The provision of sanitation services during the apartheid era in South Africa was minimal or non-existent in the previous "black" areas and for farm workers. Whatever service that was provided was often in a bad state of disrepair. One of the priorities established in the post 1994 elections was to improve the quality of lives for the previously marginalised and neglected communities. This was done through the development and implementation of a policy for reducing the sanitation backlog, and for the provision of a basic level of sanitation. The principles encompassed in the policies developed for poverty alleviation and sustainable development had many points in common with the United Nations Millennium Development Goals and targets declared in 2000. The provision of Ventilated Improved Pit (VIP) latrines by municipalities satisfies the minimum requirements for basic sanitation. This provision together with the awareness programs are seen to offer communities an improved environment and hence living conditions. Problems arise however, due to the rapid filling, blockages and even the overflow of these pits. The emptying of these pits is also hazardous due to the nature of the waste. One of the solutions proposed by entrepreneurs was to supply additives that would enhance the degradation processes in the pit thereby increasing the Iifespan of these pits as well as offering other benefits; reduced odours, and flies. The aim of this research work was to test the claim of enhanced degradation by determining the effectiveness of an additive, M, which was deemed to be representative of a group of additive; made up of aerobic microbes and enzymes. The objective was to supply information to the municipality planners and decision makers in municipalities to assist them in their planning for improved management of pits. Waste was removed from suitable VIPs and used as samples for laboratory scale experiments. Reactor vessels were designed to simulate pit conditions. The additive was tested on the waste as recommended by the supplier and compared in activity against waste tested as references. The reference tests had (i) no addition of additive or water, as well as (ii) varying the volume of water added and (iii) varying the frequency of water addition, no additive added. Measurements were made of the following variables: • Total mass • Chemical oxygen demand. • Total solids • Volatile solids. • Ash. The results of the experimental vessels were analysed and compared with the reference vessels to reveal any differences. The results obtained did not present enough precision and reliability to make any conclusive decision as to whether the additive is effective or not. Recommendations made were to improve the test methodology using the same additive, to obtain results that would make a conclusive decision possible. / Thesis (M.Sc.)-University of KwaZulu-Natal, Durban, 2008.

Risks are present in every aspect of business. As one of the biggest industries worldwide, the construction industry is plagued with risks. Being such a large industry, there are hundreds of contracts signed every day. These contracts range from new construction, refurbishment to maintenance. Some projects are simple and worth few thousands of dollars where others are complex and may cost hundreds of millions. Irrespective of how simple or complex the project is, all projects are exposed to risk and can go wrong (Edwards and Bowen, 2005). Construction is governed by complicated contracts and involves complex relationships in several tiers (Abdou, 1996). According to Sawczuk (1996) as soon as the employer and the contractor have signed a contract they have taken on board risks. Their awareness of the risk and the steps to be taken to manage their share of the risk, will determine the likelihood of problems occurring. Construction projects have an abundance of risk, contractors cope with it and owners pay for it. The construction industry is subject to more risk than any other industries. Taking a project from initial investment appraisal to completion and into use is a complex and time-consuming design and construction process. It requires a multitude of people with different skills and a great deal of effort to co-ordinate a wide ranges of disparate, yet interrelated, activities. Inevitably, this complex process is compounded by many unexpected events that may cause loss to the client and other involved parties (Shen, 1999; Flanagan and Norman, 1993). According to Carter et al. (1997) the construction industry is facing a more challenging environment than any time in the past. Client expectations have grown higher and they call for better quality and service. Smith (1998) highlighted that for years the South African building industry had a very poor reputation in managing construction risks. These risks could be prevented or reduced if management takes action at early stages ofthe project life cycle. In order to overcome these limitations and improve the image of the South African construction industry, this research aims to develop an innovative framework to enable construction contractors to identify, quantify and classify the risks associated with the Joint Building Contracts Committee (JBCC) Principal Building Agreement (PBA). This will help making decisions on informed bases. In addition, it will enable contractors develop particular course of actions to mitigate the effects ofthese risks. The research methodology designed to achieve this aim consisted of literature review, questionnaire and interview. Firstly, the literature review was used to review risk management in construction, construction contracts, Risks are present in every aspect of business. As one of the biggest industries worldwide, the construction industry is plagued with risks. Being such a large industry, there are hundreds of contracts signed every day. These contracts range from new