Dissertations / Theses on the topic 'Water supply security'
To see the other types of publications on this topic, follow the link: Water supply security.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 39 dissertations / theses for your research on the topic 'Water supply security.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Iskandarani, Maria. "Economics of household water security in Jordan /." Frankfurt am Main ; New York : P. Lang, 2002. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=009613010&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full text
2
Van, Rensburg Francois. "Urban water security in the city of Windhoek." Thesis, Stellenbosch : Stellenbosch University, 2006. http://hdl.handle.net/10019.1/50671.
Full textAbstract:
Thesis (MPhil)--Stellenbosch University, 2006.ENGLISH ABSTRACT: Urbanisation is a complex phenomenon and is a trend witnessed across the globe. Africa particularly has been experiencing the world’s most rapid rate of urbanization and cities are faced with the resulting pressure on natural resources. Water is one of the resources under pressure and the provision thereof is complicated by the deteriorating quality and quantity thereof. This study takes a brief look at the water situation in a water scarce region in Africa and concentrates on the urban water supply sector. It takes an in depth look at the measures used to secure water supply to a city in this very dry part of the world. The area under study is Windhoek, the capital of Namibia, situated in the southwestern corner of Africa. Namibia is the driest country in Sub-Saharan Africa and is characterised by a semi-arid nature, which results in a very hot and dry climate with erratic rainfall patterns. Windhoek has a low average rainfall associated with very high evaporation rates. No permanent water bodies exist near the city and the bulk of Windhoek’s water supply comes from storage dams quite a distance from the capital. Most of these sources of supply have been developed and are nearing the limit of their potential. A desperate need therefore exists to develop reliable additional water resources to secure the water supply especially during periods of prolonged drought. The case study gives examples of the initiatives taken by water authorities to improve the security of supply and keep up with the growing demand in the city. These initiatives include a dual pipe system for the distribution of semi-purified sewage for irrigation, reclamation of domestic sewerage, aquifer recharge and the implementation of Water Demand Management principles. An analysis of the most efficient and cost-effective means of supply augmentation namely aquifer recharge, have been balanced against the potential water savings of Water Demand Management in the city. The study also takes a brief look at the principles of Integrated Water Resource Management and how it is incorporated in the strategies used to augment supply to the city. The research found aquifer recharge as the most efficient and cost-effective means to augment supply to the city and together with Water Demand Management creates an approach complying with the goals of Integrated Water Resource management. The study concludes by identifying gaps in demand management in the city. It also suggests relevant recommendations on how to increase the effectiveness of Water Demand management.
AFRIKAANSE OPSOMMING: Verstedeliking is ‘n komplekse verskynsel en ‘n tendens wat regoor die wêreld voorkom. Die hoogste voorkoms van verstedeliking vind in Afrika plaas wat groot druk plaas op die natuurlike hulpbronne van stede. Water is een van die hulpbronne onder druk en die voorsiening daarvan word bemoeilik deur die verswakking van die kwaliteit en die beskikbaarheid daarvan. Hierdie studie konsentreer op die watersituasie in ‘n waterskaars streek in Afrika en die stedelike watervoorsieningssektor. Dit behels ‘n in diepte ondersoek na metodes wat gebruik word om die watervoorraad van die stad te verseker in hierdie droogte gesteisterd deel van die wêreld. Die gebied onder bespreking is Windhoek, die hoofstad van Namibië, wat geleë is in die Suidwestelike deel van Afrika. Namibië is die droogste land in die Sub-Saharastreek en word gekenmerk deur gereelde droogtes met ‘n gepaardgaande warm droë klimaat en onreëlmatige reënvalpatrone. Windhoek word gekenmerk deur ‘n lae gemiddelde reënval met ‘n baie hoë verdampingstempo. Geen permanente waterbronne kom in die nabyheid van die stad voor nie en die watervoorraad word gestoor in opgaardamme wat redelik ver van die hoofstad geleë is. Hierdie voorsieningsbronne is voortdurend in gebruik en die voorraad is beperk. Daar onstaan dus ‘n dringende behoefte aan betroubare bykomende waterbronne om voortdurende voorsiening aan die stad te verseker veral gedurende aanhoudende droogtes. Die gevallestudie konsentreer op voorbeelde en inisiatiewe wat deur die Water Owerhede geneem word om die voorsiening van water, aan die immergroeiende behoeftes van die stad te verbeter en te verseker. Hierdie pogings sluit in,‘n dubbele pyplynsisteem vir die verspreiding van halfgesuiwerde rioolwater vir besproeiingsdoeleindes, herwinning van huishoudelike rioolwater, herlaai van ondergrondse watervoorraad en die implimentering van wateraanvraag bestuursmaatreëls. Die geskiktste en mees koste-effektiewe metode van verhoogde watervoorsiening naamlik die herlaai van ondergrondse waterbronne, is ontleed, en die voordele opgeweeg teen die potensiële waterbesparing deur die Bestuur van Wateraanvraag in die stad. Daar is ook kortliks gekyk na die beginsels van Geintigreerde Water Bronne Bestuur en hoe dit by bestaande strategieë ingelyf is om uitbreiding van voorsiening aan die stad te verseker. Die navorsing het bevind dat die herlaai van ondergrondse waterbronne as die geskikste en mees koste-effektiewe metode beskou kan word om die verhoogde aanvraag van die stad die hoof te bied. Die studie word afgesluit deur die tekortkominge in die Water Aanvraagbestuur van die stad te identifiseer. Relevante aanbevelings word gemaak van hoe om die effektiwiteit van hierdie betrokke strategie te verbeter.
3
Ramirez, Christina M. "Water security and its importance in protecting public health." Scholarly Commons, 2012. https://scholarlycommons.pacific.edu/uop_etds/820.
Full text
4
Taffarello, Denise. "Water security and ecosystem-based adaptation in the headwaters of Cantareira Water Supply System, Brazil." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-05042017-091421/.
Full textAbstract:
Water quantity, availability and, particularly, quality of Brazilian freshwater is under progessive degradation due to Anthropocene\'s environmental changing conditions. Strategies of Ecosystem-based Adaptation (EbA) are essential to mitigate these impacts. This Ph.D. thesis proposes a new model of water resources management, thereby integrating selfpurification and ecohydrologic processes to evaluate ecosystem services from watershed under change. In Chapter 2, this thesis examinates the payment for hydrologic cosystem services (Water-PES) in Brazilian Atlantic Forest and points ecohydrologic variables useful for assessing and further valuing hydrologic services. In Chapter 3, this thesis discusses proposals for freshwater monitoring plan which integrate quali-quantitative aspects for EbA and Water-PES projects. Therefore, in Chapter 4 experimental quali-quantative freshwater data from in-situ field observations are investigated according land-use/land-cover (LULC) in headwaters of water supply systems. In Chapter 5, through simulated impacts on freshwater yield from scenarios of LULC change, the grey water footprint (greyWF) is assessed, as well as environmental sustainability of sub-basins is depicted from a new ecohydrologic index for assessing hydrologic services. The methodology is performed using through field sampling and lab-analysing of physico-chemical, biologic and hydraulic variables in nested sub-basins draining to the Cantareira Water Supply System, in Sao Paulo and Minas Gerais states, Brazil. These areas participate in the Water-PES projects Water Producer/PCJ and Water Conservator at headwaters of Piracicaba watershed, during recent severe drought conditions between years 2013-15. The greyWF is estimated from outputs of time series simulated through ecohydrologic model Soil and Water Assessment Tool (SWAT). Under assumption of continuity of Water-PES projects, and using the same series of hydrometorological records for a common period (2008-2014), freshwater quali-quantitative impacts are performed through three LULC scenarios: past situation \"S1\" (year 1990), current situation \"S2\" (year 2010) and future situation \"S2+EbA\" (year 2035). From these scenarios, flow and load duration curves, mean water yields, greyWF and seasonal variabilities, were simulated. Through this research, continuous-monitoring Data Collecting Stations were installed in public-private partnership encompassing EESC/USP, ANA, CPRM, CEMADEN, SMA, TNC, WWF and local mayors. This continuous monitoring is addressed to increase the system resilience, based on better decision-making for water security, in strategic headwaters not only for water supply, but also for environmental conservation. This doctoral thesis brings contributions to a better comprehension of anthropic impacts on water resources and for strategies of EbA in front of progressive rates of losses of ecosystem services. This PhD. thesis was part of three research initiatives which partly granted activities: (1) Thematic Project FAPESP 2008/58161-1 \"Assessment of Impacts and Vulnerability to Climate Change in Brazil and Strategies for Adaptation Options\"; (2) \"INCLINE - INterdisciplinary CLimate INvEstigation Center\" (NapMC/USP Núcleo de Apoio às Pesquisas em Mudanças Climáticas) and (3) \"Água Brasil\" Project, Banco do Brasil Foundation, WWF Brazil, ANA & FIPAI/EESC-USP.A quantidade, a disponibilidade e, em particular, a qualidade da água doce está em degradação progressiva devido às mudanças ambientais no Antropoceno. Estratégias de adaptação baseadas em ecossistemas (EbA) são essenciais para reduzir estes impactos. Propõe-se um novo modelo de gerenciamento de recursos hídricos que integre a pegada hídrica cinza e processos ecohidrológicos para avaliação dos serviços hidrológicos em bacias hidrográficas sob mudanças. As etapas da pesquisa são: Capítulo 2 – análise dos projetos de pagamentos por serviços ambientais de proteção às bacias hidrográficas na Mata Atlântica brasileira e, no contexto de EbA, indicação de variáveis ecohidrológicas úteis na quantificação e futura valoração dos serviços hidrológicos; Capítulo 3 – desenvolvimento de plano de monitoramento ecohidrológico que integra aspectos qualitativos e quantitativos dos recursos hídricos para projetos de EbA; Capítulo 4 – provisão de dados experimentais de qualidade e quantidade da água, além de observações in-situ, para investigação das influências das mudanças de uso e ocupação do solo nas cabeceiras de mananciais, estratégicos para o abastecimento público e a conservação ambiental; Capítulo 5 – estimativas da pegada hídrica cinza para nitrato, fósforo total e sedimentos a partir do monitoramento de variáveis quali-quantitativas em bacias com diferentes condições de uso e ocupação de solo. Foi realizada a instalação de três Plataformas de Coleta de Dados, por meio de parceria entre EESC, ANA, CPRM, CEMADEN, SMA, TNC e WWF, visando aumentar a resiliência do sistema, decorrente de futuro aprimoramento da gestão, para a segurança hídrica. A metodologia incluiu coletas em seis diferentes períodos, durante dois anos, e análises das variáveis condutividade elétrica, cor, DQO, DBO5,20, nitrato, nitrito, nitrogênio amoniacal, fosfato, pH, turbidez, sólidos totais, coliformes termotolerantes, Escherichia coli, medidas de vazões e velocidades médias em seções transversais. O método foi aplicado em microbacias participantes dos projetos Produtor de Água/PCJ e Conservador das Águas, dentre outras, com áreas de drenagem entre 7 e 1.000 km2, que contribuem para a bacia do rio Piracicaba (12.530 km2). Dados primários, medidos em recente período de severa estiagem no Sistema Cantareira (2013-14), foram integrados aos bancos de dados de órgãos gestores federais e estaduais. A produção de água foi maior em sub-bacias menos florestadas. Foi possível aprimorar a regionalização de cargas poluidoras por área de drenagem na região do Cantareira. A pegada hídrica cinza (WF) foi estimada a partir de simulações no modelo ecohidrológico Soil and Water Assessment Tool (SWAT). Curvas de permanência de vazões e carga poluidora por área de drenagem foram elaboradas. Supondo-se a continuidade dos projetos \"Produtor de Água/PCJ\" e \"Conservador das Águas\", foram investigados os impactos de cenário futuro de uso do solo. Finalmente, foi desenvolvido novo índice ecohidrológico para quantificação dos serviços hidrológicos e avaliação a sustentabilidade das sub-bacias, a partir da pegada hídrica cinza composta. Assim, usando ferramentas de vanguarda tecnológica (SWAT e WF), a tese fornece subsídios para uma melhor compreensão dos impactos antropogênicos sobre os recursos hídricos e novas estratégias de adaptação baseada em ecossistemas, frente às progressivas taxas de perda de serviços ambientais. Esta tese esteve vinculada a três projetos de pesquisa, dos quais obteve apoio financeiro: (1) Projeto Temático FAPESP 2008/58161-1 \"Assessment of Impacts and Vulnerability to Climate Change in Brazil & Strategies for Adaptation Options\"; (2) \"INCLINE - INterdisciplinary CLimate INvEstigation Center\" (NapMC/USP) e (3) Projeto \"Água Brasil\", Fundação Banco do Brasil, WWF Brasil, ANA e FIPAI/EESC-USP.
