Cape Town faces Day Zero: what happens when the city turns off the taps?
In 10 weeks engineers will turn off water for a million homes as this South African city reacts to one-in-384-year drought. The rich are digging boreholes, more are panic-buying bottled water, and the army is on standby
The head of Cape Towns disaster operations centre is drawing up a plan he hopes he never has to implement as this South African city on the frontline of climate change prepares to be the first in the world to turn off the water taps.
Weve identified four risks: water shortages, sanitation failures, disease outbreaks and anarchy due to competition for scarce resources, says Greg Pillay. We had to go back to the drawing board. We were prepared for disruption of supply, but not a no-water scenario. In my 40 years in emergency services, this is the biggest crisis.
The plan being drawn up with the emergency services, the military, epidemiologists and other health experts is geared towards Day Zero, the apocalyptically named point when water in the six-dam reservoir system falls to 13.5% of capacity.
At this critical level currently forecast for 16 April piped supply will be deemed to have failed and the city will dispatch teams of engineers to close the valves to about a million homes 75% of the city.
Its going to be terrifying for many people when they turn on the tap and nothing comes out, says Christine Colvin, freshwater manager for WWF and a member of the mayors advisory board.
In place of piped water, the city will establish 200 water collection points, scattered around the city to ensure the legally guaranteed minimum of 25 litres per person per day within 200 metres of every citizens home.
This will be a major burden on municipal coffers. The estimated cost of installing and running the new system for three months is 200m rand (12m). Instead of selling water, it will be given away for free, which will mean R1.4bn in lost revenue.
The total city budget is R40bn, so this wont destroy us, but it will cause severe discomfort, says the deputy mayor, Ian Neilson, who adds that he has not had a bath at home for a year. A bigger concern is to ensure the economy doesnt collapse. We need to keep business and jobs going Clearly, there could be a severe impact. It depends on how long it continues.
Neilson stresses that Day Zero can be avoided. A lowering of pipe pressure and a public information campaign to conserve water have cut the citys daily water consumption from 1,200 million litres to 540 million litres. If this can be pushed down another 25%, the taps should stay open to the start of the rainy season in May.
But this is no guarantee. Three consecutive years of drought have made a mockery of normal seasonal patterns.
Were in a critical transition period where the past is no longer an accurate guide to the future, says Colvin.
She illustrates her point with two maps. One based on historical data shows the water risk of Cape Town is green, meaning it is among the lowest in South Africa. The other based on future climate projections is almost the complete opposite, with the city located in a middle of an alarming red heat zone.
What we didnt know was when that future would arrive, says Colvin. Businesses and investors have heard the long-term projections but they havent heard the starting gun go off. If this drought can pull the trigger then that could be a good thing. If this is seen as a pressure test for the new normal, it will help us to adapt.
The government has struggled to keep pace. Plans to make the city more resilient to climate change by diversifying the water supply with boreholes and desalination plants were not due to kick in until after 2020. But the climate has moved faster, bringing a drought so severe it would usually be expected only once every 384 years.