Pub Date : 2023-12-29DOI: 10.1371/journal.pwat.0000170
S. Awatere, Garth Harmsworth, Nikki Harcourt, Y. Taura, Lara Taylor, Mahuru Wilcox, J. Hyslop
Large-scale transformation and modification of landscapes have occurred across most catchments in Aotearoa-New Zealand (A-NZ) in the past 200-years (mainly mid-1800s to mid- 1900s). This has been mainly through large-scale removal of indigenous forest and draining of wetlands to a landscape dominated by urban settlement and highly modified landscapes. The expansive shift to pastoral farming and urban settlement, under a colonial settlement vision has increasingly led to detrimental cumulative impacts on ecological health. Environmental decline has been tightly linked to significant adverse impacts on Māori (the Indigenous people of A-NZ) wellbeing. For Māori, this has been out of balance and step with an indigenous-based vision of A-NZ. To understand how a Māori worldview can help drive transformation in the health of our catchments and their communities, we argue that an Ao Māori (Māori worldview) framing for catchment management is necessary with reference to three catchment case studies (Kaipara, Waikato, and Waiapu). These case studies were chosen because they provide tangible examples of resurgence in the use and understanding of mātauranga Māori (Māori knowledge) next to co-governance, co-management, and decision-making. In the Kaipara, the collaborative governance model ensured that all parties’ views were understood and factored into decision making and this has led to growing social equity and more sustainable relationships with the whenua. Similarly, in the Waikato, co-governance of the waterways has increased the efficiency and effectiveness of the process. Knowledge sharing and engagement has directly driven positive environmental outcomes. So too for the Waiapu, where increased hapū/iwi capability and capacity has increased social cohesion and implementation of targeted actions to mitigate climate change impacts. We explore how by adopting a holistic approach to environmental stewardship, and having intimate knowledge at place, Māori thinking has the potential to rejuvenate environmental management, emphasising the necessity of partnership-based approaches.
{"title":"Whakamana te tangata – ka whai oranga te taiao: Indigenous led approaches for catchment health in Aotearoa-New Zealand","authors":"S. Awatere, Garth Harmsworth, Nikki Harcourt, Y. Taura, Lara Taylor, Mahuru Wilcox, J. Hyslop","doi":"10.1371/journal.pwat.0000170","DOIUrl":"https://doi.org/10.1371/journal.pwat.0000170","url":null,"abstract":"Large-scale transformation and modification of landscapes have occurred across most catchments in Aotearoa-New Zealand (A-NZ) in the past 200-years (mainly mid-1800s to mid- 1900s). This has been mainly through large-scale removal of indigenous forest and draining of wetlands to a landscape dominated by urban settlement and highly modified landscapes. The expansive shift to pastoral farming and urban settlement, under a colonial settlement vision has increasingly led to detrimental cumulative impacts on ecological health. Environmental decline has been tightly linked to significant adverse impacts on Māori (the Indigenous people of A-NZ) wellbeing. For Māori, this has been out of balance and step with an indigenous-based vision of A-NZ. To understand how a Māori worldview can help drive transformation in the health of our catchments and their communities, we argue that an Ao Māori (Māori worldview) framing for catchment management is necessary with reference to three catchment case studies (Kaipara, Waikato, and Waiapu). These case studies were chosen because they provide tangible examples of resurgence in the use and understanding of mātauranga Māori (Māori knowledge) next to co-governance, co-management, and decision-making. In the Kaipara, the collaborative governance model ensured that all parties’ views were understood and factored into decision making and this has led to growing social equity and more sustainable relationships with the whenua. Similarly, in the Waikato, co-governance of the waterways has increased the efficiency and effectiveness of the process. Knowledge sharing and engagement has directly driven positive environmental outcomes. So too for the Waiapu, where increased hapū/iwi capability and capacity has increased social cohesion and implementation of targeted actions to mitigate climate change impacts. We explore how by adopting a holistic approach to environmental stewardship, and having intimate knowledge at place, Māori thinking has the potential to rejuvenate environmental management, emphasising the necessity of partnership-based approaches.","PeriodicalId":93672,"journal":{"name":"PLOS water","volume":"21 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139145946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-21DOI: 10.1371/journal.pwat.0000190
A. R. El-Khattabi, Kyra Gmoser‐Daskalakis, Gregory Pierce
Rising water bills across the U.S. underscore the need to understand the factors that contribute to disparities in local system bills. In this paper, we examine residential water bill amounts from 1,720 systems in four states in different regions of the U.S. (Arizona, Georgia, New Hampshire and Wisconsin) to (1) examine how local system bills at a constant consumption level (4,000 gallons per month or 15.14m3) for drinking water vary within and across states, as well as within combined metropolitan statistical areas (MSAs), and (2) study the relationship between local system bills and system-level characteristics. We find a high degree of similarity in median bill amounts between states but substantial variation within them at the MSA and local system scale. Our multivariate analysis suggests that municipally-owned systems are more likely to have lower water bills relative to for-profit systems, while factors such as purchasing water and having neighboring systems with high bills significantly correlate with higher water bills. Though we find that water systems with high levels of poverty tend to have higher water bills, our results also suggest that local systems that serve populations with higher levels of income inequality and higher proportions of non-White population tend to have lower water bills. These findings point to future research and data needs to better inform federal, state and local water affordability policy and underline the importance of examining and addressing water affordability at local scales.
