M.Ing. / Water demand prediction can be useful for future planning and has a significant economic effect on a city, town or suburb. There are numerous factors influencing water demand and therefore influencing the prediction thereof. The effect of each of these factors on the water demand is called the elasticity of that factor. The main aim of this study is to determine area and income elasticities of demand. This will enable the reader to predict water demand by taking stand size (area) and income into account. The stand value of each user was used as a surrogate for the income of that user. Another aim of this study is to compare average water demands for different cities and towns in Gauteng, South Africa with each other. Over 190 000 users' data were used for this study.

In two-dimensional flow, the point of flow separation from the surface coincides with the point at which the skin friction vanishes. However, in three-dimensional flow, the situation is much more complex and the flow separation is rarely associated with the vanishing of the wall shear stress except in a few special cases. Though the effects of cross-plane separation are substantial and have been recognized for some time, the phenomenon of flow separation over three-dimensional bodies is still far from being completely understood. The flow is so complex that no completely satisfactory analytical tools are available at the moment. In an attempt to logically identify the various effects and parametric dependence while simultaneously minimizing configuration dependent issue, the flow over a 6 to 1 prolate spheroid, which is a generic three-dimensional body, is investigated. For the identification of the general flow pattern and better understanding of the flow field, surface-oil-flow visualization tests and force and moment tests were performed. The angle of attack effect and Reynolds number effect on the separation location are studied with natural transition. Forces and moments tests, surface pressure distribution measurements as well as the surface pressure fluctuations, and mini-tuft flow visualization tests were made to document the flow characteristics on the surface of the body with an artificial boundary layer trip. / Ph. D.

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.

Water is essential for life, and access to sources of safe water and sanitation facilities is a first-order concern for economic welfare and general well-being. While the majority of residents in developing countries have access to improved water and sanitation services, many parts of the developing world lag significantly behind in this vital infrastructure. This dissertation studies policies aimed at increasing access, quality, and efficiency of improved water and sanitation (WS) services in developing countries. In the following three chapters, I focus on non-technological methods for improving service by eliminating the economic, political, and institutional barriers to safe water and sanitation provision. Chapter 1, “The Buck Stops Where? Federalism and Investment in the Brazilian Water and Sanitation Sector”, shows how weak institutions can undermine public goods service when multiple levels of government share responsibility of provision. In particular, I study how legal ambiguities regarding degrees of governmental authority can lead to systematic underinvestment in public utilities. I examine the Brazilian water and sanitation (WS) sector, which presents an natural experiment of shared provision between state and municipality entities. I look at a legal reform that clarified the relationship between municipalities and states in a quasi-experimental, difference-in-differences framework, using an administrative, municipality-level panel dataset from 2001-2012. I find that when expropriation risk by state companies diminished - self-run municipalities almost doubled their WS network investment. This increase in investment led to a significant increase in access to the WS system in these municipalities. The analysis provides strong evidence that reforms that strengthen residual control rights and eliminate the threat of intra-governmental expropriation can lead to large increases in public goods investment. Chapter 2, “The Role of Basic Sanitation Plans on Service Provision: Evidence from Brazil”, investigates non-technological methods of increasing access to improved water and sanitation (WS) in developing countries. In particular, it presents evidence of the efficiency gains that can be achieved in municipal water provision through the act of formulating and carrying out basic sanitation plans. I exploit the staggered roll-out in implementation of basic sanitation plans throughout municipalities in southern Brazil from 2007-2013. I find that, in the three years after the enactment of sanitation plans, municipalities increased the efficiency of their respective water systems through the tightening up of “leakages" in the system, both in terms of water distribution and bill payment. However, I find no significant increases in the degree of individual access to the systems, suggesting that in the relatively short-run, providers focus on improving the existing system as opposed to building out new infrastructure. Chapter 3, “(Not So) Gently Down The Stream: River Pollution and Health in Indonesia”, addresses the fact that waterborne diseases are the leading cause of mortality in developing countries. We emphasize a previously ignored cause of diarrhea - upstream river bathing. Using newly constructed data on upstream-downstream hydrological linkages along with village census panel data in Indonesia, we find that upstream river bathing can explain as many as 7.5% of all diarrheal deaths. Our results, which are net of avoidance behavior, show no effect of trash disposal on diarrheal infections. Furthermore we find that individuals engage in avoidance behavior in response to trash disposal (visible pollutants) but not river bathing (invisible pollutants). We conduct policy simulations to show that targeting upstream individuals could generate substantial environmental and health savings relative to targeting downstream individuals. This provides a potential road map for low- and middle-income countries with limited resources for enforcement of water pollution.

