SA is staring down the barrel of a water security crisis predicted decades ago – expert
Amid ongoing restrictions in Gauteng, experts have highlighted that water security in the whole of South Africa is under threat — a fact that has been known for the past two decades.
“We are staring down the barrel,” said Professor Anthony Turton, a water resource management specialist at the University of Free State, at a public engagement on 26 October with Joburg residents and water specialists about the ongoing water crisis in Gauteng. This is despite Rand Water CEO Sipho Mosai emphasising at a media briefing recently that there is more than enough water going into the system.
The City of Joburg and Rand Water have been at pains to say that the recent water shortages in parts of Gauteng were initially caused by power failures (not scheduled load shedding) at two of Rand Water’s purification plants in Vereeniging in late September and then exacerbated by scheduled rolling blackouts.
Simon Xaba, the general manager of operations at Rand Water, told the press: “It is my opinion that if you have this frequent load shedding, you are technically fiddling with the stability of power.”
But while power plays an integral role in getting water pumped into reservoirs, Turton emphasised that experts in the water sector had known for the last two decades that South Africa would face a water deficit in the future.
They predicted in 2002 that by 2025 South Africa would need 63 billion cubic metres to service demand for the country despite only having 38 billion cubic metres of water accessible in dams.
Turton, the former vice-chair of the research advisory panel for the National Water Resource Strategy (NWRS) at the CSIR, explained that the first NWRS — which was published in 2004, but the technical team had been workshopping the data since 2002 — is the most definitive study of the balance between water demand and supply South Africa has seen. At the time, the technical team quantified the country’s total water volume at 53 billion cubic metres.
The 2004 NWRS stated: “If we look forward to the year 2025, even if we factor in further infrastructure development, we find that several additional water management areas will most likely be in a situation of water deficit.”
Since then, independent peer-reviewed studies have used sophisticated mathematical modelling to revise SA’s total water volume from 53 billion cubic metres to 48 billion cubic metres. Turton explained that the number is lower in part because of climate change and the more sophisticated modelling system.
However, the accessible water in South Africa’s dams amounts to just 38 billion cubic metres.
This is because we can’t use water that is known in legal terms as the reserve. The reserve consists of two components: water in reserve needed for basic human needs, which is 25 litres per person per day that has to be left in the river if there is no piped water available in that area; and the ecological reserve, which is needed to sustain the ecological functionality of the ecosystem.
So, assuming that the dams are full and that no storage capacity has been lost to sediment, South Africa has access to 38 billion cubic metres of water. But we need 63 billion cubic metres of water to service demand by 2025.
Even in 2008, WWF South Africa warned that 98% of available water resources was already fully used and the country could run out of water by 2025.
“This doesn’t mean the taps will run dry, but that water-intensive industries won’t be able to continue working as before and there may be water rationing,” said the chief executive of WWF South Africa, Morné du Plessis, in a media briefing in 2008.
“What we’re saying about water today [in 2008] is what the energy people were saying to the government 10 years ago,” Du Plessis said.
What does running out of water actually mean?
We’ve technically already run out of water.
Even though dams are full right now — the Vaal Dam is at 92% capacity — we’ve run out of water that is allowed to be allocated.
“When we say we ran out of water, we mean we have run out of water to allocate, that the demand for the licences for that water exceeds the available supply,” explained Turton.
In 2002, the technical team working on the first NWRS said that 98% of the total volume available in SA’s 19 water management areas had already been allocated.
“We’ve given authorisations for water — for paper and pulp mills and oil refineries, etc — they’re all got their allocation of water, and then we’ve allocated more water than we have available,” said Turton.
He explained that the allocation, known as ELU (existing lawful use), goes to lawful users of water as defined by the National Water Act.
“The sum of those ELU allocations equalled 98% of the known supply, with some water management areas being over-allocated by 120%,” said Turton.
The first NWRS broke down SA’s water allocation to 62% for agricultural irrigation, 27% for domestic and urban requirements, 8% for mining, large industries and power generation, and 3% for commercial forestry plantations.
“The reason why the [Vaal] dam is full is because we’ve got to keep it for the years when we don’t have water — for the dry years,” explained Turton.
“We work on long-term averages and long-term trends. And the long-term trend was we ran out of water in 2002.”
As explained in the first NWRS, the “total water available includes the total local yield plus water transferred from elsewhere”.
