生政策影响评估:小地理范围内废水中病毒纵向监测的潜在应用案例
Pub Date : 2024-06-03 DOI: 10.1371/journal.pwat.0000242
Elana M. G. Chan, A. Bidwell, Zongxi Li, S. Tilmans, A. Boehm
Public health policy impact evaluation is challenging to study because randomized controlled experiments are infeasible to conduct, and policy changes often coincide with non-policy events. Quasi-experiments do not use randomization and can provide useful knowledge for causal inference. Here we demonstrate how longitudinal wastewater monitoring of viruses at a small geographic scale may be used in a quasi-experimental design to evaluate the impact of COVID-19 public health policies on the spread of COVID-19 among a university population. We first evaluated the correlation between incident, reported COVID-19 cases and wastewater SARS-CoV-2 RNA concentrations and observed changes to the correlation over time, likely due to changes in testing requirements and testing options. Using a difference-in-differences approach, we then evaluated the association between university COVID-19 public health policy changes and levels of SARS-CoV-2 RNA concentrations in wastewater. We did not observe changes in SARS-CoV-2 RNA concentrations associated with most policy changes. Policy changes associated with a significant change in campus wastewater SARS-CoV-2 RNA concentrations included changes to face covering recommendations, indoor gathering bans, and routine surveillance testing requirements and availability.
公共卫生政策影响评估研究具有挑战性,因为进行随机对照实验是不可行的,而且政策变化往往与非政策事件同时发生。准实验不使用随机化,可以为因果推断提供有用的知识。在此,我们展示了如何在准实验设计中使用小地理范围内的纵向病毒废水监测来评估 COVID-19 公共卫生政策对 COVID-19 在大学人群中传播的影响。我们首先评估了事件、报告的 COVID-19 病例与废水中 SARS-CoV-2 RNA 浓度之间的相关性,并观察到相关性随着时间的推移而变化,这可能是由于检测要求和检测方案的变化所致。然后,我们采用差分法评估了大学 COVID-19 公共卫生政策变化与废水中 SARS-CoV-2 RNA 浓度水平之间的关联。我们没有观察到与大多数政策变化相关的 SARS-CoV-2 RNA 浓度变化。与校园废水中 SARS-CoV-2 RNA 浓度的重大变化相关的政策变化包括遮盖面部建议、室内集会禁令以及常规监测检测要求和可用性的变化。
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引用次数: 0
The case for shared sanitation access in informal settlements: A dialogue on science, policy, and practice integration 非正规住区共享卫生设施的理由:关于科学、政策和实践一体化的对话
Pub Date : 2024-05-10 DOI: 10.1371/journal.pwat.0000243
Sarah Lebu, L. Sprouse, J. Akudago, Felix R. B. Twinomucunguzi, Ruthie Rosenberg, Yvonne Sanyu Lugali, B. Aine, Jackqueline Tu-uyen Nguyen, Chimdi C. Muoghalu, Swaib Semiyaga, Barbara Evans, M. Manga
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引用次数: 0
Longitudinal changes in hand hygiene adherence among healthcare workers during the COVID-19 pandemic, Dominican Republic 多米尼加共和国 COVID-19 大流行期间医护人员手部卫生坚持率的纵向变化
Pub Date : 2024-05-10 DOI: 10.1371/journal.pwat.0000231
C. D. Schnorr, Kathryn W. Roberts, E.C. Payano, Paloma Martínez Guzmán, M. De St. Aubin, Matthew Lozier, Salomé Garnier, D. Dumas, Kelsey McDavid, C. T. Then Paulino, R. Skewes-Ramm, C. Craig, E. Zielinski Gutiérrez, William Duke, E. Nilles
Hand hygiene (HH) can reduce transmission of healthcare-associated infections (HAIs) in healthcare facilities and is especially important in low- and middle-income countries where HH infrastructure may be insufficient and the burden of HAIs is highest. At baseline, we assessed HH infrastructure and practices among healthcare workers (HCWs) at two large hospitals in the Dominican Republic during the COVID-19 pandemic. HCWs were observed for HH adherence (HHA) (defined as the use of alcohol-based hand rub (ABHR) or handwashing with soap and water) before and after patient contact and donning new gloves before patient contact. The baseline assessment was repeated following implementation of local production and distribution of ABHR and a HH promotion campaign. Descriptive analyses and regression models evaluated predictors of HHA and glove use. Cumulative HHA was 18.9%. While patient-care areas with a functional HH resource increased from 47% at baseline to 92% after the intervention, HHA declined from 23.0% to 16.7%. HHA was higher after patient contact (aOR = 5.88; 95% CI = 4.17–8.33), during a period of increased COVID-19 risk (aOR = 1.69; 95% CI = 1.05–2.77), during invasive patient contacts (aOR = 1.64; 95% CI = 1.23–2.17) and when gloves were not used (aOR = 1.25; 95% CI = 1.01–1.56). The negative association between glove use and HHA diminished when access to HH resources increased. New gloves were donned before 39.6% of patient contacts. Glove use was higher among nurses (aOR = 7.12; 95% CI = 3.02–16.79) and during invasive contacts (aOR = 4.76; 95% CI = 2.27–10.0). While access to HH resources increased after the interventions, HHA did not increase. HHA was lower when COVID-19 risk was lower. Findings from this study may guide future efforts to increase HHA among HCWs.
