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Groundwater the saviour we need to take care of

20 January 2021 | Story Elsabe Brits | Photo SADC-GMI

Eekci Lukas_web read more — Dr Eelco Lukas, a geohydrologist, is the Director of the Institute for Groundwater Studies at the University of the Free State (UFS).

Nearly two-thirds of South Africa depends solely or partially on groundwater for domestic needs, and in a water-stressed country this source is becoming increasingly important. But we need to use it wisely.

Dr Eelco Lukas, a geohydrologist, is the Director of the Institute for Groundwater Studies at the University of the Free State (UFS). He explains that all the natural water found in the earth’s subsurface is called groundwater. “When we look hard enough, we can find groundwater almost everywhere. But that does not mean that we can start pumping groundwater at any location. In many places, the amount of groundwater available (yield) is so little, or the water so deep that it is not financially viable to pump it. Another problem might be the quality of the water.”

Numerous towns and communities depend solely on groundwater and many towns use a combined supply of surface and groundwater. When the town or settlement is far from any surface water and groundwater is available, boreholes are drilled. Depending on the size of the settlement, the boreholes are equipped with electrical or hand pumps.

Most of the big cities use surface water in their water pipes. Almost all big cities worldwide are located close to a supply of freshwater. Cape Town has drilled many boreholes in the past two years to augment the city’s water supply. However, problems can arise when a borehole is drilled for a community with a certain number of people, and soon there are more people than the borehole can supply for. It is not so much a case of the ‘borehole drying up’ but that the capacity has been exceeded.

Misconceptions about groundwater

With increasing drought and water restrictions being imposed, many people opted for their own borehole. When so many people draw water from the same source, the water table will drop. It can be compared to drinking a milkshake, but when five other people also drink with straws from the same milkshake, all will be left thirsty.

Dr Lukas says because groundwater is something that cannot be seen with the naked eye, the general public has many misconceptions about groundwater. Some people think that you can drill a hole just anywhere and that you will find water, while others believe that water flows in underground rivers. It generally moves very slowly, only a few metres per year. And if it rains in a specific place, it does not mean that water will reach a particular borehole.

“Sustainable groundwater usage is the certainty that enough groundwater is available in years to come. Sustainability is dependent on two external factors, namely demand and supply. Unfortunately, both these factors are beyond the control of the geohydrologist. When enough water is available for a community, the chances are that the community starts to grow, thereby enlarging the demand. If the higher demand cannot be met, sustainability is no longer possible. When a change in rainfall pattern results in a decline of the precipitation, the groundwater recharge will become less, resulting in a lower supply of water.”

How does water move?

Groundwater moves through openings in the subsurface. These openings can be large (a millimetre to a few centimetres), but most of the time they are small, only a fraction of a millimetre. These are called pore spaces. Water can only move through the pores if the pores are connected to other pores. The ease with which water can move through the rock is called hydraulic conductivity and is expressed in volume per area per time.

Dr Lukas explains that different types of rock have different sizes of pore openings. The speed at which water can move through unconsolidated materials ranges from 1 000 m/d (gravel) to 10-8 m/d (clay). Consolidated materials range from 1 000 m/d (highly fractured rock) to 10-7 m/d (shale). Sandstone, a rock that occurs in abundance in South Africa, has a typical hydraulic conductivity of 10-2 m/d, meaning that the speed at which the water flows is around 1 cm/d, which is less than 4 metres per year.

In a way, you can compare groundwater flow to a pipe filled with marbles. If you remove one marble at the one side, a marble may enter the pipe on the other side. Although it may take the marble a long time to reach the other side of the pipe, the movement of the marbles is noticed almost immediately, says Dr Lukas.

Before groundwater is used, experts must make sure that it is suitable, Dr Lukas says. This is one of the areas that the Institute of Groundwater Studies at the UFS excels in. The institute also provides a complete service to industries through field investigations, the development of specialised field equipment, a well-equipped commercial and water research laboratory, and a number of computer models for the management of the aquifers, protecting them from pollution.

There are different standards for different purposes. The best-known standard is the drinking

water standard (SANS 241). The water is tested for microbiology, as well as for the physical, aesthetic, operational and chemical determinants, and for the taste and colour.

There are several geophysical methods to locate groundwater. “It must be stressed that the geophysical methods do not actually indicate places with water, but rather places where the geology and geological features support the presence of groundwater,” he says.