5
Cortés, Calderón Sofía Valeria. "Embracing complexity: Dynamics governing urban drinking water supply security in Mexico City." Thesis, Stockholms universitet, Stockholm Resilience Centre, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-188976.
Full textAbstract:
Drinking water supply insecurity is globally on the rise, and prevalent in most low and middle-income urban areas. Multiple responses have emerged to cope with the lack of a reliable and equitable supply of safe and sufficient drinking water in cities, which presents a wide range of social-ecological implications. Yet, many of the analyses to date are focused on predominantly technological, ecological, and economic perspectives, overlooking broader cultural and political dimensions. What are the elements and the interrelationship between them that sustain the lack of drinking water supply security at an urban scale? The empirical case study is located in Mexico City, the capital city of one of the most drinking water-insecure countries globally and among the world’s five largest metropolitan areas. Qualitative data is elicited from a literature review and semi-structured interviews with key experts and urban stakeholders. The results provide an integrated understanding of the proposed system structure that created and maintain the water supply problem in the long-term. Hindrances include knowledge lock-ins and critical dynamics that inhibit the political support to transition towards a drinking water security scenario. This study shows that drinking water supply crisis in the study area and other cities with similar conditions need to be understood as multi-dimensional and from a system perspective, by challenging underlying assumptions and embracing interconnectedness. Key feedback mechanisms are presented in causal loop diagrams, allowing the exploration of higher-order leverage points to reduce existing path-dependencies as one increasingly important research area, and potentially relevant for decision-makers.
6
Torres, Jacob Manuel. "Analyzing risk and uncertainty for improving water distribution system security from malevolent water supply contamination events." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2696.
Full text
7
Reed, Randall. "Dehydrated national security water scarcity, the emerging threat of the 21st century /." CLICK HERE TO VIEW:, 2004. https://research.maxwell.af.mil/papers/ay2004/ari/Reed.pdf.
Full text
8
Osei-Asare, Yaw. "Household Water Security and Water Demand in the Volta Basin of Ghana /." Frankfurt am Main [u.a.] : Lang, 2005. http://www.gbv.de/dms/zbw/491615132.pdf.
Full text
9
Hanna, Ramy W. Lofty. "Water security mercantilism? : transnational state-capital alliances & multi-level hydropolitics of land-water investments in Egypt and the Nile Basin." Thesis, University of Sussex, 2019. http://sro.sussex.ac.uk/id/eprint/81219/.
Full textAbstract:
Conventionally, the question of Egyptian water security focused on state-centric transboundary hydropolitics within the larger context of the Nile basin. The presented research explores 'water security' beyond this 'state-centric epistemology', typically focusing on a singular scale of hydropolitical analysis. This dissertation examines the water (hydro) politics of transnational land-water investments (LWI) within Egypt and the larger context of the Nile river basin. Adopting a multi-site case study methodology, it critically examines the changing role of the state and the engagement of non-state actors in the silent appropriation of land-water resources through investments in farmlands abroad. The research methodology contextualizes how land acquisitions take several shapes and forms within Egypt (Old-New Lands and New Lands/Mega Projects), as well as in other Nile basin countries (e.g. Sudan). They also manifest land-water-food nexus interdependencies for both; profit and larger strategic objectives, through the formation of 'State-Capital alliances'. Deploying a case study of an international Emirati investor in Egypt, it shows how land-water investments are rooted in a larger socio-political project as part of the state's vision of horizontal expansion and land reclamation, to address its ecological-demographic narrative of crisis. The research also draws linkages between Egyptian water security and transnational investments in other Nile basin countries with a particular focus on the case of Sudan as part of its larger vision of the 'breadbasket of the Arab World'. However, while these State-Capital alliances are rooted in narratives of state modernization, security, and profit, they entail various tensions and trade-offs amongst different resources nexi and actors, thus masking larger questions of social justice and equity. These tensions often reflect the manufacture of abundance and translate into water grabs transcending multiple hydropolitical scales. The thesis argues that the changing role of the "entrepreneurial state" and the engagement of non-state actors in transnational land-water investments manifest a transition from the hydraulic mission towards water security mercantilism. I argue that "water security mercantilism" denotes water grabbing, which overrides the conventional understanding of the hydraulic mission (water control by the state); towards a broader understanding of the role of non-state actors and international investors in accessing water, thus creating their own private resources security nexus. Hence, drawing on development studies, hydropolitics, and political economy scholarship, this dissertation broadens out the analysis of Egyptian water security beyond singular-scale state-centric hydropolitical debates; towards a multi-level polycentric analysis of water security, central to which are the farmers, the investors, and the state itself. This implies that transnational land-water investments not only influence small farmers through the reproduction of scarcity on the local level, but also influence the hydraulic mission of the state on the national level, and the larger Nile basin transboundary hydropolitics.
10
Preston, Ian Robert. "Water supply development decision-making in South Africa." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/d1020848.
Full textAbstract:
Balancing water demand and supply in South Africa involves high levels of uncertainty. The Department of Water and Sanitation (DWS) is responsible for making decisions to either increase water supply or decrease water demand so as to ensure that sufficient water is available, when and where it is needed. However, no retrospective analyses of such decisions have been found. One way to assess such decisions is to evaluate the associated costs and benefits thereof. Therefore the primary aim of this study is to evaluate the costs and benefits of selected water supply options, and of the decision-making associated with those options. In order to achieve this purpose, four case studies were analysed within a mixed-methods research paradigm, which used both quantitative and qualitative methods, including unit reference value (URV) analysis, inter- and intra-case analysis and content analysis to examine the success of the decisions made. The four case studies were conducted on the Inyaka, Nandoni, Berg and De Hoop dams and their catchments. Firstly, estimated and actual project costs were compared using unit reference analysis and inter-case analyses. Secondly, the reduction of mean annual runoff (MAR) caused by invasive alien plants (IAPs) and the cost of clearing them in the dam catchments were evaluated using inter-case analyses. Information thus gathered was used together with data from DWS documentation and the results of interviews with ten key specialists, to analyse the decision-making process that led to the decision to build De Hoop Dam (the most recent case study). The rational decision-making model (RDMM) was used as a framework within which to analyse and evaluate this decision-making process. This study has also demonstrated how the RDMM can be used to assess decision-making associated with water supply development. The results of this study show that there is considerable variation of estimated costs (at the time that the decision to build the dam was taken) in relation to the actual costs of building the dams and that Ministers were not put in a position to understand the full long-term costs or the opportunity costs of the proposed dams. Furthermore, the most recent IAP data (2008) shows that the impact on water security by IAPs could not offset the water security resulting from building each of the four dams. However, if IAP management is not continued in these catchments, the projected reduction of MAR by IAPs will compromise water security within 45 years. Given the almost exponential spread and densification of IAPs, together with their long-term impact on MAR and increased costs of controlling them, it is clear that IAP management should have been factored into water supply decision-making from the outset. In the analysis of the decision to build the De Hoop Dam, the results show that while the decision-making process that culminated in the decision to build the dam did not follow the steps of the RDMM, DWS appears to have followed a somewhat similar approach. It was found that while there was a need for the provision of additional water in the Olifants catchment, this need was overstated and the resulting overestimation caused the scale and size of the dam to be larger than it could and probably should have been. Additionally, it appears that DWS‘s decision to build the De Hoop Dam themselves, rather than having it built by the private sector, may have been less than optimal. It is recommended that, in future decision-making, DWS needs to incorporate multiple alternative options into the same solution, and to ensure that decision-makers are put into a position to make informed decisions, including adequate consideration of externalities. Furthermore, DWS needs to employ decision-making models such as the RDMM to facilitate retrospective analyses to improve their institutional knowledge. Keywords: water resources management, dams, invasive alien plants, decision-making, unit reference values, rational decision-making model.
