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Flood Management Advisory Committee Meeting 27 July 2023 |
AGENDA |
1 Apologies
2 Disclosures of Interest
3 Confirmation of Minutes
Minutes of 30 August 2022 Flood Management Advisory Committee 4
4 Items for the Committee
ITEM |
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FMAC0727(1) Item 1 |
Dobroyd Canal and Hawthorne Canal Flood Risk Management Study & Plan – Proposed Endorsement |
FMAC0727(1) Item 2 |
Alexandra Canal Flood Risk Management Study & Plan and Johnsons Creek and Whites Creek Flood Risk Management Study & Plan – Review of initial mitigation proposals |
FMAC0727(1) Item 3 |
Review of Committee Terms of Reference |
5 General Business
6 Close of Meeting
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Flood Management Advisory Committee Meeting 27 July 2023 |
Minutes of Meeting - 30 August 2022
Meeting commenced at 2.05PM
1. Acknowledgement of Country
Acknowledgement of Country by Clr Mat Howard
I acknowledge that we are meeting on the land of the Gadigal and Wangal people and pay respects to their elders past and present and I acknowledge any elders that are here with us today. I do think it’s important that as we embark on this meeting today to acknowledge that sovereignty was never ceded both over land and water and to acknowledge the custodianship for millennia over the lands and waters that we live on and amongst.
2. Present
Voting Members |
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Chair |
Clr Mat Howard |
Councillor |
Clr Marghanita Da Cruz |
State Emergency Service |
Alexander Bailey |
State Emergency Service |
Robert Baker |
Community Representative |
Lois Gray |
Community Representative |
Shad Wall |
Non-voting Technical Advisory Members |
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Inner West Council |
James Ogg |
Inner West Council |
Rafaah Mian |
Inner West Council |
David Paton |
State Emergency Service |
Liam Hogan |
State Emergency Service |
Klaus Neuscheler |
State Emergency Service |
Deborah Kearns |
City of Sydney |
Stuart McTaggart |
3. Apologies
Community Representative |
Tim Harnett |
Community Representative |
Rhonda Kruger |
Sydney Water |
David Grasby |
Inner West Council |
Joe Di Cesare |
Inner West Council |
Michael Gallardo |
Inner West Council |
Manod Wickramasinghe |
State Emergency Service |
Peter Kaye |
Motion (acceptance of apologies): (Clr Marghanita/Lois)
Motion carried unanimously
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4. Terms of Reference
The Committee is advisory in nature and any recommendations are not binding on Council. The Committee currently has nine voting members of which six voting members were present, satisfying a quorum of 50% for the meeting.
5. Disclosures of Interest
Councillor Mat Howard disclosed that he currently works in the office of Jo Haylen the member for Summer Hill. Councillor Howards capacity includes often engaging with Sydney Water on issues pertaining to state related matters. This does not impact Councillor Howards fulfilment of responsibilities as a voting member of the Flood Advisory Management Committee or Chair, however wanted the issue to be noted.
Motion: (Clr Marghanita/Lois)
Motion carried unanimously
6. Confirmation of Minutes
Minutes of the previous meeting held 28 March 2019 were accepted as correct.
Committee Recommendation:
THAT the minutes of the previous Flood Management Advisory Committee meeting be noted and accepted.
Motion: (Lois Gray/Robert)
Motion Carried Unanimously
7. Staff Reports
FMACC0822(1) - Item 1 - Inner West Council Flood Response
James Ogg provided the committee with a flooding report that Councils General Manager Peter Gainsford had requested for James to prepare, given the substantial volume of rain and flooding that has occurred this year. Points discussed from this report include;
This year is approaching one of the wettest years on record, in the City of Sydney since record keeping began. The current year on record is 1962, with just over 2000mm of rain. To date when this report was written, Sydney had experienced just over 1700mm of rain, however since then we have had an additional 100mm of rain since.
The Telegraph had an article advising that Sydney is currently 200mm away from the wettest year on record. This rainfall is twice the size of what was previously experienced in 2017, 2018, 2019 and comparable with flooding years of known flooding in 1988 and 1990. The two worst days this year were probably the 23rd of February and the 8th of March 2022, with smaller rainfalls happening in April and July.
