E N V I R O N M E N T , S U S T A I N A B I L I T Y & I N D I G E N O U S A F F A I R S C O M M I T T E E R E P O R T C O V E R S H E E T

Agenda Item 5.2

22 April 2004

DRAINAGE PLAN 2004 – 2009

Division City Assets & Services

Presenter Gordon Duncan, Principal Engineer Infrastructure

Purpose

1. This report presents the draft Drainage Plan 2004 – 2009 for approval.

Background

2. Council’s drainage network consists of approximately 300km of pipes and associated assets (such as drainage pits, pump stations and litter traps). The majority of the drainage infrastructure within the City of Melbourne is over 60 years old; some drains date back to the 1850s.

3. The age of the drainage network places a premium on proactive management. Drainage Plan 2004-2009 establishes a forward plan for the management of Council’s stormwater drainage assets and includes indicative costings for the following five years.

Issues

The Benefits of a Drainage Plan

4. The consequences of failure of drainage assets may include street and property flooding, damage to person or property, disruption to traffic movement and legal liability. The consequences of failing to address stormwater quality issues are decreased environmental and recreational value of receiving waterways.

5. The Drainage Plan recommends the adoption of a risk management approach to the management of the asset. This includes an underground drain inspection program and a forward plan for asset maintenance and replacement. Implementation of the Drainage Plan will reduce flooding due to asset failure and improve the quality of the water being discharged into Melbourne’s waterways.

6. The Drainage Plan sets out a program for converting information on the drainage network to a Geographical Information System (GIS) format. This conversion will allow records of the system to be easily updated, aspects of the network to be hydraulically modelled and the ability to analyse maintenance history and plot flooding events.

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Financial Implications

7. The Drainage Plan recommends the allocation of non-capital funding of $905,000 over five years. Of this amount, $130,000 has been provided in previous years as recurrent budget items and $300,000 is funded through the Civil Infrastructure Services contract. The Plan lists new funding initiatives of $475,000 over a five year budget period. This new funding will be sought through the annual Council and recurrent budget processes. New funding initiatives include adopting a drainage asset information system; developing hydrologic and hydraulic performance data on the drainage network, the development of flood management strategies; and implementing a routine inspection program for underground drains.

8. Funding for the construction and renewal of drainage assets will be sought annually in accordance with the annual Council works program.

Time Frame

9. The Drainage Plan is based on a five year time frame, from 2004 to 2009.

Consultation

10. Consultation has been undertaken with Melbourne Water, the Environment Protection Authority, Moonee Ponds Creek Coordination Committee, CityWide Service Solutions and Montgomery Watson Harza Pty. Ltd.

11. Internal consultation was conducted with Sustainable Asset Management, Environmentally Sustainable Development, Sustainable Policy & Planning, Sustainable Regulatory Services (Building, Certification & Inspection and Development Planning), Parks & Recreation and Corporate Communications.

Finance

12. The Drainage Plan recommends the allocation of funding of $905,000 over five years as detailed above.

Legal

13. No direct legal issues arise from the recommendation in the report. The subject matter of the report and the recommendation are within the functions and powers of the Council.

Sustainability

Connected and Accessible City

14. There is no significant sustainability impact.

Inclusive and Engaging City

15. There is no significant sustainability impact.

Attachments: 1. Drainage Plan 2004 -2009 2. Sustainability Assessment

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Innovative and Vital Business City

16. The Drainage Plan 2004 - 2009 will provide a strategic focus for longer term planning and management of Council's stormwater drainage assets.

Environmentally Responsible City

17. The Drainage Plan recommends new and continued initiatives for improving stormwater quality which will contribute positively to the environmental values of receiving waterways.

Recommendation

18. That the Environment, Sustainability and Indigenous Affairs Committee recommend that Council:

18.1. endorse the draft Drainage Plan 2004 – 2009;

18.2. note that implementation of the Plan will be subject to further budgetary approval in the normal annual cycle; and

18.3. approve publication of the draft Plan as a final version.

