Brown Hill Creek Stormwater Management
Green Light to Finalise Flood Plan
The proposed stormwater management plan to mitigate flood risks across the Brown Hill Keswick Creek catchment will now be finalised for approval by South Australia’s Stormwater Management Authority following unanimous agreement of the plan amongst the project’s five catchment councils.
The Brown Hill Keswick Creek Stormwater Project – which is a collaboration between Adelaide, Burnside, Mitcham, Unley and West Torrens councils – now looks forward to working with the State Government and the Stormwater Management Authority to progress the implementation of all the proposed flood mitigation works.
Full implementation of the plan is subject to approval from the Stormwater Management Authority and funding assistance from the State and Federal Governments.
The Brown Hill Keswick Creek Stormwater Project has released the results of a six-week community consultation process regarding proposed flood mitigation works for upper Brown Hill Creek (Part B works).
This report was originally issued on 12 August 2015 and has now been re-issued with the following minor amendments:
The report was re-issued on 7 September 2015 with the following changes:
- A note regarding the separate Appendices Report (dated July 2015) has been added to the Contents (page ii)
- A clerical error in Figure 2 (pages 7 and 43) regarding the percentage of ‘All creek property owners’ respondents who selected ‘unsure’
- A clerical error in the first sentence on page 43 to include reference to Table 3-15
- An explanatory note has been added following Table 3-15 (page 45) to clarify why Table 3-15 refers to 87 respondents compared to 88 respondents in Table 3-14
- A clerical error in Figure 5 (pages 9 and 50) and accompanying Table 3-18 (page 51) has been corrected replacing ‘A1’ with ‘A2’ (as explained in the body of the report in the first dot point on page 50)
The community consultation process ran from May 13 to June 23 and attracted 818 public respondents, with 696 of these respondents (85%) indicating their support for the project’s preferred Option D, which includes upgrading the capacity of upper Brown Hill Creek at critical sections. Among respondents who own creek properties likely to be impacted, support for Option D was evenly divided.
The full community consultation report can be viewed at www.bhkcstormwater.com.au.
Once all five catchment councils involved in the project (Adelaide, Burnside, Mitcham, Unley and West Torrens) have formally received the consultation report, they will determine their respective positions on proposed flood mitigation works for upper Brown Hill Creek.
Based on council decisions, a final recommendation on Part B works regarding upper Brown Hill Creek will then be made by the project to the State Government’s Stormwater Management Authority.
It is anticipated that a final recommendation will be made by October 2015.
Brown Hill Keswick Creek Stormwater Project Part B Report Released
On 9 September 2014, The Brown Hill Keswick Creek Stormwater Project released its Part B Report focusing on potential flood mitigation works for upper Brown Hill Creek.
Community consultation will be undertaken following upcoming council elections where residents will be given opportunities to discuss the report’s findings with project staff and provide feedback on proposed works. This is anticipated to commence in March 2015.
To read the Part B Report visit www.bhkcstormwater.com.au
Brown hill Keswick Creek Stormwater Management Project - Upper Brown hill Creek - Creek Owner Local Briefing - Mitcham Residents - Wednesday 9 April 2014 - Presentation
The Brown Hill and Keswick Creek catchment Council's Mitcham, Unley, West Torrens, Adelaide and Burnside have agreed to focus on a flood mitigation solution that involves clearing, cleaning and upgrading works in specific areas along Brown Hill Creek. The clearing, cleaning and upgrade works will form an option that will not require construction of bypass culverts or a stormwater detention dam in Brown Hill Creek.
As an initial step, a briefing session was held with affected creek owners with the aim of outlining basic details of the proposed works an gaining feedback from property owners.
A copy of the presentation is below.
Stormwater Management Plan Gets Green Light
The Stormwater Management Authority (SMA) has approved the 2012 Brown Hill Keswick Creek Stormwater Management Plan.
Stormwater Management Authority Presiding Member, Mr Stephen Hains said the decision was a significant milestone in delivering a flood mitigation strategy to protect the residents of the Brown Hill Creek and Keswick Creek catchment areas.
“This catchment is an area which is at significant risk of flood damage, in the event of a major storm,” Mr Hains said.
Mr Hains said the Stormwater Management Plan estimated that $147.6 million would be required to construct infrastructure within Brown Hill and Keswick Creeks catchment over the next ten years.