The flooding that Inner West received as a whole is flash flooding, which is overland flooding that comes from higher catchments through the local valleys, the exception being Marrickville which sits on a former swamp land and is quite low lying compared to the creek, therefore water will pond in there much more prolonged and relies on pumping stations that are owned and operated by Sydney Water to drain the majority of the flows in there.
The report notes that the SES is the lead agency in responding to flood matters. Council supports them in provision of providing barricades, road closures and sandbags were provided for the last storm events. Council undertakes proactive drain cleaning in the days leading up to storms and also have a list of hot spots that the maintenance crew tend to throughout the year. Council is also aware of vital locations throughout the drainage network in the LGA, hence Councils Civil Works team were involved in the removal of debris, tree branch removal as well as attending out of hours call outs.
Councils long term flood management plan includes, completing flood studies for all the Inner West/Council area. There is an area of Marrickville and Dulwich Hill that remains and does not have a modelled flood study, however the remainder of the Council areas are modelled, with Flood Risk Management Plans now available for 80% of the LGA.
In addition, there are substantial costs associated with the studies and plans, however Council is slowly developing an implementation program that is tied with areas that require stormwater renewal works or in areas of existing developments. Currently, this has been Council’s prioritisation, however Lords Street Drainage is an example outside of the priority method. Lord Street drainage upgrade is currently under design and being finalised this year for delivery in Newtown. In the following years there will be additional lower cost improvements that Council can begin implementing, that will be put into Council’s stormwater capital works program moving forward.
A lot of higher costing mitigation methods are shared with Sydney Water and Council have been liaising with them in regard to their next Capital Works plans. These plans can be further discussed in the next flood access management meeting, upon David Graysby’s return to Sydney Water. However, currently Council have assigned contributions within the draft program for Whites Creek and areas of Haberfield as well as some minor considerations in Marrickville.
Comments and Questions Arising
Action: Councilor Howard asked James Ogg to make an action note, for the events team to be in contact with the SES for flooding/storm events.
Question: Councilor Da Cruz asked if flooding was caused just by increased rainfall or if Council had an issue with an increase of hard surfaces and more runoff and weather Council was cleaning the drains in Marrickville from the army land to the canal and if Council were stopping people from throwing rubbish around the area.
Answer: James Ogg provided comment that there is still uncertainty in terms of the additional impacts of climate change and what weather patterns will do to increase flooding as there are a number of factors that can relate to it. Currently the guidance is that flood modelling needs to be undertaken at 10% and 20% to test the changes. Studies indicate that the rainfall increases cause flash flooding with quick peak and drop. Additionally, the two factors that create runoff is the permeability of the ground and how intense the rain is coming on to it. In situations where the ground is saturated, the soft grounds can be just as bad as hard surface in terms of direct runoff and what we are seeing more of this year. Additionally, in the last few years there has been updates to the Australian Rainfall and Runoff Guidelines, previous to this was from 1984, hence an addition of 20 years of rainfall data helps create patterns a lot more accurately.
Question: Lois Gray asked/raised concerns regarding what Alexander had explained, regarding the water at the creek mouth meeting the water in the Harbour. Issue being the rain that we have had, did any of that coincide with the extremely high tides and if it didn’t, is the modelling completed for Hawthorne Canal adequate for what we would be experiencing in future rainfall events.
Response: James Ogg provided a response by stating that there was some interaction with high tides, particularly in the march storms which affected the Carrington Rd precinct as it lies on a previous swamp area, hence it ponds a lot more and drains a lot slower into Cooks River. James further advised that he was unaware of any substantial interactions at Hawthorne Canal, whereby the tide level was causing the water to not flow through properties and directly out to the canal. Currently there is only one space where you get the two meeting, down towards the Defense force site at Canal Rd.
Action: Councilor Howard asked James Ogg on the feasibility of having these signs reinstated.
