Works Committee Meeting

 

  BUSINESS PAPER

 

 

 

 

 

 

 

 

 

 

 

Tuesday 9 February 2010

 

 

 

 

 

 

 

 

Administrative Centre 30 Frances Street Randwick 2031

Telephone: 02 9399 0999 or

1300 722 542 (for Sydney metropolitan area)

Fax:02 9319 1510

general.manager@randwick.nsw.gov.au

www.randwick.nsw.gov.au


 

 

 

 

 

 

 

 

 

 

 

 


Works Committee

9 February 2010

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Works Committee Meeting

 

Notice is hereby given that a Works Committee Meeting of the Council of the City of Randwick will be held in the Council Chamber, Town Hall, 90 Avoca Street, Randwick, on Tuesday, 9 February 2010 at 6:00pm.

 

Committee Members:           The Mayor, J Procopiadis, Andrews, Belleli, Bowen, Hughes, Matson, Matthews (Chairperson), Nash, Notley-Smith, Seng, Smith, Stevenson, Tracey, White (Deputy Chairperson) & Woodsmith

 

Quorum:                           Eight (8) members.

 

NOTE:    At the Extraordinary Meeting held on 28 September 2004, the Council resolved that the Works Committee be constituted as a committee with full delegation to determine matters on the agenda.

 

Apologies/Granting of Leave of Absences 

Confirmation of the Minutes

Works Committee Meeting - 1 December 2009

Declarations of Pecuniary and Non-Pecuniary Interests

Address of Committee by Members of the Public

Urgent Business

Works Reports

W1/10       Council Owned Decusscarpus Falcatus (Yellowwood) growing outside 339 Bunnerong Road, Maroubra

W2/10       Transport Related Projects

W3/10       Council-owned  Cinnamomum camphora (Camphor laurel) outside 41 Dans Avenue, Coogee

W4/10       Road Safety Steering Committee Meeting Minutes November 2009

W5/10       Bundock Street - Drainage Upgrade    

Notice of Rescission Motions

Nil

…………………………………………………….

Ray Brownlee

General Manager


Works Committee

9 February 2010

 

 

 

Works Report No. W1/10

 

 

Subject:                  Council Owned Decusscarpus Falcatus (Yellowwood) growing outside 339 Bunnerong Road, Maroubra

Folder No:                   F2004/07359

Author:                   Bryan Bourke, Tree Management Officer     

 

Introduction

 

The owner of 339 Bunnerong Road, Maroubra has written to Council requesting the removal of a large and significant Council-owned Decussocarpus falcatus (Yellow wood) growing on the nature strip outside the property.

 

Issues

 

The roots of this tree have caused ongoing damage to the surrounding footpath, kerb and gutter and the brick fence at the front of the property over a protracted period of time.

 

The owner states in his correspondence that roots have now begun to crack the front entranceway to his residence as well as causing cracking to the floor and walls in the sunroom at the front of the residence.

 

The subject tree is in excellent health and is approximately 18 metres tall with a canopy spread of 16-18 metres. It is one of a number of established mature trees of the same species growing along this section of the eastern side of Bunnerong Road, Maroubra. It has important amenity and habitat value.

 

The tree has been regularly root pruned in an attempt to minimise damage to public infrastructure but tree roots have simply grown back and continued to cause damage.

 

The subject tree has been assessed as having a moderate risk potential. It has also been assessed as having a moderate hazard rating when issues such as failure potential, target rating and the size of any potential branch failures are considered.

 

It has been acknowledged as having high scenic/environmental amenity and as providing important habitat/food source. Conversely, the effect of removal on soil stability/land degradation would be negligible.

 

This tree has been assessed by a Council tree officer as having an amenity value of $7,200 using the Standards Australia AS – DR99307 valuation guide.

 

Relationship to City Plan

 

The relationship with the City Plan is as follows:

 

Outcome 10       A Healthy Environment.

Direction 10b:     Environmental risks and impacts are strategically managed.