construction, refurbishment to maintenance. Some projects are simple and worth few thousands of dollars where others are complex and may cost hundreds of millions. Irrespective of how simple or complex the project is, all projects are exposed to risk and can go wrong (Edwards and Bowen, 2005). Construction is governed by complicated contracts and involves complex relationships in several tiers (Abdou, 1996). According to Sawczuk (1996) as soon as the employer and the contractor have signed a contract they have taken on board risks. Their awareness of the risk and the steps to be taken to manage their share of the risk, will determine the likelihood of problems occurring. Construction projects have an abundance of risk, contractors cope with it and owners pay for it. The construction industry is subject to more risk than any other industries. Taking a project from initial investment appraisal to completion and into use is a complex and time-consuming design and construction process. It requires a multitude of people with different skills and a great deal of effort to co-ordinate a wide ranges of disparate, yet interrelated, activities. Inevitably, this complex process is compounded by many unexpected events that may cause loss to the client and other involved parties (Shen, 1999; Flanagan and Norman, 1993). According to Carter et al. (1997) the construction industry is facing a more challenging environment than any time in the past. Client expectations have grown higher and they call for better quality and service. Smith (1998) highlighted that for years the South African building industry had a very poor reputation in managing construction risks. These risks could be prevented or reduced if management takes action at early stages ofthe project life cycle. In order to overcome these limitations and improve the image of the South African construction industry, this research aims to develop an innovative framework to enable construction contractors to identify, quantify and classify the risks associated with the Joint Building Contracts Committee (JBCC) Principal Building Agreement (PBA). This will help making decisions on informed bases. In addition, it will enable contractors develop particular course of actions to mitigate the effects ofthese risks. The research methodology designed to achieve this aim consisted of literature review, questionnaire and interview. Firstly, the literature review was used to review risk management in construction, construction contracts, / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2008.

The eThekwini Municipality is facing two major challenges in controlling odorous emissions by various industries in the South Durban Basin; firstly, getting industry to manage their onsite odorous emissions and, secondly regulating these odorous emissions. This study focused on the Jacobs’s Industrial Complex (JIC) which comprises various industries releasing air emissions which impact on the local air quality. The impact of these emissions is supported by the number of odour complaints reported to the eThekwini Environmental Health Department by the public. Cleaner production (CP) is an integrated approach aimed at continuously reducing environmental impacts of processes, products and services through applying preventive approaches rather than controlling and managing pollution once it has been created. This dissertation has assessed the application of CP as a concept to prevent and reduce emissions of odours by industries in the JIC that are an impacting on the environment and neighbouring communities. Three CP case studies are analysed to demonstrate the applicability of the approach. These are a CP project for drum reprocessing company based in the South Durban Basin and two waste minimisation clubs which operated from 1998 to 2000 in Durban. The key findings, outcomes, experiences and lessons learnt from these case studies underpin the recommendation of an approach that can be applied by eThekwini Municipality to incorporate CP in the scheduled trade (ST) permitting of odour producing industries. This research has applied a multi-case study design implying both qualitative and quantitative approaches. A qualitative approach was used in the detailed analyses of case studies whilst the quantitative one was applied in the graphical analyses of the odour complaints statistics for the JIC. The study concludes by drawing two major recommendations from the lessons leant. Recommendation 1: The general CP strategy that can be applied by eThekwini Municipality in regulating, promoting, enforcing, monitoring and evaluating application of CP practices among stakeholders. The recommended objectives for the general strategy include: · Enforcement of uniform regulatory standards. · Development of a policy or guidelines. · Effective compliance monitoring and enforcement. · Develop a local Cleaner Production Centre (LCPC). · Ensure co-operative governance. · Provide adequate financial resources. · Monitoring and evaluation. Recommendation 2: Strategy for incorporating CP in the ST permitting of odour producing industries. It is recommended that the ST permit holder for an odour producing industry comply with the following: · Prioritisation of odour like the other priority pollutants. · Industry to perform an audit to map odour emitting areas. · Permit holder to development a CP based odour management plan. · Investigate possible CP projects that can be undertaken to prevent and mitigate odour emissions. · Incorporate an odour management plan into a 5 year environmental improvement plan. · Develop and appropriately manage an odour complaints management system. · Set odour management performance indicators and baselines for targets and reporting. · The permit holder should include odour management performance including odour complaints management in the annual report. / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2011.