Attachment 1 Agenda Item 5.2

Environment, Sustainability and Indigenous Affairs Committee 22 April 2004

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City of Melbourne

Drainage Plan

2004-2009

Drainage Plan 2004-2009 establishes a forward plan for the management of Council’s stormwater drainage assets. It deals specifically with the development and maintenance of the

City’s drainage infrastructure and measures to improve stormwater quality.

March 2004

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Table of Contents

EXECUTIVE SUMMARY 3

INTRODUCTION 4

VISION 5

OBJECTIVES 5

STRATEGIC CONTEXT 6

THE DRAINAGE NETWORK 9

STORMWATER DRAINAGE MANAGEMENT – THE CURRENT PICTURE 12

STORMWATER DRAINAGE MANAGEMENT – THE FUTURE PLAN 18

IMPLEMENTATION & REVIEW 28

IMPLEMENTATION PLAN 29

APPENDIX A - REGULATORY FRAMEWORK 33

APPENDIX B - STORMWATER PUMP STATIONS 35

APPENDIX C - LITTER TRAPS 36

APPENDIX D – STORMWATER POLLUTANTS 38

GLOSSARY OF TERMS 39

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Executive Summary

1. Drainage Plan 2004-2009 is a forward plan for the management of Council’s stormwater drainage assets and provides a baseline of Council’s corporate knowledge. It deals specifically with the development and maintenance of the City’s drainage infrastructure and measures to improve stormwater quality. The Plan sets out strategies to ensure that Council’s drainage assets are maintained in a manner consistent with national engineering standards and community expectations.

2. The actions within the Drainage Plan address the potential consequences of failure or collapse of drainage assets. Consequences may include street and property flooding, damage to property, personal injury and/or death, disruption to traffic movement and legal liability.

3. The consequences of not undertaking measures to reduce contaminants in stormwater may include damage to aquatic life and decreased environmental and recreational value of waterways. Pollution abatement notices may be issued under the Environment Protection Act.

4. The Drainage Plan supersedes the "Drainage Strategy, 1999" and the "Stormwater Management Plan, 2000". These documents are now considered defunct. The Drainage Plan provides a consolidated and updated account of Council’s management of stormwater in relation to drainage infrastructure and measures to protect stormwater quality.

5. Major initiatives addressed by the Drainage Plan include measures to gain a greater appreciation of current drainage asset condition, planning for asset improvements based on a risk based approach and an ongoing routine underground drain inspection program.

6. The provision of a drainage asset information system is a cornerstone to drainage works. Benefits would include assisting with strategic planning, risk management, access to depreciation information, analysing maintenance history and flooding events and access to reliable and accurate information for staff and customers.

7. Measures to improve stormwater quality are multi-faceted involving the installation and ongoing maintenance of infrastructure (such as litter traps), education programs for schools, residents and businesses and compliance activities.

8. The Plan outlines the importance of measuring the effectiveness of the actions and proposes methods for continual monitoring of the success of the plan. This will act as a feedback loop in the planning process and provide avenues to amend actions if outcomes are not being achieved.

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Introduction

9. The City of Melbourne has an area of 36.5 square kilometres and supports a residential population of 57,200 (2001), increasing to a daytime business, working and visiting population of 567,000. It supports Melbourne’s largest commercial and retail centre (the Central Business District), industrial precincts and a number of established residential and mixed use areas (Refer Figure 1).

10. The City of Melbourne supports a diverse range of land uses reflecting historic and ongoing development activities. The City has a built up floor area of nearly 26 million square metres, of which office, transport/storage and residential uses are most prominent. Open spaces account for nearly 15 million square metres, consisting largely of parkland and outdoor formal recreational space.

11. Council’s drainage network consists of approximately 300km of pipes and associated assets, utilised to convey stormwater from roads, parks, footpaths and property to receiving waterways, Melbourne Water main drains or adjacent municipalities. The majority of the drainage infrastructure within the City of Melbourne is over 60 years old, but some drains date back to the 1850s.

