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A COMPARATIVE STUDY OF LANDSLIDES AND GEOHAZARD MITIGATION IN NORTHERN AND CENTRAL MALAWIMsilimba, Golden Gadinala Ashan Chizimba 04 September 2008 (has links)
In 2003, a number of landslides occurred in the Ntchenachena and the Chiweta
Areas of the Rumphi District in Northern Malawi, and in the Livilivi/Mvai
Catchments of Ntcheu District in Central Malawi. The landslide events caused
significant damage to crops, farmland, livestock and infrastructure. Worse still,
they caused the death of four people. The high density of landslides
occurrences suggested instability of the slopes of these areas.
In light of these landslides, this study set out to assess the slope stability status of
the areas. The study addressed landslide mapping and classification of observed
events; assessment of the causes and contributing factors; assessment of the
socio-economic and environmental impacts of the events; exploration of
traditional knowledge, beliefs and peoples perceptions surrounding landslides;
determination of the coping strategies; and development of mitigations to
landslides as geo-hazards.
This study involved a landslide inventory of all observed This study involved a landslide inventory of all observed events. The physical
characteristics of the terrain influencing slope instability were measured. The
characteristics recorded included slope length, angles, aspect and altitude, and
channel dimensions. Landslides were classified based on the type of movement,
degree of stabilisation, and age, and materials involved in the movement. Soil
samples were collected, using core and clod sampling methods and were
tested for plastic limit, liquid limit, plasticity index, bulk density, hydraulic
conductivity, aggregate stability, and particle sizes. Structural rock weaknesses
were also measured. Vegetation data was collected, using the quadrant
method and was analysed for average diameters at stump and breast height,
canopy cover, and height. Questionnaires/surveys were used to assess local
knowledge and perceptions towards landslides. A SPSS statistical package was
used to analyse both social and physical data. It was found that 131 landslides had occurred of which 98 were in the Rumphi
District, Northern Malawi and 33 occurred in the Ntcheu District, Central Malawi.
The variations were observed to be due to the degree of disturbance of the
physical environment. The Ntchenachena Area, with the highest density (88),
was under cultivation and the afro-montane vegetation had been completely
destroyed. The deepest channels were observed in the Ntchenachena Area,
partly because of the deep chemical weathering of the basement. In contrast,
the rest of the areas had thin soils. Slope aspect and type were found to be of
little significance in the occurrence and spatial distribution of the events.
The analysis of data suggested that the events were caused by liquefaction of
sand and silt fractions due to high and prolonged precipitation. The evidence
from the Chiweta and the Mvai Areas suggests that high cleft water pressure
between rock and soil masses might have caused some failures. However,
destruction of vegetation, cultivation on marginal lands, high slope angle,
weathering of the basement, and slope cutting contributed to the instability.
The study also noted that the Ntchenachena, the Mvai and the Livilivi Areas
largely require soft solutions to the landslide problem. These include afforestation,
proper siting of houses, and restricting settlement activities in danger-prone
areas. Income generating activities to reduce poverty, community participation
in natural resources management and public awareness and outreach
programmes are highly recommended. The Chiweta Area requires urgent major
engineering works such as construction of embankments, cable nets, wire
meshes, improving drainage and plugging. Stabilisation and rehabilitation of river
banks is also recommended to minimize bank collapse and flooding. Integration
of traditional knowledge into the existing scientific body knowledge is critical to
a better understanding of the mechanisms that generate landslides
Further work needs to be carried out in areas of willingness to relocate to safer
ground; change in production system; geological analysis of the Chiweta beds; hydro-geological assessment of the areas; development of landslides predictive
models for Malawi; and the development of a landslide early warning system.
