Works Committee Meeting
Tuesday 14 June 2016
Administrative Centre 30 Frances Street Randwick 2031
Telephone: 1300 722 542
Fax: 02 9319 1510
Notice is hereby given that a Works Committee Meeting of the Council of the City of Randwick will be held in the Council Chamber, First Floor, 90 Avoca Street Randwick on Tuesday, 14 June 2016 at 6:00 p.m.
Quorum: Eight (8) members
Apologies/Granting of Leave of Absences
Confirmation of the Minutes
Works Committee Meeting – 12 April 2016
Declarations of Pecuniary and Non-Pecuniary Interests
Address of Committee by Members of the Public
In respect to Privacy & Personal Information Protection Act, members of the public are advised that the proceedings of this meeting will be recorded for the purposes of clause 69 of Council’s Code of Meeting Practice.
W13/16 Coogee Bay Floodplain Management Committee..................... 1
W14/16 Sports Committee Meeting Minutes....................................... 9
Notice of Rescission Motions
Works Report No. W13/16
Subject: Coogee Bay Floodplain Management Committee
Folder No: PROJ/10515/2009
The prime responsibility for planning and management of flood issues in NSW rests with local government. Randwick City Council has committed to carrying out Flood Studies and preparing Floodplain Risk Management Studies and Plans. They are carried out in accordance with the Floodplain Development Manual (NSW Government) and will allow Council and other stakeholders to be better informed and to better manage flooding in storm events.
The first step in the floodplain management process is to complete a flood study. For the Coogee Bay catchment, the study was adopted by the Council on 11 June 2013. The next step is to complete a Floodplain Risk Management Study and Plan which determine options to reduce the flood risk.
The specialist consultant Cardno was engaged by Council to undertake the Coogee Bay Floodplain Risk Management Study and Plan. The Draft Floodplain Risk Management Study and Plan for the Coogee Bay catchment was presented at a meeting of the Coogee Bay Floodplain Management Committee on 4 April 2016. A copy of the minutes, which reflects discussions and outcomes, is attached to this report.
The Coogee Bay Floodplain Management Committee recommended that the Draft Coogee Bay Floodplain Risk Management Study and Plan be placed on public exhibition.
Impact of flooding in the Coogee Bay catchment
Within the Coogee Bay catchment, 531 properties are affected by the 100year ARI flood and 154 properties are flooded above floor level.
There is a significant flood risk in the depression on Rainbow Street. There is no overland discharge point from this location. For large infrequent flooding events the capacity of the 1.05m pipe draining the depression will be exceeded and significant flooding occurs. For the 100year ARI, seven properties are flooded with a water depth of more than 1 metre and for the Probable Maximum Flood (PMF), 65 properties will experience a water depth between 2m and 7m, 13 properties will experience a water depth between 1m and 2m.
A survey of floor levels was undertaken as part of the study. The floor levels were then assessed against the flood levels across the full range of storm events. This allowed the calculation of an estimate for the cost of the average annual damages due to flooding within the catchment.
Key options to reduce the risk and the impact of flooding to the communities are presented hereafter.
Seventeen mitigation options were investigated including detention basins, levees and drainage upgrades. Four options were identified for detailed assessment including adding pits in the upper Dolphin Street area and on Abbot Street, constructing a detention basin at Bardon Park and upgrading the trunk drainage line discharging from the Coogee oval. All options were found to have poor benefit cost ratios except for the one in the upper Dolphin Street area. This option has a cost ratio greater than one. It consists of the addition of inlet pits along Clyde Street, along the flowpath between Dolphin Street and Coogee Street, and along Courland Street (option FM1).
The report recommends that Option
FM1 be investigated further based on the potential benefits to the community
and reduction in flood levels.
It should be noted that potential flood modification measures were identified and evaluated for the Rainbow Street depression. Due to the unique nature of flooding at this location and the need for more detailed background information (e.g. geotechnical data), further assessment of flood risk management at this location is not feasible within the scope of the FRMSP.
The report recommends that the Rainbow Street Detailed Investigation (FM16) be investigated further due to the high hazard and significant flood risk present at this location.
Property Modification options
Property modification measures are considered in cases where it is not possible to mitigate the flood level. The aim of property modification measures is to reduce or eliminate the risk to people and costs associated with flooding.