{"title":"Keep your head above water: Explaining disparities in local drinking water bills","authors":"A. R. El-Khattabi, Kyra Gmoser‐Daskalakis, Gregory Pierce","doi":"10.1371/journal.pwat.0000190","DOIUrl":"https://doi.org/10.1371/journal.pwat.0000190","url":null,"abstract":"Rising water bills across the U.S. underscore the need to understand the factors that contribute to disparities in local system bills. In this paper, we examine residential water bill amounts from 1,720 systems in four states in different regions of the U.S. (Arizona, Georgia, New Hampshire and Wisconsin) to (1) examine how local system bills at a constant consumption level (4,000 gallons per month or 15.14m3) for drinking water vary within and across states, as well as within combined metropolitan statistical areas (MSAs), and (2) study the relationship between local system bills and system-level characteristics. We find a high degree of similarity in median bill amounts between states but substantial variation within them at the MSA and local system scale. Our multivariate analysis suggests that municipally-owned systems are more likely to have lower water bills relative to for-profit systems, while factors such as purchasing water and having neighboring systems with high bills significantly correlate with higher water bills. Though we find that water systems with high levels of poverty tend to have higher water bills, our results also suggest that local systems that serve populations with higher levels of income inequality and higher proportions of non-White population tend to have lower water bills. These findings point to future research and data needs to better inform federal, state and local water affordability policy and underline the importance of examining and addressing water affordability at local scales.","PeriodicalId":93672,"journal":{"name":"PLOS water","volume":"32 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138949030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-20DOI: 10.1371/journal.pwat.0000086
Ivy Chumo, B. Mberu, Cynthia Wainaina, Wanjiru Murigi, Leunita A. Sumba, Caroline W. Kabaria
Poorly managed sanitation is degrading, unhealthy and far too dominant among the urban poor. The conventional solution to poorly managed onsite sanitation and/or open defecation is for governments to provide adequate sanitation at subsidized prices. Few governments in low and middle income countries can subsidize access to sanitation facilities for people living and working in informal settlements. This leaves the urban poor in informal settlements to face challenges in accessing safely managed sanitation, with some residents and manual pit emptiers adopting social capital approaches. We sought to identify sanitation challenges along the value chain and social capital approaches to addressing the challenges. We used qualitative approaches. Our target population were manual pit emptiers and community members. We analysed data using conventional content analysis methodology. We grouped sanitation challenges into those that are outside individual households and those that are at the individual household. Challenges outside the household could not be controlled at the individual level, and included legislative, physical, and social challenges, while challenges at the individual household could be controlled at individual level, and included health, financial and technical challenges. As a result of these challenges, both the manual emptiers and community members adopted social capital approaches, which included the use of reciprocity and trust, networks and information channels and norms to counter the challenges. Sanitation challenges along the sanitation value chain should persuade policymakers and practitioners that sanitation extends beyond the four walls of a sanitation containment facility, to include emptying, transportation, treatment and disposal. Many of the challenges could be attributed to governance outside the sanitation sector. Hence long-term improvement of sanitation conditions in informal settlements ought to be supported by broader policies and strategies like social capital that begins by thinking outside “the sanitation box”.
