Storm in a teacup: City saves five million litres of drinking water

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by City of Sydney
23/02/2012

A $420,000 stormwater collection project at Alexandria Park and Oval will save five million litres of drinking water a year and reduce rubbish and pollution flowing into Botany Bay.

Lord Mayor Clover Moore said it was part of the City's strategy to preserve drinking water supplies by using recycled water where possible.

"Instead of irrigating the park and oval with precious drinking water, we will collect five million litres of stormwater every year - replacing 80 per cent of the park's water needs," the Lord Mayor said.

"Making better use of stormwater will help drought-proof our parks and safeguard our precious drinking-water supplies.

"It will also stop rubbish and pollutants flowing into Botany Bay."

Stormwater will be collected from streets on the northern side of Alexandria Park across to the Australian Technology Park, Eveleigh, which flows into a channel running south to Alexandria Canal and Botany Bay.

A diversion pipe will take five million litres of stormwater from the channel each year - the equivalent of two Olympic pools and enough to supply 30 householdsfor a year.

The stormwater will pass through a metal grille, removing rubbish, before being stored in a 150,000-litre tank underneath Alexandria Oval. Ultraviolet cleaning will kill microorganisms and the stormwater will go through a filtration system, before being used to irrigate the park and oval.

The Alexandria Park and Oval project is expected to begin in March and finish in September. It follows a similar stormwater project in Sydney Park last year, which is now collecting 50 million litres of stormwater per year.

The second stage of the Sydney Park project, starting this year, will see up to 850 million litres of stormwater, equivalent to 340 Olympic pools, recycled and used in the park, wetlands and potentially by nearby businesses.

The City will release a decentralised water master plan later this year to identify local alternatives to importing drinking water from Warragamba Dam. These include collecting and cleansing rainwater, stormwater and waste water to irrigate parks, supply commercial air conditioners and flush toilets.


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