“This Stormwater Management Plan has been developed through the cooperation of the five catchment councils – the Cities of Unley, Mitcham, Burnside, West Torrens and Adelaide who have shown a strong commitment to finalising this plan,” Mr Hains said.
“By working together to deliver the required key infrastructure requirements, the Plan outlines the work necessary to protect 6,921 properties in the event of a 1 in 100 year flood.”
Mr Hains said the Stormwater Management Plan identified the agreed works the councils have committed to progress across the catchment area, subject to agreements on funding from the three levels of government.
“The plan also includes a commitment for further investigations of flood mitigation options in the upper reaches of Brown Hill Creek.,” Mr Hains said.
“These investigations will assess the options of either a flood control dam or bypass culverts as the preferred option.”
In support of the Stormwater Management Plan, the Stormwater Management Authority has also approved funding toward the following projects:
a contribution of up to $1,400,000 towards the Ridge Park Detention Basin construction.
a contribution of up to $2,500,000 towards the Goodwood Junction Brown Hill Creek Diversion Project
a contribution of $270,000 towards the Brown Hill Keswick Creek 2012 SMP
Stormwater Management Plan on Track for SMA Lodgement
Brown Hill and Keswick Creek - Channel Capacity Assessment
The Adelaide and Mount Lofty Ranges Natural Resources Management Board (AMLRNRMB) engaged consultant Australian Water Environments (AWE) to undertake a survey of the Brown Hill, Keswick, Parklands and Glen Osmond Creeks so that updated hydraulic capacities of the creek can be estimated.
A comprehensive survey of the four creeks and their channel capacities was last undertaken in 1983.
The updated survey and results will assist the five catchment Councils in the compilation of the revised “Brown Hill and Keswick Creeks Stormwater Management Plan”.
The “Brown Hill and Keswick Creeks Survey and Channel Capacity Assessment Report” has been supplied to the project team and the Cities of Unley, Burnside, Adelaide, West Torrens and Mitcham by the AMLRNRMB.
The Adelaide and Mount Lofty Ranges Natural Resources Management Board “Brown Hill and Keswick Creeks Survey and Channel Capacity Assessment Report” is available below.
Brown Hill Keswick Creek Stormwater Project - Bypass Culvert Feasibility Assessment (Hampton Street to Forestville Reserve)
In November 2011, engineering consultant WorleyParsons published the “Preliminary Assessment – Enhancement of Flood Mitigation Options” November 2011 report which identified several “No Dam” options for flood mitigation in Brown Hill Creek. These options involved additional/enhanced culverts.
In early 2012, WorleyParsons were again engaged to refine their initial work and confirm feasibility of alternative bypass culvert works in lieu of constructing a dam in Brown Hill Creek. The feasibility investigation and assessment included:
The ability to fit the bypass culverts along proposed roadways and between existing services (sewer, water, telecommunications, gas and underground electricity lines).
- The capacity to relocate services to accommodate the proposed bypass culverts.
- The costs associated with the alternative bypass culvert works including services relocations.
The findings of the feasibility assessment are documented in the following report.
Councils Approve Stormwater Management Strategy
A stormwater management strategy for the Brown Hill and Keswick Creek catchment has been approved by the five councils involved in the project.
Adelaide, Burnside, Mitcham, Unley and West Torrens Councils have all endorsed a strategy which calls for the commencement of the bulk of proposed flood mitigation works throughout the region, including construction of detention basins, creek diversions and channel upgrades across the catchment worth over $100 million.
The agreed strategy also commits to further investigation over a 12-month period of alternative options to the proposed flood control dam in Brownhill Creek Recreation Park while other flood mitigation works in the catchment get underway.
Michael Salkeld, Project Director of the Brown Hill Keswick Creeks Stormwater Project, says council endorsement of the strategy now enables the draft stormwater management plan – as proposed last year by consulting firm WorleyParsons – to be updated and submitted to the Stormwater Management Authority for approval.
“This is another important step in finalising and implementing an effective stormwater management plan for the Brown Hill Keswick Creeks catchment,” he said.
“Representatives of the five councils have briefed the Stormwater Management Authority on the strategy, with the updated stormwater management plan to be submitted to the Authority by August.
“We envisage commencing flood mitigation works in early 2013, starting with the construction of a flood detention basin and stormwater harvesting facility along Glen Osmond Creek in Ridge Park at Myrtle Bank.”