{"title":"Sanitation services for the urban poor: A social capital approach to sanitation challenges in informal settlements","authors":"Ivy Chumo, B. Mberu, Cynthia Wainaina, Wanjiru Murigi, Leunita A. Sumba, Caroline W. Kabaria","doi":"10.1371/journal.pwat.0000086","DOIUrl":"https://doi.org/10.1371/journal.pwat.0000086","url":null,"abstract":"Poorly managed sanitation is degrading, unhealthy and far too dominant among the urban poor. The conventional solution to poorly managed onsite sanitation and/or open defecation is for governments to provide adequate sanitation at subsidized prices. Few governments in low and middle income countries can subsidize access to sanitation facilities for people living and working in informal settlements. This leaves the urban poor in informal settlements to face challenges in accessing safely managed sanitation, with some residents and manual pit emptiers adopting social capital approaches. We sought to identify sanitation challenges along the value chain and social capital approaches to addressing the challenges. We used qualitative approaches. Our target population were manual pit emptiers and community members. We analysed data using conventional content analysis methodology. We grouped sanitation challenges into those that are outside individual households and those that are at the individual household. Challenges outside the household could not be controlled at the individual level, and included legislative, physical, and social challenges, while challenges at the individual household could be controlled at individual level, and included health, financial and technical challenges. As a result of these challenges, both the manual emptiers and community members adopted social capital approaches, which included the use of reciprocity and trust, networks and information channels and norms to counter the challenges. Sanitation challenges along the sanitation value chain should persuade policymakers and practitioners that sanitation extends beyond the four walls of a sanitation containment facility, to include emptying, transportation, treatment and disposal. Many of the challenges could be attributed to governance outside the sanitation sector. Hence long-term improvement of sanitation conditions in informal settlements ought to be supported by broader policies and strategies like social capital that begins by thinking outside “the sanitation box”.","PeriodicalId":93672,"journal":{"name":"PLOS water","volume":"7 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139169643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-19DOI: 10.1371/journal.pwat.0000212
{"title":"Correction: Convergence of mechanistic modeling and artificial intelligence in hydrologic science and engineering","authors":"","doi":"10.1371/journal.pwat.0000212","DOIUrl":"https://doi.org/10.1371/journal.pwat.0000212","url":null,"abstract":"","PeriodicalId":93672,"journal":{"name":"PLOS water","volume":" 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138961749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-08DOI: 10.1371/journal.pwat.0000160
Elena Gordillo Fuertes
Water security is one of the biggest challenges of the 21st century. Understanding context-specific challenges and opportunities around this issue is key to improving water systems globally. This paper explores the current state of urban water security in Ulaanbaatar, Mongolia’s capital city. Ulaanbaatar is home to more than 40% of the country’s population and 60% of its national GDP. The city is located in the Tuul River basin and relies almost entirely on groundwater aquifers of the Tuul River for its supply of clean drinking water. In recent years, socio-economic stressors resulting from rapid urbanisation and environmental pressures have intensified the levels of degradation of the Tuul River and intensified the risks of water insecurity for the population of Ulaanbaatar. First, this paper draws from an extensive literature review and document analysis to provide an overview of the current state of urban water security in Ulaanbaatar. Secondly, the discussion is substantiated with information from key informant interviews which aim to explain the ongoing challenges for water security in Ulaanbaatar and suggest paths for improvement. This study finds that the main challenges for water security in Ulaanbaatar are data unavailability, limited human and financial resources across public water sector agencies, exacerbating flood risk and ongoing water quality disparities between the central city area and peri-urban ger districts.
