Experts are concerned about where the massive volume of water pouring from Sydney's Warragamba Dam will go, as debate continues about the impact the flow will have.

The spill of water over the Warragamba Dam wall on Thursday morning should serve as an urgent warning: much of western Sydney would be devastated by flood if there was another major downpour now.

60 years ago, Premier Bob Heffron opened Sydney's Warragamba Dam. It had taken 12 years to build and was the biggest mass-gravity dam in the southern hemisphere.

Some say the Warragamba Dam wall needs to be raised to help prevent the devastating floods seen this week — but there is a cost upstream too.

The Warragamba Dam, which supplies 80 per cent of Sydney's drinking water, is at just 43.9 per cent capacity after only 0.1mm of rain fell in its 9,000sq km catchment in the past week.

Dominic Perrottet has asked the federal government to fund half of a $1.6 billion Warragamba dam wall project that would protect communities from flooding.

NSW Opposition Leader Chris Minns says Labor “do not support” raising the Warragamba Dam wall and condemned the government’s plan to double the population on Western Sydney flood plains.

Lowering the supply level at Warragamba Dam as the main answer to flood mitigation could see the state’s water network crumble in just four years if a drought hits, a new government report has ...

Warragamba Dam: $301.7m ‘e-flows’ upgrade to revive lower Hawkesbury-Nepean River Sydney’s main supplier of drinking water is set for a whopping $301.7m investment to improve the health of ...