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THE SOCIAL IMPACTS OF A LARGE DEVELOPMENT PROJECT: THE LESOTHO HIGHLANDS WATER PROJECTMatli, Moeketsi Boniface 26 September 2006 (has links)
Projects are regarded as vehicles for development; developments are meant to
enhance the quality of human life. Various types of development projects are carried
out depending on the prevailing problems or opportunities, needs, objectives, target
communities or areas, and the availability of resources and funds. Projects should
have relevant activities particularly in the developing world in order that they can
positively contribute towards developing mankind. Further, it is possible that some
large water development projects like the Lesotho Highlands Water Project could
easily be ill-considered developments resulting in extremely high costs and
tremendous damage to the environment and human beings. Therefore, projects
should ensure that the environmental impacts are properly mitigated, and that the
distribution of benefits is fair while assuring that the underprivileged benefit well.
A successful water development project must deliver to those immediately affected
and to those it is meant to develop. The 1986 Water Treaty between the governments
of Lesotho and South Africa guarantees better livelihoods for affected communities.
Fixed royalties from the water sale, the variable royalties from taxes on some project
activities and earnings from other activities such as increased tourism are expected to
generate revenue income to raise the countryâs economy. Simultaneously,
hydroelectric power is to make the country self-sufficient in energy. However, LHWP
has spawned differing opinions on whether or not it has been a successful project this
far. This is because its social impacts are mixed with benefits and detriments affecting
many people and societies within Lesotho particularly in the project affected areas.
The study has been conducted by holding discussions with sampled communities in
dam-affected areas as well as in unaffected areas for broader national perspective.
This has also afforded the opportunity to determine what Basotho locals think of
LHWP. The mayhem of assets compensation, resettlement of displaced communities
and the rural development programs in which LHWP finds itself in are the major
determinants. Of prime importance is the compliance with the water Treaty signed by
the Lesotho and the South African governments to better the well-being of affected communities. Comparative case studies show similarities of these socio-environmental
impacts.
The study focuses specifically on the rural dam development of Ha Katse and Ha
Mohale in a developing country where poverty, lack of services and
underdevelopment are dominant. It establishes how the negative and positive impacts
affect people of the areas under study after nearly twenty years of the projectâs
existence. Further, it aims to ascertain if social benefits engendered by LHWP vis a vis
the cost of asset and resource losses borne by the Basotho justify the project, and
whether the envisaged objectives have been met.
Therefore, the study endeavours to determine the social impacts of LHWP as
experienced and told by those affected by the dams and those that it is meant to
develop. It also takes cognisance of the views of the water project authority, the
Lesotho Highlands Development Authority, in this respect. Furthermore, through some
recommendations, it sets out to encourage ever more that the project should be
successful in that the benefits of the dams should encapsulate balanced economic,
environmental and social sustainability.
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A SPATIAL MULTI-RISK HAZARD ASSESSMENT AND VULNERABILITY STUDY OF MADIBENG [NORTHWEST PROVINCE]Stols, Martin 04 October 2006 (has links)
A new act on Disaster Management has been introduced in South Africa that will shift
the focus of Disaster Management to a pro-active approach. The new Disaster
Management Act, Act number 57 of 2002, states that all Municipalities should provide
for: âAn integrated and co-ordinated disaster management policy that focuses on
preventing or reducing the risk of disasters, mitigating the severity of disasters,
emergency preparedness, rapid and effective response to disasters and post disaster
recoveryâ.
Because of this it is important to identify areas that are at risk of any disaster and to
introduce mitigating measures to ensure that any foreseeable impacts on the community
are limited as much as possible. It is thus important that a disaster risk assessment must
be performed for every Municipality that can be used in the planning process.
A great deal of information needs to be gathered and analysed in the risk and
vulnerability assessment process. Geographic Information Systems (GIS) provides the
ideal platform from which to analyse large quantities of environmental, demographic,
cadastral and infrastructural data and represent it spatially and in a format that is easily
understandable to everyone.
GIS has proven to be a very important tool in disaster management, from identifying hazards and vulnerable communities, to providing information during disaster events and
the recovery process afterwards. It is also a very effective method of gathering and
storing data from different fields and applications to be used for planning mitigating
measures, setting up standard operating procedures for disaster events and coordination
and planning in the event of a disaster.