{"title":"Understanding contemporary challenges for water security in Ulaanbaatar, a semi-arid region in Mongolia","authors":"Elena Gordillo Fuertes","doi":"10.1371/journal.pwat.0000160","DOIUrl":"https://doi.org/10.1371/journal.pwat.0000160","url":null,"abstract":"Water security is one of the biggest challenges of the 21st century. Understanding context-specific challenges and opportunities around this issue is key to improving water systems globally. This paper explores the current state of urban water security in Ulaanbaatar, Mongolia’s capital city. Ulaanbaatar is home to more than 40% of the country’s population and 60% of its national GDP. The city is located in the Tuul River basin and relies almost entirely on groundwater aquifers of the Tuul River for its supply of clean drinking water. In recent years, socio-economic stressors resulting from rapid urbanisation and environmental pressures have intensified the levels of degradation of the Tuul River and intensified the risks of water insecurity for the population of Ulaanbaatar. First, this paper draws from an extensive literature review and document analysis to provide an overview of the current state of urban water security in Ulaanbaatar. Secondly, the discussion is substantiated with information from key informant interviews which aim to explain the ongoing challenges for water security in Ulaanbaatar and suggest paths for improvement. This study finds that the main challenges for water security in Ulaanbaatar are data unavailability, limited human and financial resources across public water sector agencies, exacerbating flood risk and ongoing water quality disparities between the central city area and peri-urban ger districts.","PeriodicalId":93672,"journal":{"name":"PLOS water","volume":"45 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138588587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-21DOI: 10.1371/journal.pwat.0000144
Erin O’Donnell
In settler colonial states, the doctrine of discovery that dispossessed Indigenous Peoples of their lands also took their waters. The original water theft of colonization was underpinned by the erroneous assumption of ‘aqua nullius’ and remains almost entirely unacknowledged and largely unaddressed. Scholarly literature has focused on the injustice of this water theft and the human rights of Indigenous Peoples (under UNDRIP as well as their human right to water). This review shows that aqua nullius also renders settler state water law not fit for purpose in two important ways. Firstly, the legitimacy of settler state water laws is contested, presenting a foundational challenge to water governance, and failing to acknowledge the plurality of water laws in settler colonial states. Secondly, settler water law is experiencing a more widespread failure to deliver ecologically sustainable water management. In responding to the injustice of aqua nullius, foundational reform of settler state water laws can enable the settler state to learn from Indigenous laws that have supported thriving communities and genuinely sustainable water management for millennia. Drawing on examples from Aotearoa New Zealand, the USA, Canada, and Australia, this review shows how acknowledging, and challenging, the false assumption of aqua nullius creates novel pathways for reform, enabling pluralist water laws and water governance models that improve both legitimacy and sustainability of settler state water governance.
{"title":"Water sovereignty for Indigenous Peoples: Pathways to pluralist, legitimate and sustainable water laws in settler colonial states","authors":"Erin O’Donnell","doi":"10.1371/journal.pwat.0000144","DOIUrl":"https://doi.org/10.1371/journal.pwat.0000144","url":null,"abstract":"In settler colonial states, the doctrine of discovery that dispossessed Indigenous Peoples of their lands also took their waters. The original water theft of colonization was underpinned by the erroneous assumption of ‘aqua nullius’ and remains almost entirely unacknowledged and largely unaddressed. Scholarly literature has focused on the injustice of this water theft and the human rights of Indigenous Peoples (under UNDRIP as well as their human right to water). This review shows that aqua nullius also renders settler state water law not fit for purpose in two important ways. Firstly, the legitimacy of settler state water laws is contested, presenting a foundational challenge to water governance, and failing to acknowledge the plurality of water laws in settler colonial states. Secondly, settler water law is experiencing a more widespread failure to deliver ecologically sustainable water management. In responding to the injustice of aqua nullius, foundational reform of settler state water laws can enable the settler state to learn from Indigenous laws that have supported thriving communities and genuinely sustainable water management for millennia. Drawing on examples from Aotearoa New Zealand, the USA, Canada, and Australia, this review shows how acknowledging, and challenging, the false assumption of aqua nullius creates novel pathways for reform, enabling pluralist water laws and water governance models that improve both legitimacy and sustainability of settler state water governance.","PeriodicalId":93672,"journal":{"name":"PLOS water","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139251512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-20DOI: 10.1371/journal.pwat.0000155
Jonathan J. Halama, R. McKane, Bradley Barnhart, Paul P. Pettus, Allen Brookes, K. Djang, Vivian Phan, Sonali Chokshi, James Graham
Modeling large-scale hydrological impacts brought about by site-level green and gray stormwater remediation actions is difficult because urbanized areas are extremely complex dynamic landscapes that include engineered features that, by design, expedite urban runoff to streams, creeks, and other water bodies to reduce urban flooding during storm events. Many urban communities use heavily engineered gray infrastructure to achieve that goal, along with more recent additions of green infrastructure such as rain gardens, bioswales, and riparian corridors. Therefore, successfully characterizing those design details and associated management practices, interactions, and impacts requires a detailed understanding of how fine and course-scale hydrologic processes and routing are altered and managed in urban watersheds. To enhance hydrologic modeling capabilities of urban watersheds, we implemented a number of improvements to an existing ecohydrology model called VELMA—Visualizing Ecosystem Land Management Assessments—including the addition of spatially explicit engineered features that impact urban hydrology (e.g., impervious surfaces, curbed roadways, stormwater routing) and refinement to the computational representations of evapotranspiration by adding impervious surface evaporation. We demonstrate improved capabilities for modeling within complex urbanized watersheds by simulating stream runoff within the Longfellow Creek watershed, City of Seattle, Washington (WA), United States (US) with and without these added urban watershed characteristics. The results demonstrate that the newly improved VELMA model allows for more accurate modeling of hydrology within urban watersheds. Being a fate and transport ecohydrology model, the improved hydrologic flow enhances VELMA’s current capacity for modeling nutrient, contaminant, and thermal loadings.
