Anton:

That would be a dam filled by borehole or mountain runoff or, when we were still getting Irrigation Scheme raw water, from there.   Municipal water does NOT go into a dam from where people then draw!

The 350,000 people employed in the wine industry might disagree whether the industry should be sacrificed at the altar of Cape Town rates & taxes growth and its apparent inability to manage their water use.   All the farms I know are using a fraction of their legal rights and what their usage was before drip irrigation and better science and they spent fortunes implementing such systems.   Cape Town was plainly negligent.

By way of example of responsible management : the new large residential estates in the valley had to put in their own sewer treatment and non-potable reticulation for gardens ten years before CPT was irrigating its leafy gardens with our water and dumping its sewer in the ocean.

Yes, we are annoyed.   Telling us to suck it up does not help your water future