March 15, 2018, by Leonie Joubert
Cape Town’s reservoirs are expected to run dry by July. Image: By magemu, via Wikimedia Commons
With Cape Town’s water crisis so bad that its taps may soon run dry, Capetonians are working together to avert a shared disaster.
CAPE TOWN, 15 March, 2018 – The people of this city are preparing for Day Zero – a water shortage expected four months from now as Cape Town’s water crisis intensifies, likely to be so severe that the reservoirs will be virtually empty.
It sounds like a grim prospect. If it happens, it probably will be. But the good news is that across the city, regardless of differences of wealth and class, South Africans are working together to try to ensure that Day Zero never dawns.
São Paulo, Melbourne and Cape Town are three cities with one thing in common: they’ve all recently faced critical water shortages. Swelling populations, water infrastructure upgrades that aren’t keeping pace, and severe drought are on a collision course to become an urban manager’s worst nightmare, with fresh water and sanitation systems threatening to run dry – literally.
As climate change continues to ratchet up around the world, making rain patterns less predictable, and heatwaves and droughts harsher and stronger, many more cities will face similar intersecting challenges in future.
But a study of water use behaviour amongst Cape Town residents over the past three years shows surprising levels of co-operation around efforts to conserve the city’s “common pool resource”, its municipal water reserves. And the story is one which belies the media reports that people are selfishly panic-hoarding ahead of the prospect of the water being turned off to most of the city.
This February, Cape Town announced the possible arrival of Day Zero, an emergency response measure that the city says it will put in place, should the dams run down to their last remaining 13.5% of available water.
To conserve the dams’ final dregs, the city says it will shut off water to homes and businesses, and trickle-feed the remaining reserves through to critical services like hospitals. Residents will have to queue at communal water distribution points around the city to get a daily ration of 25 litres of water.
Media reports immediately said residents of the city appeared to be panic-buying bottled water and installing bulk water storage tanks.
The concern was that those who had the means to install these tanks would fill them from the municipal water system, to stock up ahead of Day Zero. This would mean vastly exceeding their current daily ration of 50 litres of water per person per day, and would result in a hefty fine or higher water bills.
But a recent analysis by a behavioural economist at the University of Cape Town (UCT) shows that Capetonians’ behaviour has actually been the opposite: that they have been pulling together in the past few years, in response to various measures by the city to get people to reduce their water use.
Martine Visser, from UCT’s Environmental Policy Research Unit, has been tracking water use behaviour amongst Cape Town’s residents, to see how effective various measures by the city have been in getting people to change their behaviour: media education campaigns, dramatic tariff increases, daily limit restrictions and fines for those who break the restrictions – and a few more.
Looking at 400,000 homes across the city, Visser and her colleagues saw an overall decrease in household water use of nearly 50% in just three years, dropping from 540 litres per household per day in January 2015 to 280 litres in January 2018.
“The worst possible outcome right now would be if people lost faith in each other’s ability to safeguard the remaining water”
It took drought-crippled Melbourne a decade to reduce residential water use by 40% from 2000 to 2010 during Australia’s “millennium drought”. In California similar water behaviour measures resulted in a per person reduction of 63% – from 1995 to 2016.
Most interesting in the analysis, says Visser, is the fact that wealthier Capetonians are doing their bit. Since the height of summer 2015 the richest households have cut their water use to that of the lowest income households, who have much less scope to reduce their water consumption further.
This dramatic drop is partly explained by the fact that wealthier families can in fact afford to invest in drilling boreholes or wells and installing bulk water storage tanks, which have helped reduce demand on the municipal supply. But it is also a consequence of sharp water reduction efforts by individuals.
Together, this has helped push back the arrival of Day Zero until early July. Hopefully, by then, the winter rains will have returned and begun recharging dams and groundwater.
So behavioural economics suggests that if people believe they are rallying around a common good, like saving water, they become more committed to doing it. But there’s a warning too, says Professor Visser: if people lose faith in each other they will turn to selfish, hoarding behaviour. There is evidence to suggest this twin pattern may apply not only with water-saving but in the case of other shared resources as well.
“The blame game that has dominated media forums is largely inaccurate and counter-productive, and it perpetuates free-riding and selfish behaviour which threatens this common resource pool”, warned Visser recently in the local press.
“The worst possible outcome right now would be if people lost faith in each other’s ability to safeguard the remaining water as part of a common pool resource, and instead rather started withdrawing water from the municipal supply for their own bulk storage.”
The message for drought-stressed cities in future, in terms of encouraging residents to willingly adopt more sustainable behaviour, is to rally them around a common cause, and build mutual trust by showing that people are cooperating towards everyone’s shared wellbeing. – Climate News Network
Leonie Joubert is a freelance science writer and author, whose books include Scorched: South Africa’s changing climate, and Boiling Point: people in a changing climate.