Through the National Environmental Management Act (No. 107 of 1998), the South African Department of Environmental Affairs and Tourism (DEAT) introduced the concept of the Waste Hierarchy (Reduce - Reuse - Recover - Dispose) as the only possible road towards sustainable development. This concept of sustainable waste management was extended into the Polokwane Declaration on Waste Management which identified Zero Waste as the ultimate goal for sustainable waste management systems in South Africa. Zero Waste is defined as the concept of using all waste produced in a certain area for production activities in that area when it is environmentally acceptable, socially equitable and economically viable, with unavoidable residual waste going to landfill. The aim of this thesis is to test the applicability of Zero Waste to post-consumer waste arising from rural and urban areas. The primary reason that this study has been attempted is that little research in South Africa has focused on the demand-side management of post-consumer waste, and that whatever research that has been undertaken has focused almost exclusively on waste management in urban areas. In order to realise the aim of this thesis, two case studies were selected and analysed: one rural and one urban. These case studies were selected due to differences in characteristics of the waste arising from households, existing waste management systems and socio-economic indicators for households in these areas. In each case study, a proposed Zero Waste Scheme was assessed for application based on four sustainability criteria: environmental, social, economical and institutional. The Zero Waste Schemes are based on the conceptual Zero Waste Model (ZWM) that has been specifically developed as the main tool for conducting this research. The development and use of the ZWM in assessing waste management systems in South Africa is a significant contribution of this thesis to knowledge. Generally, the results showed that the proposed Zero Waste Schemes could meet three of the evaluation criteria used in the investigation, but could not meet the fourth: institutional sustainability. For this reason, the Zero Waste Schemes could not be implemented since the municipalities responsible for waste management in those areas did not have the capacity administrative, financial resources and political will - to implement them. Thus, institutional sustainability has been shown to be the main constraint in the application of Zero Waste Schemes in post-consumer waste management systems in South Africa. This is another significant contribution of this thesis to knowledge.Other significant findings from this study reveal that rural areas lack basic waste collection and disposal systems; hence this lack in service delivery prevents full implementation of Zero Waste Schemes in these areas. In contrast, households in urban areas are served by integrated waste management systems that extend to most households, and most of these households are able to finance the waste management services provided. The existence of the integrated waste management systems was used as a basis for introducing waste minimisation and at-source separation of recyclables in order to reduce the amount of waste needing disposal. Education of households in urban areas has been identified as a key factor in establishing Zero Waste Schemes in the case study areas. In conclusion, it has been shown in this thesis that although Zero Waste Schemes are theoretically applicable to rural and urban areas of South Africa, institutional constraints that will have to be overcome in order to make Zero Waste a reality. Implicit in this conclusion is the extension of waste collection services to rural households and the full participation of rural and urban households in Zero Waste Schemes, participation which can only be verified by actual implementation of the schemes. This is the next step in the approach towards Zero Waste within post-consumer waste management in South Africa. / Thesis (Ph.D.)-University of KwaZulu-Natal, Durban, 2009.