11
Barry, Christopher James. "Regional modelling to forecast the transient chlorinated solvent risk to groundwater for water supply security." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8716/.
Full textAbstract:
The UK has an environmental legacy of chlorinated solvent contamination from historic industrial activity. Groundwater in Permo-Triassic Sandstone aquifers has been widely impacted. Future use of this resource requires methods to forecast regional-scale chlorinated solvent risk to groundwater assets. Current methods do not adequately represent chlorinated solvent dense non-aqueous phase liquid (DNAPL) source term behaviour and transient contaminant transport. This research investigates the hypothesis that improvements for regional contamination forecasting methods are possible and necessary. Experimentation with particle-based transport solutions shows that neglect of spatial dispersion is over-simplistic, especially where there are complex interactions between capture zones of different receptors. A fully dispersing Lagrangian solution, dynamic random walk (DRW), is developed that accurately models contaminant migration even with coarse-gridded flow models. For representation of the source term, a review of research into DNAPL behaviour is conducted. It is not feasible to derive a generic model for DNAPL dissolution into groundwater based on readily derived metrics at the regional scale. Therefore, a source term framework is developed that tests multiple conceptual models of DNAPL behaviour and therefore gives a holistic uncertainty analysis. Two case studies, based in historically industrial catchments in Birmingham and Stourbridge, validate the combined use of the DNAPL source term framework and the DRW transport solution. Chlorinated solvent sources are persistent, but careful asset planning informed by these regional risk modelling tools- DRW and the DNAPL source term framework -could allow continued use of solvent-impacted groundwater bodies.
12
Truelove, Yaffa Elane. "Gray zones : water, power and practice in everyday Delhi." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709326.
Full text
13
Turton, Anthony. "The political aspects of institutional developments in the water sector South Africa and its international river basins /." Pretoria : [s.n.], 2003. http://upetd.up.ac.za/thesis/available/etd-06042004-110828.
Full text
14
Borgomeo, Edoardo. "Climate change and water resources : risk-based approaches for decision-making." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:a57a491f-96fb-4579-bd8a-ba7e86722dea.
Full textAbstract:
Water-resource managers are facing unprecedented challenges in accommodating the large uncertainties associated with climate change in their planning decisions. Integration of climate risk information is a pre-requisite for water resources planning under a changing climate, yet this information is often presented outside the decision-making context and in a way which is not relevant for the decision at hand. Furthermore, there is a lack of approaches that explicitly evaluate the impact of nonstationary climate change on decision-relevant metrics and variables. This thesis describes novel methods for incorporating uncertain information on climate change in water resources decision-making and estimating climate change-related risks in water resources systems. The main hypotheses of this thesis are that: (1) shifting away from planning approaches based on abstract supply-demand balance metrics towards risk-based approaches that quantify the frequency and severity of observable outcomes of concern to water users, such as water shortages, can help decision-makers establish preferences among actions and identify cost and climate risk reduction trade-offs (2) adopting risk-based planning methods allows water managers to characterize and account for different sources of uncertainty in the water planning process and to understand their impact on outcomes of value and decisions. To test these hypotheses, this thesis presents an analytic approach for (1) incorporating nonstationary climate change projections and other uncertain factors related to demand changes into water resources decision-making, (2) understanding trade-offs between benefits of climate risk-reduction and cost of climate change adaptation, and (3) characterizing water supply vulnerability to unprecedented drought conditions. The approach is applied to London's urban water supply system located in the Thames river basin, south-east of England. Results from this thesis demonstrate how a systematic characterization of uncertainties related to future hydro-climatic conditions can help decision-makers compare and choose between a range of possible water management options and decide upon the scale and timing of implementation that meet decision-makers' risk tolerability. Additionally, results show the benefits of combining climate information with vulnerability analysis to test decisions' robustness to unprecedented drought conditions. The application of the proposed methods to the London urban water supply system suggests that the risks of exceeding reliability targets in the future will increase if no further supply or demand side actions were to be taken. Results from the case study also show that changes in demand due to population growth could have greater impacts on water security than climate change and that small reductions in climate-related risk may come at significantly higher costs. It should be stressed that the results from the case study are based on a simplified representation of London's water supply system and that they should be further tested with the full system model employed by the water utility which implements more complex operational rules.
15
Rodrigues, Dulce Buchala Bicca. "Assessment of water security using conceptual, deterministic and stochastic frameworks." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-18122014-094354/.
Full textAbstract:
A comprehensive assessment of water security incorporates a range of water-related concepts, since water policy issues to specific technical aspects of hydrological conditions and their interactions with societal needs and ecosystem functioning. This doctoral thesis is organized into three chapters that address such range of water security-related topics, aiming to establish a conceptual baseline and propose deterministic and stochastic accounting frameworks for a river basin water security evaluation. Specific assumptions and research questions are defined in each chapter, and are related to the management of \'Cantareira water supply system\' (located in Southeastern Brazil), focusing on different scales and on its political and hydrological aspects as well. The first chapter acts as a conceptual baseline for water security assessment, by examining general aspects of the Brazilian water policy and water allocation system. This study contrasts Brazilian and American water management systems applied to water transfer projects, discussing experiences from the \'Cantareira system\' and Colorado river basin. A deterministic accounting framework is presented in the second chapter, which is based on management of blue and green water kinds (defined in accordance with hydrological processes and storage types), and demonstrates how a quantitative analysis of provisioning and use (abstraction and consumption) of both water kinds can be conducted. An agricultural basin (291 km²) within the Cantareira water supply system (located upstream of the Cachoeira reservoir) was used to illustrate this approach. The impact of blue and green water use on median water resources conditions is accounted by the scarcity indicator, while the vulnerability indicator considers the probability of low availability of water resources. In the third chapter quantifies and discusses the impacts of uncertainties on water security indicators (proposed in the chapter 2), based on a multi-model and resampling framework, that considers several uncertainty sources including those related to: i) observed streamflow data; ii) hydrological model structure; iii) residual analysis; iv) Environmental Flow Requirement methods; v) the definition of critical conditions for water provision; and vi) the critical demand imposed by human activities. Then, the uncertainty is propagated through different methodological arrangements applied to the same study basin of chapter 2. In brief, the first chapter indicates that both Brazilian and American water management system can potentially contribute to each other. In the second chapter, the Blue/Green water-based accounting framework reveal clear spatial and temporal patterns of water scarcity and vulnerability levels within the basin, thereby improving our understanding of how and where water-related threats to human and aquatic ecosystem security can arise (so called hot-spots). The third chapter provide a general method that can form basis for meaningful support to end-users facing water resource challenges by enabling them to incorporate a viable uncertainty analysis into a robust decision making process. Further investigation are proposed in each research step of this doctoral thesis.A avaliação da segurança hídrica pode incorporar vários conceitos relacionados à água, desde aspectos da política de recursos hídricos até questões hidrológicas específicas e suas interações com a sociedade e ecossistemas. Esta tese de doutorado busca estabelecer uma base conceitual e propor esquemas metodológicos com base determinística e estocástica para avaliação da segurança hídrica de bacias hidrográficas. Objetivos específicos são definidos em cada capítulo e relacionam-se à gestão do \'Sistema Cantareira de abastecimento de água\' (localizado no Sudeste do Brasil), com foco em diferentes escalas, bem como aspectos políticos e hidrológicos. O primeiro capítulo é apresentado como baseline conceitual, examinando aspectos gerais da política de recursos hídricos e sistemas alocação de água. Este estudo compara sistemas de gestão aplicados a projetos de transposição de água inter/intra-bacias no Brasil e Estados Unidos, discutindo experiências do Sistema Cantareira e da bacia do rio Colorado. O segundo capítulo, por sua vez, propõe e analisa um esquema metodológico determinístico baseado na gestão das águas azul e verde (definidas de acordo com processos hidrológicos e unidades de armazenamento). Este estudo demonstra como uma análise quantitativa da provisão e utilização de ambos os tipos de água pode ser conduzida, propondo indicadores de escassez e vulnerabilidade hídrica. Esta abordagem foi aplicada em uma bacia agrícola (291 km²), localizada a montante do reservatório Cachoeira, que é integrante do Sistema Cantareira. O terceiro capítulo quantifica e analisa os impactos das incertezas sobre os indicadores de segurança hídrica propostos no capítulo 2, utilizando um esquema metodológico estocástico baseado em múltiplos modelos e reamostragem, que incorpora variadas fontes de incerteza, tais como: i) dados observados de vazão; ii) estrutura do modelo hidrológico; iii) análise de resíduos do modelo hidrológico; iv) estimativa de vazão ambiental; v) definição de condições críticas de provisão e vi) demanda hídrica. Em seguida, as incertezas são propagadas através de diferentes arranjos metodológicos aplicados na mesma bacia estudo do capítulo 2. Em conclusão, o primeiro capítulo sugere uma potencial troca de contribuições provenientes de ambos os sistemas de gestão brasileiro e americano. O segundo capítulo revela padrões espaciais e temporais dos resultados dos indicadores de escassez e vulnerabilidade, melhorando assim a compreensão de como e onde ameaças à segurança hídrica podem surgir. Por sua vez, a análise de incertezas desenvolvida no terceiro capítulo é capaz de gerar suporte a gestores de recursos hídricos e processo de tomada de decisões robustas. Recomendações específicas são geradas em cada capítulo da presente tese de doutorado.