Council Set to Progress Stormwater Management Plan
A stormwater management plan for the Brown Hill and Keswick Creeks catchments is a step closer following a strategy proposed by the Chief Executive Officers of the five catchment councils involved in the project.
The strategy calls for the commencement of the bulk of proposed flood mitigation works – as recommended by consulting firm WorleyParsons – including construction of bypass culverts, detention basins, creek diversions and channel upgrades along the catchment.
In light of community concerns about the proposed flood control dam in Brownhill Creek Recreation Park, the strategy also commits to pursue a feasible alternative to the dam over the next 12 months while other works elsewhere in the catchment get underway.
CEOs from Adelaide, Burnside, Mitcham, Unley and West Torrens Councils will recommend the strategy and seek approval from their respective councils this month.
Michael Salkeld, Project Director of the Brown Hill Keswick Creeks Stormwater Project, says if the five councils endorse the strategy it will then form the basis of a stormwater management plan to be formally presented to the Stormwater Management Authority for approval.
“We are confident of moving forward with a stormwater management plan that has the support of all five catchment councils and takes into consideration the views and concerns of council constituents,” he said.
“We plan to present our proposed strategy to the Stormwater Management Authority this week and look forward to a positive outcome.”
Mr Salkeld says the strategy proposed by the five Council CEOs importantly takes into account feedback received during the recent community consultation process.
“Feedback from stakeholders including local residents and community groups has certainly helped shape the renewed strategy,” he said.
“What is clear is the need to start work on appropriate infrastructure measures that adequately reduce the impacts of flooding while delivering acceptable outcomes in terms of financial, environmental and social factors.”
More information about the Brown Hill Keswick Creeks Stormwater Project is available on the Adelaide, Burnside, Mitcham, Unley and West Torrens Council websites.
Brown Hill Keswick Creeks Draft Stormwater Community Consultation Report
Findings from community consultation regarding the Brown Hill Keswick Creeka Draft Stormwater Management Plan have been presented to the five catchment councils involved in the project.
The community consultation report has been compiled by planning firm URPS and highlights responses received from major stakeholders, including local residents, community groups and government agencies.
Overall, 2,172 members of the community submitted feedback forms, while an additional 29 written submissions were received from individuals and groups, including a petition regarding the proposed flood control dam in Brownhill Creek Recreation Park.
Key findings outlined in the report include:
- Based on analysis of the feedback forms received, 74% of feedback respondents considered an enhanced flood mitigation plan as “important/very important” compared to only 12% who deemed it “not important”;
- Majority backing for the Draft Plan from feedback respondents with 71% indicating support, compared to only 13% opposed;
- Strong support for proposed channel and culvert upgrades, diversions and improvements to planning, community awareness and creek maintenance, with 70% of respondents indicating their support for these initiatives;
- Of the infrastructure measures outlined in the Draft Plan, the flood control dam proposed for Brownhill Creek Recreation Park was opposed by over 4,000 signatures via a petition. Separate to this, of the feedback respondents, 32% were opposed to the dam compared to 60% indicating their support.
- Overall, the community consultation report highlights strong feedback for appropriate infrastructure measures to be implemented that adequately reduce the impacts of flooding while delivering acceptable outcomes in terms of financial, environmental and social impacts.
The six-week community consultation period ran from October 31 to December 12 last year and included three open days for the public to ask project consultants questions about the Draft Plan.
Michael Salkeld, Project Director of the Brown Hill Keswick Creeks Stormwater Project, said the five councils will now review the community consultation report ahead of considering the results of a secondary report due to be concluded shortly by engineering firm WorleyParsons.
“The five catchment councils will review the community consultation report as well as the results of WorleyParsons’ supplementary report into potential variations to the Draft Plan,” said Mr Salkeld.
“They will then consider any suggested revisions to the existing Draft Plan prior to making their formal recommendation to the Stormwater Management Authority for approval.”
Consultation Has Closed on the Draft Stormwater Management Plan
A Draft Stormwater Management Plan has been prepared for the Brown Hill and Keswick Creeks catchment.
The catchment is made up of the Brown Hill, Keswick, Glen Osmond and Parklands Creeks that flow through the Cities of Adelaide, Burnside, Mitcham, Unley and West Torrens.
The principal objective of the Draft Stormwater Management Plan (the Draft Plan) is to reduce the impact of major flooding across the catchment.