 

Financial impact statement

 

The total cost to remove and stump grind the subject tree and to re-instate the nature strip, footpath and surrounding infrastructure would be approximately $3,000. The funds would come from Council’s annual tree management budget. There would also be a cost of $500 to replant several super-advanced tree species to replace this tree if it were removed.

 

Conclusion

 

The roots of this tree have a history of causing damage to surrounding public infrastructure, have travelled into the adjacent property and damaged the front brick fence/retaining wall. The roots have also undermined the front yard pavers, cracked tiles in the front entranceway and sunroom area.

 

Council’s Tree Gang has severed tree roots on the western side of the subject tree on a number of occasions to facilitate footpath repairs but this is only ever a temporary solution to that particular problem.

 

The installation of a tree root barrier is not a feasible option because it could compromise the stability of the tree and adversely impact upon its long term health. Any such barrier would only be a temporary solution to a small number of the problems associated with the tree and eventually tree roots would simply grow over or under any such barrier.

 

The only effective long-term solution to dealing with the range of problems being caused by the roots of this tree would be to remove it completely and replace it with several more appropriate tree species.

 

Recommendation

 

That:

 

a)     approval be granted to remove the large Council-owned Decussocarpus falcatus (Yellowwood) growing on the nature strip outside 339 Bunnerong Road, Maroubra; and

 

b)     it be replaced with several more appropriate tree species as nominated in Council’s Street Tree Masterplan.

 

Attachment/s:

 

1.View

Series of photographs detailing the size of the Decussocarpus falcatus (Yellowwood) outside 339 Bunnerong Road and the range of damage being caused by its roots.

 

 

 

 


Series of photographs detailing the size of the Decussocarpus falcatus (Yellowwood) outside 339 Bunnerong Road and the range of damage being caused by its roots.

Attachment 1

 

 

Yellowwood is extremely prominent in the Bunnerong Road streetscape

 

A large proportion of the canopy overhangs into the front of the adjacent property


Roots have severely undermined and cracked recently constructed section of footpath

 

Front brick rendered fence has been cracked by street tree roots


Large crack extending down through length of front brick fence/retaining wall

 

Entranceway tiles have been cracked by street tree roots

Cracking extends into tiled area in front sunroom/lounge 

 

Hairline cracking runs through a large area of tiling inside front sunroom


Works Committee

9 February 2010

 

 

 

Works Report No. W2/10

 

 

Subject:                  Transport Related Projects

Folder No:                   F2004/07359

Author:                   Tony Lehmann, Manager Integrated Transport     

 

Introduction

 

In 2008 Council submitted to the Roads and Traffic Authority (RTA) an application for Black Spot funding to construct, in the 2009-10 year, a roundabout at the intersection of Dudley Street and Arden Street, Coogee.   As part of Council’s 2009-10 budget process funds were allocated to assist with the co-funding of this project.

 

Unfortunately the submission was not successful and no RTA funding was forthcoming.  In order to move forward with the project it is suggested that part of the Council funding originally allocated be utilised to undertake the investigation and design processes of the project.  The completion of these processes will result in a clearer understanding of the final costs of the project, indicating whether Council can proceed with the project at this time from the existing budget.

 

Also, having a fully designed project could assist with applications which Council may make for future funding programs.

 

Relationship to City Plan

 

The relationship with the City Plan is as follows:

 

Outcome 9:       Integrated and Accessible Transport.

Direction 9d:      Residential amenity is protected by appropriate traffic management.

 

Financial impact statement

 

There is no direct financial impact for this matter as these funds had already been allocated for the 2009-10 year.

 

Conclusion

 

It is proposed that Council’s budget amount, originally allocated to co-fund the Arden Street/ Dudley Street roundabout project, be reallocated to wholly fund the required survey and design of the roundabout.  If this process reveals that the project can be covered by the currently allocated funding, it is suggested that the Council then proceed with the project.

