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17 December 2018 | Story Andre Grobler | Photo Supplied
Drought read more
Water-saving initiatives have been implemented throughout the university’s campuses to withstand the drought.

An attentive visitor to the University of the Free State (UFS) would have noticed that in the past year, certain parts of the Bloemfontein Campus’ gardens have undergone a change. This is part of the UFS’s water-wise and grey-water initiatives that are a response to the ongoing local drought conditions and water restrictions.

Waterless gardens

Senior Director: University Estates, Nico Janse van Rensburg, says the environmental conditions have had a severe impact on the appearance of the gardens. “The era where we had big lawns, has passed.”

Janse van Rensburg says the UFS decided to start the initiative at two highly visible areas, two traffic circles, one at the George du Toit Building and the other the Francois Retief Building.

More landscape changes can be seen in the gardens around the Biotechnology Building, Geography building and Muller Potgieter Building, as well as near the Institute for Groundwater Studies, Engineering Science and the Thakaneng Bridge.

Towards an energy-efficient environment

Paving in these areas is designed to allow for water to soak into the ground. Acting Grounds Services Manager, De Wet Dimo, says more than 100 indigenous trees, which are more adaptive to local environmental conditions, have also been planted. He says a new wood chipper which was recently purchased, will turn dead trees in gardens into wood chips to be used as mulch for new plants.

Dimo says the new look and feel of the gardens was created by using hard elements, paving and indigenous succulents.

New student residences, including those in Qwaqwa and South Campus will use a grey-water system using water which will be collected from showers and basins. The piping at two older residences on the Bloemfontein Campus has also been renovated to a two-way system.

“Rainwater harvesting systems have been fitted at all residences and academic buildings,” said Dimo. The 19 tanks that have been installed have a storage capacity of 265 kilolitres.  Janse van Rensburg says other water-wise initiatives that have been put into action include installing waterless urinals in administrative and academic buildings, water restrainers, pressure control systems (reducing the volume of water) and push-button systems instead of taps.

News Archive

Water erosion research help determine future of dams
2017-03-07

Description: Dr Jay le Roux Tags: Dr Jay le Roux

Dr Jay le Roux, one of 31 new NRF-rated
researchers at the University of the Free State,
aims for a higher rating from the NRF.
Photo: Rulanzen Martin

“This rating will motivate me to do more research, to improve outcomes, and to aim for a higher C-rating.” This was the response of Dr Jay le Roux, who was recently graded as an Y2-rated researcher by the National Research Foundation (NRF).

Dr Le Roux, senior lecturer in the Department of Geography at the University of the Free State (UFS), is one of 31 new NRF-rated researchers at the UFS. “This grading will make it possible to focus on more specific research during field research and to come in contact with other experts. Researchers are graded on their potential or contribution in their respective fields,” he said.

Research assess different techniques
His research on water erosion risk in South Africa (SA) is a methodological framework with three hierarchal levels presented. It was done in collaboration with the University of Pretoria (UP), Water Research Commission, Department of Agriculture, Forestry and Fisheries, and recently Rhodes University and the Department of Environmental Affairs. Dr Le Roux was registered for 5 years at UP, while working full-time for the Agricultural Research Council – Institute for Soil, Climate and Water (ARC-ISCW).

Water erosion risk assessment in South Africa: towards a methodological framework
, illustrates the most feasible erosion assessment techniques and input datasets that can be used to map water erosion features in SA. It also emphasises the simplicity required for application at a regional scale, with proper incorporation of the most important erosion-causal factors.

The main feature that distinguishes this approach from previous studies is the fact that this study interprets erosion features as individual sediment sources. Modelling the sediment yield contribution from gully erosion (also known as dongas) with emphasis on connectivity and sediment transport, can be considered as an important step towards the assessment of sediment produce at regional scale. 
 
Dams a pivotal element in river networks

Soil is an important, but limited natural resource in SA. Soil erosion not only involves loss of fertile topsoil and reduction of soil productivity, but is also coupled with serious off-site impacts related to increased mobilisation of sediment and delivery to rivers.

The siltation of dams is a big problem in SA, especially dams that are located in eroded catchment areas. Dr Le Roux recently developed a model to assess sediment yield contribution from gully erosion at a large catchment scale. “The Mzimvubu River Catchment is the only large river network in SA on record without a dam.” The flow and sediment yield in the catchment made it possible to estimate dam life expectancies on between 43 and 55 years for future dams in the area.
 
Future model to assess soil erosion
“I plan to finalise a soil erosion model that will determine the sediment yield of gully erosion on a bigger scale.” It will be useful to determine the lifespan of dams where gully erosion is a big problem. Two of his PhD students are currently working on project proposals to assess soil erosion with the help of remote sensing techniques.

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