Thesis (Ph. D.)--University of California, San Diego, 2007. / Title from first page of PDF file (viewed June 21, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.

In recent years South Africa has experienced numerous service delivery protests. These protests are a result of the lack of delivery of basic services such as water and sanitation (amongst others). To address this, local governments have taken part in benchmarking initiatives (National Benchmarking Initiative, Municipal Benchmarking Initiative) and regulation programmes (BlueDrop,GreenDrop) in an effort to improve the quality of potable water and sanitation services. The latter of these focuses on the quality of the water services delivered and neither focus on the efficiency with which this delivery is achieved. This study uses both nonparametric (data envelopment analysis) aswell as parametric (stochastic frontier) methods to assess the efficiency of water service provision in South Africa over a six year period from 2005 to 2010. Subsequently, the method which is most suited for use in the South African context is proposed. In addition, this study demonstrates how these methods can be used to determine the effectiveness of benchmarking initiatives, namely the National Benchmarking Initiative, in improving the efficiency of water service provision. Furthermore, additional insight into the selection ofm in them out of n bootstrap procedure for efficiency evaluations is established through a simulation study. The inclusion of efficiency evaluations into South African benchmarking initiatives provides new and important insight into the standard of water service delivery. As such, the techniques used in this study illustrate how efficiency analysis can enhance benchmarking initiatives in South Africa.

A research report submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in partial fulfilment of the requirements for the degree of Master of Science in Engineering, 2016 / The Newcastle Local Municipality (NLM) has been experiencing water supply interruptions since 2010 due to high demand. Between June 2011 to December 2011, water losses ranged from 49% to 62% (about 23 to 30 megalitres per day) in Madadeni and Osizweni townships (Newcastle East). The suburban areas (i.e. Newcastle West) also experienced water interruptions due to collapsing and/or aging infrastructure. About a thousand households in Madadeni were involved in this study to find the cause of the high water losses. Awareness campaigns, repairing household leaks, installation of intelligent meters and the increase of free basic water in indigent households from 6kℓ to 12kℓ per month reduced water losses from about 246 kℓ to 177kℓ per month. If similar Water Conservation (WC) and Water Demand Management (WDM) could be rolled out to the 35 000 households in the NLM and similar results to those in Madadeni are attained, conservative water saving of about 21Mℓ per day could be achieved. This would reduce the demand on the Ngagane Water Treatment Works (WTW) by 20%. / CK2018

Thesis (Ph. D. (Administration Development Planning and Management)) -- University of LImpopo, 2017 / Whilst previous research has largely blamed inadequate finance as the cause of insufficient water provision and concomitant development implications such as poverty and food production; this thesis, took a slightly different turn and engaged on a critical deconstruction of the relationship between water infrastructure financing and water provision in South Africa. Archival data on South Africa between 1994 and 2014 were collected on water provision, water-asset finance, governance effectiveness, corruption, violence, accountancy and voice. Data were analysed using the OLS regression fixed effect. Findings from the analysis showed that against popular belief, there was lack of significant relationship between water asset finance and water provision. However, nonfinancial variables namely corruption, social violence, accountability and voice of citizens in development decisions showed a significant relationship with water provision. In addition, the analysis showed that water provision is significantly related to cereal production and incidence of poverty. Therefore, the thesis emphasized that rural development could be enhanced through an improved effort on water provision, which would increase cereal production and reduce the incidence of poverty. It stressed however, that provision of water asset finance without attention and control of nonfinancial variables might have the tendency to derail water provision initiatives in South Africa. The thesis made an original contribution by proposing a conceptual framework for employing and researching the catalyst for water provision in South Africa. It also developed three novel research models for future research. Key words: Infrastructure financing, water infrastructure, water provision, water and development, governance, accountability, poverty reduction