The purpose of this study was to gather all available information on identified hazards in
the Madibeng Municipality and to use this information to perform a risk and vulnerability
assessment of the Madibeng Local Municipality with the aid of GIS.
The information provided in this study was intended to assist in building a disaster
resistant community by sharing geographic knowledge about local hazards. This study provides information to the Municipality of Madibeng on hazards and people at risk and
vulnerable to different hazards.
Recommendations were then made to the Madibeng Municipality on the application of
GIS in hazard and vulnerability assessments, that should provide the Municipality with a
cost effective and scientific method of addressing Disaster Management related
functions.
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URBAN WATER PROVISION IN MASERU (LESOTHO): A GEOGRAPHICAL ANALYSIS.Molapo, Lifuo 10 November 2005 (has links)
Water is the most important of all basic needs, and is fundamental to all vital processes of
value to mankind. However, statistics indicate that of all the water available on earth, only a
limited fraction is available for human consumption. With the growing world population,
there is increasing demand for water worldwide.
The situation is even more complicated in cities of the developing world that are
characterised by rapid population growth while the economic status is low. This often results
in the demand for water growing faster than the ability to supply. Urban population
expansion in the developing world therefore further complicates the challenge of water
provision. This is a very critical issue because failure to meet the water demands of cities can
put peopleâs lives at risk. The main challenge therefore is to develop appropriate policies
that guide water provision.
This is also the situation in Lesotho. Like other developing countries, Lesothoâs population
has been growing at an alarming rate. Most of the growth has been happening in the capital
city Maseru, which absorbs a high share of the countryâs urban population. However, the
fast rate of urbanisation in Lesotho, particularly in Maseru has not been coupled with the
necessary expansion of water supply systems, thereby causing pressure of the existing
system.
WASA the body that is charged with the responsibility of urban water supply in Lesotho has
since its formulation generally failed to meet its obligation. This is as a result of ineffective
policies that were put in place to guide the authority. About half of the population within
WASAâs area of designation are still unserved. Several policy related issues have resulted in
this. Firstly, the subsidisation of water by disallowing price increases. Secondly, the supply of free water through public standpipes, and thirdly the false assumption that the poor cannot
afford to pay even the minimum charge for water. These issues have not only resulted in
financial instability to WASA thus hindering service expansion, but have also resulted in
denial of service to the poor while the rich enjoyed low cost service. Empirical examination
of the situation on water provision in Maseru has further confirmed the issues discussed
above. From a policy perspective it is therefore imperative tha t water supply services are
expanded and improved to be financially viable.
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AN EVALUATION OF THE SPATIAL VARIABILITY OF SEDIMENT SOURCES ALONG THE BANKS OF THE MODDER RIVER, FREE STATE PROVINCE, SOUTH AFRICA.Tsokeli, Raboroko David 10 November 2005 (has links)
The study focuses on the characteristics of the Modder River in the Free State. The
Modder River plays an important role in supplying water for domestic, agricultural and
industrial uses in the Bloemfontein, Botshabelo and Thaba Nchu areas. According to
present (2001) estimates by the Centre of Environmental Management of the University of
the Free State, the Modder River is exploited to its full capacity owing to the construction
of dams.
As the name of river suggests, the Modder River is said to have high sediment loads. In
Afrikaans, modder means mud. The drainage pattern of the Modder River reveals well-developed
dendritic drainage on the eastern part of the catchment and an endoreic
drainage pattern on the western part.
This study aims to evaluate the spatial variability of sediment sources along the main
course of the Modder River as well as assess the possible role of fluvial geomorphology in
river management. The study is based on the hypothesis that the high sediment load in the
Modder River main course is caused more by riverbank processes than by the surface of
the basin. Helicopter and fieldwork surveys were carried out in order to obtain the required
materials (variables). The spatial variability of bank-forming material, vegetation cover,
type and channel form were investigated in order to realise the aim of this study.