Question: Debris and drains, what was Council doing to ensure that the network was operating at full capacity, with specific focus on the Defense Force site, around Marrickville and more specifically around Carrington Rd
Answer: Council have developed an internal hotspot location list. If Council were to try and get to every pit it would take two or three years to do the entire network, however currently there are 150 pits noted on this list. This list includes locations that are in critical spaces, whereby a pit were to block or the pits around were to block causing cascading issues, they are either sags in front of properties or areas of particular interest. This list isn’t set it’s a live working list and more attention will be given to it. Council cleaning crews tend to these locations month after month and note pits with large volumes of silt and debris. These locations are then referred for CCTV survey and cleaning of the network. Currently Council is reactive to stormwater pipe cleaning, however, have a CCTV survey program that outlines what pipes are blocked, broken or require cleaning. Damaged pipes that are operating at their total capacity either have small repairs undertaken under Council maintenance team or are placed on Councils Capital Works Program for larger works, for the next available financial year.
In terms of the Defense Force site the project managers had the stormwater pipe network surveyed and the survey showed that the pipe was running clear. They are currently undertaking works in that space to upgrade portions of that pipe as part of their subdivision approval. Once that is completed, they are completing every part of their roadworks permit including how they could demonstrate, how they could continue to provide overland flow through the site so that it wouldn’t cause flooding in O’Connor Street whilst they were under construction. There is also a gross pollutant trap at the end of those lines that will be handed back to Council at the end of construction and will be part of 18 gross pollutant traps that Council currently has on cyclic cleaning, undertaken by a contractor.
In terms of Marrickville, there has been a lot of works happening in the Carrington Rd precincts recently. Council had a meeting with Sydney Water and Sydney trains to go over what works they had undertaken to clear a lot of the channels that have become overgrown in that space. Council’s understanding is that Sydney Trains should be maintaining those channels, however Council is still currently in discussion with Sydney trains regarding their understanding of this. However, they have ensured that those channels are clear and have cut back a lot of growth that was happening in that space. Sydney Water have done some desilting of the components that they have and Council has undertaken cleaning of our own pipes in the area as well.
Action: Councillor Howard askes James to confirm with him via email if the intake pipes that had been sent to him had been completed or scheduled to be completed shortly. Councillor Howard would like to be updated regarding this as it would give confidence to the community that the work has been completed.
· Councilor Howard commented that by working as a member for Summer Hill, he had been advocating really strongly for Sydney Water to conduct a lot of desilting work. Clr Howard had also been working really closely with Sydney trains and the ARTC about the O’Hara and Burn Street flooding that regularly occurs. They pulled out a bunch of things from underneath the revolution building, including some construction work from 15 years ago. The work that happening there is fantastic, however the community focus will shift very quickly back to Council.
Action: Councillor Howard requested that Council provide a better understanding in regard to the maintenance schedule around Carrington Rd in South Marrickville as this would give some confidence to the Community that everyone was pulling in the same direction.
Committee Recommendation:
THAT the report be noted and accepted. Council to provide advice/confirmation to Councillor Howard on the requested items.
Motion: (Lois/Alex)
Motion Carried Unanimously
FMACC0822(1) Item 2 Community Engagement – Johnstons Creek and Whites Creek Flood Risk Management Plan and Alexandra Canal Flood Risk Management Plan
James Ogg provided a power point presentation outlining flooding information available to residents in the Inner West LGA, via Councils website. Some this information included how catchments are subdivided, links to existing flood studies and studies available to date and general information.
There are currently 9 primary catchments with Dobroyd Canal located to the north-west of the LGA and Hawthorn Canal located north of the LGA and both ultimately discharging to Iron Cove. Marrickville Valley is located towards the south of the LGA. Johnstons Creek sits on the eastern boundary of the LGA whilst Whites Creek is in the north-eastern region of the LGA, both draining to Rozelle Bay. Councils foreshore catchment is a combination of a dozen small micro catchments, that discharge individually to Parramatta River, Sydney Harbour and Rozelle Bay. Alexandra canal is located to the south of the LGA and we also have a small catchment called Marrickville South, which delas with a small section of Marrickville and Dulwich Hill along the Cooks River. Council currently also has two small catchments which contribute to the flooding areas in the Burwood and Canada Bay LGAs. Currently Council has 90% of the LGA covered with flood modelling, outlining flooding that is likely to happen. Currently the last key catchment that requires a flood study is Marrickville South, which drains to Cooks River.
