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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

SRC elections of our Bloemfontein Campus
2011-07-26

The Student Council elections of our university at the Bloemfontein Campus will take place on 29 and 30 August 2011. These official election dates were announced by Mr Rudi Buys, Dean: Student Affairs, on 25 July 2011.

Nominations open on Wednesday, 27 July 2011 and the elections, which are constituted according to the SRC Constitution, shall be handled by the Independent Electoral Agency, which shall be instituted by the SRC Constitution with this in view.
 
“The elections introduce a new era in student leadership and governance, because student representation will now constituted in such a way that affords the majority of students the opportunity to vote directly for their representatives. Senior leadership structures are extended in the new Constitution, in order to allow more students to hold senior positions,” states Mr Buys.
 
The SRC elections follow on the approval of a new Constitution that was accepted by our Council on 3 June 2011.
 
The Constitution was drafted over a period of eight months by the Broad Student Transformation Forum (BSTF), consisting of students, in order to design a new dispensation in student structures. The BSTF, which decided on new models of student representation in collaboration with independent facilitators, consists of more than 70 student organisations and residences. The changes to the Constitution were decided on and accepted by the BSTF, after recommendations from four student study groups, which investigated student leadership and governance in depth, at national as well as international level, were taken into account. The study groups visited nine (9) other SA universities, as well as investigated student representation at internationally renowned universities like Cornell, Yale and Stanford in the United States of America.
 
Ms Modieyi Motholo, Chairperson of the Interim Student Committee, says that she is very proud of what the students have achieved with the new Constitution. “I wish to accord recognition to all the students who lead the process for all their hard work. Constitutional revision is a strenuous process and it is nothing short of a miracle that the students could not only reconstruct the Constitution, but also have it accepted in less than a year.”
 
The important changes include, amongst others:

  • Candidates no longer stand on behalf of parties in the elections, but as independent candidates for 10 predetermined portfolios for which students can vote directly;
  • Students also directly vote for a President and a Vice-President;
  • Nine (9) SRC members serve ex-officio as SRC members by virtue of being chairpersons of nine additional student councils established by the Constitution. Amongst others, the councils include a postgraduate student council, an international student council, a student media council and a student academic affairs council;
  • More stringent eligibility requirements are set for candidates, namely that students who wish to run in the elections has to, amongst others, sustain an academic average of more than 60%, and hold proven student leadership experience (which could be verified by the Independent Electoral Agency).

 
“With the SRC elections, students have the opportunity to firmly entrench the changes in student governance on which they have decided on by  themselves firmly, as a sustainable model for democracy at our Bloemfontein Campus. It speaks volumes that the number of leadership positions for which candidates can make themselves available, in essence has been increased by the number of additional student sub-councils from 21 to 67, because it brings about much more direct representation for different students across the campus,” says Mr Buys.
 
“I firmly believe that the upcoming student council elections will be a success,” says Motholo. “I wish the students, who are prepared to sacrifice a year of their lives in service of the student community as a member of the SRC, all of the best.”
 
The Qwaqwa Campus’ election schedule shall be announced within the next week, as well as the date of the institution of the Central Student Council (CSC).

Media Release
26 July 2011
Issued by: Lacea Loader
Director: Strategic Communication
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: news@ufs.ac.za
 
 

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