 

Recommendation

 

That:

 

a)     Council reallocate the sum of $135,000, included in Council’s 2009-10 Capital Works Program Budget for the co-funding of the Arden Street/Dudley Street roundabout project, to the survey and design of the roundabout; and

 

b)     If the survey and design process results in a construction cost estimate less than the then remaining funds, the roundabout be constructed utilising these funds.

 

Attachment/s:

 

Nil

 

 


Works Committee

9 February 2010

 

 

 

Works Report No. W3/10

 

 

Subject:                  Council-owned  Cinnamomum camphora (Camphor laurel) outside 41 Dans Avenue, Coogee

Folder No:                   F2004/07359

Author:                   Bryan Bourke, Tree Management Officer     

 

Introduction

 

The owners of 41 Dans Avenue, Coogee have written to Council requesting the removal and replacement of a large Council-owned Cinnamomum camphora (Camphor laurel) growing on the nature strip outside their property. 

 

Issues

 

The subject tree is approximately 18 metres tall with a canopy spread of around 18 metres. It is in fair condition and contributes significant visual amenity to the streetscape of Dans Avenue.

 

The roots have damaged the adjacent footpath and this has had to be repaired on a number of occasions. Roots have also severely damaged a section of kerb and gutter and this will require replacement.

 

The canopy has had to be regularly pruned away from overhead powerlines and service wires and the canopy itself is overhanging the adjacent property to a significant degree.

 

Inspection of the canopy reveals that there is considerable epicormic growth along all branches. This is an indication that the tree is under stress. There is also noticeable deadwood within the canopy, particularly on branch tips.

 

The owners of 39 Dans Avenue, Coogee have written to Council supporting the tree’s removal and replacement with a more appropriate tree species. They also advise that roots from the tree are undermining their front fence and intruding into their property.

 

Relationship to City Plan

 

The relationship with the City Plan is as follows:

 

Outcome 10:      A Healthy Environment.

Direction 10b:    Environmental risks and impacts are strategically managed.

 

Financial impact statement

 

The total cost to remove and stump grind the subject tree, including reinstating the nature strip, footpath and surrounding infrastructure would be approximately $3,000. This would come from Council’s annual tree management budget. There would also be a cost to replant one-two super-advanced tree species to replace this tree if it were removed.

 

 

 

 

Conclusion

 

The Camphor laurel street tree outside 41 Dans Avenue is a mature specimen that is significant in the streetscape and provides important habitat for birdlife and other fauna.

 

This species is not native to Australia. The roots of this particular tree are large and extend over a broad area into adjacent private property. The canopy has to be regularly pruned away from powerlines and service wires as well as an adjacent street light.

 

Excavation and trenching reveals a significant amount of tree root material growing into the adjacent property and it could be safely assumed that a similar amount of root material would be growing into the property at 39 Dans Avenue. There is also evidence of movement to the front brick fence of the property at 41 Dans Avenue that may have been caused by the roots of this tree.

 

The subject tree has been assessed as having high scenic value. Because of the damage being caused by its roots, the impact of removal on land degradation would be negligible.

 

Using Australian Standard ASDR99307 it has been calculated that the tree has an amenity value of only $2,700. This very low amount is primarily due to its inappropriateness as a street tree species and the fact that its roots are causing regular and ongoing damage to both public infrastructure and private property which is now directly impacting on the lives of adjacent property owners.

 

It has been calculated that the tree has a moderate hazard rating but this will increase as the tree ages and declines further in health.

 

A report by Council’s Tree Gang recommends the removal of the tree and its replacement with a more appropriate species. Because of the amount and range of root material involved it would not be possible to root prune the tree or to install an effective tree root barrier. Arboricultural industry practice accepts that root pruning should only be undertaken where the total amount to be root pruned on any tree is determined to be less than twenty (20) percent of the Critical Root Zone area. In this case the required amount would definitely exceed that limit. If root pruning were to be undertaken it would have a very detrimental effect on the safety and long-term viability of the tree.