Different techniques are used to ‘look’ at different depths. Water found close to the surface (upper 20 m) is often young water, meaning that it has been recharged not too long ago. Because it is so close to the surface, it is vulnerable to contamination. Deeper water is probably a bit older and because it is farther below the surface, it is more protected against surface contamination and the quality of this water is generally good. Really deep groundwater (> 200 metres deep) will be even older and may have elevated salt content due to the long residence time of the water.

How much groundwater do we have?

Groundwater is a significant source of water, and in some parts of the country the only source of potable water. According to the Department of Water Affairs and Sanitation, the most recent estimate of sustainable potential yield of groundwater resources at high assurance is 7 500 million m³/a, while current groundwater use is estimated at around 2 000 million m³/a. Allowing for an underestimation on groundwater use, about 3 500 million m³/a could be available for further development. Unfortunately, if there is a shortage of water on one side of the country, it cannot be supplemented with water from the other side.

With a drought, the amount of water falling from the sky is below average, which means that the available water to recharge is also less. With less recharge water, the groundwater levels will decline. To make things worse during a drought, groundwater users will pump more water to make up the deficit in rainfall, thereby accelerating the drop in water levels.

“Groundwater can be used to help humanity. The pore space in aquifers can be used to store water during a wet period, to be used later during a drought. This is called water banking, where water is injected into the aquifers (artificial recharge) during a period when there is enough water and pumped from the same aquifer during a period of water shortage,” says Dr Lukas.

News Archive

During 2011: Achievements at the UFS

2011-12-01

Sarah Shannon

Dr Alex Amtaika, Department of Political Science

During a conference at Khon Kaen University in Thailand, Dr Alexius Amtaika from our Department of Political Science was elected as Executive Director and Convener of the International Committee of Scholars of Local Government. This honour was bestowed upon Dr Alexius during the first International Conference on Local Government at Khon Kaen University.

Sarah Shannon

We all have heard stories about inspirational people, who defy the odds, fight circumstance every day and never give up. Sarah Shannon has cerebral palsy but has never stopped dreaming and achieving them.

Sarah is also a competitive swimmer, and is currently ranked seventh in the world in her class of disabilities.

She is currently completing her postgraduate certificate in Education, Foundation Phrase, through Unisa. She is also studying Sociology at our university.

DW Bester and Sannah Mokone, Rhodes Scholars

Of the four open Rhodes Scholarships available to students from all universities in Southern Africa, two of our students won these prestigious scholarships. DW Bester, B.Sc. Hons. Actuarial Science student, and Sannah Mokone, BPub-cum laude student, joined Oxford University in the United Kingdom in September 2011 to further their studies.

The Rhodes Scholarships, arguably one of the most prestigious scholarships in the world, were founded in 1903 in the will of Cecil John Rhodes and cover the full costs of study at Oxford University.

While academic excellence is a pre-condition for consideration for the Rhodes Scholarship, these scholarships are unique in that Rhodes Scholars are outstanding young students who excel academically, but very importantly, demonstrate leadership, are committed to making a difference in the world, and have the energy to fulfill their ambitions.

Dr Derik Coetzee, Department of Sport and Exercise Sciences

When you suddenly receive a call during a World Cup year and requested to come and assist in leading the Springboks, then you have to know, you have something to offer. This is what happened to Dr Derik Coetzee from our Department of Exercise and Sports Sciences. This year he once again became involved in the Springbok rugby team, after he had been die Bokke’s conditioning trainer from 2004 to 2007.

His primary task as conditioning head was to help in seeing to it that the Springboks reached their best level of play – psychologically, physically an emotionally. Amongst others, his duties included the optimisation of the players’ muscle and explosive power, speed, anaerobic ability and technical skills.

Jefferson J Dirks-Korkee en Mart Kotzé

Jefferson J Dirks-Korkee, from Willowmore in the Eastern Cape, and Mart Kotzé from Bloemfontein, recently made history by being the first students from our Department of Drama and Theatre Arts featuring in an Afrikaans South African film Skoonheid, the first ever to be shown at the Cannes Film Festival.

The movie won the Queer Palm Award at the 2011 Cannes International Film Festival, where Robert de Niro was the chairperson of the panel of judges.