16
Sjömander, Magnusson Therése. "Urban Water Security – Local Conditions and Regional Context : A case study of attitudes and water use behaviour in Windhoek, Namibia." Doctoral thesis, Linköpings universitet, Tema vatten i natur och samhälle, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4893.
Full textAbstract:
The world is becoming urbanised. Between 1995 and 2025, it is estimated that the cities and towns of the developing world will have absorbed another two billion people. A majority of these people will be poor and settle down in the unregulated areas. It is therefore fair to say that the management and use of water in urban areas is a very complex and dynamic issue. The fact that cities in the South are composed of two systems, the regulated and the unregulated areas, and that considerable diversity exists between them, highlights the need for a context driven policy design in urban water management. For attaining urban water security in these cities, controlling water demand in the regulated areas while improving access to water of good quality in the unregulated areas must be a priority. This thesis is based on a case study of Windhoek, a city characterized by conditions of aridity, rapid urbanisation and primate city dominance. Since 1994, a thorough water demand management (WDM) strategy has been implemented in Windhoek, aiming at improving water use efficiency and to reduce water consumption through economic and non-economical measures. It has been the purpose to examine the development of urban water management along with urban growth, the response to WDM by the domestic and private business sectors, as well as challenges and benefits of allowing urban branch-lines along water transfer schemes. WDM can be an efficient tool in the struggle against luxury and non-efficient water use, to postpone bulk water investments and for cost-recovery. However, it is crucial that the incentives are based on and flexible according to socio-economic conditions, and that water managers acknowledge motives and attitudes that shape water use behaviour. One dilemma of WDM lies in the fact that if the supply capacity is increased, it is likely that demand will be adjusted accordingly. It is a tricky task to motivate water savings through demand management alongside with an improved water supply. Moreover, it is essential that savings are not only temporary, but also part of a long-term adjustment. Another predicament of WDM is that a high trust in water authorities actually lowered the efficiency of the strategy to meet the anticipated goal.
17
Asante-Wusu, Isaac. "GEOGRAPHY OF URBAN WATER SECURITY AND VULNERABILITY: CASE STUDIES OF THREE LOCALITIES IN THE ACCRA-TEMA CITY-REGION, GHANA." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1497868343954842.
Full text
18
Kaniaru, Wanjiku. "The impact of water as a security issue on the Middle East peace process: 1991-1996." Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1002995.
Full textAbstract:
In recent years, there has been increasing realisation that resource based conflicts constitute one of the most salient threats to the survival of mankind, namely, water. In particular, the fundamental link between water and security can no longer be ignored given the indispensable role of water in the sustenance of human life as well as crucial sectors of agriculture and industry. Since the flow of water does not respect political boundaries, co-operation in the utilisation of dwindling supplies remains the most sustainable option for the future in an era of ecological interdependence. This thesis endeavours to investigate the impact of water as a security issue on the Middle East peace process. This is done within the theoretical framework that is provided by the schools of complex interdependence and new security studies. With the demise of the cold war, and the emergence of an expanded security agenda, water is an important non-military threat especially in the Middle East region. However, even with an expanded security agenda, the case of the Middle East suggests that it remains difficult to discard the hierarchy of security issues advocated by the Realists. The ongoing debate between the schools of complex interdependence and Realism is instructive in determining whether co-operation over water issues, considered "low" politics, is attainable in the absence of resolving "high" politics concerns of territory and security. Given its profound security implications for the Middle East region, water has been accorded a central role in both the bilateral and multilateral peace negotiations. In the context of water scarcity, and rising demographic patterns, the role of water as a facilitator of regional co-operation remains critical. However, for multilateral co-operation over water resources to become a tangible reality, it is the contention of this thesis that both "low" politics issues of water and "high" polities concerns of territory as well as security must be addressed simultaneously.
19
Molony, Lara. "Water security amongst impoverished households in the Sundays River Valley Municipality : community experiences and perspectives." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018932.
Full textAbstract:
Water security is influenced by the complex interplay between ecological, socio-political, governance and water management systems. Achieving water security is essential for ensuring sustainable development, and challenges with water security are closely linked to the overall experience of poverty that many countries throughout the world, including South Africa, confront. These problems can broadly be understood through three main factors: water availability, access and usage; water governance and management underpin these factors. Water insecurity can often be seen in townships within South Africa, where water service delivery and water access is precarious. This study provides a lens into the water security experiences of two poor township communities in the Sundays River Valley Municipality (SRVM) namely Nomathamsanqa in Addo and Aquapark in Kirkwood. The research assessed water security patterns amongst RDP, township and informal settlement households serviced by the SRVM and found that communities face severe water security problems. Specifically, it was found that all township households encounter frequent water shortages, cuts in municipal water supply and water quality concerns. Issues around the payment for water and dissatisfaction with water service delivery also emerged. The purpose of this research was to allow for community experiences and perspectives to be expressed in an academic space that has previously been dominated by water management and policy makers. The study concludes that these communities within the SRVM experience significant challenges in securing safe water and these are largely due to social water scarcity issues and the difficulties the municipality faces concerning water service delivery.
20
Tirivarombo, Sithabile. "Climate variability and climate change in water resources management of the Zambezi River basin." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1002955.
Full textAbstract:
Water is recognised as a key driver for social and economic development in the Zambezi basin. The basin is riparian to eight southern African countries and the transboundary nature of the basin’s water resources can be viewed as an agent of cooperation between the basin countries. It is possible, however, that the same water resource can lead to conflicts between water users. The southern African Water Vision for ‘equitable and sustainable utilisation of water for social, environmental justice and economic benefits for the present and future generations’ calls for an integrated and efficient management of water resources within the basin. Ensuring water and food security in the Zambezi basin is, however, faced with challenges due to high variability in climate and the available water resources. Water resources are under continuous threat from pollution, increased population growth, development and urbanisation as well as global climate change. These factors increase the demand for freshwater resources and have resulted in water being one of the major driving forces for development. The basin is also vulnerable due to lack of adequate financial resources and appropriate water resources infrastructure to enable viable, equitable and sustainable distribution of the water resources. This is in addition to the fact that the basin’s economic mainstay and social well-being are largely dependent on rainfed agriculture. There is also competition among the different water users and this has the potential to generate conflicts, which further hinder the development of water resources in the basin. This thesis has focused on the Zambezi River basin emphasising climate variability and climate change. It is now considered common knowledge that the global climate is changing and that many of the impacts will be felt through water resources. If these predictions are correct then the Zambezi basin is most likely to suffer under such impacts since its economic mainstay is largely determined by the availability of rainfall. It is the belief of this study that in order to ascertain the impacts of climate change, there should be a basis against which this change is evaluated. If we do not know the historical patterns of variability it may be difficult to predict changes in the future climate and in the hydrological resources and it will certainly be difficult to develop appropriate management strategies. Reliable quantitative estimates of water availability are a prerequisite for successful water resource plans. However, such initiatives have been hindered by paucity in data especially in a basin where gauging networks are inadequate and some of them have deteriorated. This is further compounded by shortages in resources, both human and financial, to ensure adequate monitoring. To address the data problems, this study largely relied on global data sets and the CRU TS2.1 rainfall grids were used for a large part of this study. The study starts by assessing the historical variability of rainfall and streamflow in the Zambezi basin and the results are used to inform the prediction of change in the future. Various methods of assessing historical trends were employed and regional drought indices were generated and evaluated against the historical rainfall trends. The study clearly demonstrates that the basin has a high degree of temporal and spatial variability in rainfall and streamflow at inter-annual and multi-decadal scales. The Standardised Precipitation Index, a rainfall based drought index, is used to assess historical drought events in the basin and it is shown that most of the droughts that have occurred were influenced by climatic and hydrological variability. It is concluded, through the evaluation of agricultural maize yields, that the basin’s food security is mostly constrained by the availability of rainfall. Comparing the viability of using a rainfall based index to a soil moisture based index as an agricultural drought indicator, this study concluded that a soil moisture based index is a better indicator since all of the water balance components are considered in the generation of the index. This index presents the actual amount of water available for the plant unlike purely rainfall based indices, that do not account for other components of the water budget that cause water losses. A number of challenges were, however, faced in assessing the variability and historical drought conditions, mainly due to the fact that most parts of the Zambezi basin are ungauged and available data are sparse, short and not continuous (with missing gaps). Hydrological modelling is frequently used to bridge the data gap and to facilitate the quantification of a basin’s hydrology for both gauged and ungauged catchments. The trend has been to use various methods of regionalisation to transfer information from gauged basins, or from basins with adequate physical basin data, to ungauged basins. All this is done to ensure that water resources are accounted for and that the future can be well planned. A number of approaches leading to the evaluation of the basin’s hydrological response to future climate change scenarios are taken. The Pitman rainfall-runoff model has enjoyed wide use as a water resources estimation tool in southern Africa. The model has been calibrated for the Zambezi basin but it should be acknowledged that any hydrological modelling process is characterised by many uncertainties arising from limitations in input data and inherent model structural uncertainty. The calibration process is thus carried out in a manner that embraces some of the uncertainties. Initial ranges of parameter values (maximum and minimum) that incorporate the possible parameter uncertainties are assigned in relation to physical basin properties. These parameter sets are used as input to the uncertainty version of the model to generate behavioural parameter space which is then further modified through manual calibration. The use of parameter ranges initially guided by the basin physical properties generates streamflows that adequately represent the historically observed amounts. This study concludes that the uncertainty framework and the Pitman model perform quite well in the Zambezi basin. Based on assumptions of an intensifying hydrological cycle, climate changes are frequently expected to result in negative impacts on water resources. However, it is important that basin scale assessments are undertaken so that appropriate future management strategies can be developed. To assess the likely changes in the Zambezi basin, the calibrated Pitman model was forced with downscaled and bias corrected GCM data. Three GCMs were used for this study, namely; ECHAM, GFDL and IPSL. The general observation made in this study is that the near future (2046-2065) conditions of the Zambezi basin are expected to remain within the ranges of historically observed variability. The differences between the predictions for the three GCMs are an indication of the uncertainties in the future and it has not been possible to make any firm conclusions about directions of change. It is therefore recommended that future water resources management strategies account for historical patterns of variability, but also for increased uncertainty. Any management strategies that are able to satisfactorily deal with the large variability that is evident from the historical data should be robust enough to account for the near future patterns of water availability predicted by this study. However, the uncertainties in these predictions suggest that improved monitoring systems are required to provide additional data against which future model outputs can be assessed.
