Project to help solve the water crisis
But the drought gives us a chance to plan around limited resources
THREE Stellenbosch University (SU) students have embarked on a crowd-funding initiative in an effort to raise awareness on the sustainability of groundwater resources.
MSc student Jared van Rooyen and fellow BSc Honours students Yaa Agyare-Dwomoh and Zita Harilall aim to raise R200 000 for their research project.
The Know Your Water campaign will raise the funds needed to collect rainfall and groundwater samples across the country.
SU’s isotope geochemist and project leader, Dr Jodie Miller, said the aim of the project was to show how regularly groundwater gets recharged while also determining whether it is a renewable resource or not.
“With this project, we want to develop a model to map the distribution of renewable groundwater. With this information, we can avoid exploitation and rather use this important resource in a sustainable manner.
“The modelling of groundwater resources is not a new thing. But because South Africa is geologically very complex, we need more site-specific data to accurately model what is happening to our groundwater in different catchments.”
The team plans to use tritium (3H), the radioactive isotope of hydrogen, to determine when water that enters the groundwater system was last in contact with the atmosphere.
“The longer groundwater is isolated from the atmosphere, the lower the tritium concentration. By knowing the concentration of tritium in rainfall and the concentration in a groundwater reservoir, we can predict how regularly the water is being recharged,” she said.
Van Rooyen said he was excited about the opportunity to participate in solving the country’s water crisis. The team leaves for its three-week fact-finding mission on March 19.
IT BEGINS with a desperate search by private individuals for alternative water sources: investment in boreholes and well points, and the abstraction of surface water from rivers and springs nearby; investments in rainwater, storage tanks and in a range of water recycling devices; a sudden surge in water consumption as residents stock up with bottled water; and domestic gardens are abandoned and become increasingly covered by hardened surfaces, resulting in elevated urban temperatures.
Those who can afford to will invest in shielding themselves from the threat of being without water.
Meanwhile, the local authorities are equally desperate to contain the situation by keeping the water flowing, reducing water pressure and avoiding water shedding.
Long-term water infrastructure projects are hastily moved forward in an attempt to provide rapid short-term solutions; the cost of water increases; regulations are enforced; and fines are issued to meet some of the shortfall of water service costs.
Desperate attempts are made to contain the over-abstraction of groundwater. Water is trucked into neighbourhoods, especially in poor urban areas where people cannot afford to buy or store water for themselves.
The environmental signs are observed on a wider scale – and they are easy to spot. When groundwater is over-abstracted, the first signs are seen when tall trees whither, die and fall over, and when lakes and rivers cease to flow.
Levels of dust particles are raised and lower atmospheric temperatures are elevated too. Surface water quality deteriorates with the increased concentration of contaminants in confined water bodies.
The impact on human health becomes increasingly evident.
The absence of clean drinking water and water for body washing results in dehydration, diarrhoea and related illnesses, and skin sores and malnutrition.
The economic impact becomes widespread. Businesses, jobs and the wellbeing of the workers are at risk. Farmers can no longer maintain the land productively, so many are bankrupted and forced to migrate to the cities.
Places of work are severely disrupted by absenteeism as a result of illnesses and the avoidance of unpleasant sanitary conditions, and productivity is reduced. The attendance at schools, colleges and universities is greatly reduced, assuming that these institutions are still capable of keeping their doors open.
Social tensions arise across the city. There is heightened anger and impatience, coupled with a general assault on the authorities that are responsible for the state of water services.
Intolerance leads to flashpoints that bring related tensions to the fore, not only those that are spurred by the lack of water resources.
Then, recovery and a period of celebration as the rains begin to fall.
Through the ages, and in contemporary times too, what follows is a brief period of gratitude.
These are the lessons from Brisbane, Sydney and Adelaide following the millennium drought.
In the case of Brisbane, what followed was a period of intense rainfall and floods in 2011.
New plans are then mounted involving costly investments. If done correctly, these then lead to improved conditions that offer cities a major breakthrough in building better coping mechanisms to deal with climate change and in building more water-sensitive cities.
The crisis can be positive if it is used as an opportunity to realign the city to live within the limits and thresholds of its water resources.
The next four months are critical. We are unlikely to reach the extreme scenario as described. We will squeak through the drought provided there is a collective and concerted effort to conserve water.
The winter rains are coming, but forecasting in a period of uncertainty is exactly that; it is uncertain.
While attention is on the present crisis, it is an important moment to plan for the next challenge of dealing with the likelihood of insufficient water resources by April and May 2018.
The clarion call is to adapt to a changing climate, to reduce water demand, and to embrace a sustainable approach to meet the socio-economic and environmental water needs of the city.
At the same time, level heads are required in the present crisis to resist an urge to invest in water infrastructure that will make water too expensive to share and unaffordable for the majority of citizens.