Prof. Muriel Meiring, Department of Haematology and Cell Biology

Prof. Muriel Meiring, Specialist Scientist in our Department of Haematology and Cell Biology, is responsible for establishing the Specialised Haemostasis Laboratory at our university and the Universitas Hospital’s National Health Laboratory Service. She established this centre as a reference centre for Von Willebrand disease, a genetic bleeding disorder, in South Africa. This laboratory is internationally recognised for their research and as a reference laboratory.

Prof. Meiring develops and tests antithrombotic (anti-clotting) agents and her long list of publications, research awards and congress presentations has earned her a nomination for the Department of Science and Technology’s Distinguished Woman Scientist Award. She was one of two scientists of the National Health Laboratory Services (NHLS) to receive the award – Prof. Meiring being the only woman from our university.

Medical facilities from all over the country make use of her and her team’s expertise when testing for blood disorders and she hopes to expand the centre even further.

Melinda Jonker

Melinda Jonker, one of our third-year financial economic students, won the overall national competition of the prestigious Traders Trophy competition at the Johannesburg Stock Exchange (JSE).

The competition, sponsored by Nedbank Capital and Oxyor in Amsterdam, requires participants to trade actual JSE-listed shares against one another on a simulated platform. The winner is determined not only by the highest profit, but also by the technique used throughout the trading session.

Christopher Diab, also a student from our Department of Economics, won the regional UFS competition.

ASSAf members

Seven of our academic colleagues have been elected as members of the Academy for Science of South Africa (ASSAf). They are Proff. Hendrik Swart, Physics; André Roodt, Chemistry; Zakkie Pretorius, Plant Sciences; Max Finkelstein, Mathematics; James du Preez, Microbial, Biochemical and Food Biotechnology; Maryke Labuschagne, Plant Breeding; and Neil Roos from our Postgraduate School.

Due main objective of the Academy is to promote and apply scientific thought in the service of the society, in order to determine the quality and scope of the role that the Academy can plays in the country’s life and progress, and eventually apply it

Other colleagues who are currently members of ASSAf include Proff. Jonathan Jansen, Vice-Chancellor and Rector; Johan Henning, Dean: Faculty of Law; and Frans Swanepoel, Senior Director: Research Development.

Samantha Renda-Dollman

Samantha Renda-Dollman, a BSc (Zoology) student on our Qwaqwa Campus, has obtained 19 distinctions out of the 22 modules she has written since 2009.

Her hard work earned Samantha the prestigious Dux Student award of our 2011 Annual Student Affairs Excellence Awards, held at our Qwaqwa Campus. This makes her the best overall academic performer of the entire student body on this campus.

Jaco Griessel

Jaco Griessel, an Honours student at our Odeion School for Music, received a prestigious Mandela Rhodes bursary for 2012 to study towards his Master’s degree next year.

Jaco, who is currently busy with his BMus Honours degree, is a performer par excellence, with many achievements to his name. In 2010, he received the Fanie Beetge Prize for the best undergraduate student in Systematic Music Studies. A year before, he received the same prize as best undergraduate student in Historic Music Studies. He shall continue his Master’s degree with Music Composition as field of specialisation at our university in 2012.

Prof. Helena van Zyl, UFS School of Management

Prof. Helena van Zyl, Director of the UFS Business School, was elected as President of the South African Association of Business Schools (SABSA). Since the beginning of 2010 she has been acting as president. Prof. Van Zyl is the first woman to occupy this position and also the first woman who is currently heading a business school in South Africa. She will serve SABSA as the president for the next two years.

Prof. Zakkie Pretorius, Department of Plant Sciences

Research by Prof. Zakkie Pretorius from our Department of Plant Sciences, has become part of Phase II of a mayor global project to combat deadly strains of a wheat pathogen that poses a threat to global food security.

Prof. Pretorius focuses on the identification of resistance in wheat to the stem rust disease and will assist breeders and geneticists in the accurate phenotyping of international breeding lines and mapping populations. In addition, Prof. Pretorius will support scientists from Africa with critical skills development through training programmes.

The Ug99 strain was discovered in Kenya in 1998, but are now also threatening major wheat-growing areas of Southern and Eastern Africa, the Central Asian Republics, the Caucasus, the Indian subcontinent, South America, Australia and North America.