The purpose of this study was to develop a rainfall model, continuous in space-time, which captures both the spatial and temporal structure of rainfall over a range of scales varying from lkm to 128km pixels at temporal resolutions ranging from 5 minute up to 1 year. Such a model could find application in a variety of hydrological fields including the management of flash flood scenarios where it could be used in combination with runoff models as a training tool in the operation of flood control structures, the assessment of flood risk, the management of water resources in an area through the simulation of long rainfall sequences and as a short term rainfall forecasting tool, to name a few. The String of Beads Model (SBM) is a high-resolution space-time model of radar rainfall images. It is a stochastic model that takes advantage of the detailed spatial and temporal information captured by weather radar and combines it with the long term seasonal variation captured by a network of daily raingauges. The alternating wet-dry process, or event arrival and duration, is modelled as a one dimensional process, while the detailed wet process is modelled as a three-dimensional (two space and one time) process at 1km, 5 minute spatial and temporal resolutions respectively, over an area of 16000km2, consistent with the observed radar data. The three-dimensional rainfall events distributed on a one-dimensional time line, is analogous to a "String of Beads". The SBM makes use of a combination of power law numerical filtering techniques and well-known time series models to achieve an efficient algorithm that can be run on an ordinary personal computer. Model output is in the form of image files which, when viewed as an animated sequence, are difficult to distinguish from observed radar rainfall images. Apart from the realistic appearance of these images, when calibrated to daily raingauge data for the region, analysis of the simulated sequences over periods of up to ten years, reveal convincing rainfall statistics for a wide range of spatial and temporal scales. It can be used both as a simulation tool and as a short term forecasting tool. In simulation mode, it can quickly produce long sequences (tens of years) of 128 x 128 km rainfall images at five minute, one kilometre resolution. Such simulations can be used as input to distributed and semi-distributed hydrological models to produce "what if" scenarios for applications in water resources management and flood risk assessment amongst others. In forecasting mode, the SBM has proved effective in producing real time forecasts of up to two hours making it a useful tool for flood warning and management, particularly in steep or urban catchments which react quickly and often give rise to flash floods. It can also be used in a combined simulation-forecasting mode to quickly produce many short term "what if" scenarios which can be used to assess the risk of possible growth or decay scenarios in real time. / Thesis (Ph.D.)-University of Natal, Durban, 2003.

The study was designed to generate data and information necessary for designing an appropriate sustainable solid waste management system, and examining the socio-economic benefits of urban municipal so lid waste management through job creation opportunities (albeit mainly informal) in Lesotho. The review of literature on the integrated solid waste management systems at international, regional and local levels in relation to job creation was carried out with a view to establish the necessity of carrying out this research. In addition, specific solid waste management experiences and practices in other countries have been cited. In Lesotho, investors and donors have, for long expressed the need for formulation of solid waste management policy and guidelines formulated in the country in order to create an enabling environment for investment. However, the process of preparing policy and guidelines requires substantial data and information. This study supplemented this effort by gathering data and information. The data and information gathered were on the existing policies and regulatory framework concerning waste management; waste generation rates, types and quantity from domestic, industrial and commercial establishments; recycling activities; and the waste harvesting (scavenging) activities. The study was undertaken in Maseru and Maputsoe, being the hub of commercial and industrial activities in the country. The data and information may also be useful to other SADC countries From the results of the study, it has been concluded that in Lesotho, paper was the most commonly generated waste in all the categories: domestic, industrial and commercial establishments. Plastic was the second category of the most commonly generated waste, which was followed by organic waste, and then, beverage cans. The study established that the weighted average household generation rate for the surveyed areas was: 0.13 Kg per capita day-I. In the same findings, it occurred that overall, households contribution to waste generation in the surveyed areas ranked second to commercial establishments despite their low per capita, in comparison with industrial establishments. The study has further concluded that out of an estimated total quantity of 157552 tonnes per annum of waste generated in Maseru, commercial establishments contributed 82%, while households contribute 15% and industrial establishments 3%. Households generated more waste than industries because they were in large numbers and hence contributed more than fewer industries. It has also been established that the household waste generation is dependent on incomes ofthese households, but had poor relationship with regard to the number of persons per household. To this effect, it was seen that high-income households generated more waste than low-income. The study further showed that where the municipal council offered waste collection service, not all recipients paid for this service. However, there was a general willingness- to- pay for the waste collection service by all sectors, on condition that there was an improvement in the offering of this service; and if made available where currently not offered. Furthermore, there was a general indication of affordability for these services up to a certain amount (albeit minimal) per different sectors. On the other hand, the information collected strongly indicated the need to invest more in solid waste management if this would be a means of employment creation and improvement of the environment. On the overall, the study revealed that there was a low level of awareness on waste related policy and regulatory instruments, and fragmented legal framework on waste management in Lesotho. The study also established that currently, solid waste as an informal sector generated an estimated profit of MO.7rnillion per annum from waste recycling related activities and that this informal sector generated about 282 jobs. In addition to these benefits, the question of solid waste as a source of biomass energy was another beneficial route in Lesotho. It has been established that the combustible organic waste was highly sought after as a source of energy for cooking and heating. However, besides the benefits, these activities also gave rise to some adverse impacts. The waste harvesters expressed that their health had been negatively impacted upon by the waste scavenging activities. Needless to suggest that there would be a need by the government to intervene in this problem by formalising these waste harvesting activities. It is hoped that this study would serve as a reservoiur for the source of data and information and for Lesotho and that other countries in the SADC Region shall fmd this document a useful tool. / Theses (Ph.D.)-University of Westville, 2002.

