GREENING GOLF COURSES TO AVOID ALGAL BLUES
As one of the most polluted recreational waterways in NSW, Manly Lagoon suffers from nutrient overload. One of the major recomendations of the Manly Lagoon Estuary Management Study is to implement best environmental practices at the golf courses, bowling greens and myriad playing fields through the catchment.
The Manly Lagoon Estuary management Committeen has resolved that an environmental management strategy be designed for all four golf courses in the lagoon catchment - Balgowlah, Warringah, Manly and Wakehurst - in conjuction with the Australian Turfgrass Reasearch Institute, Council staff and the Manly Environment Centre.
A unique research project with environmental science students and staff of the University of NSW was set up on the environmental economics of the golf clubs and open space manangement in this catchment. The project involved promarily and investigation of the economic aspects of golf course management and the ecologically efficient use of a common resource by competing interests.
Manly Lagoon is a small coastal lagoon situated at the boundary of Warringah and manly councils in Sydney's Northern beaches. It has a catchment area of 18 ssquare kilometres. Inflows to the lagoon include Manly Creek, Burnt Bridge Creek and Brookvale Creek and additonally a large number of stormwater drains.
Sydney Water has 29 sewer overflows in the catchment, the greatest number for any waterway in their area of responsibility when considered in terms of waterway size.
The Manly Lagoon Estuary Management Study (1995) states: "The water of the lagoon is eutrophic (oxygen depleted) and sensitive to further increases in nutrient inputs ... Manly Lagoon sediment is contaminated with heavy metals and, compared with Sydney Harbour or Curl Curl Lagoon, has the highest average levels of copper and lead ... Indigenous vegetation is severley depleted... as such, any areas of remnant vegetation should be maintained and conserved as a valuable resource."
The Manly Lagoon Study indentified potential sources of pollution as being from a number of industrial estates, Warringah Mall shopping centre, residences and golf courses and playing fields. These sources are being addressed by various strategies; ie, Sydney Water has allocated approx $20 million to rehabilitate their infrastructure, and manly and Warringah councils are conduction education programs for residents and industry audits.