Drive to find water supply

Despite recent rain, the City of Cape Town is increasing its efforts to secure new sources of temporary water supplies in the midst of the worst drought in 100 years, mayor Patricia de Lille, pictured, said yesterday.

The council resolved last month to take a new water-resilience approach to water management in the city.

“Being resilient in an urban environment means that we have the capacity as individuals, communities, institutions, businesses, and systems within a city to survive, adapt, and grow, no matter what kind of acute stresses and shocks we experience,” she said.

In this regard, council supported the creation of a water resilience task team under the leadership of the chief resilience officer, which had set about augmenting the city’s response to drought, ensuring that acute water shortages were avoided, and transforming Cape Town’s water landscape into one that ultimately relied less on surface water.

“Notwithstanding recent rains, the city is upscaling its efforts to secure new sources of temporary water supplies. We cannot bank on there being sufficient rain in the remainder of winter to break the drought. It will take at least three consecutive winters of above-average rainfall to make a real difference to the availability of surface water,” De Lille said.

Today, the city will formally post a request for ideas/information to the market for proposed solutions that would enable the city to temporarily establish several small, intermediate and possibly even large plants to supply potable water.

It was contemplated that these plants could use reverse osmosis, desalination or similar technology from sea water, other surface water sources or treated run-off. The city was looking for solutions that could produce between 100 million litres and 500 million litres of potable water per day.

The city sought to gauge the interest of for-profit and nonprofit entities in forming possible partnerships with the city to supply, install, and operate temporary plants at various locations along the sea shore and at certain inland locations, for the injection of potable water – the standards of which were defined by SANS 241 of 2011 – into the city’s water distribution network.

It was envisaged that the first plants would be available for production towards the end of August. The city would require these plants to be operational for at least six months, she said. –