Ignorant or indifferent practices of the past have left many present day Councils with the problem of redressing the consequences. Warringah is no exception but has found this challenge an impetus to some interesting and creative solutions.
Following community concern about degradation of the Greendale Creek and Curl Curl Lagoon, in 1992 a Rehabilitation Study was commissioned by Council. Pressure on the Creek and Lagoon environments is the result of an unfortunately placed old landfill site and the nearby Brookvale Industrial Estate. Leachate from the landfill and run off from the Industrial Estate have combined to turn the waterways into a toxic mix of weeds, pollutants and sediment.
The Rehabilitation Study recommended various infrastructure work and education programs. A Catchment Liaison Officer was appointed to undertake an audit of activities on the Industrial Estate, and ascertain what practices might be modified or changed to prevent further problems.
Four stages of infrastructure work, the first of which was recently completed, make up the Plan. In Stage One, Council has built a Gross Pollutant Trap on the Greendale Creek. Designed to fit with the natural environment, it captures rubbish and coarse sediments. Around the trap, sandstone and coloured concrete together with native plantings enhance its aesthetic aspect.
Interpretive signage about the role the trap plays provides community education. Local school students are involved in the project via a streamwatch program where they carry out regular water testing. Local environment group, the Curl Curl Lagoon Committee, was actively involved in preparing the Plan.
“Many hours of work are put in by these volunteers, working closely with Council staff,” said Daniel Lovett, Environment Officer. “They are invaluable in carrying out clean ups, undertaking bush regeneration and acting as stewards of the area.”
During Stage Two, the creek environment will be rehabilitated with weed removal, landscaping and selective widening and deepening to improve water flow and the Creek’s natural ability to filter water. Artificial rocks designed to blend with the natural environment will be incorporated into the Park Street Weir and Pond. Further works at this site will enhance water pollution controls in the third stage of the infrastructure works.
Finally, the Lagoon itself will be dredged, with extracted sediments used to reprofile dunes. Undredged areas will create islands to attract birdlife at times of Lagoon break out. Mini wetlands will further improve the water quality and encourage wildlife. Construction of board walks, cycle paths, and picnic tables will enable local residents and visitors to make full use of the enhancement works.
Throughout this $5.5 million project, to be completed in 2001, regular newsletters, contact with volunteer community groups and educational campaigns reinforce Council and the community’s will to reclaim this valuable asset.
For further information contact Daniel Lovett, telephone (02) 9982 0333.