The channel form of the Modder River indicates a decrease in sediment loads since the
channel form shows some shrinkage immediately below the Krugersdrift Dam. The
Modder River transports less and less sediments downstream as a result of a high number
of constructed dams. Dams are barriers that create discontinuities in the channel system.
Observations of the characteristics of the banks of the Modder River reveal that these
banks are resistant to erosion owing to the luxuriant vegetation growth and low stream
power because of the channel gradient. A question arises as to whether the Modder River really has such high sediment loads as
its name suggests. Given the current state of the Modder River, high sediments are highly
localised at certain sections of the stream. The transfer of sediments from one part of the
river to another depends on the availability of sediment sources in space and time.
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A COMPARATIVE STUDY OF THE QUALITY AND OUTCOMES OF ENVIRONMENTAL IMPACT ASSESSMENT REPORTS FROM THE FREE STATE AND NORTHERN CAPE PROVINCESFreemantle, Sophia Johanna 15 February 2010 (has links)
An Environmental Impact Assessment (EIA) determines the economic, social and
environmental impacts of proposed developments. Environmental Impact Assessment reports
are complied by independent consultants in order to provide the authorities with information
on the anticipated impacts on the environment caused by a proposed activity or development.
The authorities therefore base their decision largely on the EIA document and trust that the
information about forecasted impacts are to a large extent accurate. Authorities also trust
that the mitigation measures proposed in the Record of Decisions (RODs) and Environmental
Management Plans (EMP`s), in order to minimize impacts on the environment, are
implemented during the construction and operational phases of a project. Post-authorization
activities such as monitoring and auditing are the only feedback mechanisms to provide
authorities with information on the extent to which predicted impacts materialised and
whether mitigation measures were implemented.
Post authorization activities, especially auditing is to a large extend neglected because it was
not mandatory in South Africa under the Environmental Impact Assessment regulations
promulgated on September 1997 in terms of Environment Conservation Act 107 of 1989.
Therefore the accuracy of predicted impacts and the implementation rate of mitigation
measures in South Africa are to a large extent unknown.
The aim of the study is to assess the accuracy of predicted impacts and the implementation
rate of mitigation measures of activities that received authorization from the Departments of
Environmental Affairs in the Free State and Northern Cape provinces, in South Africa. The
objective of the study is to determine if any improvements are necessary to EIA reports, to
establish whether authorities base their decisions on correct information. The adequacy or
success of proposed mitigation measures will also aid decision makers in suggesting
preventative measures.
The research problem posed in this study was two-fold. First the question relating to the
accuracy of predicted impacts and implementation of mitigation measures in the Free State
and Northern Cape had to be answered. This was done through a method called
impact-backwards auditing. Secondly the question whether the two provinces had similar
outcomes in terms of predicted impact accuracy and implementation of mitigation measures,
had to be assessed. The comparison between the two provinces was conducted through a
series of Pearson chi-square tests on contingency tables to assess if statistically significant
differences occurred in the outcome of predicted impacts and mitigation measures between
the Free State and Northern Cape provinces. This study concluded that no statistically significant differences occurred between the two
provinces in relation to the outcome of predicted impacts and mitigation measures. Predicted
impacts were to a large extent accurately predicted and the majority of mitigation measures
were to a large extent implemented successfully to prevent or minimize an impact.
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ASPEKTE RAKENDE DIE RUIMTELIKE EKOLOGIE VAN DIE ROOIJAKKALS (CANIS MESOMELAS) AS PROBLEEMDIER IN DIE SUID-VRYSTAATDeacon, Francois 19 October 2011 (has links)
According to the Red Meat Producersâ Organisation, damage-causing predators
annually catch small stock to a value of approximately R1,1 billion in South Africa. On
most of the small stock farms in the Southern Free State, black-backed jackals, Canis
mesomelas, are shot on sight and actively hunted to provide a safe environment for
domesticated animals. The veld and habitats previously occupied by natural prey for
these carnivores are now used for commercial farming practices. Carnivores are
conserved in established formal protection and conservation areas within the ecosystem
to lessen their contact with small stock. In South Africa the black-backed jackal
successfully adapts to this farming environment with visible adaptation patterns. These
behavioural patterns are influenced by the circumstances of the animal and variables
within its environment. In the study area these fixed patterns of the black-backed jackal
presumably annually repeat itself. This study researched these behavioural patterns of
the jackal. For the first time, geographic information systems (GIS) are used in the
research of the black-backed jackal.