Between 31 October and 12 December 2011 a community consultation process was undertaken for the Draft Plan. Members of the public were invited to attend open days to learn more about the Draft Plan, and were also invited to provide their feedback. The consultation period has now closed.
The feedback collected during the consultation process will be collated into a Consultation Report.
The Consultation Report will be used to determine any changes to the Draft Plan before it is submitted to each catchment Council, and then the Stormwater Management Authority for approval.
The steps involved in this process are as follows:
31 October – 12 December 2011
Information provided about the Draft Plan and feedback collected.
December 2011 – January 2012
All feedback collected is collated and summarised into a Consultation Report.
February – March 2012
Findings of the Consultation Report are reviewed from a technical and feasibility perspective by the project team. Recommended changes to the Draft Plan as a result of review of the consultation findings are agreed and documented.
Elected Members of Adelaide, Burnside, Mitcham, Unley and West Torrens Councils review the Consultation Report and the recommended changes to the Draft Plan.
Elected Members of Adelaide, Burnside, Mitcham, Unley and West Torrens Councils formally approve the Stormwater Management Plan.
30 April 2012
The Stormwater Management Plan is submitted to the Stormwater Management Authority for their approval.
Please click here for more information.
Mitcham Council Receives Options to Enhance Draft Stormwater Management Plan for Brown Hill Keswick Creek
The City of Mitcham has released a report into possible enhancements of flood mitigation options for Brown Hill Creek.
The ‘Preliminary Assessment - Enhancement of Flood Mitigation Options’ report was commissioned by the City of Mitcham following the release of the Draft Stormwater Management Plan for Brownhill and Keswick Creeks prepared by WorleyParsons.
The preliminary enhancement report presents options which build on the current preferred option outlined in the Draft Stormwater Management Plan. These preliminary options include three options based on no dam scenarios and two options with reduced heights for the dam proposed in the Brown Hill Creek Recreation Park.
Each potential option involves additional works in the middle and lower reaches of Brown Hill Creek which ensure larger quantities of flood water can flow through the system and utilise a combination of creek upgrading, enlarging proposed channels or constructing new channels or culverts.
The preliminary enhancement report, which requires further feasibility investigation, includes information on the proposed works and provides estimated costs for each scheme, together with the estimated residual flood damage associated with each of the five options.
Michael Picton, Mayor of the City of Mitcham said ‘‘Council recognises the need for flood mitigation works in the Brownhill and Keswick Creek catchments and we remain committed to a catchment wide approach to stormwater management working in partnership with the Cities Adelaide, Burnside, West Torrens and Unley.”
“The City of Mitcham wants to play its part in delivering the best outcome on behalf of all residents and businesses along the catchment, including our own community. Council has been aware of strong views in the community on the proposed construction of detention dams in Brown Hill Creek Recreation Park and engaged WorleyParson again to consider variations to the option recommended in their draft Stormwater Management Plan.”
“The Preliminary Assessment - Enhancement of Flood Mitigation Options’ report potentially offers alternative flood mitigation options for Brownhill Creek, including the option to eliminate the proposed dam in Brownhill Creek Recreation Park altogether.”
“It is important to realise that these are preliminary assessments and further work needs to be undertaken to determine full feasibility.”
“As with any options there are impacts as well as benefits. Options presented in the preliminary enhancement report may require additional culverts to be built in residential streets and/or the upsizing of a number of proposed culverts in the Unley Council area.”
“These alternative choices gives Council the opportunity to consider options which appear to meet the objectives set for the project in a way that doesn’t add excessively to the overall scheme costs whilst taking account of environment, heritage, social and recreational benefits.“
“Council strongly supports the community consultation on the draft plan which concludes on Monday 12 December. This preliminary enhancement report will be included as part of our submission to the consultation process”. Mayor Picton said.
The preliminary enhancement report has been supplied to the project team and to the Cities of Unley, Burnside, Adelaide, West Torrens and Mitcham.
Have Your Say
From 31 October to 12 December 2011 members of the public are invited to provide feedback on the Brown Hill Keswick Creek Draft Stormwater Management Plan. To Have Your Say click here
Community Consultation to Commence for Brown Hill Keswick Creek Stormwater Plan
Members of the public will have opportunities to learn more about proposed flood mitigation measures for the Brownhill Keswick Creek catchment with a community consultation process set to begin (Monday, October 31).