Figure 1 – City of Melbourne Key Features

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Vision

12. To manage stormwater drainage infrastructure in a manner which protects private property and public infrastructure from flooding and provides for clean stormwater discharge to receiving waterways.

Objectives 13. Improve the drainage network through installation and upgrade of new infrastructure.

14. Provide for the environmentally sound management of stormwater drainage, incorporating water sensitive urban design principles.

15. Optimise the performance of the drainage network by introducing higher levels of inspection, analysis and maintenance programs.

16. Improve the quality of stormwater discharge to minimise adverse impacts to the receiving waterways.

17. Increase community awareness of stormwater management issues.

18. Improve compilation and accessibility of stormwater asset information.

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Strategic Context

City Plan 2010 19. City Plan 2010 is Melbourne City Council’s primary planning strategy. It sets out what

Council believes must happen over the next 10 years to achieve the vision for the city of Melbourne in 2010 to be a thriving and sustainable city.

20. City Plan guides decision making for the development of Melbourne’s assets and includes the following relevant strategies:

20.1 Create and maintain agency partnerships to manage the quality of the City’s air and water,

20.2 Improve the management of the City’s water cycle and enhance the water quality within the City,

20.3 Enhance the environmental values of Melbourne’s parklands, the Yarra and Maribyrnong Rivers and Moonee Ponds Creek,

20.4 Promote the protection of the City’s natural land systems and waterways through agency and community partnerships, information and activities,

20.5 Protect and enhance the natural capital of the Yarra River.

Draft Total Watermark 2004 21. The City of Melbourne’s total water management strategy known as ‘Draft Total Watermark’

brings together water consumption targets1 and addresses stormwater, wastewater and groundwater management and their effects on Melbourne’s waterways in a coordinated and innovative manner and as a part of the total water cycle.

22. The strategy seeks an approach to stormwater management whereby flows should be minimised, resources captured and potential impacts on receiving waters minimised by involving clever design, implementation and community involvement.

23. The Drainage Plan is integrated with Draft Total Watermark as a core policy document for achieving the objectives of Draft Total Watermark.

City Of Melbourne responsibilities 24. The City of Melbourne has responsibility for land-use and development planning, land and

stormwater management. In its role as the local drainage authority, Council is responsible for the management of the local (public) drainage system. This responsibility includes maintenance of the system, assessment of land-use and development applications, administration and enforcement of local laws and emergency management. Council’s organisational structure contains six divisions of which three have direct responsibility for stormwater management:

25. City Assets and Services Division manages civil and environmental infrastructure (such as public spaces, roads, parks and drainage). It provides a range of services and specific programs, such as community education, recreation services and waste management. In relation to stormwater management, the Division is responsible for the provision and maintenance of stormwater drainage assets and the administration of legislative requirements and local laws (eg. Environment Local Law).

1 as set out in ‘Watermark’, (June 2003)

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26. Sustainable Development and Strategy Division is responsible for facilitating and managing the sustainable development of the City of Melbourne. This involves preparing strategic city, community and corporate plans, administering local laws and monitoring city performance. The Division is responsible for administering the Planning and Environment Act 1987, Building Act, Building Regulations, the Health Act and the Activities Local Law.

27. City Projects, Arts and Culture Division is responsible for ensuring Council adopts an integrated approach to design and management of public spaces.

Government responsibilities 28. Melbourne Water as the Regional Drainage Authority and Flood Plain Management

Authority for the Greater Melbourne area, is responsible for regional drainage, flood protection and waterway management. This involves the management of all gazetted main drains (generally declared main drains have catchments greater than 60 hectares) and waterways and controlling developments within designated flood zones. This responsibility extends to drainage assets associated with these systems including levees, weirs, and riverbanks to the high water line. Agreements with other organisations may govern the management of some of these assets.

29. The Environment Protection Authority (EPA) is responsible for the protection of the quality of Victoria’s environment by application of the statutory powers described in the Environment Protection Act 1970. EPA has been responsible for the administration of the Victorian Stormwater Action Program, a three year, $22.5 million grants program established in June 2000 which aimed to improve the environmental quality of Victoria’s waterways through better management of urban stormwater.