 

Therefore, the only practical and cost effective long-term management option that would deal with the ongoing root problems associated with this tree would be its removal and replacement.

 

Recommendation

 

That the Council-owned Cinnamomum camphora (Camphor laurel) growing on the nature strip outside 41 Dans Avenue, Coogee be removed and replaced with a more appropriate species – as nominated in Council’s Street Tree Masterplan.

 

Attachment/s:

 

1.View

Series of photographs detailing the significance of the Camphor laurel in the streetscape as well as the damage being caused by its roots.

 

 

 

 


Series of photographs detailing the significance of the Camphor laurel in the streetscape as well as the damage being caused by its roots.

Attachment 1

 

 

Canopy pruned around powerlines and extending well into property – note epicormics

 

Tree provides important visual amenity in the Dans Ave streetscape

Canopy has to be regularly pruned around powerlines and service wires and away from adjacent street light

 

Canopy has significant deadwood and epicormic growth throughout

Tree roots have damaged and buckled kerb and gutter and roadway

 

Large tree roots are growing across nature strip and under footpath and front fences


Trench along front of property shows significant tree root intrusion into property

Front fence of adjacent property has been dislodged – possibly by tree roots

 

 

 


Works Committee

9 February 2010

 

 

 

Works Report No. W4/10

 

 

Subject:                  Road Safety Steering Committee Meeting Minutes November 2009

Folder No:                   F2010/00008

Author:                   Heidi Leadley, Community Road Safety Officer       

 

Introduction

 

The Road Safety Steering Committee was established in November 2005 to provide the Community Road Safety Officer with strategic direction and a forum to discuss road safety projects.

 

Issues

 

The attached minutes are from the meeting held on 25 November 2009.

 

Relationship to City Plan

 

The relationship with the City Plan is as follows:

 

Outcome 6:   A liveable City.

Direction 6c:  The safety of our community is paramount and is acknowledged and supported through proactive policies, programmes and strategies.

 

Financial impact statement

 

There is no direct financial impact for this matter.

 

Conclusion

 

In conclusion, the minutes are an accurate reflection of the discussions of the Road Safety Steering Committee meeting.

 

Recommendation

 

That the minutes from the Road Safety Steering Committee held on the 25 November 2009 be received and noted.

 

Attachment/s:

 

1.View

Minutes from the Road Safety Steering Committee meeting in November 2009

 

 

 

 


Minutes from the Road Safety Steering Committee meeting in November 2009

Attachment 1

 

 

Road Safety Steering Committee

Meeting Minutes

 

Wednesday, 25 November 2009

8:00am

 

Kensington Room

Administrative Centre

Randwick City Council

30 Frances Street

Randwick  NSW  2031

 

Present (in alphabetical order)

Anthony Andrews, Councillor , RCC

Janine Bourke, Coordinator Ranger Services, RCC

Sandra Coppe, Road Safety Education Consultant, DET

Margaret Egan, Road User Safety Officer, RTA

Jane Frankland, Supervisor Ranger Services, RCC

Sgt Karen Griffiths, Traffic, Maroubra LAC

Avril Jeans, Community Project Officer (Youth), RCC

Heidi Leadley, Community Road Safety Officer, RCC

Tony Lehmann, Manager Integrated Transport, RCC

 

Matters arising from the minutes of the previous meeting

26 August 2009

There were no issues raised from the minutes of the previous meeting.

 

2009 – 2010 Action Plan

School Safe

Heidi distributed the Safety Around Schools brochures to the committee and asked for feedback on the information that has been included in them.  The information needs updating and possibly including into one brochure.  These are sent to schools at the beginning of the new school year.  Margaret Egan advised that other RSO’s do something similar and will forward copies for review.

 

The No Stopping means No Stopping campaign (large corflute posters that are attached to school fences) was rolled out to schools at the beginning of the term and there seems to have been a good take up of program.  Generally feedback has been positive.

