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Media Release
28 March 2007
Drip irrigation keeping trees alive
Yarra residents may have noticed snake-like lines of luscious green grass in the city’s parks in the past few months – this is the result of Council’s sub-surface drip irrigation system that is keeping precious trees alive.
The drip irrigation system uses less water than above-ground sprinklers and is managing to preserve well-established trees that have been struggling in the drought conditions
In early January Yarra’s Open Space department began installing drip irrigation systems into all predominant parks and avenues of trees, where the survival of the trees has been reliant on irrigation in the past (Edinburgh Gardens, Canning and Drummond Street). To date over 30km of sub-surface dripper irrigation has been installed.
Yarra City Councillor, Kathleen Maltzahn said the sub-surface drip irrigation was an effective way of both using less water, and preserving the city’s trees.
“Dripper systems are a very efficient method of irrigation that supplies water directly to where it is required, the root system. Because the system is buried it prevents water loss from run-off, evaporation and spray drift,” she said.
“On average a mature tree can usually survive on 500ltrs of water per week. This will not keep it in pristine condition but will keep it alive throughout the drought.
“In one hour, 100 metres of drip irrigation tubing delivers approximately 54 litres of water to the root zone. By comparison, 100 metres of an above ground sprinkler line, which has 12 sprinkle heads, would use around 32,400 litres of water per hour!
“At present you can see where some of the drip irrigation lines have been installed by the green grass curves and lines through our parks and road medians.
“This is just one of many innovative initiatives that have been put in place to try and protect Yarra’s trees and reduce our water use.”
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