Thesis ( M.Dev.) -- University of Limpopo, 2018 / This study reflects on the effectiveness of municipal water service delivery in Hluvukani community in Bushbuckridge, Mpumalanga. Since the study wanted to have an in-depth understanding of the strategies/methods that the municipality use to deliver water services effectively in Hluvukani, both the qualitative and quantitative research approaches were used. It is within these methodologies that a case study was adopted to seek to deepen the strategies used by government and municipal officials to address the challenges of water experienced by villagers in Hluvukani. Three methods of data collection were used, namely: interviewing, non- participant observation and documents. Hluvukani village was selected as a site for the study by means of purposive sampling. The participants interviewed included the municipal manager, the municipal officials, Hluvukani villagers and officials from the Department of Water Affairs. The documents consulted included the municipal IDP and the 2015/2016 Municipal Budget. This study found that villagers have difficulties in accessing water at Hluvukani and the water service delivery was not effective even though the municipal manager claimed otherwise. This was manifested by the strategies that were used to delivery water such as using delivery trucks to supply water to Hluvukani villages every two weeks. This, the researcher found ineffective as people had to live without water delivery for a period up to four weeks.

This study examined the effects of drought on the City of San Bernardino Municipal Water Department’s (SBMWD’s) wastewater treatment plant (WWTP) wastewater flow rates and constituent concentrations. The study utilized data obtained from the SBMWD’s monthly discharge monitoring reports (DMRs), dating from 2007 to 2015. For each report the SBMWD Water Reclamation Plant (WRP) and Rapid Infiltration and Extraction (RIX) facility influent and effluent flow rates, along with concentrations of ammonia, biochemical oxygen demand (BOD), total suspended solids (TSS), total inorganic nitrogen (TIN), and total dissolved solids (TDS) were examined. Even though influent and effluent flow rates were examined for both WRP and RIX facilities, a majority of the flow-rate research concentrated on WRP influent flow rates because changes of influent flow rates cascade down the treatment process from WRP influent flow rates to RIX effluent flow rates. Impacts of the drought were analyzed by comparing drought statistics, for the Riverside-San Bernardino area, to influent flow rate trends and relevant constituent concentrations. Relevant constituent data were determined based on if they were discharged near their National Pollutant Discharge Elimination System (NPDES) permit limits. Pearson Correlation Analyses were used to assess any relationships between influent flow rates and relevant constituents. WRP influent flow rates and TIN concentrations were the only two parameters explored by this project that exhibited measurable changes related to the drought. WRP influent flow rates observed an inverse relationship with drought because persisting drought conditions led to decreased wastewater flow rates. TIN concentrations had a positive relationship with drought conditions based on the inverse correlation between influent flow rates, and the graphical relationship between drought conditions and TIN concentrations. The Pearson correlation coefficient for TIN concentrations and influent flow rates was -0.630 with a p-value less than 0.05, which is a strong negative relationship. Inconsistencies were observed during 2010 and 2011, which were non-drought periods. During non-drought periods it was expected that flow rates would be highest and constituent concentrations would be lowest. This was not the case because during 2010 and 2011 flow rates were lowest and TIN concentrations were highest, contradicting all other data. The drought-related justification for these abnormalities was that the implementation of the 20x2020 Water Conservation Plan, a California water management plan enacted in 2009, increased water conservation and reduced wastewater flow rates. However, there are many other factors that were not explored by this project that could have led to decreased wastewater flow rates, such as housing foreclosure rates peaking during 2010. Further studies are recommended.