21
Рой, Ігор Олександрович, Игорь Александрович Рой, and Ihor Oleksandrovych Roi. "Інтенсифікація процесів окиснення органічних речовин у питному водопостачанні." Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/40089.
Full textAbstract:
Однією з основних складових національної безпеки населення
України, є екологічна безпека, яка в першу чергу полягає в забезпеченні
безпечних умов життєдіяльності населення, через управління небезпеками,
які виникають внаслідок функціонування антропогенних, природних і
техногенних систем. Сучасні проблеми забезпечення населення питною
водою мають першочергове значення і є суттєвим чинником, який визначає
стан національної безпеки в країні.
22
Hlanganise, Yoliswa Happiness. "Impact of in-field rainwater harvesting technology on household food security: a case of Guquka and Khayalethu villages in Central Eastern Cape Province." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/352.
Full textAbstract:
The aim of this investigation was to assess the impact of the In-Field Rainwater Harvesting technology on household food security in the study area. The study was conducted in Nkonkobe Local Municipality of the Amathole District Municipality in central Eastern Cape Province. The areas under investigation are Guquka and Khayaletu villages of the Thyume Valley, which is located about 30 kilometres north of Alice. The method used to assess the impact of the IRWH on household food security was a pair wise comparison method. During September 2009, there were 60 (34 in Guquka and 26 in Khayaletu) households who adopted the technology in home gardens. In order to get a clear picture of the impact of the technology on food security, a decision was taken to assess both the project members and non-project members, hence the pairwise comparison method. The non-project members (also 60 households) were selected randomly from those who were interviewed during the situation analysis in 2004. Five indicators were used to assess household food security. These were household income, expenditure on food, diet diversity, energy-protein intakes, and micro-nutrient intakes (Vitamin A, C and Iron). The income and expenditure data were collected from the 120 households. However, the detailed food data were collected from selected cases from both groups at different times (seasons) of the year. A case study approach was employed in data collection. A total of 12 cases (six households per village) were selected for this investigation. These were selected mainly according to the degree of poverty. The total of six households from each village comprised three project members and three non-members i.e. one from each poverty class (non- poor, poor and ultra-poor) in both categories. The data on the kinds of food products consumed by households was gathered using the food account method (FAM). The food consumed was then analysed for nutrient adequacy. The main findings of this investigation show the IRWH technology to have a positive impact on food security and nutrition of the project members. The technology made significant contributions to the amount of energy and vitamins A and C consumed by households especially during wet seasons. Substantial contributions of garden produce were noted among the project members. However, these contributions were not enough to ensure household food security. The results indicate that there are nutritional problems in the study area. Firstly, there is protein- v energy malnutrition mainly affecting the poor and the ultra-poor households. Secondly, there is hidden hunger affecting all poverty categories, even the non-poor households. This is mainly demonstrated by poor diet quality i.e. diet that lacks essential nutrients identified
23
Newkirk, Scott Hunter. "Detection levels of drinking water contaminants using field portable ultraviolet and visible light (uv/vis) spectrophotometry /." Download the thesis in PDF, 2005. http://www.lrc.usuhs.mil/dissertations/pdf/NEWKIRK2005.pdf.
Full text
24
Bernardeli, Millena Adrianna Formiga Dias. "Bacia do córrego São João & segurança hídrica do abastecimento urbano do município de Porto Nacional-TO." Universidade Federal do Tocantins, 2017. http://hdl.handle.net/11612/489.
Full textAbstract:
Esta dissertação teve como objetivo principal avaliar o nível de segurança hídrica do abastecimento público de Porto Nacional/TO, associado à quantidade e qualidade de água bruta da bacia do Córrego São João, seu único manancial de abastecimento. Adotou-se o modelo conceitual e metodológico desenvolvido pelo Grupo de Pesquisa “Água, Gestão e Segurança Hídrica em tempos de Mudanças Ambientais Globais”, do qual a autora é parte integrante. O modelo baseia-se no conceito de segurança hídrica associado, de um lado, a riscos qualiquantitativos da água bruta no ponto de captação e, de outro lado, na sua compatibilidade com o sistema de abastecimento público, em particular os subsistemas de captação e tratamento. Dessa forma, foi possível avaliar, de forma qualitativa, a segurança hídrica do abastecimento de Porto Nacional-TO/Bacia do Córrego São João, perante quatro fatores de estresse: i) pressão sobre as condições ambientais; ii) demanda por água; iii) carga poluidora; e iv) eventos hidrológicos extremos (seca e inundação). Os resultados apontam que o maior estressor de risco à segurança hídrica do abastecimento de Porto Nacional se relaciona à demanda por água, pois a disponibilidade hídrica se encontra no seu limite e o uso da água a montante da captação da ETA continua a crescer. Por outro lado, constatou-se que as condições ambientais da Bacia têm sido progressivamente pressionadas, sobretudo pela agricultura e pastagens, além da notória expansão urbana. A qualidade de água e as secas/estiagens agravam esse quadro. Por fim, o principal resultado aponta para uma aparente compatibilidade entre a disponibilidade qualiquantitativa da água bruta do Córrego São João e os subsistemas de captação e tratamento da ETA 02, atualmente. Contudo, avaliou-se também que a Bacia se encontra próxima ao limite crítico, enquanto manancial de abastecimento de Porto Nacional.The São João stream is the strategic source for supplying the municipal headquarters of Porto Nacional. This dissertation aimed to identify the main risks and vulnerabilities to the public supply of Porto Nacional / TO, associated to the quantity and quality of raw water of the Córrego São João basin, and to analyze the level of current and future water security of the municipality. We adopted the model developed by members of the Research Group "Water, Water Management and Safety in times of Global Environmental Change".Thus, it was possible to develop a methodology of analysis of water security of urban supplies, specific to the São João Stream basin in Porto Nacional / TO, considering four stress factors considered as the most determinant for current vulnerability: i) pressure On environmental conditions; Ii) demand for water; (Iii) pollutant load and (iv) extreme hydrological events. The results showed that the greatest stressor to the water security of the supply of Porto Nacional, related to the problems of quantity and quality of raw water, is the demand for water. On the other hand, the pressure on the environmental conditions of the Basin was evidenced by the preparation and analysis of maps of land use and occupation in 2006, 2011 and 2016; The evolution (in time and space) of the anthropic occupation with implantation of temporary crops and of pastures, besides the notorious urban expansion, was verified. We did not identify any records of total paralysis of ETA 02. The main result shows that, currently, there is still compatibility between the quali-quantitative availability of the raw water of the São João Stream and the subsystems of capture and treatment of ETA 02.
25
Bauer, Melanie. "Enhanced reservoir operation strategies for securing the water supply in water deficient regions /." Hannover : Inst. für Siedlungswasserwirtschaft und Abfalltechnik, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015033167&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full text
26
Makame, Makame Omar. "Vulnerability and adaptation of Zanzibar east coast communities to climate variability and change and other interacting stressors." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1011895.
Full textAbstract:
Climate variability and change as well as sea level rise poses significant challenges to livelihoods, water and food security in small island developing states (SIDSs) including the Zanzibar Islands. Thus, without planned strategic adaptation, the future projected changes in climate and sea level will intensify the vulnerability of these sensitive areas. This thesis is based on research conducted in two sites located in the north eastern parts of each island, namely Kiuyu Mbuyuni, Pemba Island and Matemwe, Unguja Island. The research focused firstly on assessing the vulnerability of these two coastal communities to climate variability and change and other stressors. This included investigation of (1) the perceptions of fishers, farmers and seaweed farmers regarding climate stressors and shocks and associated risks and impacts, (2) existing and possible future water and food security issues, and (3) household's access to important livelihood assets. This was followed by an exploration of the coping and adaptive responses of farmers, fishers and seaweed farmers to perceived shocks and stresses and some of the barriers to these responses. Lastly, an analysis of the implications of the findings for achieving sustainable coastal livelihoods and a resilient coastal community was undertaken. The general picture that emerges is that local people along the east coasts of both islands are already vulnerable to a wide range of stressors. Although variability in rainfall is not a new phenomenon in these areas, increasing frequency of dry spells and coastal floods resulting from the influence of El Niño and La Niña events exert enormous pressures on local activities (fishing, farming and seaweed farming) which are the crux of the local economy. The main argument of the study is that the nature and characteristics of these activities are the main source of sensitivity amongst these communities and this creates high levels of vulnerability to climate shocks and trends. This vulnerability is evidenced by the reoccurrence of localised food shortages and the observed food and water insecurity. The study found that food insecurity is a result of unreliable rainfall, drought and seasonality changes. These interacted with other contextual factors such as poor soil, low purchasing power and the lack of livelihood diversification options. In addition to exposure to these almost unavoidable risks from climate variability, the vulnerability of the local communities along the east coasts is also influenced by the low level of capital stocks and limited access to the assets that are important for coping and adaptation. Despite this, some households managed to overcome barriers and adapt in various ways both within the three main livelihood sectors (fishing, farming and seaweed farming) as well as through adopting options outside these sectors resulting in diversification of the livelihood portfolio. However, the study found that most of the strategies opted for by fishers, farmers and seaweed farmers were mainly spontaneous. Few planned adaptation measures supported by state authorities were observed across the sites, with the exception of the provision of motorised boats which were specifically meant to increase physical assets amongst fishers, reduce pressure in the marine conservation areas and prevent overfishing in-shore. Furthermore, numerous strategies that people adopted were discontinued when further barriers were encountered. Interestingly, some of the barriers that prevented households adapting were the same ones that forced households that had responded to abandon their adaptations. To increase resilience amongst east coast communities to current and future predicted changes in climate and sea level, the study argues that traditional livelihood activities (fishing, farming and seaweed farming) need to be better supported, and access to a range of livelihood assets improved. This may be achieved through increased access to local sources of water and facilitation of rainwater harvesting, expanding the livelihood options available to people and increasing climate change awareness, and access to sources of credit.