 

Pumpkin Bus

The Pumpkin late night bus was the subject of a Council meeting the previous evening and Councillor Andrews reported the resolution of the Council was to request support from the Office of Liquor Gaming and Racing for their application to require the venues to fund the service for two nights / week.  If this support is not forthcoming, Council discussed that it would not fund the service for the rest of the year.

 

LOOK

The LOOK stencils are being included in the pedestrian crossing audit throughout Randwick City.  Each crossing that has not previously had LOOK stencilling, will now have LOOK markings included as part of the upgrade of all pedestrian crossings throughout the City.

 

 

 

SLOW DOWN in local streets

Heidi explained that this project was underway, with a VMS radar currently located on Dangar Street, Randwick.  The next streets to receive the VMS would be Storey Street, South Coogee  and Eastern Avenue at Kingsford.  This would take the project up to Christmas.

 

There was some discussion about the process for support from the local police, and the speed count information is passed on to Police if enforcement is seen as necessary.

 

Sgt Karen Griffiths spoke to the committee about some of the police & highway patrol operations that a currently being run in the area.

 

Child restraints checking day

The restraint checking day was held on 4 November 2009.  The day was considered successful despite the rain, with over 35 cars attending the day.  Only 2 vehicles had properly fitted restraints, that did not need modifications of any kind.  It is likely that a second restraint checking day will be held in March 2010.

 

Discussion about other projects

Young Driver Education Program

Avril Jeans, spoke about the Young Driver Education Program that was approved by Council on 10 November, 2009.  This project will target 10 disadvantaged youth in the local area and will assist them through provision of paid driving lessons, support if there are problems with licences or possible existing penalties.  There may be the opportunity to continue with the development of a mentor program.

 

Council Driver Awareness Training & Youthsafe Presentation

Heidi advised the group that she would be presenting a component (shifting attitudes and road rules) of Council’s Driver Awareness Training to depot staff over the next two weeks.

 

Heidi will also be presenting at the Youthsafe Alternative transport forum on Thursday 26 November, 2009.  The presentation will focus on planning for alternative transport.

 

General Business

Sandra Coppe explained that she has been rolling out information and resources from the RTA specifically Kindy orientation packs.  She has been recommending that Principals undertake these sessions with Parents as part of the orientation program.

 

Sandra also advised that she will be looking after two regions for the new year and will be focused on Northern Sydney region until July 2010. 

 

Meetings for 2010

17 March 2010 – Invitations, reminders and agenda will be distributed closer to the date.

21 July 2010

17 November 2010

 

Meeting close

The meeting closed at 8:45am

 

 

 


Works Committee

9 February 2010

 

 

 

Works Report No. W5/10

 

 

Subject:                  Bundock Street - Drainage Upgrade

Folder No:                   F2009/00044

Author:                   Joe Ingegneri, Co-ordinator Engineering Services     

 

Introduction

 

Council has received numerous complaints, including a claim for damages, relating to flooding of the property at 101 Bundock Street, Randwick. 

 

The property was constructed as part of the Mirvac development of Stage 1A of the former defence site.  101 Bundock Street is located at the west most point of the Mirvac Development.  This location is adjacent to the lowest point in Bundock Street.

 

 

The existing underground drainage system has limited capacity that is exceeded in relatively small rain events.  This results in water surcharge and ponding in Bundock Street before it flows overland through the former defence site. 

 

Due to the ground levels, there have been several instances where the level of water ponding has exceeded the boundary levels of 101 Bundock Street and water has entered the garage.

 

This report details the drainage works proposed to mitigate the flooding impacts on Bundock Street.

 


Issues

 

Background

The Randwick Defence site was the subject of a Masterplan for staged development and a Development Control Plan setting design/development standards. The approval process for the Bundock Street Department of Defence development site has extended over a period of approximately nine (9) years to date.