30. VicRoads is responsible for stormwater drainage associated with the road pavements on Main Roads, State Highways and Freeways. These drains generally discharge into Council’s system or Melbourne Water’s system.

31. VicTrack is responsible for stormwater drainage of tram tracks and railway land. These drains generally discharge into Council’s system or Melbourne Water’s system. VicTrack also controls the land encompassing tram tracks and rail yards that Council has licensed culverts traversing.

32. The Port of Melbourne Corporation is responsible for drainage management of land under its jurisdiction. The Port of Melbourne Corporation have a licence agreement with the Council covering the numerous Council drains that cross its land and discharge into the Yarra River.

33. Local Government. The Cities of Yarra, Port Phillip, Stonnington, Moreland, Hobsons Bay, Moonee Valley and Maribyrnong border the City of Melbourne. These municipalities have the same level of responsibility for their infrastructure as Melbourne. In most cases the City of Melbourne discharges and/or receives stormwater from these adjacent municipalities.

Private Sector 34. Owners and operators in the private sector are responsible for the legal discharge of

stormwater from their properties

35. Transurban Group as the owner and operator of CityLink is responsible for stormwater drainage associated with its roadways, tunnels and bridges.

Regulatory Framework A regulatory framework exists to guide drainage design, planning and management and to manage and protect stormwater quality. A summary of the regulatory framework which applies to the City of Melbourne is provided in Appendix A.

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Previous Drainage Strategies 36. Drainage Plan 2004-2009 combines and revises the objectives of both the Drainage

Strategy 1999 and the Stormwater Management Plan 2000.

37. The purpose of the Drainage Strategy 1999 was to provide the City of Melbourne with a decision-making framework to address existing and future needs for stormwater drainage. The Drainage Strategy outlined engineering actions for the design, installation and maintenance of stormwater drainage facilities.

38. The City of Melbourne introduced its first Stormwater Management Plan in 2000. The plan was developed as part of a broader State Government funding commitment (through Melbourne Water, the EPA and the Municipal Association of Victoria) in support of the development of Stormwater Management Plans for all local authorities in the Melbourne metropolitan area. Actions complete undertaken include:

38.1 installation of gross pollutant traps for the trapping of sediment and litter;

38.2 development of plans to improve the Dynon Rd stormwater canal;

38.3 a partnership project with RMIT University for rainwater harvesting and recycled water use;

38.4 installation of rainwater tanks at City of Melbourne childcare centres; and

38.5 Implementation of the Environment Local Law and Activities Local Law, which contain environmental requirements for residential and commercial premises.

The Victorian Stormwater Action Program, Melbourne Water and the City of Melbourne jointly funded many of these projects.

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The Drainage Network

39. Council’s drainage network consists of approximately 300km of pipes and associated assets, utilised to convey stormwater from roads, parks, footpaths and property to receiving waterways, Melbourne Water main drains or adjacent municipalities. The majority of the drainage infrastructure within the City of Melbourne is over 60 years old, but some drains date back to the 1850’s. This Chapter provides an overview of the City of Melbourne’s current drainage assets.

40. Pipes and culverts located underground that range in size from 225mm diameter to greater than 1200mm diameter, depending on flow requirements. Pipes and culverts vary in age; some are over 100 years old. There has been a wide range of materials used to construct pipes and culverts, including brick, earthenware, reinforced concrete, fibre reinforced concrete, cast iron and unplasticised polyvinyl chloride (uPVC). Council’s current standard for stormwater pipes is 300mm diameter reinforced concrete. A history of pipes used within the City of Melbourne is summarised in Table 1.

Table 1 History of Pipes and Culverts

Pipe Size Installation period

Earthenware 225mm to 450mm diameter Installed from 1850’s

Brick barrel Mostly greater than 600mm diameter.

Installed between 1886 to ~1920

Reinforced concrete Mostly greater than 300mm diameter.

