South Africa: Cape Town’s Day Zero horizon moves towards November

South Africa: Cape Town’s Day Zero horizon moves towards November

- in World News
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Residents in Cape Town will probably not see Day Zero this year if they continue to use 50 litres of water a day‚ but that puts the next Day Zero target in the middle of next summer.

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Deputy mayor Ian Neilson said on Thursday the current Day Zero projection‚ which is based on dam levels‚ was in mid-July — placing it in the middle of the rainy season.

Rainfall patterns over the past two years had become extremely unpredictable‚ and models assumed 2017’s well-below-average rainfall as the “new normal”‚ he said.

“Regardless of rainfall or water supply augmentation‚ Cape Town needs to continue striving to reduce average daily consumption to 450 million litres a day.

“This must be done not only to stretch our supplies as far as possible‚ but also because the national Department of Water and Sanitation has imposed a 45% restriction on the city’s water use for the current hydrological year (November 1‚ 2017 to October 31‚ 2018)‚” said Neilson.

“If we do not adhere to this restriction‚ there is a chance that the national department may impose even more stringent restrictions on Cape Town in November 2018.”

Neilson said consumption over the past week averaged 516 million litres a day and that dam levels dropped by 0.4 percentage points to 24%.

“Our latest Day Zero projections take into account the continuing drop in urban consumption over the past weeks‚ the Groenland water transfer‚ and the discontinuation of the agricultural releases for this hydrological year‚” said Neilson.

Neilson said consumption over the past week averaged 516 million litres a day and that dam levels dropped by 0.4 percentage points to 24%.

“Our latest Day Zero projections take into account the continuing drop in urban consumption over the past weeks‚ the Groenland water transfer‚ and the discontinuation of the agricultural releases for this hydrological year‚” said Neilson.

The city’s water consumption has dropped from an average of 1 200 million litres a day in 2015 to 500 million litres a day this year‚ a drop Neilson ascribed to water management and saving efforts by residents and industries.

“Of course‚ the one factor we are still unable to predict is the rainfall expected this winter. We have therefore drafted three different scenarios for Day Zero‚ based on no rainfall‚ rainfall at 100% and rainfall at 85% of the rainfall received in 2017‚” said Neilson.

Council projections tracked two graphs: one where consumption was at its target level of 450 million litres a day and the second pegging daily consumption at 600 million litres.

They also considered the impact of augmentation programmes‚ including desalination and aquifer extraction‚ which are expected to add 180 million litres of water a day once all programmes are fully implemented.

Neilson told TimesLIVE the spectre of Day Zero had made the City of Cape Town the most water resilient city in South Africa.

“We have to progressively over time build up our alternative supply to make sure we can cope. In the end we can’t just have enough to get through a disaster‚ we need to have more than that‚ we need to rebuild to a position where there is sufficient water for economic growth and the quality of life‚” he said.

“In South Africa we are already the lowest per capita users of all the metros in the country. Already before this drought we were already sitting at 200 litres of water per person per day‚ where Joburg is sitting with 250 to 300.”

Mayoral committee member for safety and security JP Smith said planning for the crisis had also helped the city to plan for other natural disasters which might befall the city‚ such as a hurricane or an earthquake.

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