手部卫生 (HH) 可以减少医疗机构中的医源性感染 (HAI) 传播,这一点在中低收入国家尤为重要,因为这些国家的手部卫生基础设施可能不足,医源性感染的负担最重。在 COVID-19 大流行期间,我们对多米尼加共和国两家大型医院的卫生保健基础设施和医护人员(HCWs)的卫生保健实践进行了基线评估。我们观察了医护人员在接触患者前后是否遵守卫生设施(HHA)(定义为使用酒精擦手液(ABHR)或用肥皂和水洗手),以及在接触患者前是否佩戴新手套。在当地生产和分发 ABHR 并开展 HH 宣传活动后,再次进行基线评估。描述性分析和回归模型评估了 HHA 和手套使用的预测因素。累计 HHA 为 18.9%。在干预措施实施后,拥有功能性 HH 资源的病人护理区从基线时的 47% 增加到 92%,而 HHA 则从 23.0% 下降到 16.7%。患者接触后(aOR = 5.88;95% CI = 4.17-8.33)、COVID-19 风险增加期间(aOR = 1.69;95% CI = 1.05-2.77)、侵入性患者接触期间(aOR = 1.64;95% CI = 1.23-2.17)以及未使用手套时(aOR = 1.25;95% CI = 1.01-1.56),HHA 较高。当获得 HH 资源的机会增加时,手套使用与 HHA 之间的负相关关系就会减弱。39.6%的患者在接触前会戴上新手套。护士(aOR = 7.12; 95% CI = 3.02-16.79)和侵入性接触期间(aOR = 4.76; 95% CI = 2.27-10.0)的手套使用率更高。干预后,虽然获得 HH 资源的机会增加了,但 HHA 却没有增加。当 COVID-19 风险较低时,HHA 也较低。本研究的结果可为今后提高医护人员HHA的工作提供指导。
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引用次数: 0
Climate resilience of small-town water utilities in Eastern Ethiopia 埃塞俄比亚东部小城镇供水设施的气候适应能力
Pub Date : 2024-05-06 DOI: 10.1371/journal.pwat.0000158
Abraham Geremew, A. Nijhawan, B. Mengistie, Dinku Mekbib, Adrian Flint, Guy Howard
Climate change threatens the safety of water supplies globally, but small water supplies in rapidly growing and urbanizing towns in low- and middle-income countries are especially at risk. Despite the efforts of the Government of Ethiopia, research shows that that small-town water utilities in Ethiopia are poorly equipped to prioritize developing and maintaining climate-resilient water services. We applied the How tough is WASH framework for climate resilient water supplies to ten town water utilities in Eastern Ethiopia to identify their strengths and weaknesses in preparing for climate change. We found reports of weak institutional support from service authorities and exclusion of climate risk management from trainings, which cascades down to service providers in the form of lack of emergency response, inadequate staffing and financial mismanagement. This is consistent with previous studies on sustainability of town water utilities, and highlights the applicability of this tool into existing monitoring frameworks that have been proposed for town water utilities in Ethiopia. We also modified the How tough is WASH framework to capture these findings and better reflect the complexity of a utility-managed piped water supply.
气候变化威胁着全球的供水安全,但中低收入国家快速发展和城市化城镇中的小型供水设施尤其面临风险。尽管埃塞俄比亚政府做出了努力,但研究表明,埃塞俄比亚的小城镇供水公司在优先发展和维护适应气候的供水服务方面能力不足。我们将 "讲卫生运动有多艰难"(How tough is WASH)框架应用于埃塞俄比亚东部的十个城镇供水公司,以确定它们在应对气候变化方面的优势和劣势。我们发现有报告称,服务部门的机构支持薄弱,培训中也未提及气候风险管理,这就导致服务提供商缺乏应急响应、人员配备不足和财务管理不善。这与之前关于城镇供水设施可持续性的研究相一致,并突出了该工具在现有监测框架中的适用性,这些框架已被提议用于埃塞俄比亚的城镇供水设施。我们还修改了 "讲卫生运动有多艰难 "框架,以捕捉这些发现并更好地反映公用事业管理的自来水供应的复杂性。
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引用次数: 0
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