Installed from ~1920 onwards

Fibre reinforced concrete 225mm to 750mm diameter Predominantly post 1980

Cast iron 150mm to 450mm diameter Installed between ~1880 to1940 (used rarely)

Unplasticised polyvinyl chloride (uPVC)

150mm to 300mm diameter Predominantly post 1980 (used rarely)

41. Open channels (such as kerb and channel, centre channels in lanes and grassed swales) collect surface stormwater and direct the flow by gravity to stormwater entry pits or direct flow to receiving waterways. Kerb and channel and centre channels are constructed of bluestone, concrete cast in-situ or pre-cast concrete.

42. Property drains convey rainwater collected from roofs and other private property to Council’s stormwater network. Property drains connect to the surface of laneways, kerbs and channels, Council drains and pits, as well as Melbourne Water’s main drains.

43. Drainage pits and manholes provide points of entry for stormwater from open channels and/or allow access to the underground stormwater network. Pits generally fall into two categories: surface entry pits and junction pits/manholes. Surface entry pits are located in roadside kerb and channels (grated overflow kerb pits), road centre channels (lane type pits) and other low points. Junction pits/manholes are provided for some pipe to pipe connections and for inspections and maintenance. To minimise the incidence of flooding it is important that stormwater entry pits are not obstructed in any way.

44. Pump stations work by increasing the rate of stormwater discharge to receiving waterways during significant storm events and/or when high water levels exist in the receiving waters, thereby minimising incidence of flooding. Council has four stormwater pump stations, three discharging to the Moonee Ponds Creek and

Brick barrel drain (excavated to install a gross pollutant trap)

Langford Street Pump Station, North Melbourne

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Installation of a gross pollutant trap in Swanston Street

Release nets on Moonee Ponds Creek

the fourth discharging to the Maribyrnong River. Pump station details are provided in Appendix B.

45. Retarding basins are used in conjunction with urban development to attenuate urban runoff peaks for flood protection of downstream areas. Retarding basins can also provide additional functions including water quality treatment and landscape amenity. For example, a portion of Fawkner Park has been utilised as a retarding basin for the purpose of flood protection at Armadale Street and St Kilda Road.

46. Tide and flood gates are typically located on drains immediately upstream of the outfall where high tide events are likely to cause backflow through the drain and the flooding of upstream roads and private property. Tide and flood gates are located at:

46.1 Hobsons Road outfall drain, at the Kensington Banks residential development;

46.2 Clarendon Street outfall drains, at the Melbourne Exhibition Centre;

46.3 Laurens Street outfall drain, at Queensberry Street; and

46.4 Queensbridge Street outfall drain, Southbank.

47. Levee banks have been constructed along selected sections of waterways to prevent flooding of low lying areas. Whilst Melbourne Water has responsibility for the majority of levee banks, the City of Melbourne is responsible for levee banks where they have been constructed as part of a development and the levee protects only that development (eg. The Kensington Banks residential development). Melbourne Water is responsible for the Citylink levee banks adjacent to Moonee Ponds Creek as they were constructed as part of the State required works and funded by the government.

48. Litter traps are primarily used to capture litter, debris and coarse sediments, minimising pollution of receiving waterways. Over the past 10 years, Council has implemented a staged installation program of a range of litter traps, including gross pollutant traps, release nets and trash racks. Litter trap locations and details are provided in Appendix C.

48.1 Gross pollutant traps installed within the municipality have been designed to remove litter, sediment and debris of size greater than 5mm and are able to treat flows of between 3 month and 6 month Average Recurrence Interval. This is considered to be acceptable criteria as most pollutants are carried in the initial runoff (or first flush) from a catchment.

48.2 Release nets have been installed on three major stormwater outfalls on the Moonee Ponds Creek. A release net is simply a netting attached over the outlet of a pipe. If the design flow is exceeded or the netting is full (weight determined) the net will detach from the drain, with the net opening being chocked by a short tether. The trapping ability is dependant upon the pore size of the netting used.

