The peace of a normally tranquil suburban road near South Africa's capital, Pretoria, is being shattered by the sound of drilling. These are not prospectors looking for a new source of the country's mineral wealth, but workers digging for an arguably more precious resource: water. Private boreholes - like this one being excavated in Garsfontein - are springing up across the wealthier neighbourhoods in the country's economic heartland, where taps have been running dry. "I am tired of not knowing when we will have water and when we won't," the frustrated homeowner says. Having a borehole means we won't have...