 

A development application for Stage 1A of the development site was lodged and approved (DA 472/2002).  The DA comprised 13 “super” residential allotments, and land to be dedicated to Council as public road in surplus Defence land bounded by Bundock Street, Avoca Street and Holmes Street, Randwick. The applicant also proposed to construct road, stormwater drainage and other civil works over the land to be dedicated to Council as public road.

 

Stage 1A of the Department of Defence site contains the land on which 101 Bundock Street is now located. The subject dwelling is the western most of the 4 bedroom dwellings constructed under the consent for Stage 1A.

 

A development application for Stages 2 and 3 of the development site was lodged and approved, DA 62/2003.  This DA was for subdivision of land into 34 lots for the purpose of future residential development, open space and public roads; associated subdivision works including construction of streets, provision of utility services, earthworks and landscaping.  Stages 2 and 3 are generally those areas immediately west of Stage 1A. No construction certificate application has been lodged for works within Stages 2 and 3 and the development consent issued for Stages 2 and 3 has now lapsed.

 

Drainage Infrastructure in the DA approvals

The Construction Certificate for Stage 1A civil infrastructure works makes reference to drainage construction works in Bundock Street and that part of the Department of Defence site immediately west of 101 Bundock Street. In issuing the Construction Certificate plan 4399-S125 Issue D, this plan clearly shows details for draining the low point of Bundock Street.

 

To facilitate an early release of the Plan of Subdivision for Stage 1A, certain civil infrastructure construction works associated with the Stage 1A development were deferred such that they could be undertaken following completion of construction works within the Stage 1A site.

 

The Development Application 679/2003 was assessed on the basis that the assessing officers believed the low point/sag point in Bundock Street would be adequately drained, thereby minimising any potential for inundation of 101 Bundock Street.

 

The Construction Certificate for the dwelling on 101 Bundock Street relies on interallotment drainage at the rear of the property (draining in an east west direction). This interallotment drainage was developed on the basis that it would connect into a new stormwater pipeline to be constructed immediately to the west of 101 Bundock Street.

 

Nearing completion of the dwelling at 101 Bundock Street both Mirvac (the developer of Stage 1A dwellings) and Council were made fully aware that no stormwater drainage upgrade in Bundock Street was included in the Stage 1A approval to drain the low point/sag point located immediately west of 101 Bundock Street.

 

The internal driveway serving 101 Bundock Street was redesigned to incorporate a raised section near the Bundock Street property alignment. A section of kerb on the southern side of Bundock Street (immediately west of the low point) was “cut down” and an overland flow path into Defence land was created across the nature strip.  Mirvac negotiated a deed of agreement with the Department of Defence to allow their private stormwater to discharge from the interallotment stormwater pipeline into Defence land as overland flow. Council reaffirmed its rights to use existing drainage infrastructure and overland flow paths within the defence site.

 

101 Bundock Street – Flooding

The storm event of 2 May 2009 produced flows to the low point far in excess of the underground drainage system.  This resulted in water ponding across the road and reaching levels higher than the high point of the driveway at 101 Bundock Street. The water entered and flooded the garage and storage areas.

 

Council is in receipt of a letter from Swaab Attorneys regarding flooding of the property at 101 Bundock Street. The letter states that the subject site “has been subjected to extreme flooding on three separate occasions over the last 18 months.” The dates given for these incidents are mid April 2007, 4 April 2009 and 2 May 2009.

 

Existing Drainage Infrastructure

The existing drainage of the Bundock Street low point relies on two kerb inlet sag pits, an outlet pipe for the southern most sag pit and an informal overland flow path system. The capacity of the overland flow path into Department of Defence land cannot be significantly increased without removal of both large Eucalypts located immediately south of the southern most sag pit.

 

The current drainage system is under capacity based on current design standards.  The flooding impacts did not impact private property prior to the construction of Stage 1A and 101 Bundock Street.

 

Council has undertaken a detailed investigation of the infrastructure in the vicinity of the low point. Council’s records lack any detail on drainage infrastructure within the Department of Defence site and surrounds.