由于城市化地区是极其复杂的动态景观，其中包括工程特征，根据设计，这些特征可加速城市径流流向溪流、小河和其他水体，以减少暴雨事件中的城市洪涝灾害，因此很难对场地级绿色和灰色雨水修复行动所带来的大规模水文影响进行建模。许多城市社区使用大量工程化的灰色基础设施来实现这一目标，最近还增加了雨水花园、生物渠和河岸走廊等绿色基础设施。因此，要成功描述这些设计细节和相关的管理方法、相互作用和影响，就必须详细了解城市流域中精细和河道尺度的水文过程和路由是如何改变和管理的。为了提高城市流域的水文建模能力，我们对现有的生态水文模型 VELMA（可视化生态系统土地管理评估）进行了一系列改进，包括增加影响城市水文的空间显式工程特征（如不透水表面、有路缘石的道路、雨水路由），以及通过增加不透水表面蒸发来完善蒸散的计算表述。我们通过模拟美国华盛顿州西雅图市 Longfellow Creek 流域内的溪流径流，展示了在复杂的城市化流域内建模能力的提高，包括添加和不添加这些城市流域特征。结果表明，新改进的 VELMA 模型能够更准确地模拟城市流域内的水文情况。作为一种归宿和迁移生态水文学模型，改进后的水文流增强了 VELMA 目前对营养物、污染物和热负荷进行建模的能力。
{"title":"Improved urban runoff prediction using high-resolution land-use, imperviousness, and stormwater infrastructure data applied to a process-based ecohydrological model","authors":"Jonathan J. Halama, R. McKane, Bradley Barnhart, Paul P. Pettus, Allen Brookes, K. Djang, Vivian Phan, Sonali Chokshi, James Graham","doi":"10.1371/journal.pwat.0000155","DOIUrl":"https://doi.org/10.1371/journal.pwat.0000155","url":null,"abstract":"Modeling large-scale hydrological impacts brought about by site-level green and gray stormwater remediation actions is difficult because urbanized areas are extremely complex dynamic landscapes that include engineered features that, by design, expedite urban runoff to streams, creeks, and other water bodies to reduce urban flooding during storm events. Many urban communities use heavily engineered gray infrastructure to achieve that goal, along with more recent additions of green infrastructure such as rain gardens, bioswales, and riparian corridors. Therefore, successfully characterizing those design details and associated management practices, interactions, and impacts requires a detailed understanding of how fine and course-scale hydrologic processes and routing are altered and managed in urban watersheds. To enhance hydrologic modeling capabilities of urban watersheds, we implemented a number of improvements to an existing ecohydrology model called VELMA—Visualizing Ecosystem Land Management Assessments—including the addition of spatially explicit engineered features that impact urban hydrology (e.g., impervious surfaces, curbed roadways, stormwater routing) and refinement to the computational representations of evapotranspiration by adding impervious surface evaporation. We demonstrate improved capabilities for modeling within complex urbanized watersheds by simulating stream runoff within the Longfellow Creek watershed, City of Seattle, Washington (WA), United States (US) with and without these added urban watershed characteristics. The results demonstrate that the newly improved VELMA model allows for more accurate modeling of hydrology within urban watersheds. Being a fate and transport ecohydrology model, the improved hydrologic flow enhances VELMA’s current capacity for modeling nutrient, contaminant, and thermal loadings.","PeriodicalId":93672,"journal":{"name":"PLOS water","volume":"153 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139259699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-15DOI: 10.1371/journal.pwat.0000183
Madison Ferrebee, Erika Osborne, Emily Garner
Various spatiotemporal, hydraulic, and water quality parameters can affect the microbial community composition of water within drinking water distribution systems (DWDSs). Although some relationships between various paravmeters and microbial growth are known, the effects of spatial and temporal trends on particle-associated microbial communities in chlorinated DWDSs remain poorly understood. The objectives of this study were to characterize the microbial community composition of both particle-associated bacteria (PAB) and total bacteria (TB) within a full-scale chlorinated DWDS, and assess relationships between microbiavvl community and various spatiotemporal, hydraulic, and water quality parameters. Bulk water samples were collected from the treatment plant, a storage tank, and 12 other sites in a rural chlorinated DWDS at varying distances from the treatment plant on four sampling dates spanning six months. Amplicon sequencing targeting the 16S rRNA gene was performed to characterize the microbial community. Gammaproteobacteria dominated the DWDS, and hydraulic parameters