IMIESA - Volume 34, Issue 7, 2009
Volumes & issues
Volume 34, Issue 7, 2009
Source: IMIESA 34 (2009)More Less
One of the reasons why I left the Cape and moved to Gauteng thirty-four years ago was that I could no longer take the Mediterranean winters - cold, wet and windy. Up on the Highveld winters were marvellous - cold, yes, but with clear sunny skies to bring warmth to the bold and desperate. Today in winter we have weather similar to the Cape, and as far as I am concerned, it sucks. I guess this is all due to global warming and climate change. Which brings me to a point, if weather is now so erratic, as is evidenced by reports from around the world, what are we doing about it? I mean from the perspective of our physical and economic survival. In nature, from the volumes of scientific research, too much or too little of something is generally a bad thing. This applies to water as well.
Source: IMIESA 34, pp 6 –7 (2009)More Less
In his state of the nation address, President Jacob Zuma presented the five-year programme of priorities of this democratic government to the country. Today, all of us must answer this question decisively and with unparalleled commitment. We need to answer this question as elected public office bearers and as public servants in national, provincial and local government, as business people, as workers, as leaders of civil society formations, as religious people, as traditional leaders, as academics, as students and youth, as men and women and as patriotic citizens.
Source: IMIESA 34, pp 8 –15 (2009)More Less
The primary objective of the project is to provide the Port of Durban with a new entrance channel that allows for the safe access of all vessels up to an equivalent size of a 9 200 TEU container ship (length = 350 m, beam width = 45.6 m and draft = 14.5 m) under most weather conditions. The design of the new entrance required consideration of a number of functional and port operational requirements. The primary functional requirements included navigational safety for vessels using the channel and a high degree of availability for all vessels up to and including the design ship. These requirements were to be met without inducing additional sedimentation of the channel, minimising the adverse impact of increased wave energy on the adjacent Bluff and Point berths and maintained within the available land, utility and environmental constraints. In addition, the design was required to allow shipping traffic into the port during construction on a 24-hour basis without undue congestion.
Source: IMIESA 34, pp 16 –19 (2009)More Less
Source: IMIESA 34, pp 24 –26 (2009)More Less
The Department of Water and Environmental Affairs (DWEA) implemented the Hartbeespoort Dam Integrated Biological Remediation Programme, referred to as Metsi a me (my water), a little while ago in an attempt to address the imbalances and unhealthy biological conditions in the Hartbeespoort Dam. The programme focuses on projects with short-term results in parallel with addressing the long-term challenges. Implemented in two phases, phase 1 focuses on establishing biological processes and mechanical harvesting of biomass (algae and hyacinths). Phase 2 focuses on the broader catchment impacts, such as improved storm water management, protection and remediation of wetlands and riparian and in-stream river habitats.
The Cyanobacteria Molecular biology, genomics, and evolution, Antonia Herrero, Enrique Flores : book reviewAuthor David J. ScanlanSource: IMIESA 34 (2009)More Less
Cyanobacteria are a fascinating and versatile group of bacteria of immense biological importance. Thought to be ancient colonisers of the earth, these bacteria are the photosynthetic ancestors of chloroplasts in eukaryotes such as plants and algae. In addition, they can fix nitrogen, survive in very hostile environments, can be symbiotic, have circadian rhythms, exhibit gliding mobility, and can differentiate into specialised cell types called heterocysts.
Source: IMIESA 34, pp 30 –37 (2009)More Less
Author Paul GaydonSource: IMIESA 34, pp 42 –43 (2009)More Less
Wastewater is treated in order to ensure that when it is returned to the river it is safe to drink and will not damage the riverine environment. Proper wastewater treatment is particularly important in South Africa as our rivers are generally very small and thus have little assimilative capacity.
Source: IMIESA 34, pp 44 –52 (2009)More Less
Dewetsdorp is a small town situated in the south-eastern Free State more or less 75 km from Bloemfontein. Together with Wepener and Vanstadensrus it forms part of the Naledi Local Municipality. Like other towns in the region, Dewetsdorp has extended rapidly and services, specifically waterborne sewerage systems, have increased the demand for water. As more water is consumed so the demand for wastewater treatment increases. The existing treatment works can no longer fulfil its purpose.