The construction industry in South Africa is envisaged to play a pivotal role in the reconstruction of the South African economy, via the delivery of economic and social infrastructure. The skewed ownership I patterns prevalent in the construction sector, resulted in the South African government utilising public sector procurement as a mechanism to address these imbalances, and to promote wider participation I in public sector construction opportunities. This dissertation analyses the role of the construction industry in South Africa, and explores the rationale behind utilising public sector procurement as a mechanism to promote wider participation in the construction industry in South Africa. The research then focuses on the application of the Affirmative Procurement Policy (APP) on construction projects procured by the National Department of Public Works, in order to evaluate the impact which this policy has had on the growth and development of Affirmable Business Enterprises (ABEs). The research evaluates the primary policy outcomes, via the development of appropriate indices and a diagnostic quadrant comparator, and concludes that the application of the APP has had a positive impact on ABE participation, with levels of participation varying across construction sub sectors and categories. It was also found that financial premiums, borne by the State in adopting this policy, were nominal when compared with the initial projected outcomes and the overall benefits. The overall performance of ABEs, measured against that of non-ABEs, was then tested to ascertain whether the adoption of the APP was a necessary and sufficient condition for ABE enablement and empowerment. The research concludes that there is a difference in overall performance between J ABEs and non-ABEs, and that supply side interventions and capacitation programmes are required to mitigate the increased risk exposure by the State, when engaging ABEs on construction projects. The : research also analyses the variation in the levels of participation of ABEs, in the different construction sub sectors and concludes that the manner in which ABEs are structured and their internal business processes tend to establish operational limitations, which influence their scope of activitiies to a larger extent than the existence of eternal sub sector thresholds. Similar characteristics were,observed in non-ABEs of a similar size, inferring that the problems encountered relate to business development and growth of small and medium enterprises, in general. The research also. analyses the impact that the APP has had on subcontracting relationships and the promotion of structured joint ventures. It concludes that whilst the requirements of the APP has seen the development of formalised subcontracting relationships, the form of subcontracts that are currently utilised do not comply with the requirements outlined in the APP, which are aimed at eradicating unfair subcontracting conditions. The adoption of the APP has seen an increase in structured joint ventures between ABEs and larger established contractors. The analysis of these joint ventures concludes that they provide an effective means of transferring expertise, provided that they are structured appropriately. The dissertation concludes with recommendations on APP policy refinements, mechanisms to enhance compliance and opportunities for international application. The recent enactment of the Preferential Procurement Policy Act (Act 5 of 20(0) in South Africa indicates that several elements of the APP are likely to be prescribed as mandatory requirements for public sector procurement by different government institutions and across the different industrial sectors. It is therefore important that the areas identified for further research be pursued, to ensure optimal policy outcomes across a range of industrial sectors. / Thesis (Ph.D.)-University of Natal, Durban, 2000.

The landfilling of Municipal Solid Waste poses a threat to the environment in the form of landfill emissions. These emissions are a result of the biochemical breakdown of the waste in the anaerobic landfill environment. A solution to this problem has been found in the form of the mechanical-biological treatment of waste. This technology involves mechanical and biological processing of the waste before it is placed in the landfill. The pretreatment accelerates the degradation of the waste resulting in the landfilling of a more biologically stable product, resulting in a reduction of the emission potential of the landfill. This research aims at investigating the applicability and efficiency of a passively ventilated MBT windrow system under a sub-tropical climate. The research was conducted in two stages: the first stage focused on the implementation and analysis of the Mechanical Biological Treatment (MBT) process with aerobic windrows, employing the Dome Aeration Technology (OAT) (Mollekopf et al. 2002). Three OAT windrows were constructed at the Bisasar Road Landfill in Durban in order to study the efficiency of the process after different composting timeframes (8 and 20 weeks). The study proved that the use of the OAT technology is a viable option. The second stage was the analysis of this treated waste in an anaerobic environment, in order to simulate landfill conditions and, thus gain insight into the effect of MBP on landfill emissions. Six Iysimeters and 5 columns as well as numerous eluate tests were conducted in order to study the "post-Iandfilled" behaviour of the waste and the effect that waste treatment, composting time and screening have on liquid and gaseous emissions. A basic cost estimate using the Clean Development Mechanism for financial assistance was conducted. The results of this research were then utilised to make recommendations on sustainable waste disposal options. The findings of the research were that although the MBT did not reduce emission levels sufficiently to allow for a 40 year landfill aftercare period, the benefit over the landfilling of untreated waste is significant. / Thesis (Ph.D.)-University of KwaZulu-Natal, Durban, 2009.

