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In the event of an extreme flood, these erodible earth and clay walls or 'fuse plugs' built across the upstream opening of the auxiliary spillway will progressively wash away by the rising floodwaters. The auxiliary spillway would then divert excess floodwater around the dam. The 'flip bucket' at the downstream end of the auxiliary spillway manages the floodwaters entering the river at the point where they meet the flow from the central spillway. This minimises erosion of the riverbed and banks.

The auxiliary spillway operates only in the event of a flood with one chance in 750 of happening in any year. This is more than three and a half times less likely to occur than the record flood of 1867, which had one chance in 200.

Hi Alan from the Group A1-Unique Australia. Fine Photo L. I can,t understand why GEO does not except the photo. Very strange. Regards Ebi

The Warragamba Dam Visitors Centre. View from the road over the new spillway.

The boat ramp near Warragamba dam wall, with dam at 100% capacity.

Looking back at the Warragamba Dam lookout from the wall of the dam.

The Nepean River in flood at Bents Basin Reserve, March 2013.

Thanks Ebi. It isn't often I get the chance to see things from the passenger seat :)

Warragamba Dam reaches full capacity after recent heavy rain, and ovewrflows for the second time in 13 years, February 2013. Warragamba is the largest concrete dam in Australia, and holds 80% of Sydney's fresh water supply. View from the Spillway Lookout.

Hi Alanfrom the Group A1-Unique Australia *. Great scenery, have to visit the NSW sea sides. L*. Regards Ebi

Hi Alanfrom the Group A1-Unique Australia *. That must be a great spot to have lunch on the deck and watching life going onL*. Regards Ebi

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