The six-week community consultation process will run until December 12 and include three open days where people will be able to drop in and ask questions about the Brown Hill Keswick Creek Stormwater Project Draft Plan involving the Adelaide, Burnside, Mitcham, Unley and West Torrens Councils.
Michael Salkeld, Project Director of the Brown Hill Keswick Creek Stormwater Project, encourages local residents to get involved in the consultation process. "Members of the public already have access to the Draft Plan via council websites, while hard copy versions can be viewed at council offices during the community consultation process," said Mr Salkeld.
"A summary report outlining key findings of the Draft Plan will also be available to the public, as will a summary brochure that will be distributed throughout the catchment. "There will also be a series of open days in November for people to drop in anytime and learn more about the proposed flood mitigation measures and give feedback which will be considered before finalising the Draft Plan."
The three open days have been scheduled for the following dates:
Thursday 17 November 2011 (drop in anytime between 5pm-9pm) - Unley Town Hall, Unley
Saturday 19 November 2011 (drop in anytime between 11am-3pm) - City of Mitcham Civic Centre, Torrens Park
Tuesday 22 November 2011 (drop in anytime between 4pm-8pm) - City of West Torrens Civic Centre, Hilton
The feedback collected during the community consultation process will be summarised into a consultation report and presented to the five catchment councils in determining any changes to the Draft Plan. Once the plan has been finalised to the satisfaction of each council, it will be submitted to the Stormwater Management Authority for approval.
Mr Salkeld says the Draft Plan, produced by leading engineering firm WorleyParsons, outlines flood mitigation options and makes recommendations on a stormwater management strategy, including the possibility of establishing a 12m-high flood control dam of a similar size to the Mount Lofty Botanic Garden dam. "There is a history of flooding in the catchment so implementing an effective stormwater management strategy is crucial to improve the standard of flood protection for homes, businesses and public facilities across the region," he said.
"In accordance with planning guidelines set down by the Stormwater Management Authority, the flood mitigation strategy takes a catchment-wide approach with each of the infrastructure proposals designed to support one another."
Councils to consider Draft Stormwater Plan for Brown Hill and Keswick Creeks
A draft stormwater management plan designed to mitigate severe flood risks and protect homes across Adelaide has been presented to five metropolitan councils for community consultation.
Developed by leading engineering firm WorleyParsons, the draft plan has been produced as part of the Brown Hill Keswick Creek Stormwater Project on behalf of the Adelaide, Burnside, Mitcham, Unley and West Torrens Councils.
The draft plan will subsequently become the focus of a six-week community consultation process from October 31 to December 12 when the public will be invited to discuss the plan and provide feedback. Times and locations for the community consultation process will be confirmed soon and promoted to the public through council websites.
Project Director of the Brown Hill Keswick Creek Stormwater Project, Michael Salkeld, says the draft plan updates the 2006 Flood Management Master Plan and represents a major step forward in establishing an effective flood mitigation strategy for the catchment.
"The Brown Hill, Keswick, Glen Osmond and Parklands Creeks in particular have a long history of flooding issues, with suburbs surrounding these creeks remaining high flood-risk areas," he said. "This draft plan has been developed to improve the standard of flood protection for homes, business and public facilities across these suburbs.
"The five catchment councils involved in the project will consider the draft plan while the public will also be invited to have its say during an extensive community consultation process to be carried out later this year."
Mr Salkeld says the draft plan outlines flood mitigation options investigated and makes recommendations on a stormwater management strategy, including the possibility of establishing a 12m-high dam which would only hold water immediately after a major storm and which would be of a similar size to the Mount Lofty Botanic Garden dam.
The draft stormwater management plan is available on the Adelaide, Burnside, Mitcham, Unley and West Torrens Council websites, which will continue to provide updates on the Brown Hill Keswick Creek Stormwater Project.
Brown Hill Keswick Creek Stormwater Draft Stormwater Management Plan
The Cities of Adelaide, Burnside, Mitcham, Unley and West Torrens have jointly commissioned this Draft Plan which has been prepared by consultants WorleyParsons.
During September and October 2011, Elected Members of all five catchment Councils will be briefed on the Draft Plan and following this, will formally receive the Draft Plan for community consultation at their scheduled Council meetings.
This will be followed by a six week community consultation process that will be carried out by consultants URPS. During the community consultation, members of the public will have the opportunity to view and discuss the Draft Plan with its authors at a series of Open Days. Written feedback will be sought during this period. Details of the consultation process, including the dates and locations of the Open Days, will be available in the coming weeks.