27
Parrish, Douglas K. "Application of solid phase microextraction with gas chromatography-mass spectrometry as a rapid, reliable, and safe method for field sampling and analysis of chemical warfare agent precursors /." Download the dissertation in PDF, 2005. http://www.lrc.usuhs.mil/dissertations/pdf/Parrish2005.pdf.
Full text
28
Paton, Fiona Laura. "Frameworks for assessing and improving urban water supply security planning under climate change." Thesis, 2014. http://hdl.handle.net/2440/99033.
Full textAbstract:
There exist large uncertainties in projecting future climate and understanding how climate change projections relate to water supply. Non-traditional water sources (e.g., stormwater harvesting), which are emerging as adaptation options to augment stressed water supply systems, further complicate the simulation of these systems. However, in assessing a city’s water supply security, there is no framework explicitly acknowledging and accounting for both the additional complexities and uncertainties associated with non-traditional water sources and climate change impacts. Furthermore, mitigation and adaptation measures to climate change should be considered. However, minimising GHG emissions (and thus considering mitigation) is likely to conflict with other objectives of water supply system planning. Hence, a multi-objective evolutionary algorithm (MOEA) approach is necessary to balance multiple objectives, as well as to efficiently search many feasible alternatives to find Pareto-optimal solutions. However, for cities, MOEA studies incorporating GHG emissions and thus focussing on both mitigating and adapting to climate change do not exist. The main aim of this thesis is to develop methods for assessing and improving urban water supply security planning under climate change to better understand: (1) the relative magnitudes of uncertainty sources in assessing climate change impacts; (2) enhanced simulation complexity of non-traditional water sources and increased uncertainty of climate change impacts; and (3) adaptation and mitigation responses to climate change. Consequently, major contributions of this research include: (1) developing a scenario-based sensitivity analysis to understand the relative magnitudes of uncertainty sources in assessing the impacts of climate change on water supply systems; (2) developing a generalised framework for a city's water supply system that outlines the additional complexities due to the incorporation of non-traditional water sources and the additional uncertainties due to climate change impacts; and (3) incorporating GHG emissions as an objective function within a MOEA framework to take into consideration both adaptation and mitigation responses to climate change. Furthermore, while these frameworks could readily be applied to any city, Adelaide’s southern water supply system is used as a real-life case study to illustrate the practical management implications. The methods developed in the thesis were found to be effective when applied to Adelaide’s southern water supply system. Results indicate that studies analysing the impact of climate change on water supply security should consider uncertainties other than those associated with climate change and hydrological modelling, as these could have as great, if not greater, impacts on water supply security projections. Furthermore, trade-offs exist between cost and supply security for solutions that use desalination and harvested stormwater to augment water supply; however, use of rainwater tanks is undesirable, as they are an expensive source. In terms of the trade-off between economic cost and GHG emissions, the main drivers are the presence of rainwater tanks and the desalination plant – rainwater tanks are an expensive option, while desalination is a GHG emission intensive option. Consequently, while desalination may be a good adaptation option, other water sources may be better mitigation measures. Accounting for GHG emissions is thus important to ensure mitigation measures are considered.Thesis (Ph.D.) -- University of Adelaide, School of Civil, Environmental and Mining Engineering, 2014
29
Dotse, Laura Novienyo Abla. "Exploring the relationship between water scarcity on food and nutritional security in rural households in the Nqgeleni location, Eastern Cape." Thesis, 2016. http://hdl.handle.net/10539/21715.
Full textAbstract:
A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of requirements for the degree of Master of Science. Johannesburg, 2016.After several years of political and economic successes made since 1994, South Africa continues to experience major challenges in water availability, increased poverty, high levels of unemployment and more recently, steep increases in food and fuel prices. The Eastern Cape Province of South Africa is one of the regions that have been negatively affected by changes in climate variability, thereby, increasing the vulnerability and subjecting a significant number of households to increased poverty; water scarcity and food insecurity. The situation continues and there is a need to address this. This study sought to understand how the local households in the Eastern Cape Province in Nqgeleni location adapt to the extreme drought which impacts on their livelihood by exploring the different adaptive measures or systems that are implemented to cope with the climatic conditions in uplifting and providing food and nutrition security for sustainable growth and development. The primary aim of this research was thus to investigate how water scarcity influences food and nutritional security on rural household in Nqgeleni location. To achieve this aim, three secondary objectives were formulated. Firstly, to establish the relationship between water scarcity on food and nutritional security of rural households in Nqgeleni location. Secondly, to identify the drivers of water scarcity in the area. Lastly, to create an inventory of coping mechanism employed by rural households with water scarcity, food and nutritional security. An extensive literature review was undertaken to integrate prior findings and theories on water scarcity, food and nutritional security. The literature study revealed that water scarcity has a significant impact on food security. In addition, several factors such as demographic profile variables (population growth) and structural inefficiencies (infrastructure and management) were identified as potential drivers of water scarcity. In order to address the objectives set for this study, a number of items were sourced from the literature and a structured questionnaire administered to respondents who were selected by means of a simple random sampling technique. Data was collected from 111 usable questionnaires. The mixed method approach was employed as a core research methodology. The responses obtained were subjected to statistical analyses. Cronbach-alpha coefficients were calculated to confirm the internal consistency of the measuring instrument. The findings from this study are thus as follows. There was a significant relationship between water scarcity, food and nutritional security. Food security also has an impact on nutritional security. In addition, the drivers of water scarcity found in this study includes population growth, lack of infrastructure and poor management of water related issues by the municipality; all of which confirm findings in other studies. Furthermore, a number of respondents profile variables were identified as contributing factors to poverty, vulnerability, water scarcity, food and nutritional security in the Nqgeleni location. This includes lack of education, size of the household, and income level of the household. Based on the above findings, an inventory of coping mechanism was recommended to assist the rural households deal with water scarcity, food and nutritional security. This study has added to the empirical body of water scarcity, food and nutritional security in South Africa and the world at large. KEYWORDS: Water scarcity; Food security; Nutritional security; Eastern Cape; Nqgeleni location; South Africa
LG2017
30
Manandhar, Kebina. "Enhanching Security in the Future Cyber Physical Systems." 2015. http://scholarworks.gsu.edu/cs_diss/96.
Full textAbstract:
Cyber Physical System (CPS) is a system where cyber and physical components work in a complex co-ordination to provide better performance. By exploiting the communication infrastructure among the sensors, actuators, and control systems, attackers may compromise the security of a CPS. In this dissertation, security measures for different types of attacks/ faults in two CPSs, water supply system (WSS) and smart grid system, are presented. In this context, I also present my study on energy management in Smart Grid. The techniques for detecting attacks/faults in both WSS and Smart grid system adopt Kalman Filter (KF) and χ2 detector. The χ2 -detector can detect myriad of system fault- s/attacks such as Denial of Service (DoS) attack, short term and long term random attacks. However, the study shows that the χ2 -detector is unable to detect the intelligent False Data Injection attack (FDI). To overcome this limitation, I present a Euclidean detector for smart grid which can effectively detect such injection attacks. Along with detecting attack/faults I also present the isolation of the attacked/faulty nodes for smart grid. For isolation the Gen- eralized Observer Scheme (GOS) implementing Kalman Filter is used. As GOS is effective in isolating attacks/faults on a single sensor, it is unable to isolate simultaneous attacks/faults on multiple sensors. To address this issue, an Iterative Observer Scheme (IOS) is presented which is able to detect attack on multiple sensors. Since network is an integral part of the future CPSs, I also present a scheme for pre- serving privacy in the future Internet architecture, namely MobilityFirst architecture. The proposed scheme, called Anonymity in MobilityFirst (AMF), utilizes the three-tiered ap- proach to effectively exploit the inherent properties of MF Network such as Globally Unique Flat Identifier (GUID) and Global Name Resolution Service (GNRS) to provide anonymity to the users. While employing new proposed schemes in exchanging of keys between different tiers of routers to alleviate trust issues, the proposed scheme uses multiple routers in each tier to avoid collaboration amongst the routers in the three tiers to expose the end users.
31
Mmbadi, Elelwani. "Water security in rural Limpopo in a changing climate: A study of the Greater-Giyani Local Municipality, South Africa." Diss., 2019. http://hdl.handle.net/11602/1492.
Full textAbstract:
MENVSCDepartment of Geography and Geo-Information Sciences
Many rural communities of South Africa are living without adequate water supplies mainly due to historical lack of infrastructure and effective water reticulation systems. Day to day challenges of accessing water from distant boreholes and rivers are a reality particularly for women and children in rural Limpopo. This study investigates the nature and extent of water supply problems and how communities are living without adequate water in three rural communities of Greater-Giyani Local Municipality in South Africa. The study area lies in a semi-arid region which regularly experiences climate extremes such as droughts and floods which can reduce the ability of the municipality to supply water. Primary data was collected through questionnaires, key informant interviews and field observations while population, climate and hydrological data are also analyzed. A mixed methods research design was employed using qualitative methods such as content analysis whilst quantitative methods were dominated by time series analysis techniques and online interactive climate platforms such as the Climate Engine. It was found that households, schools and clinics in the study area rely mainly on boreholes for water supply but sometimes rivers supply those living nearby. An incomplete and poor water reticulation system coupled with erratic and shortening summer rainfall seasons are some of the major causes of water shortages in the study area. In order to cope with inadequate water, community members and public institutions in the study area have drilled boreholes and the sustainability of groundwater in the area is not well established. During summer, most households and institutions practise rainwater harvesting while a few resort to purchasing water from vendors. Despite these challenges which are not well documented, it was concluded that most of the rural poor households and institutions in the study area are well adapted to cope with water scarcity in the short term, while being vulnerable in the long term due to population growth and climate change. The study recommends the need for government and municipalities to invest in water reticulation systems in the long term whilst providing water to affected rural communities through water tankers, drilling more boreholes and maintenance of existing ones. Lessons learnt from this study may be useful to other municipalities across South Africa that are grappling with challenges of water access and supply.
