Yarra River extraction for open space irrigation
DELWP, City of Melbourne, Royal Botanic Gardens Victoria
As a result of changes in land use in central Melbourne, City of Melbourne and Royal Botanic Gardens have the opportunity to take over licences to extract river water from the Yarra River which is in excess of the needs of the River. In a dense city environment where the delivery of alternative water schemes such as stormwater harvesting or recycled water supply for irrigation can be difficult, the utilisation of ‘end of catchment’ river water is a valuable possible addition to a water supply portfolio. Securing a fairly reliable alternative water supply could support liveability, sustainability and recreation aims of the Council and the Botanic Gardens.
E2Designlab and CMP were engaged to appraise options for the extraction, treatment and transfer of river water across the city, determining the most efficient scheme and providing a concept design and cost estimate. The extraction of freshwater upstream of Dights Falls required an extensive transfer network to the central city, where several routes were considered, including the reuse of abandoned infrastructure and co-delivery with planned infrastructure. Extraction of brackish water downstream of the Falls was also considered. A comprehensive cost-benefit analysis informed the selection of serviced demands and the selection of the transfer route which would offer the greatest flexibility for the future.
Water Sensitive City Outcomes:
- urban greening
- responsive design for climate
- alternative water supply