The figures are clear: Climate change is here to stay. The Cape area WILL be facing ever-increasing reduction in rainfall over the next few decades. So it's no use relying on aquifers or boreholes, because these ultimately rely on rainfall. No rainfall, no borehole or spring water.
Instead, action needs to be taken NOW, just as Melbourne has done. The Cape has an inexhaustible supply of seawater, plus wind and sunshine. So the time to invest in large-scale desalination is NOW - not in 5 years' time when the city is in crisis.
Using PV and wind power will greatly reduce the cost of producing potable water. But it won't happen if the national and provincial government along with private enterprise are lulled into complacency.
The message is simple: Follow Australia's lead - and you will retain property values into the future. And retain Cape Town as a viable destination. Sleep - and you will be in utter crisis in years to come.