were well-correlated with differences in microbial communities between sites. Results indicate that hydraulic changes may have led to the detachment of biofilms and loose deposits, subsequently affecting the microbial community composition at each site. Spatial variations in microbial community were stronger than temporal variations, differing from similar studies and indicating that the highly varied hydraulic conditions within this system may intensify spatial variations. Genera containing pathogenic species were detected, with Legionella and Pseudomonas detected at every site at least once and Mycobacterium detected at most sites. However, only one sample had quantifiable Pseudomonas aeruginosa through quantitative polymerase chain reaction (qPCR), and no samples had quantifiable Legionella pneumophila or Mycobacterium avium, indicating a low human health risk. This study establishes spatial variations in PAB associated with varied hydraulic conditions as an important factor driving microbial community within a chlorinated DWDS.
{"title":"Spatiotemporal trends in particle-associated microbial communities in a chlorinated drinking water distribution system","authors":"Madison Ferrebee, Erika Osborne, Emily Garner","doi":"10.1371/journal.pwat.0000183","DOIUrl":"https://doi.org/10.1371/journal.pwat.0000183","url":null,"abstract":"Various spatiotemporal, hydraulic, and water quality parameters can affect the microbial community composition of water within drinking water distribution systems (DWDSs). Although some relationships between various paravmeters and microbial growth are known, the effects of spatial and temporal trends on particle-associated microbial communities in chlorinated DWDSs remain poorly understood. The objectives of this study were to characterize the microbial community composition of both particle-associated bacteria (PAB) and total bacteria (TB) within a full-scale chlorinated DWDS, and assess relationships between microbiavvl community and various spatiotemporal, hydraulic, and water quality parameters. Bulk water samples were collected from the treatment plant, a storage tank, and 12 other sites in a rural chlorinated DWDS at varying distances from the treatment plant on four sampling dates spanning six months. Amplicon sequencing targeting the 16S rRNA gene was performed to characterize the microbial community. Gammaproteobacteria dominated the DWDS, and hydraulic parameters were well-correlated with differences in microbial communities between sites. Results indicate that hydraulic changes may have led to the detachment of biofilms and loose deposits, subsequently affecting the microbial community composition at each site. Spatial variations in microbial community were stronger than temporal variations, differing from similar studies and indicating that the highly varied hydraulic conditions within this system may intensify spatial variations. Genera containing pathogenic species were detected, with Legionella and Pseudomonas detected at every site at least once and Mycobacterium detected at most sites. However, only one sample had quantifiable Pseudomonas aeruginosa through quantitative polymerase chain reaction (qPCR), and no samples had quantifiable Legionella pneumophila or Mycobacterium avium, indicating a low human health risk. This study establishes spatial variations in PAB associated with varied hydraulic conditions as an important factor driving microbial community within a chlorinated DWDS.","PeriodicalId":93672,"journal":{"name":"PLOS water","volume":"16 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139273138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-14DOI: 10.1371/journal.pwat.0000204
Jamiat Nanteza, Brian Thomas, Jesse Kisembe, Rhoda Nakabugo, Paul Isolo Mukwaya, Matthew Rodell
{"title":"Correction: A Google Earth-GIS based approach to examine the potential of the current rainwater harvesting practices to meet water demands in Mityana district, Uganda.","authors":"Jamiat Nanteza, Brian Thomas, Jesse Kisembe, Rhoda Nakabugo, Paul Isolo Mukwaya, Matthew Rodell","doi":"10.1371/journal.pwat.0000204","DOIUrl":"https://doi.org/10.1371/journal.pwat.0000204","url":null,"abstract":"","PeriodicalId":93672,"journal":{"name":"PLOS water","volume":"15 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134991621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-14DOI: 10.1371/journal.pwat.0000197