Johnstons Creek and Whites Creek and Alexandra Canal previously had a flood model and flood studies completed in 2017, showing areas of significant concern and flooding. Within Alexandra Canal there is five target areas or hotspots, where flooding is of significance requiring mitigation strategies. Johnstons Creek and Whites Creek is focusing on the areas south of Parramatta Rd as areas north of Parramatta Rd were included in the Leichardt Flood Study.
Council has been working with Cardno a specialised consultant, for a year to revisit the flood modelling to current rainfall standards. Council is currently ready and preparing to undertake community consultations. A proposed engagement period is from the 12th of September and runs for four weeks. There will be two main avenues for community consultation including online where residents may fill out a form online or engagement sessions whereby residents can attend in person and raise questions. As the Alexandra Canal affects both residents and businesses there will be two dedicated sessions for both.
Comments and Questions Arising
James Ogg responded to questions including:
Question: Robert Baker asked when residents would have access to the studies.
Answer: The plan is currently not formed yet, however we are working with Cardno to create the plan and expect it to be completed in May of 2023. This is the initial community consultation at this stage.
Committee Recommendation:
THAT the committee supports the commencement of community engagement for the Johnstons Creek and Whites Creek Flood Risk management plan and the Alexander Canal Flood Risk Management plan.
Motion: (Councillor Da Cruz /Robert Baker)
Motion Carried Unanimously
8. Review of Terms of Reference
James Ogg commented that the terms of reference suggests up to 8 community members and that the term of the community members was to be two terms of Council. In addition he believes the committee is currently just within these boundaries as one term was completed under administration and the other term under Council, hence the committee is now due to take expressions of interest from community members for future meetings.
Question: James Ogg asked the committee if they would like to change the number of community members to reflect either the catchments or as per Councils wards.
Question: Councillor Howard asked how many community members were currently engaged with the committee
Answer: James Ogg advised that there were currently four community members Lois and Shad who were present and Rhonda and Tim who both gave their apologies.
Question: Councillor Howard asked if Council would seek advice about the way forward with community members and what were the next steps
Answer: James Ogg responded that he was happy to seek advice internally and that he was partly seeking advice from the committee, in regard to weather the committee wanted to express interest for new community members prior to the next meeting and also determine how many community members would be suitable.
Question: Lois Gray asked and commented that she assumed if she wanted to continue on the committee that she would need to re-apply.
Answer: James Ogg responded that he believes so, however he would need to seek advice, however he believed this to be the case.
Action: Councillor Howard commented that Council should seek advice from the governance team and to circulate this information in the committee and to also ensure that the criteria for any expressions of interest also recognizes service and level of experience.
Question: Councillor Da Cruz asked if the Sydney Catchment Authority was still in existence
Answer: James Ogg replied that he believed they still were however, they may have changed their name. Up until recently they had members sitting within groups such as the Parramatta River Catchment Group that the Council was part of or the Cooks River Alliance and the Sydney Coastal Councils Group.
Question: Councillor Da Cruz wanted to know if Council had technical members as part of the Parramatta River Catchment Group.
Action: James Ogg to follow up on this query. James further advised that from previous history there were representatives on this committee, including David Paton who was a technical guide. James further advised that he had also been sitting in with the technical committee for the parameter of the catchment group.
Question: Councillor Howard asked if Council would revise the terms of reference with staff and then initiate any change from there or would it required to be endorsed by Council or the FMAC committee.
Answer: James Ogg replied that changes in the terms of reference needed to be endorsed by the group. An action point would be to take the advice to the next meeting, in terms of the numbers proposed and changes.
Question: Councillor Howard asked when the next meeting was scheduled
Answer: James Ogg advised that there was currently no schedule, however a frequency should be determined. James further suggested that when Council moved to the second phase of community engagement, most likely February 2023, the committee should provide feedback on the mitigation measures proposed. This would bring the next meeting to late January/early February.
9. General Business |
No general business for discussion
Meeting closed 3:35pm