NRF
32
Jeram, Dyani. "Thirsty for change: water challenges and opportunities in South African businesses." Thesis, 2019. https://hdl.handle.net/10539/29476.
Full textAbstract:
A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science, 2019Water is a key element linked to challenges such as food security, economic development, energy generation and climate change. South Africa experienced its driest year on record in 2015, together with one of the largest cities, Cape Town, almost running out of water in 2018. The likelihood of increased drought in the future coupled to climate risks makes it imperative to attend to water security concerns within the country. The business sector needs to pay more attention to water issues given its reliance on water for operation. This study explores how South African companies that are dependent on water respond to water security concerns linked to increased demand and variability. Focusing on the potential of the CDP Water reporting process to promote improved water stewardship practices. A mixed methods approach is used including a detailed investigation of CDP Water report data and interviews. Companies are unique in their responses, their perception of water risk hence determines their responses to the risk. Many companies showed misalignments between their company strategy, governance and practice in water decision making that further calls into question their water stewardship in addressing water security concerns. Although water stewardship is highlighted as an opportunity for various companies, engagement in practices that promote stewardship is low. In the pursuit of water stewardship practices and improved water management, context becomes key. By companies conducting comprehensive river basin assessments, it assists in addressing and engaging water risks in a local context. Beyond CDP reports and interviews, an underlying outcome has emerged that calls for effective sustainability/ environmental strategic planning in environmental departments within companies. Communication becomes an essential tool even though creating a business case around risk is not unique to water. An emphasis is then needed at Board level on effective leadership within a company to transform the way they view their water related risks and turn them into opportunities. To bring these findings together, archetypes were created based on company ‘water stewardship readiness.’ The archetypes encompassed the likelihood of companies engaging in water stewardship practices as this is seen as one of the best ways forward for business to assist in securing water in the country. The notion of a water champion to tackle water related risks and lead opportunities brings to light the value of education and creating individuals, regardless of their field of interest, with the understanding and knowledge that resources such as water are limited. Environmental issues should be embedded within these individuals for appropriate decision making given the current state and future projections of not only water, but environmental concerns going forward.
TL (2020)
33
Ojo, Tinuade Adekunbi. "Water access challenges and coping strategies in informal settlements : the case Ofiscor settlement in Pretoria West." Diss., 2018. http://hdl.handle.net/10500/24960.
Full textAbstract:
Discourses on challenges regarding water access in South Africa municipalities are intertwined with the concept of human rights and sustainable development goals. Stakeholders and social scientists continue to debate the plaque of service delivery in regard to water access in the African continent. These debates are framed around discussions to explore suitable governance models that are proficient to promote, protect and rule the right to water access amongst the poor. If South Africa and global curve continue to ignore the pleas of the disadvantaged communities on lack of water access, water scarcity will increase causing droughts and floods. The study investigated the water access, challenges and coping strategies in informal settlements specifically focusing on Iscor informal settlement. The challenges of access to water and coping strategies in informal settlements is a continuous issue of concern in South Africa Municipalities.
The study was premised on qualitative approach and employed both the snowball sampling and purposive sampling techniques which refer to key participants in the study area, the government officials and the key individuals interviewed for the research. Data were gathered from a total of 61 participants; interviews were conducted with 20 participants in the study area, 10male focus group and 10 female focus group participants, three key individuals from the study area, three government officials from Department of Water and Sanitation (National and Provincial office), five officials from the City of Tshwane metropolitan Municipality and lastly 10 residents on the impact of research, since the collaboration of the research resulted in the provision of basic amenities to the study area during the course of the research. The study analyses the findings of the stated case studies, with each narrative capturing the themes on Demography; Historical background of the study area; level and impact of water access and coping strategies. The findings from the study reflected the complex range of factors influencing and exacerbating the household resilience to water inaccessibility. The research recommends that the government should implement monitoring programmes and projects which will ensure water accessibility in all informal settlements across the city, provide shelters/RDP houses to the residents, educate and create jobs through support groups and NGOs to the study area.Development Studies
M.A. Development Studies
34
Gernandt, Leon. "The protection of water during armed conflict." Diss., 2000. http://hdl.handle.net/10500/16843.
Full textAbstract:
Water has been used for military purposes in the past and still continues today, i.e. poisoning of enemy water, attacking enemy water installations, etc. This conduct denies access to water, affects the supply of water, health, supply of electricity, etc. Public international law, such as treaties (e.g. The 1949 Geneva Conventions), customary international law, etc, regulate the protection of water during armed conflict.
Chapter I of the dissertation analizes the public international law ire the abovementioned. The application of public inteniational law, depends on the municipal law of the state concerned. This municipal law is, in the case of South Africa, found in the 1996 Constitution. The 1996 Constitution contains specific provisions regarding inter alia the legal obligations of the South African security services, the legal status of international agreements, as well as the application of customary international law and international law. Chapter II of the dissertation analizes the abovementioned wrt the legal obligations of the SA National Defence Force ire the subject matter.Constitutional, International & Indigenous Law
LL.M. (Public International Law)
35
(6564809), Elisabeth Krueger. "Dynamics of Coupled Natural-Human-Engineered Systems: An Urban Water Perspective on the Sustainable Management of Security and Resilience." Thesis, 2019.
Find full textAbstract:
The security, resilience and sustainability of water supply in urban areas are of major concern in cities around the world. Their dynamics and long-term trajectories result from external change processes, as well as adaptive and maladaptive management practices aiming to secure urban livelihoods. This dissertation examines the dynamics of urban water systems from a social-ecological-technical systems perspective, in which infrastructure and institutions mediate the human-water-ecosystem relationship.
The three concepts of security, resilience and sustainability are often used interchangeably, making the achievement of goals addressing such challenges somewhat elusive. This becomes evident in the international policy arena, with the UN Sustainable Development Goals being the most prominent example, in which aspirations for achieving the different goals for different sectors lead to conflicting objectives. Similarly, the scientific literature remains inconclusive on characterizations and quantifiable metrics. These and other urban water challenges facing the global urban community are discussed, and research questions and objectives are introduced in Section 1.
In Section 2, I suggest distinct definitions of urban water security, resilience and sustainability: Security refers to the state of system functioning regarding water services; resilience refers to ability to absorb shocks, to adapt and transform, and therefore describes the dynamic, short- to medium-term system behavior in response to shocks and disturbances; sustainability aims to balance the needs in terms of ecology and society (humans and the economic systems they build) of today without compromising the ability to meet the needs of future generations. Therefore, sustainability refers to current and long-term impacts on nature and society of maintaining system functions, and therefore affects system trajectories. I suggest that sustainability should include not only local effects, but consider impacts across scales and sectors. I propose methods for the quantification of urban water security, resilience and sustainability, an approach for modeling dynamic water system behavior, as well as an integrated framework combining the three dimensions for a holistic assessment of urban water supply systems. The framework integrates natural, human and engineered system components (“Capital Portfolio Approach”) and is applied to a range of case study cities selected from a broad range of hydro-climatic and socio-economic regions on four continents. Data on urban water infrastructure and services were collected from utilities in two cities (Amman, Jordan; Ulaanbaatar, Mongolia), key stakeholder interviews and a household survey conducted in Amman. Publicly available, empirical utility data and globally accessible datasets were used to support these and additional case studies.
The data show that community adaptation significantly contributes to urban water security and resilience, but the ability to adapt is highly heterogeneous across and within cities, leading to large inequality of water security. In cities with high levels of water security and resilience, adaptive capacity remains latent (inactive), while water-insecure cities rely on community adaptation for the self-provision of services. The framework is applied for assessing individual urban water systems, as well as for cross-city comparison for different types of cities. Results show that cities fall along a continuous gradient, ranging from water insecure and non-resilient cities with inadequate service provision prone to failure in response to extant shock regimes, to water secure and resilient systems with high levels of services and immediate recovery after shocks. Although limited by diverse constraints, the analyses show that urban water security and resilience tend to co-evolve, whereas sustainability, which considers local and global sustainable management, shows highly variable results across cities. I propose that the management of urban water systems should maintain a balance of security, resilience and sustainability.
The focus in Section 3 is on intra-city patterns and mechanisms, which contribute to urban water security, resilience and sustainability. In spite of engineering design and planning, and against common expectations, intra-city patterns emerge from self-organizing processes similar to those found in nature. These are related to growth processes following the principle of preferential attachment and functional efficiency considerations, which lead to Pareto power-law probability distributions characteristic of scale-free-like structures. Results presented here show that such structures are also present in urban water distribution and sanitary sewer networks, and how deviation from such specific patterns can result in vulnerability towards cascading failures. In addition, unbounded growth, unmanaged demand and unregulated water markets can lead to large inequality, which increases failure vulnerability.
The introduction of infrastructure and institutions for providing urban water services intercedes and mediates the human-water relationship. Complexity of infrastructural and institutional setups, growth patterns, management strategies and practices result in different levels of disconnects between citizens and the ecosystems providing freshwater resources. “Invisibility” of services to citizens results from maximized water system performance. It can lead to a lack of awareness about the effort and underlying infrastructure and institutions that operate for delivering services. Data for the seven cities illustrate different portfolios of complexity, invisibility and disconnection. Empirical data gathered in a household survey and key stakeholder interviews in Amman reveals that a misalignment of stakeholder perceptions resulting from the lack of information flow between citizens and urban managers can be misguiding and can constrain the decision-making space. Unsustainable practices are fostered by invisibility and disconnection and exacerbate the threats to urban water security and resilience. Such challenges are investigated in the context of urban water system traps: the poverty and the rigidity trap. Results indicate that urban water poverty is associated with local unsustainability, while rigidity traps combined with urban demand growth gravitate towards global unsustainability.
