Is the proposal to raise Warragamba Dam wall to increase Sydney's drinking water storage?
No. While Warragamba Dam is only used for drinking water supply at present, the proposal is that an additional 14 metres be added to the dam wall to capture flood waters during high rainfall events. During high rainfall events, it is proposed the additional 14 metres of airspace in the dam hold back floodwaters for five weeks at a time. After a flood event, the dam would be slowly emptied to bring the dam level back to its 'full drinking supply storage level'.