If you would like to receive an update about the consultation process for the Draft Stormwater Management Plan, please contact Council's Customer Service Centre on 8372 8888 to register your email or postal address.
Conducting a Survey of the Brown Hill and Keswick Creek Watercourses
Work is about to begin on a field survey of the whole of the Brown Hill and Keswick Creek watercourses, from early June to the end of July 2011.
This is part of a major initiative to carry out flood mitigation and reduce potential flood damage. Part of the watercourse may be located within your property boundary. The purpose of this survey is to determine the current channel capacity, and take note of flood obstructions, dense vegetation, bank instabilities and the like.
An overall Stormwater Management Plan for Brown Hill and Keswick Creeks is being prepared by the Cities of Unley, West Torrens, Burnside, Mitcham and Adelaide. The information from this survey and hydraulic assessment will help determine the current channel capacities along the watercourses.
The survey will be undertaken by Hennig & Co Surveyors, under the direction of AWE Engineers. They will work only along the creek with access by field staff in and out from public road crossings so there should be minimal need to enter across your property. However in the case of bad weather or the presence of debris in the creek, it may be necessary for the access to take place through your property. In such a case every effort will be made to avoid disruption.
The Engineers and Surveyors will wear Hi-Vis jackets with the name of the company clearly identified on the jackets and their vehicles. They will be carrying letters of authority from the NRM Board.
If you have any concerns please contact Mr Chris Wright, or Mr Steve Gatti, on telephone 8273 9100.
Mitcham Council Supports New Timelines to Develop the Brown Hill and Keswick Creeks Stormwater Management Plan
The City of Mitcham is one of the first catchment Councils to approve a new timeframe and process to complete the preparation of the Brown Hill and Keswick Creeks Stormwater Management Plan.
Council remains committed to a regional approach to stormwater management in the Brown Hill and Keswick Creeks catchment and the implementation of a well researched and considered flood mitigation plan.
A study, being prepared by consultants WorleyParsons, should be completed by the end of June 2011 for consideration by the catchment Councils' Cities of Mitcham, Unley, Burnside, West Torrens and Adelaide by mid September 2011.
Michael Picton, Mayor of the City of Mitcham said "This new timeframe and process, which outlines the steps to complete a revised Stormwater Management Plan, is much more realistic than the original date of 30 April 2011".
"Council believes the new timeframe and process should ensure that the necessary time and expertise is allocated for the proper evaluation of all flood mitigation options and consultation with the community on the draft Brown Hill and Keswick Creeks Stormwater Management Plan."
"It is important the new plan, being developed by WorleyParsons, considers all flood mitigation options, along with the costs associated with these options. Only in this way can we ensure that an optimum flood alleviation method is achieved for residents living in the catchment who may be affected by flooding" said Mayor Picton.
The new timeframe and process, prepared by the Brown Hill Keswick Creeks Project Director on behalf on the catchment Councils', details the steps for completion of the revised Stormwater Management Plan including the planned community consultation, these include:
- Receipt of the draft Stormwater Management Plan report by end of June 2011.
- Review of the report and Councils' consideration by mid September 2011.
- Community consultation on the plan from mid September to end of October 2011.
- Review of consultation outcomes by mid December 2011.
- Councils' approval of the Stormwater Management Plan and submission to the Stormwater Management Authority by early March 2012.
Mayor Picton said "This new timeframe and process should ensure that WorleyParsons has the necessary time to carry out floodplain modelling, simulating flood events in the catchment area and assess the approximate extent and depth of flood inundation for different mitigation options."
"This new timeline will provide an opportunity for the community to comment on the draft plan before the catchment Councils finalise the draft Brown Hill and Keswick Creeks Stormwater Management Plan for consideration by the Stormwater Management Authority".
"However if issues arise during this process Mitcham will request a review of the timing and process to allow for further investigation and consultation with the community" said Mayor Picton.
New Stormwater Study Highlights Increased Flooding Risk in the Brown Hill and Keswick Creeks Catchment.
The City of Mitcham's concerns about accurate flood mitigation in the Brown Hill and Keswick Creeks catchment have been realised during the new study undertaken by the Cities of Mitcham, Unley, Burnside, West Torrens and Adelaide.
The new study by consultants WorleyParsons, engaged by the Brown Hill and Keswick Creeks catchment Councils, demonstrate over 3,500 properties would still be flooded after the completion of the proposed plan.
