Lucretia Way Detention Basin upgrade



Due to a change in Council agenda the consultation will be extended until 21 November.

The City of Marion engaged specialist consultants Tonkin, to investigate the specific reasons why Lucretia Way Basin at Hallett Cove dried up earlier this year. The water in the detention basin all but evaporated last summer. The review included additional modelling of the basin and upstream catchment. The review concluded that the recently constructed wetlands within the Glade Crescent Reserve had no material adverse impact on downstream flows, validating the original environmental impact assessment for the wetlands.


As part of the ongoing engagement with the Community, which has previously included gathering residents’ concerns and feedback, we now want to inform you of three long-term options for the basin for consideration and gather your comments on what you think to include in our recommendations to Council later in the year, alongside the report being developed by Tonkin. We will also take in to account the findings from the Hallett Cove Creeks Stormwater Management Plan.

The three options are:

1. Retain the existing basin

The existing basin could be retained with minor works including regular dredging, earthworks to improve the stability of the banks, removal of weeds and exotic species and planting of native vegetation. The basin may still dry out when there is little rain, and will be a cost for ongoing dredging. The existing values will be retained.

2. Offline wetland

Consistent with the recommendations of the Stormwater Management Plan, the basin would be re-engineered to provide a wetland to treat low flows. Higher flows will bypass the wetland and continue down the creek. Design would include deeper pools of open water and shallow reeded pools. There would be provision for controlled release of water to supply environmental flows supporting growth of bankside vegetation in the downstream reach. A wetland will provide improved water quality treatment, but may dry out over summer. A wetland provides habitat and shelter for a wide range of native plants and animals.

3. Reinstate natural watercourse

The basin could be filled soil and works undertaken to restore the creek bed to near-natural conditions. Works will include weed removal, erosion protection and planting of native species. The existing spillway may be retained to provide energy dissipation.
This option would result in the loss of the amenity associated with a semi-permanent waterbody.

To have your say on these options you can either:

  • Fill out your comments in the discussion forum below. These comments will be recorded and used in supporting our recommendations to Council. Or;
  • Attend a public meeting on 31 October, 7.00pm at Hallet Cove Library. Here you will have an opportunity to hear more about the options and provide your feedback. Feedback collected at the meeting will be combined with feedback collected on Making Marion.

Once we have developed our final report the recommendations will be presented to Council in late 2019. The final report for consultation will contain:

  • Modelling to understand why the basin dried out.
  • Concept design and costing for each option.
  • Multi-criteria analysis to compare financial, environmental and social factors of the 3 options.
  • Feedback from the current consultation.
  • A recommendation to Council on the preferred option, with whole of life costings.

For more information, please contact:

Glynn Ricketts - Water Resources Coordinator.

Email: Glynn.Ricketts@marion.sa.gov.au(External link)



Due to a change in Council agenda the consultation will be extended until 21 November.

The City of Marion engaged specialist consultants Tonkin, to investigate the specific reasons why Lucretia Way Basin at Hallett Cove dried up earlier this year. The water in the detention basin all but evaporated last summer. The review included additional modelling of the basin and upstream catchment. The review concluded that the recently constructed wetlands within the Glade Crescent Reserve had no material adverse impact on downstream flows, validating the original environmental impact assessment for the wetlands.


As part of the ongoing engagement with the Community, which has previously included gathering residents’ concerns and feedback, we now want to inform you of three long-term options for the basin for consideration and gather your comments on what you think to include in our recommendations to Council later in the year, alongside the report being developed by Tonkin. We will also take in to account the findings from the Hallett Cove Creeks Stormwater Management Plan.

The three options are:

1. Retain the existing basin

The existing basin could be retained with minor works including regular dredging, earthworks to improve the stability of the banks, removal of weeds and exotic species and planting of native vegetation. The basin may still dry out when there is little rain, and will be a cost for ongoing dredging. The existing values will be retained.

2. Offline wetland

Consistent with the recommendations of the Stormwater Management Plan, the basin would be re-engineered to provide a wetland to treat low flows. Higher flows will bypass the wetland and continue down the creek. Design would include deeper pools of open water and shallow reeded pools. There would be provision for controlled release of water to supply environmental flows supporting growth of bankside vegetation in the downstream reach. A wetland will provide improved water quality treatment, but may dry out over summer. A wetland provides habitat and shelter for a wide range of native plants and animals.

3. Reinstate natural watercourse

The basin could be filled soil and works undertaken to restore the creek bed to near-natural conditions. Works will include weed removal, erosion protection and planting of native species. The existing spillway may be retained to provide energy dissipation.
This option would result in the loss of the amenity associated with a semi-permanent waterbody.

To have your say on these options you can either:

  • Fill out your comments in the discussion forum below. These comments will be recorded and used in supporting our recommendations to Council. Or;
  • Attend a public meeting on 31 October, 7.00pm at Hallet Cove Library. Here you will have an opportunity to hear more about the options and provide your feedback. Feedback collected at the meeting will be combined with feedback collected on Making Marion.

Once we have developed our final report the recommendations will be presented to Council in late 2019. The final report for consultation will contain:

  • Modelling to understand why the basin dried out.
  • Concept design and costing for each option.
  • Multi-criteria analysis to compare financial, environmental and social factors of the 3 options.
  • Feedback from the current consultation.
  • A recommendation to Council on the preferred option, with whole of life costings.

For more information, please contact:

Glynn Ricketts - Water Resources Coordinator.

Email: Glynn.Ricketts@marion.sa.gov.au(External link)

Please tell us which of the three options we have presented above you prefer and why? Use the headline for your post to state your favoured option and then use the text box to highlight why that option and not others. 

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