Drilling on Cape flats aquifer starts
CAPE TOWN – The City of Cape Town drilled its first test borehole into the Cape Flats aquifer on Thursday, hoping that the earth’s natural underground reservoirs would provide an extra 80 million litres of water per day as dams dry up in a prolonged drought.
“This is the first in the history of the City of Cape Town that we’re going to drill for water and extract that water that’s been there for millions of years,” said Mayor Patricia De Lille during a site visit in Mitchells Plain on Thursday.
The City has a licence to extract 80 million litres of water from the Cape Flats Aquifer per day, 40 million from the Table Mountain Group Aquifer and 40 million from the Atlantis Aquifer.
The drilling, however, is just the first stage of possibly rescuing the city from “Day Zero” – when it has no more water to pump to its residents, businesses and visitors – it does not mean that the water is available immediately.
Water samples must be tested, and specialists will determine the extent of the treatment and purification it needs ahead of the installation of reticulation pipes that connect the water to the overhaul system. The team plans to drill at several preidentified sites to find the highest yielding points as quickly as possible.
The first drill site was based at the waste water treatment plant in Mitchells Plain. The team laid out piles of different coloured wet soil which had been extracted, to demonstrate the depths drilled so far.
In blazing heat, blue PVC pipes were joined to be sunk into the hole to start bringing water to the surface.
“I am excited,” said machine operator Elias Leshaba, taking cover from the treeless dune heat under a truck while the mayoral visit was underway.
“We drilled the whole night,” said Hydrogeologist Derek Whitfield of the small team tasked with saving the city from the drought.
De Lille believes aquifer extraction will bring bigger volumes of water into the city’s systems at a much reduced cost compared to other methods, such as desalination.