What is the role and function of the pond?

Council did not construct the pond, it was built by private developers in the early 70’s during the construction of Hallett Cove housing estate. Although no design drawings or specifications exist, its role is to prevent sediment entering the high value conservation park and to manage peak flows to minimise downstream erosion. The pond also provides some amenity and recreational value.

Q. Why did the pond dry last year?

A. The pond emptied due to several reasons. Council engaged an independent consultancy and Flinders University to fully understand the reasons and develop longer term sustainable solutions. The reports provided concluded that the recently constructed wetlands upstream, have no material effect on downstream flows. Evaporation exceeded inflows and inflows were low due to very low annual rainfall and due to a recent change in the way water was leaking through the creek floor into the underlying bedrock.

Q. What are the three options being considered for the longer term management of water?

A. The three options presented are as follows;

·  Retain the existing basin/pond with ongoing dredging (circa every 20-25 years)

·  Re-engineer the basin to create an offline wetland (as recommended in the Stormwater Management Plan, which assessed the holistic management of the entire catchment).

·  Reinstate Waterfall Creek to its natural condition

Q. How are the three options, currently under consideration being assessed?

A. A multiple criteria analysis was undertaken by an independent consultancy, with consideration to social, environmental and economic factors.

Q. Which option is recommended and why?

A. The wetland option has been recommended because of the high score for visual amenity, semi-permanent waterbody, educational and recreational opportunities. The wetland scores highest for ecological benefits, providing the greatest water quality improvement, increases in biodiversity and the potential for stormwater harvesting. From an economic perspective, the wetland had the highest whole of life costs.


Why did the pond dry last year?

The pond emptied due to several reasons. Council engaged an independent consultancy and Flinders University to fully understand the reasons and develop longer term sustainable solutions. The reports provided concluded that the recently constructed wetlands upstream, have no material effect on downstream flows. Evaporation exceeded inflows and inflows were low due to very low annual rainfall and due to a recent change in the way water was leaking through the creek floor into the underlying bedrock.

Q. What are the three options being considered for the longer term management of water?

A. The three options presented are as follows;

· Retain the existing basin/pond with ongoing dredging (circa every 20-25 years)

· Re-engineer the basin to create an offline wetland (as recommended in the Stormwater Management Plan, which assessed the holistic management of the entire catchment).

· Reinstate Waterfall Creek to its natural condition

Q. How are the three options, currently under consideration being assessed?

A. A multiple criteria analysis was undertaken by an independent consultancy, with consideration to social, environmental and economic factors.

Q. Which option is recommended and why?

A. The wetland option has been recommended because of the high score for visual amenity, semi-permanent waterbody, educational and recreational opportunities. The wetland scores highest for ecological benefits, providing the greatest water quality improvement, increases in biodiversity and the potential for stormwater harvesting. From an economic perspective, the wetland had the highest whole of life costs.

What are the three options being considered for the longer term management of water?

The three options presented are as follows;

· Retain the existing basin/pond with ongoing dredging (circa every 20-25 years)

· Re-engineer the basin to create an offline wetland (as recommended in the Stormwater Management Plan, which assessed the holistic management of the entire catchment).

· Reinstate Waterfall Creek to its natural condition

How are the three options, currently under consideration being assessed?

A multiple criteria analysis was undertaken by an independent consultancy, with consideration to social, environmental and economic factors.

Which option is recommended and why?

The wetland option has been recommended because of the high score for visual amenity, semi-permanent waterbody, educational and recreational opportunities. The wetland scores highest for ecological benefits, providing the greatest water quality improvement, increases in biodiversity and the potential for stormwater harvesting. From an economic perspective, the wetland had the highest whole of life costs.