City of Mitcham Mayor, Michael Picton said "This week during a meeting between the Stormwater Management Authority and the Cities of Mitcham, Unley, Burnside, West Torrens and Adelaide, it was confirmed that errors had been made in the modelling of flooding in the 2006 Plan."
"If projects in the 2006 Plan had been undertaken double the number of properties originally estimated in the 2006 Master Plan would have been flooded."
"I believe it is now imperative that the new plan, using the correct data, evaluates all the proposals before committing valuable ratepayer money to undertake design work" said Mayor Picton.
With public awareness of the risk of flooding heightened following the recent floods in Queensland, Council remains committed to a regional approach to stormwater management in the Brown Hill and Keswick Creeks catchment which considers factors such as water reuse, harvesting or storage with sound environmental outcomes.
"Although Councils are under considerable pressure to come up with an answer quickly, it is vital to take the time to get it right".
"The new plan, being developed by WorleyParsons, must ensure the options for flood mitigation provides value for money for all residents living in the catchment which maybe affected by flooding".
"On behalf of our community we will continue to fight to make sure that the necessary time and expertise is allocated to ensure the proper evaluation of all flood mitigation options" said Mayor Picton.
Mitcham Council will continue to work closely with all catchment Councils and WorleyParsons to review flood mitigation options to ensure errors are eliminated so the community will get a much needed, affordable and sustainable flood mitigation project.
Mayor Picton said "We want to ensure that both the catchment Councils and WorleyParsons are not pressured to meet strict timelines to deliver immediate results, but have an opportunity to thoroughly explore and evaluate all possible options."
"There is no quick fix. We need a long term solution to stormwater management."
Mitcham Supports Effective Flood Mitigation to Protect Community
The community has been given some incorrect information about action required to prevent flooding over a section of the Adelaide Metropolitan area.
The five councils affected, Adelaide, Mitcham, West Torrens, Unley and Burnside have commissioned a new Stormwater Management Plan to correct the flaws in the earlier 2006 Master Plan.
City of Mitcham Mayor, Michael Picton said "Consultants are currently investigating a range of options and scenarios for the protection of the community. If nothing is done, more than 5,000 properties would be flooded in a 1 in 100 year event. However, carrying out all the projects, including the two dams, won't stop all the flooding. In fact, the first draft of the Consultants' report shows that in this case there would still be over 3,500 properties flooded, more than double the number shown in the 2006 Plan, after all projects are completed."
"Because there are so many properties unprotected from flooding, and because there have been major changes from the 2006 flood mapping, Mitcham has asked for further checking on all data. It has now been acknowledged that errors were made in the earlier Brown Hill Creek flood modelling. This error would also have affected Keswick Creek. It is vital that the Keswick Creek Catchment also be independently reviewed to ensure the validity of the overall Flood Management Plan."
"Following the data check, further consideration will be required on the sizing and design of the diversion channels from Keswick Creek into Brown Hill Creek at Anzac Highway. This should include consideration of how flow interception can provide greater damage reduction benefits at a much lower cost than the construction of two new dams."
"Mitcham Council is portrayed by some in the community as being opposed to flood mitigation: that is wrong. Mitcham is, and has always been, mindful of the benefits to the wider community of effective flood mitigation. Errors have been found in the 2006 Plan. The community has a right to expect that proper and correct data be used in a Plan that ensures the best outcome for everyone. What we don't need is a scheme implemented before appropriate due diligence has been undertaken" said Mayor Picton.
VDM Hydrology Report
For some time Council has been working with the other Brown Hill and Keswick Creeks catchment Councils Burnside, Adelaide, Unley and West Torrens to put in place a number of positive flood mitigation measures that will provide benefits to the residents and ratepayers of the City of Mitcham. Council has been vigorous in its approach to ensure flood mitigation measures are realistic, cost effective, in harmony with the environment and that these measures can be supported by the community.
The Brown Hill and Keswick Creek Flood Mitigation Study, Flood Management Master Plan is considered deficient by the City of Mitcham in many areas particularly environmental considerations. To this end, Council commissioned an experienced hydrology consultant to undertake a review of the hydrology that formed the basis of this plan and to investigate alternative and more environmentally friendly flood mitigation solutions. The study is now complete and the work has revealed that potentially there could be more properties affected by floodwaters during major storm events.