Turton said technical specialists in the water sector had known about this for 20 years but had been ignored.
Government needs to step up
Dr Ferial Adam, manager of the civil action organisation WaterCAN, emphasised at the public meeting on 26 October that the problem lies in poor planning, failing infrastructure, underspending and sewage pollution.
According to the Department of Water and Sanitation’s 2022 Blue Drop Report, 52% of SA’s water supply systems are in the medium to critical risk groups, 60% don’t comply with microbiological standards and 77% don’t comply with chemical standards.
The 2022 Green Drop Report classified about 60% of SA’s wastewater treatment works as being in a “poor to critical” state, and only 23 out of 995 wastewater systems qualified for Green Drop certification.
At its recent media briefing, Rand Water emphasised that South Africa, and Gauteng specifically, has high water consumption rates compared with the rest of the world, and while imploring the media not to make it seem that it was blaming consumers, encouraged a culture of conservation.
Rand Water reported that water consumption in South Africa is 233 litres per capita per day, which is relatively high compared with the world average of 173 per capita per day.
And in Gauteng, 305 litres per capita per day is consumed during peak demand times.
However, Adam said Rand Water had failed to emphasise that this high consumption is because of extreme water losses — the last available Rand Water data indicates that 40% of water is lost due to leakages.
So, out of the 4 900 megalitres that Rand Water supplies every day, almost 2 000 megalitres are lost because of leaking pipes and ageing infrastructure.
Turton agreed that the consumption numbers Rand Water supplied were misleading — breaking down the numbers as such:
If Rand Water pumps 4.900-million litres to 17-million people, and 40% is lost to water leaks and 10% is allocated to commercial users, it’s actually 160 litres per person per day, which is below the global average and far below the estimated Gauteng consumption.
The 2019 National Water and Sanitation Master Plan reported that municipalities were losing about 1,660 million cubic metres of water per year.
As water costs R6 per cubic metre, this amounts to R9.9-billion lost annually.
Adam emphasised that only 46% of South Africans have a tap in their home and the government needs to step up, because we are “pumping water into an empty bucket”.
Turton said that even though it might seem that the situation is dire, there is a solution.
He emphasised that water is an infinitely renewable resource, and as a renewable source. “All we have to do is recycle our total national water resource 1.6 times, and then we won’t have a water crisis any more. In fact, we can then have full employment.”
We need to multiply the 38 billion cubic metres that are available in the dams by 1.6 to meet the upcoming demand of 63 billion cubic metres, which can be done by recycling the country’s total water resources.
However, to do that, we need policy certainty for the recovery, reuse and recycling of water — and at the moment we don’t have that policy.
Turton said that because we don’t have this policy, “we don’t have an enabling environment for capital and technology to come into the space”.
“If we had to have a policy that accepts that water is an infinitely renewable resource, we would see targets being set. And so, for example, if you were to set a target that over the next 20 years we have to recycle our water source 1.6 times, but you start off with a smaller target and then ramp up over time to this bigger target.”
Turton explained that at the moment all of our water is treated to South African National Standard (Sans) 241.
“Whether you flush your toilet with it, whether you wash your car with it, whether you cool down your industrial process plant with it, whether you irrigate your garden with it, whether you drink it, it’s all the same standard water.
“Now, that doesn’t make sense,” he said.
So, we need a policy change, which has to come from the government.
Turton added that we can recover water from sewage — SA produces five billion litres of sewage every day — and that water can be recovered, not as drinking water, but recycled back to non-drinking uses like cooling down boilers or irrigating public gardens.
Turton said we should also implement a “dual-stream reticulation economy”, which means having two pipes for every end user — one that supplies standardised drinking water and one that provides grey water.
“So, it will be safe to use, but it’s not drinking water. And that’s what you flush your toilet with, that’s what you want to water the garden with,” explained Turton.
Turton emphasised that all water supplied by entities like Rand Water or Umgeni Water is Sans 241 standard, but only 1% of that is for drinking.
Turton suggests that instead, we treat 1% to the highest standard, but then we treat the rest to a standard that is safe, but not necessarily a drinking standard.
“That’s the direction we should go in,” said Turton. “And, at the moment, there’s just no insight into this possibility by any government leader. They keep on following the same old pattern of just building another dam and just blaming the public.”
Article courtesy Daily MaverickView more