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City West Water

Rainwater and stormwater harvesting

Rainwater harvesting is a great way to save precious drinking water and reduce your water bill.

Harvested rainwater can be used in place of drinking water in many different functional areas across your business including toilets, gardens, fire testing, cooling towers and manufacturing.

This section contains some case studies from businesses that have used rainwater harvesting to save water and meet their waterMAP requirements.

Case study - Rainwater Harvesting At Cadbury Schweppes

Objective: To reduce reliance on potable water used in cooling towers and amenities.

How savings were achieved: Installation of a rain water harvesting system to supply cooling towers,
toilets and gardens with rain water.

Technology used: Rain water harvesting system.

Water volume saving: Estimated 7.5 million liters of potable water per year.

At Tullamarine, on the outskirts of Melbourne, Cadbury Schweppes produces a range of carbonated and still beverages, juices and alcoholic ready to drink beverages, including their classic mixers, mineral waters and iconic lemonade in a process that uses most of the drinking water entering the site.

As part of their sustainable management approach, Cadbury Schweppes had been proactively seeking opportunities to reduce reliance on drinking water for non-product purposes. When a plan emerged to replace a stormwater drain, it became an opportunity to investigate capturing rain water from the roof for reuse.

After consultation with a representative of City West Water’s Cleaner Production team, the decision was made to integrate rainwater harvesting systems to collect water runoff from a section of warehouse roofspace totalling 16,350 square metres rather than simply replacing the stormwater drain. Installation commenced in September 2007 and concluded in early 2008.

City West Water provided consultative and co-funding support to Cadbury Schweppes throughout the project by monitoring key milestones and providing a $100,000 grant. The total cost of the project is $413,000 with a payback period of 13 years.

Case study - Moonee Valley on track for dam good water saving

Objective: To increase the volume of stormwater captured for track irrigation by harvesting all of the stormwater that flows through Club drainage networks and increasing the size of the dam in which it is stored.

How savings were achieved: Drain diversions, dam excavation and construction of a Gross Pollution Trap.

Technology used: Humeguard HG35 Gross Pollution Trap, weir gates, engineering surveys and machinery for construction and excavation.

Water volume saving: 60 million litres per year.

In 2008/09, Moonee Valley attracted attendances of more than 143,000 over its 31 race meetings, as well as hosting conferences, conventions, weddings and other non-race day functions. Many of the visitors to the racecourse travel from regional Victoria, interstate and overseas, particularly during the Spring Racing Carnival.

It is therefore a significant contributor to Melbourne’s vibrant economy. When the racecourse was reconstructed in 1993, a stormwater harvesting system was introduced which captured runoff from rooftops, hard surfaces and surrounding streets, running through two drainage systems under the racecourse. However, not all of this water could be captured for track irrigation, as the initial flows from rainfall had to act as a flushing mechanism to remove pollutants before the remainder of the flows would end up in an onsite storage dam. 

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