A copy of the VDM Hydrology Review can be viewed on this website.
Please be advised that this review is an estimation only of the properties that could be potentially affected by flood waters in a major storm event and is provided for information only. The report will be forwarded to various stakeholders such as, the Stormwater Management Authority, the Adelaide and Mount Lofty Ranges Natural Resources Management Board and the results will form part of the overall consideration when compiling a new Stormwater Management Master Plan for Brown Hill Creek.
Copies of the report can also be viewed at the City of Mitcham Civic Centre, 131 Belair Road, Torrens Park, the Blackwood Library, 215 Main Road, Blackwood, and the Mitcham Library, 154 Belair Road, Hawthorn.
Should you require any further information in relation to the potential flooding of Brown Hill Creek or the VDM Hydrology Review please contact Council's Special Projects Engineer, John Wiley on 8372 8131.
Brown Hill Creek Public Meeting
Council conducted a public meeting on Wednesday 25 November to provide information on the status of the City of Mitcham's approach to stormwater management of Brown Hill Creek including an update of its Brown Hill Creek Sustainable Flood and Water Management Project.
A copy of the presentation from the public meeting is available below:
A copy of the a report titled "A Review of the Justification for the Construction of Two Large Detention Dams in the Upper Reaches of Brown Hill Creek" was received by Council to promote discussion on the components and staging of the "Brown Hill And Keswick Creeks Flood Mitigation Study Flood Management Master Plan" with all stakeholders. A copy of this document is available below and has been distributed to all Elected Members and Chief Executive Officers of Adelaide, Burnside, Unley and West Torrens Councils; All members of the Parliament of South Australia; House of Representative Members for the electorates of Adelaide, Boothby, Hindmarsh and Sturt and all Senators for South Australia; The Natural Resources Committee of the Parliament of South Australia; The South Australian Stormwater Management Authority; The Adelaide and Mount Lofty Ranges Natural Resources Management Board; and Media outlets including Messenger Newspapers, The Advertiser and ABC 891 Mornings (Matt Abraham and David Bevan).
The City of Mitcham continues to remain committed to a regional approach to stormwater management in the Brown Hill Creek catchment. Council continues to consider stormwater management in the city, grappling with the need to make decisions in an environment where there are many competing factors, with limited data and a project which is continuing to evolve. A full copy of Council's resolutions on the Brown Hill Creek can be downloaded below.
Mitcham is Committed to a Regional Approach to Stormwater Management
30 January 2009
The City of Mitcham, at last nights Full Council meeting, resolved not to sign the current Memorandum of Agreement however continues to remain committed to a regional approach to stormwater management in the Brown Hill Creek catchment.
Council will undertake a Stormwater Management Plan for the Brown Hill Creek catchment which focuses on a holistic approach to stormwater management not just flood mitigation but also, purification, re-use and storage.
Mayor Ivan Brooks said "We remain committed to a stormwater management solution for Brown Hill Creek to ensure the protection of residents and the environment within the catchment."
"The Council is keen to work on a regional catchment basis to achieve sustainable water management for current and future communities."
"To achieve this Council will invite Adelaide Hills, Unley and West Torrens Councils to participate in the preparation of the Stormwater Management Plan for the Brown Hill Creek catchment" said Mayor Brooks.
The City of Mitcham remains concerned about the Brown Hill and Keswick Creeks Flood Mitigation Study and Flood Management Master Plan which is based on concrete channels and dams with little or no sustainability, water reuse or environmental improvement components.
The plan, not endorsed by Council, diverts stormwater from the Keswick Creek catchment to the Brown Hill Creek catchment which Council believes places an unreasonable burden on the communities living within the Brown Hill Creek catchment.
The City of Mitcham is committed to ensuring that no environmental damage occurs within the Council area and stormwater flows in the Brown Hill Creek catchment are not increased by the diversion of waters from other catchments.
Ms Helen Dyer said "This is an extremely complex and important matter and one in which the Council takes its due diligence role very seriously".
"Council has considered the matter in depth on a number of occasions, grappling with the need to make decisions in an environment where there are many competing factors, with limited data and a project which is continuing to evolve."
A report will be presented to Council on the requirements for writing the Stormwater Management Plan for the entire Brown Hill Creek catchment that accords with requirements of the Local Government Act and the Stormwater Management Authority, including consideration of budgets, estimated costs of the plan, time lines and stormwater capture and reuse requirements.