Since 2006, black-backed jackal regional data (of all jackals killed during hunting
operations) was collected in a high depredation area in the Southern Free State. Data
points collected from 1927 to 2009 were accordingly entered on electronic charts in
ArcView. The total number of data points were obtained from 433 black-backed jackals
killed, with the localities of 344 charted. The data is grouped into four sets: the first set,
collected over 26 years, 1927 to 1953, consisted of 15 black-backed jackals; the second
set, collected over 5 years, 1993 to 1997, consisted of 124 black-backed jackals; the
third set, collected from 1999 to 2008, 10 years, consisted of 210 black-backed jackals;
and the fourth set, from 2006 to 2009, four years, had a total of 84 black-backed jackals.
Therefore, the number of black-backed jackals killed significantly increased, from 15
killed the first 26 years, to 418 over the last 16 years, within the same specific area. The
increase in numbers of black-backed jackals removed from the area is used as indication of the increase in damage over the years in the study area. The average
mass of 68 males, killed between 1993 and 1997, was 7.15kg and 63 females, 6.72kg.
According to the 35 farmers in this specific area of the Southern Free State, the jackal
problem is at present more under control than 30 years ago, which also applies to some
other parts of the Southern Free State and South Africa. The reason for this can be
ascribed to a better understanding of the animals and planning of hunting expeditions.
In the late 1980âs, the average loss per farmer was ± 200 sheep per annum. At present,
about 40 sheep on average are lost per farmer. The aim of this study is to further
alleviate the damage-causing problem in the study area by making accurate predictions
and planning to decrease losses. In the study area, peak losses are noted annually from
August to October and March to May. The black-backed jackals mainly follow certain
fixed movement patterns in the study area and breeding pairs seemingly react to the
same stimuli from their direct environment. The same dens are repeatedly used and
there is a clear relationship between the location of the dens and human activities.
When a breeding pair is removed from an area, a new breeding pair will soon establish
there. The processing of historic data leads to predictions on where the black-backed
jackals will establish, where they will breed and where they will probably cause damage.
It also predicts where they can probably be caught. This study shows a strong
correlation between the physical nature of the environment and the black-backed
jackals.
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SECOND HOMES AND LOCAL ECONOMIC IMPACTS IN THE SOUTH AFRICAN POST-PRODUCTIVIST COUNTRYSIDEHoogendoorn, Gijsbertus 19 October 2011 (has links)
Issues concerning post-productivism have not seen any direct systematic research attention in South Africa. Nevertheless, it has recently been proposed that post-productivism, although difficult to discern in its early stages, has gathered sufficient momentum to warrant scholarly attention in the local context. This study develops this contention by focusing on the role of second homes tourism as a contributor to developing a South African post-productivist countryside using four study areas, namely, Rhodes, Greyton, Dullstroom and Clarens. It is argued that the initial development of productivist countrysides was linked to the apartheid regimeâs concerns over white land ownership, black labour distribution and food security. It is then suggested that although the productivist countryside was under strain towards the final years of apartheid, the dismantling of apartheid agricultural policy and financial support for white farmers led them to seek out other economic opportunities. Movement towards consumptive leisure practices such as tourism and leisure functions has led to a diversification of farming practices resulting in a countryside in which agricultural production has decreased in importance. It is then argued that the stage was set for second homes to emerge as a new phenomenon in the countryside which further enhances the trend towards post-productivism. The project then provides an analysis of the various economic impacts of second homes in four study sites mentioned.