Devin F. Smith, W. Berry Lyons, Tiernan Henry, Raymond Flynn, Anne E. Carey
Intense weather events are projected to increase as a consequence of climate change. The summer 2018 drought in Europe impacted human health, ecosystems, and economic prosperity. Even locations with an abundance of fresh water, like Ireland, faced water restrictions due to depleted supplies. To characterize the effect of the 2018 drought on Irish rivers, we collected surface water samples from rivers across the island at the drought onset and termination. We analyzed samples for stable water isotopes δ 18 O and δ 2 H and calculated the fraction of evaporation from river groundwater and precipitation inflow (E/I) of rivers. We extended river δ 18 O and δ 2 H analysis to 2020 for rivers in two catchments, Corrib and Shannon, to investigate how Irish river systems respond to high precipitation events, and the role of loughs (lakes) in the system. River δ 18 O and δ 2 H values showed progressive depletion from west to east in response to precipitation depletion from airmasses arriving off the Atlantic Ocean. From onset to termination of the 2018 drought, river δ 18 O and δ 2 H values were enriched and the calculated E/I value increased for most rivers. D-excess were negatively correlated with E/I value, providing support for E/I calculations. Extended analysis of loughs along the Corrib and Shannon river systems showed that lough Corrib consistently induced isotopic enrichment, while loughs in the Shannon catchment inconsistently caused isotopic enrichment. Both systems exert control over river isotopic composition in hydrologic extremes. Findings promote additional research in hydrologic patterns in response to increasing frequency of floods and droughts.
{"title":"Irish surface water response to the 2018 drought","authors":"Devin F. Smith, W. Berry Lyons, Tiernan Henry, Raymond Flynn, Anne E. Carey","doi":"10.1371/journal.pwat.0000197","DOIUrl":"https://doi.org/10.1371/journal.pwat.0000197","url":null,"abstract":"Intense weather events are projected to increase as a consequence of climate change. The summer 2018 drought in Europe impacted human health, ecosystems, and economic prosperity. Even locations with an abundance of fresh water, like Ireland, faced water restrictions due to depleted supplies. To characterize the effect of the 2018 drought on Irish rivers, we collected surface water samples from rivers across the island at the drought onset and termination. We analyzed samples for stable water isotopes δ 18 O and δ 2 H and calculated the fraction of evaporation from river groundwater and precipitation inflow (E/I) of rivers. We extended river δ 18 O and δ 2 H analysis to 2020 for rivers in two catchments, Corrib and Shannon, to investigate how Irish river systems respond to high precipitation events, and the role of loughs (lakes) in the system. River δ 18 O and δ 2 H values showed progressive depletion from west to east in response to precipitation depletion from airmasses arriving off the Atlantic Ocean. From onset to termination of the 2018 drought, river δ 18 O and δ 2 H values were enriched and the calculated E/I value increased for most rivers. D-excess were negatively correlated with E/I value, providing support for E/I calculations. Extended analysis of loughs along the Corrib and Shannon river systems showed that lough Corrib consistently induced isotopic enrichment, while loughs in the Shannon catchment inconsistently caused isotopic enrichment. Both systems exert control over river isotopic composition in hydrologic extremes. Findings promote additional research in hydrologic patterns in response to increasing frequency of floods and droughts.","PeriodicalId":93672,"journal":{"name":"PLOS water","volume":"14 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134991622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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