Returning to the city-level in Section 4, I investigate urban water system evolution. The question how the trajectories of urban water security, resilience and sustainability can be managed is examined using insights from hydrological and social-ecological systems research. I propose an “Urban Budyko Landscape”, which compares urban water supply systems to hydrological catchments and highlights the different roles of supply- and demand-management of water and water-related urban services. A global assessment of 38 cities around the world puts the seven case studies in perspective, emphasizing the relevance of the proposed framework and the representative, archetypal character of the selected case studies.
Furthermore, I examine how managing for the different dimensions of the CPA (capital availability, robustness, risk and sustainable management) determines the trajectories of urban water systems. This is done by integrating the CPA with the components of social-ecological system resilience, which explain how control of the different components determines the movement of systems through states of security and resilience in a stability landscape. Finally, potential feedbacks resulting from the global environment are investigated with respect to the role that globally sustainable local and regional water management can play in determining the trajectories of urban water systems. These assessments demonstrate how the impact of supply-oriented strategies reach beyond local, regional and into global boundaries for meeting a growing urban demand, and come at the cost of global sustainability and communities elsewhere.
Despite stark differences between individual cities and large heterogeneities within cities, convergent trends and patterns emerge across systems and are revealed through application of the proposed concepts and frameworks. The implications of these findings are discussed in Section 5, and are summarized here as follows:
1) The management of urban water systems needs to move beyond the security and resilience paradigms, which focus on current system functioning and short-term behavior. Sustaining a growing global, urban population will require addressing the long-term, cross-scale and inter-sector impacts of achieving and maintaining urban water security and resilience.
2) Emergent spatial patterns are driven by optimization for the objective functions. Avoiding traps, cascading failure, extreme inequality and maintaining global urban livability requires a balance of supply- and demand-management, consideration of system complexity, size and reach (i.e., footprint), as well as internal structures and management strategies (connectedness and modularity).
3) Urban water security and resilience are threatened by long-term decline, which necessitates the transformation to urban sustainability. The key to sustainability lies in experimentation, modularization and the incorporation of interdependencies across scales, systems and sectors.
36
Cerqueira, Paula Alexandra Lopes. "Estruturação inicial e elaboração de documentação base do Plano de Segurança da Água da CMCB." Master's thesis, 2015. http://hdl.handle.net/1822/47587.
Full textAbstract:
Dissertação de mestrado integrado em Engenharia Biológica (área de especialização em Tecnologia do Ambiente)Na atualidade, as questões relacionadas com a qualidade da água são cada vez mais uma realidade. Do mesmo modo, existem cada vez mais preocupações relacionadas com o seu impacto na saúde pública. De facto, a junção da escassez deste elemento tão importante para a vida, e a possibilidade de veiculação de doenças transmitidas pelo meio hídrico fazem com que haja, neste momento uma grande preocupação a nível mundial relacionada com estas questões, quer seja o uso que se lhe dá, a quantidade disponível e, a qualidade que esta apresenta. Assim, existe uma forte recomendação por parte da Organização Mundial da Saúde, para a implementação de novas metodologias e políticas neste âmbito. Também a entidade reguladora responsável pelo sector de águas em Portugal, apela de forma ativa à introdução de novas metodologias por parte das Entidades Gestoras, e deste modo garantir que se está no caminho certo e que a água aqui produzida é efetivamente de qualidade e que satisfaz de forma contínua os requisitos dos consumidores. Neste contexto, as duas entidades anteriormente mencionadas, alertam, a nível nacional, as Entidades Gestoras responsáveis pelo abastecimento de água, para a introdução de novas metodologias que tenham por base uma abordagem preventiva, e que assim analisem o sistema, etapa a etapa desde a origem da água até ao consumidor final, antecipando todos os riscos a que o mesmo se encontra sujeito. A metodologia de Plano de Segurança da Água, assenta nos princípios anteriormente mencionados. O presente trabalho apresenta uma descrição das várias etapas do desenvolvimento do Plano de Segurança da Água da Zona de Abastecimento de S. Nicolau, a cargo da Câmara Municipal de Cabeceiras de Basto. Este plano foi realizado com base numa abordagem de identificação e avaliação de possíveis riscos a que o sistema poderá estar sujeito. Assim conseguiu identificar-se um conjunto de Pontos Críticos de Controlo, estabelecer Planos de Monitorização Operacional com as instruções necessárias ao correto funcionamento do sistema e um conjunto de ações corretivas a adotar para um melhor funcionamento do sistema.
Currently, the matters relating to water quality are increasingly becoming a reality. Likewise, there is growing concerns regarding their impact on public health. In fact, the junction of the shortage of this element so important for life, and the possibility of binding diseases transmitted by the water environment contributed to the existence at the moment of a major concern worldwide related to these issues, whether it is its use, its available quantity or the its quality. Thus, there is a strong recommendation by the World Health Organization, to implement new methodologies and policies in this area. Also the regulatory body responsible for the water sector in Portugal, calls actively for the introduction of new methodologies by the Management Entities, and thus ensuring that they are on track and that the water here produced is actually of quality and that it continuously satisfies the consumer requirements. In this context, the two aforementioned entities, alert, at national level, the Managing Authorities responsible for the water supply to the introduction of new methodologies which are based on a precautionary approach and thus analyze the system, step by step from the water source to the final consumer, anticipating all the risks to which it is exposed. This methodology is based on the principles of the Water Safety Plan. The present work presents a description of the various stages of the development of the Water Safety Plan of the Supply Area of S. Nicolau, responsability of the Municipality of Cabeceiras de Basto. This plan was developed based on an approach of identification and evaluation of possible risks to which the system may be exposed. Thereby it was possible to identify a set of critical control points, to establish Operational Monitoring Plans with the needed guidelines for the correct operation of the system and a set of corrective actions to be adopted to improve the functioning of the system.
37
Khumalo, Sihlanganiso. "Water crisis in cities : an investigation into the contribution of water demand management towards mitigating the scarcity of potable water in the city of Bulawayo." Diss., 2013. http://hdl.handle.net/10500/13785.
Full textAbstract:
The study investigates the contribution of WDM towards mitigating scarcity of potable water in cities with particular reference to Bulawayo.WDM origins and its successes are traced. The study classifies scarcity representations into four categories and reveals that the scarcity in Bulawayo satisfies all the four representations hence calls it total scarcity. The research employed document study, questionnaires, interviews and a focus group to collect data. Document study revealed that water restrictions successfully mitigate the scarcity in Bulawayo. Field work partially confirmed the usefulness of WDM in the life of the city and revealed the need to synchronize the conceptualizations of WDM among different stakeholders in order for the paradigm to do even more in terms of mitigating scarcity. The results were interpreted in terms of TPB. The key recommendation of the study is that the city invests in water use behaviour change in order to realise huge water savings.Development Studies
M.A. (Development Studies)
38
Leech, Michael Graham. "Strategy for viable, sustainable urban agriculture in a dynamic, urbanising society." Thesis, 2014. http://hdl.handle.net/10500/14219.
Full textAbstract:
At Constitutional level, legislation in South Africa entrenches the provision of food and water for all its citizens. In instances where citizens are unable to provide in these basic requirements for themselves, social assistance should be provided to ensure a healthy life for all. In this regard, legislation and Town Planning ordinances and regulations are in place to ensure that built-up environments in which we live and work are healthy and safe for all. However, this study revealed that food provisioning by community gardeners is peripheral in legislation, ordinances and regulations and the practice of urban agriculture is, in many instances, in conflict with the principle of safe and healthy food for all.
Community gardeners/urban agriculturists are food farmers within the city who produce food for themselves and others without the checks and balances that are otherwise applicable to food brought into the city from outside. While food production on any piece of available land is vital for these community gardeners for their sustenance and survival, it could become a potential health hazard if no checks or testing measures are in place to ensure that the food being produced is safe for human consumption.
The study sought the views and perceptions of community gardeners, residents, Environmental Health Practitioners and Town Planners in the eThekwini Metro region with regards to community gardening/urban agriculture and its impact on food provisioning to citizens. For data collection, a one-on-one interviewing survey method was used with all four groups and results were calculated and converted to average percentages and analysed.
The results revealed that there was conflict between legislation, ordinances and regulations regarding the production of food in the built-up environment of the EThekwini Municipality. It was also revealed that there was no cohesive policy to control the production of food produced and sold by community gardeners in the study area.
The need for control measures and regulations regarding food production and sale by community gardeners was highlighted. Moreover, where ineffective or none such measures or controls exist, a transparent and consultative process involving all stakeholders must take place in order to establish up viable and sustainable control
measures. The people who will be most affected by these rules, namely the community gardeners, should be pivotal role players in the establishment of a sustainable urban agriculture policy.
Recommendations to address the problems illuminated by the study are presented.Environmental Sciences
Ph.D. (Environmental Management)
39
Maponya, Phokele Isaac. "Asset portfolios and food accessibility in a village in Sekhukhune, Limpopo Province." Diss., 2008. http://hdl.handle.net/10500/795.
Full textAbstract:
This study aims at investigating household food accessibility categories (food insecure, vulnerable, marginal and food secure) of rural households in Sekhukhune district of Limpopo province. The study is based on five wards in Mamone village in the Limpopo province of South Africa. Ten households from each ward were randomly selected for the study. Structured questionnaires administered by enumerators were used to collect information from household heads. In all 50 household heads constitutes the sample size for the study. Data was collected from 20 August 2007 to 25 August 2007. Responses in the questionnaires were tabulated, coded and processed using Statistical Package for Social Sciences (SPSS) programme. Based on comprehensive food security and vulnerability analysis the study showed that over 70 per cent of the sampled households were food insecure. Lack of education, income sources, water source, and infrastructure were some of the important factors contributing to food insecurity. The government should also give special attention to policy measures that guide towards the provision of household assets. It is recommended that special attention be given to measures that will provide the necessary factors that negatively affect household food security and vulnerability.Agriculture, Animal Health and Human Ecology
M.A. (Human Ecology)