 

The drainage model submitted post approval of the development application for Stage 1A has been reviewed in detail to determine flow volumes arriving at the low point for major storm events.

 

The land immediately west of 101 Bundock Street is Department of Defence land.  This land was originally submitted for redevelopment as Stages 2 and 3.  These stages included drainage infrastructure works.  This approval has now lapsed.

 

The Department of Defence have verbally indicated that any possible action with respect to maintenance/clearing of Defence land and/or upgrading of the drainage system within Defence land will not be considered by the Department of Defence until the land is proposed for redevelopment.

 

Assessment of Options

A model of the existing drainage system has been developed to determine the capacity of the existing underground drainage system and to develop options.  We prepared various options, taking into account the size of the downstream drainage system within Department of Defence land and beyond.  The modelling revealed that increasing the size and number of drainage pipes across Bundock Street will not significantly increase the capacity of the drainage system. This will only achieve a capacity for a 1-2 year Average Recurrence Interval (ARI).  Our model revealed that by changing the levels and increasing capacity of the overland flow path that we could achieve a capacity for a 20 year ARI.

 

The option that we developed entails earthworks to change the levels of the land with Department of Defence land to form an open grassed channel.  This work also includes construction of a concrete apron across the footway and installation of 2 lengths of fence that will not capture leaf and other debris. 

 

For this option to proceed, we need to remove 2 significant Eucalyptus species trees adjacent to the existing low point drainage pit. The base of these trees is significantly higher than the surrounding verge and these trees obviously restrict/partially block the stormwater overland flow path draining from the Bundock Street low point into the Department of Defence site.

 

Our Tree Management Officers were requested to assess the street trees.  The report (attached) concludes that the trees are healthy and contribute positively to the surrounding landscape.  The report states that they should be retained if at all possible.

 

New drainage pipeline

 

 

Discussion

Based on our modelling of the drainage system and land contours, our assessment indicates that the most feasible option to reduce the flooding impacts on 101 Bundock Street is to improve the overland flow path and capacity. It is estimated this work will cost $60,000. We have sought and received permission from the Department of Defence to carry out the proposed open channel works within Department of Defence land. However, the improvements and increase of overland flow path will require removal of 2 significant street trees.  It is proposed to replace these trees with 2 super advanced street trees located west of the overland flow path.

 

Our assessment revealed that the upgrade of the underground drainage network would require extensive construction work and creation of drainage easements costing approximately $500,000.  Therefore, the overland flow option is preferred at this time.

 


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.

Key Action:         Assets are managed strategically to deliver intergenerational equity and to meet Council’s obligation as the custodian of our community’s assets.

 

Financial impact statement

 

Council has the necessary funds available in the 2009-10 Drainage Capital Works Budget for works to increase the capacity of the drainage system draining the low point of Bundock Street.

 

Conclusion

 

The drainage at the low point in Bundock Street , Randwick has limited capacity to cater for moderate rain events.  This has resulted in flooding of the property at 101 Bundock Street. To improve the performance of the drainage at this location, it is proposed to undertake drainage upgrade works to mitigate the flooding impacts at 101 Bundock Street.

 

The proposed option includes construction of a dedicated overland flow next to the 101 Bundock Street that will provide a system capacity of 20 year Average Recurrence Interval.  

 

This option proposed is the only feasible option available. Regrettably, it requires the removal of 2 significant street trees.  It is proposed to replace these street trees with 2 super advanced trees in consultation with the Tree Management section.  

 

Recommendation

 

That:

 

a)     the proposed new concrete apron and open channel within Department of Defence land be undertaken; and

 

b)     the two (2) street trees on the southern side of Bundock Street west of 101 Bundock Street be removed and replaced with 2 super advanced street trees along Bundock Street.

 

Attachment/s:

 

1.View

Street Tree Assessment

 

 

 

 


Street Tree Assessment

Attachment 1