The traditional design methodologies for tunnel and underground excavations are divided in to three categories: Empirical, Analytical, and Observational approaches, whereas in the last years the Numerical approach has strongly become popular both for the intrinsic simplicity of the software packages and their ability to manage problems unsolvable with the classic methods. In this thesis, the underground openings have been analyzed using constitutive models other than the Mohr-Coulomb theory. FLAC is used for the analysis and the software has been implemented to include the Polyaxial Strength Criterion. The details of the modifications made in the software are presented and the results are compared with the Singh's elasto-plastic stress distribution in squeezing grounds. The applicability of the Polyaxial Strength Criterion has been therefore extended to all the numerical suites designed for geo-mechanical purposes (FEM, FDM, …) and the obtained results compared to the observations of deformation and radial squeezing pressure of the instrumented tunnels in the Chibro-Khodri underground power station. This study will develop better comprehension of the behavior of the underground openings and also provide a useful tool to the designers in the planning stages. / Thesis (Ph.D.)-University of KwaZulu-Natal, Durban, 2012.

In March 2007 the KwaZulu-Natal coastline was devastated by an extreme storm event. There is international concern that such events are associated with climate change. There is evidence of global changes in climate but there is still uncertainty as to whether they are anthropogenic or part of natural decadal (or longer) cycles. The increase in frequency and intensity of extreme storm events will impact on the sediment dynamics of coastlines and the associated risks need to be modelled and quantifed so that they can be included in coastal planning and management. Durban is a coastal city on the east coast of South Africa and has been used as a case study to identify trends in wave parameters and beach profile volumes. The correlation between profile erosion, waves and tides was explored using singular spectral analysis. The dependence between wave parameters was modelled using copulas. The decadal trends were introduced into these models using a nonstationary generalised extreme value distribution. Numerical models (SWAN, SBEACH, XBEACH) were used to transform the statistical model to near shore waves and estimate the associated erosion. The copula model was used to investigate the relationship between multivariate return periods and erosion return periods. Coastal defence options were reviewed and those appropriate for Durban were identifed. This study provides a review of Durban and Richards Bay's 18 years of Waverider data. It presents wave parameter exceedance statistics and wave height return periods for Durban. Durban's wave data showed increasing trends in maximum significant wave heights, peak wave period, storm event frequencies and a trend towards a more southerly mean wave direction. However, only the increase in peak period and wave direction was statistically significant. The trend in wave direction is considered a potential coastal hazard as it has the potential to increase the littoral drift by 1 % per annum. Durban's beach profiles have shown a long term erosion trend which is due to a combination of wave and sea level trends, and a reduction in sediment supply. The reduction in sediment supply from rivers was found to be both anthropogenic and natural. Storm, wave parameter and sea level trends were estimated to contribute more than 75 % to the total long term erosion. It was found that it takes an average of 2 years for a beach to recover to its pre-storm volume. Different types of coastlines recover at different rates and these recovery rates should be considered in risk assessments. A method for estimating future impacts due to storm and sea level trends has been proposed in the form of a non-stationary copula based statistical model. In general a bivariate return period of wave height and duration was found to approximate erosion return periods, while a method for estimating an analogous multivariate storm and erosion return period was developed. Geotextile sand filled containers were found to be a suitable coastal defence as they satisfy social, environmental and political pressure. / Thesis (Ph.D.)-University of KwaZulu-Natal, Durban, 2012.