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A CRITICAL REVIEW OF THE QUALITY OF ENVIRONMENTAL IMPACT ASSESSMENT REPORTS IN LESOTHOTalime, L A 19 October 2011 (has links)
Environmental impact assessment (EIA) is one of the tools used by relevant authorities all over
the world in an attempt to ensure that the principles of sustainable development are achieved.
Since the Environment Act (EA) No. 15 of 2001 was passed in the parliament many EIAs have
been conducted in Lesotho. This Act has been replaced with the EA No. 10 of 2008. Though it
was not until June 2009 that the environmental law was promulgated, government institutions
and environmental practitioners have been operating within the provisions of this Act. The
preparation of high quality EIA reports is one component of an effective translation of EIA
policy into practice. The Lee and Colley review package (Lee et al 1999) was used to assess the
quality of 15 EIA reports submitted to the National Environment Secretariat which is now
referred to as the Department of Environment (DoE). The reports comprised of the project briefs
(PBs) and the environmental impact statements (EISs). Interviews with the EIA consultants,
stakeholders and concerned government officials have also been conducted to underpin the root
cause of poor quality of EIA reports. The analysis reveals that several key areas of EIA do not
receive sufficient attention. The inadequacies are particularly in areas relating description of the
development, identification, evaluation and mitigation of key impacts, consideration of
alternatives, and consultation and participation of the public. The government institutions also
show less interest in environmental matters and as a result matters relating to environment are
given less priority. This leaves the effectiveness of the EIA process to be highly questionable.
The study offers suggestions that would improve the EIA process in the country.
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THE INFLUENCE OF CLIMATE VARIABILITY ON FLOOD RISK IN THE //KHARA HAIS MUNICIPALITY (UPINGTON AREA) : A GIS â BASED APPROACHJacobs, Kirsten 22 November 2010 (has links)
The climate of the continents and the world is controlled by complex maritime and terrestrial interactions that produce a variety of climates across a range of regions and continents. Climate influences agriculture, environment, water and even the economy of countries all over the world. The climate of the world varies from one decade to another and a changing climate is natural and expected. However, there is a well-founded concern that the unprecedented human industrial and development activities of the past two centuries have caused changes over and above natural variation. Climate change is the natural cycle through which the earth and its atmosphere accommodate the change in the amount of energy received from the sun.
A hazard is a physical situation with a potential for human injury, damage to property, damage to the environment or some combination of these. It is important to distinguish between the terms disaster and hazard. A disaster is seen as a serious disruption of the functioning of a community or society, causing widespread human, material or economic losses which exceed the ability of the affected community to cope, using its own resources. Disasters can be either natural, for instance a flood, or human induced, such as a nuclear accident. Disasters may furthermore be classified as slow-onset disasters, such as a drought, or sudden disasters, such as an earthquake . The word risk is one of the most notable examples of words with multiple and disparate meanings that may not be commonly acknowledged. Risk may have a technical meaning, referring to a chance or probability, such as risk from exposure, a consequence or impact, an example being the risk from smoking, or a perilous situation like a nuclear power plant that creates a risk. This study examines the influence of climate variability on flood risk in the //Khara Hais Municipality in the Northern Cape. The area that was investigated included the entire Orange River and Vaal River catchment areas where monthly rainfall data, as well as runoff data were used to produce a flood model for predicting a flood event within a two-month period, giving enough warning time to farmers and the inhabitants of the areas that may be influenced by this flood event.
Maps were produced to show the high and low rainfall amounts in the these two catchment areas where randomly selected years and months were taken, as well as showing the one-month and two-month periods before these selected dates. Examples of the highest rainfall recorded, which was in 1988, the medium amount in 1977, and the lowest amount in 1997 were selected. Furthermore, five other such examples were taken to examine the rainfall and climate variation between the years and months ranging from 1950 to 1999.
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