The threat of drought is expected to return to the South African city again next year and beyond

It is a plan as crazy as the situation is desperate — towing an iceberg from Antarctica to Cape Town to supply fresh water to a city in the grip of drought.

Earlier this year, Cape Town came within weeks of shutting off all its taps and forcing residents to queue for water rations at public standpipes.

The cut-off was narrowly averted as people scrambled to reduce their water usage and Autumn rains saved the day. But the threat is expected to return to the coastal South African city again next year and beyond.

Textile insulation

“The idea sounds crazy,” admits maverick salvage expert Nick Sloane, the brains behind the tow-an-iceberg scheme. “But if you look at the fine details, it is not so crazy.”

Mr. Sloane suggests wrapping the iceberg in a textile insulation skirt to stop it melting and using a supertanker and two tugboats to drag it 2,000 km towards Cape Town using prevailing ocean currents.

The iceberg, carefully selected by drones and radiography scans, would be about one kilometre in length, 500 metres across and up to 250 metres deep, with a flat, tabletop surface.

Melted water could be gathered each day using collection channels and a milling machine to create ice slurry — producing 150 million litres of usable water every day for a year.

Mr. Sloane’s idea might be dismissed as mere fantasy.

Up for the task

But the 56-year-old Zambian-South African has a reputation for taking on the impossible after he re-floated the giant Costa Concordia cruise ship that capsized in 2012 off the Tuscan island of Giglio, killing 32 people — one of the world's largest and most complex maritime salvage operations. “Icebergs are made of the purest freshwater on earth,” the founder of Sloane Marine Ltd said earnestly.

He estimates it would cost $100 million to haul an iceberg on a journey that could take up to three months, and another $50-60 million to harvest the water for one year as it melts. “In Russia, they have pushed (icebergs) away from oil installations — but small ones, they are about half-a-million tons. (Here) we are talking about 100 million tons,” said Mr. Sloane.

To tackle the drought, Cape Town has enacted measures ranging from building seawater desalination plants to issuing strict instructions to only flush toilets when necessary.

But whether Cape Town authorities will be persuaded to embrace the iceberg project is unclear. “At this stage it appears to us that in fact the groundwater or desalination options are cheaper or at least equal cost price,” said Cape Town's deputy mayor, Ian Neilson.

There are also questions on how the water from the iceberg will be channelled into the city's distribution system.

Another problem is that there is no guarantee that by the time the iceberg is hauled to Cape Town, it will still be able to produce the promised volumes of water.

Once there, the iceberg could be anchored in an old submarine channel, suggests Mr. Sloane.

As the iceberg melts, water will be collected each day, pumped into tankers and driven to Cape Town. “It won’t sort out Cape Town's crisis, (but) it will be about 20 to 30% of their annual needs,” said Mr. Sloane.

“The project is crazy — no question,” said Olav Orheim, a Norwegian glaciologist with four decades of experience on a similar project for Saudi Arabia.

As for Mr. Sloane, he is ready for the green light.