Prof. Danie Strauss, research fellow in the Faculty of Humanities

Prof. Danie Strauss, a research fellow in our Faculty of the Humanities, won the Dooyeweerd Prize from the Board of the Association for Reformational Philosophies in Amsterdam. Prof. Strauss, former Dean of our Faculty of the Humanities and head of our Department of Philosophy, won the prize for his book Philosophy: Discipline of the Disciplines. The prize is awarded for work in the field of systematic philosophy.

Nida Jooste and Ryan Lamb, Abe Bailey Travel Bursary holders

Nida Jooste and Ryan Lamb are two of the proud recipients of Abe Bailey Travel Bursaries. Both students are academic achievers, but also excel in other fields. This is what set them apart from the rest of the applicants for the bursaries.

Ryan (23), a Medical Physics Honours student at our Faculty of Health Sciences, received the Senate’s Medal for the best Bachelor’s Degree student at the UFS. He was one of 100 students at the Brightest Young Minds Summit this year and was one of the 2008 delegates to the World Youth Forum, hosted by the International Association for Poetry and Solidarity in Italy.

Nida (21) is a very familiar face on our Bloemfontein Campus, as she served as the Deputy Chairperson of our Interim Student Council in 2011.

Loerie Award for Tarran Jacobs, Elizabeth Forson and Mafohlela Mahlatsi

The creativity of a group of students from our university was rewarded with a bronze Loerie Award after they won an internal competition. Tarran Jacobs, Elizabeth Forson and Mafohlela Mahlatsi, all third-year Marketing Communication students, won the award for an advertisement they designed for Cansa.

Each year, the third-year Marketing Communication students of our Department of Communication Science have the opportunity to flex their creative muscles in the Copy-writing class. The challenge is to design two advertisements for any charity organisation by applying the knowledge they gained from the subject in a practical way. The top three groups are then entered for the Loerie and Pendoring awards – two of the most prestigious awards in the South African advertising industry.

The top three groups designed advertisements for Cansa, the South African Blood Service and Crime Line.

Hendrik Kruger and Anke Malan walk away with awards at Pfizer UKZN Young Health Scientists Research Symposium

Two students in our Faculty of Health Sciences won awards at a Pfizer UKZN Young Health Scientists Research Symposium.

Hendrik Kruger, a medical student, represented his group, which won the clinical category with the paper “Injury patterns of occupants surviving motor vehicle accidents in the Free State”. This presentation was based on a study which is the first of its kind in South Africa.

The group with Anke Malan from our Department of Nutrition and Dietetics as presenter received the prize in the community-based category with the presentation ’Knowledge, practices and perceptions of undergraduate students at the UFS regarding the risk factors of osteoporoses’. Anke’s team was also nominated as the overall winner of the symposium. Presentations were delivered in three categories, namely clinical, community-based and laboratory research.

Prof. Louis Scott, Department of Plant Sciences

Prof. Louis Scott from our Department of Plant Sciences was formally rewarded the Fellowship of Royal Society of South Africa (RSSA).

Prof. Scott is an internationally recognised Palinologist at our university and a B-rated scientist.

Fellows of the RSSA are considered to be part of a very elite group of South African scientists who have achieved international acknowledgment.

Prof. Aldo Stroebel, International Academic Programmes in the Office of the Vice-Chancellor

Prof. Aldo Stroebel has been elected as a Founding Member of the South African Young Academy of Science (SAYAS).

He is Associate Professor in our Centre for Sustainable Agriculture, Rural Development and Extension, as well as the Director of International Academic Programmes in the Office of the Vice-Chancellor.

The Young Academy has as its objectives to represent young scientists in advising the government on science and technology policy and human resource development. In addition, they will prepare the SAYAS to join the Global Young Academy (GYA) to engage with high-level international bodies, including the World Economic Forum.

Prof. Lodewyk Kock, Department of Microbial, Biochemical and Food Biotechnology

Prof. Lodewyk Kock was a sought-after keynote speaker at various conferences and seminars around the globe on our nanotechnology breakthrough research.

He delivered keynote lectures at international conferences of repute in the USA, China and Greece. In the USA he delivered a the keynote address at the Conference & Exhibition on Pharmaceutical Regulatory Affairs (Pharma-2011), held in Baltimore, and was a keynote speaker at the 2nd World Congress on Biotechnology in Philadelphia. He was also invited to present various lectures abroad.

He posted two video lectures in e-conference format on his research on the web page of the journal Translational Biomedicine. He was also invited by the International Society of Translational Medicine (ISTM) to head their “Molecular Imaging” Division.

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