License article

Flood threat looms large in city's west

A ONE-IN-1000 flood around the Hawkesbury-Nepean would put 43,000 residents at risk, affect 14,000 homes and cause $8 billion worth of damage, a group of 10 western Sydney councils has warned.

Such a flood, statistically similar to the one that occurred in Queensland early last year, has a 0.1 per cent chance of occurring every year.

The Western Sydney Regional Organisation of Councils has renewed its calls for state and federal governments to urgently address threats of potential floods around the Hawkesbury-Nepean.

Even a repeat of the flood of 1867 would affect an estimated 7600 homes with about 1200 of those destroyed and cause damage worth up to $3 billion, the group said.

Prevention measures estimated to cost $500 million could include raising the wall of the Warragamba Dam, which overflowed in March.

Infrastructure NSW last month backed the implementation of Hawkesbury-Nepean flood plain mitigation measures as a key recommendation of its 20-year strategy, First Things First.

The organisation president, Tony Hadchiti from Liverpool, said the flooding was a serious concern.

A study showed 21,000 residential buildings stood on the flood plain - more than 5000 more than previously thought, and an extra 143 hectares of commercial and industrial property built since 1990, he said.