Typical property modification measures include house raising, voluntary purchase and flood proofing. House raising is only viable in sparsely populated catchments with certain housing designs. The housing density and architectural stock within the Coogee Bay catchment precludes house raising as a viable option.
Equally, property values make voluntary purchase unviable.
The property modification option recommended for the Coogee Bay catchment is to review requirements regarding flood emergency provisions (evacuation or shelter-in-place) to be required to the PMF level.
Response modification options
Response modifications include
flood emergency management, flood warning and evacuation, and community
awareness programmes. The report recommends that:
- Council and SES develop localised evacuation procedures and a detail emergency response plan for Rainbow street;
- Severe weather warnings and thunderstorm warnings should be provided on Council’s website or through the Australian Emergency Alert System;
- Implement flood warning signage at key location where significant flooding can occur;
- Council produce a Local FloodSafe brochure in collaboration with SES;
- Council and SES undertake regular community awareness campaigns and school education program.
Planning and development control measures
The Flood Planning Area (FPA) is used to identify properties which are subject to flood related development controls in the event of future development. The NSW Government’s Floodplain Development Manual typically defines the FPA by the 100 year ARI flood level + 0.5m freeboard. This approach is currently in place for properties within the Coogee Bay catchment.
An analysis of the flooding characteristics within the catchment has identified that the use of 0.5m freeboard is appropriate. However due to the urban flood behaviour as opposed to riverine flooding, it is recommended to trim the flood extents based on the 100 year ARI event where depths are less than 150mm and flood affected area is less than 100m2 prior to adding the freeboard. There are 741 properties within the catchment that meet this set of criteria. For comparison, there are currently 1,033 properties tagged when this depth/area criteria is not applied.
Should this approach be adopted, then property tagging will require amendment so that S149 certificates can be accurately issued based on this reduced number of affected properties.
A further recommendation is that Council could also investigate options to allow residents to request flooding information for their property through Council’s website.
Once properties are tagged, controls would be put in place to ensure that new developments place the habitable floor level above the level of the flood. The Flood Planning Level (FPL) can vary depending on the use and vulnerability of the building/development to flooding. It is recommended that the controls that currently exist within Section B8 of the DCP apply to developments within the Coogee Bay Catchment.
Relationship to City Plan
The relationship with the City Plan is as follows:
Outcome 6: A Liveable City.
Direction 6a: Our public assets are planned, managed and funded to meet the community expectations and defined levels of service.
Financial impact statement
Funding is available in this year’s budget to complete the Coogee Bay Floodplain Risk Management Study and Plan. Two thirds of the funding is available through grant funding from the NSW Office of Environment and Heritage, with the remainder coming from Council funds in line with the conditions of the grant.
The Draft Coogee Bay Floodplain Risk Management Study and Plan has been developed. The Coogee Bay Floodplain Management Committee considers the Floodplain Risk Management Study and Plan to be ready to be placed on public exhibition.
a) the Draft Coogee Bay Floodplain Risk Management Study and Plan be placed on public exhibition for 28 days.
b) a workshop to receive community feedback be organised.
c) Council officers report back to Council on the outcomes of the public consultation.
Minutes of the Coogee Bay Floodplain Management Committee Meeting held on 4 April 2016
Works Report No. W14/16
Subject: Sports Committee Meeting Minutes
Folder No: F2005/00446
The Sports Committee Minutes for the meeting held on 18 May 2016 in the Matraville Room, Randwick City Council Depot, 192 Storey Street, Maroubra are presented at the Council Community Committee.
As scheduled, the Sports Committee has met and the minutes of the meeting, which reflects discussions and outcomes, are attached.
Relationship to City Plan
The relationship with the City Plan is as follows:
Outcome 5: Excellence in Recreation and Lifestyle Opportunities.
Direction 5a: Maximise opportunities for residents and visitors to enjoy both active and passive open space uses.
Financial impact statement
There is no direct financial impact for this matter.
It is recommended that Council acknowledges and accepts the minutes of the attached Sports Committee.
That the minutes of the Sports Committee Meeting held on 18 May 2016 be received and noted.
Randwick City Council Sports Committee Minutes – 18 May 2016