Lucretia Way Detention Basin upgrade

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Consultation has concluded



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)

Tell your story

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. 

Thank you for your particpation

CLOSED: This discussion has concluded.
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    Fix it and leave it

    by AndyM, 6 months ago

    Restore the lake and leave it alone.

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    Water flow control and improved water quality

    by Courtney, 6 months ago

    Option 1 has some pros with dredging and planting native vegetation but if the existing spillway is retained exactly how it is, the water flow reaching the creek in Hallett Cove Conservation Park (HCCP) is still at too higher velocity. Erosion will continue and the creek will get carved out even further. The spillway needs to be modified so that the water slows down before travelling down the creek because at the moment the water freely flows through and gains momentum as it travels downstream. Otherwise, some of the water needs to be diverted out the side of the dam... Continue reading

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    Option 2 and please engage with Kaurna community

    by Jessdh, 6 months ago

    I have lived across from the creek for most of my 29 years and have always enjoyed the existing lake however would support option 2 to develop a wetland which would return the lake to a more natural habitat. Most importantly when and how has the council made targeted engagement with the Kaurna community? As the native title holders and traditional owners, targeted engagement with Kaurna is a must. I am a proud Kaurna woman and this area is of special cultural and spiritual significance to all Kaurna people, as part of the Tjilbruke dreaming. Furthermore Kaurna Elders have a... Continue reading

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    Option 1 - Retain the existing basin

    by Kels01 , 7 months ago

    The area is beautiful, leave it as it is.

    It is clear that the council does not want to retain the existing basin based off the imagery and wording used above. The photograph with the crane is attempting to influence public opinion, portraying the Lucretia Way Basin as an expensive eyesore. The reality is that it is a beautiful area.

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    Retain the existing basin

    by gillmac, 7 months ago

    It's such a beautiful area, it would be a shame to lose it. Clean it up and keep it maintained for future generations to enjoy.

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    Lucretia Way Basin.

    by Grumps, 7 months ago

    Hi , in my opinion, it seem like the council has made its mind up already reading the options.. Natural water course, easiest cheapest more convenient .

    I think it would be nicer to clean it up maybe dredge a little and leave it as is , you will always get drought conditions and the natural watercourse will dry and look very unpleasant at times as well . thanks for your time.. Alan White.

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    Option 3

    by JanRose5, 7 months ago

    I would like the third option to reinstate natural watercourse to its historic condition. A heritage solution as this will ensure the wildlife retain their home as it is.

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    Option 2

    by DarrylK, 7 months ago

    Let’s face it the Pond/Lake/Dam/Basin whatever you want to call it has done its job and is now end of life. As we all know the Lucretia Way Pond has been a centre piece in this area for all things good. It’s provided some locals with a view, some with a reason to walk the dog, a home for wildlife and some just to take in the serenity. However it’s time for change and good on the City of Marion for taking notice of the local residents’ concerns and enabling a platform for residents to vent their concerns and share... Continue reading

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    Option 1

    by Carmel, 7 months ago

    The scenery is beautiful, leave it as it is.

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    Retention Pond

    by Edith-May , 7 months ago

    Retention Pond

    Option 1 and an Option 4

    We are in agreement with people’s comments who are voting for the same options 1 and 4. We purchased this house with a retention pond view in the year 2000. (The retention pond has dried out once in that time and for most of the time at least a trickle was making its way over the spillway apron) We first moved to Hallett Cove in 1989 and our 11 year old son used to ride his push bike around here with his friends to go swimming, fishing and yabbying. At that time... Continue reading