48.3 Generally, where trash racks have been installed the primary purpose was to protect the hydraulic integrity of tide and flood gates. Trash racks also benefit water quality by preventing coarse litter and debris from entering waterways.

49. Melbourne Water main drains are major stormwater conduits for delivery of stormwater to waterways. The City of Melbourne has numerous connections to main drains, including the Elizabeth Street main drain, the Royal Park main drain, Arden Street, Harris Street and a number of drains in Southbank.

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50. Stormwater Outfalls and Receiving Waterways. There are three major waterways within the City of Melbourne: the Yarra River, the Maribyrnong River and the Moonee Ponds Creek. These waterways have important environmental values and are used extensively for recreational and commercial activities. There are several City of Melbourne outfalls discharging into each waterway; the outfalls are often visible from the banks of the waterway. Table 2 provides details of these waterways and locations of the major stormwater outfalls.

Table 2 Stormwater Outfalls and Receiving Waterways

Waterway Descriptions Location of Major stormwater outfalls

Yarra River The Yarra River is the most prominent waterway within the City of Melbourne, yet the City of Melbourne contributes to less than 1% of the entire Yarra River catchment area. Starting in the Yarra Ranges to the East of Melbourne, the Yarra runs through the Yarra Valley and Melbourne’s eastern suburbs before discharging into Port Phillip Bay. The Yarra drains much of eastern and northern Melbourne and has the Maribyrnong River and Moonee Ponds Creek as its tributaries. The Yarra catchment covers an area of approximately 4044 square kilometres.2

Elizabeth Street*

Swanston Street

King Street

Brunton Avenue at the Tennis Centre

Lorimer Street

Hanna Street*

Maribyrnong River

The Maribyrnong River enters the City of Melbourne along its western boundary. Its catchment rises to the north-west of the City and drains to the Yarra River, covering a total area of approximately 1430 square kilometres.3 The City of Melbourne provides a relatively minor percentage of the total inflow generated within the catchment, with inflows concentrated over the lower reaches of the Maribyrnong where the River is a focus for a variety of activities.

Footscray Road

Sims Street

Hobsons Road

Flemington Racecourse

Kensington Banks

Moonee Ponds Creek

The Moonee Ponds Creek flows from Melbourne’s northern suburbs and enters the Yarra River upstream of Appleton Dock in a realigned channel beside the Bolte Bridge. The Moonee Ponds Creek Catchment covers a total area of 145km2. The catchment is contained within the Greater Yarra River Catchment and the waterway has been heavily modified in its lower reaches.

Footscray Road

Laurens Street

Macaulay Road

Arden Street*

*Outfall managed by Melbourne Water

2 Maribyrnong Catchment Action Program 1999, YarraCare 1999

3 Maribyrnong Catchment Action Program 1999, YarraCare 1999

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Stormwater Drainage Management – The Current Picture

Management of Drainage Infrastructure 51. Drainage infrastructure management can be broadly defined as the planning, design,

provision and maintenance of drains and associated structures to collect stormwater and discharge it to receiving waterways. Council’s design criteria and existing work practices are summarised in this section.

Drainage Design Criteria

52. Council provides new stormwater drainage infrastructure in accordance with the design criteria detailed below. These criteria are based on the Australian Rainfall and Runoff Guidelines and the VicRoads Road Design Guidelines, Part 7 Drainage.

Provision of drainage infrastructure 53. The City of Melbourne stormwater network consists of minor and major drainage systems.

The minor system is designed to mitigate flooding, the major system is a continuous overland flow path (or floodway system) designed to accommodate less frequent large flood events and overflows from the minor system.

54. The minor drainage system is the underground pipeline system and associated inlet structures. Generally “high profile areas” are protected for 20 Year Average Recurrence Interval (ARI) and areas outside “high profile areas” are protected for 10 Year ARI. New drains are provided in accordance with the following design ARIs:

54.1 Residential Areas 10 Year ARI

54.2 High density residential areas 20 Year ARI

54.3 Central Business District 20 Year ARI

54.4 Minor Roads 10 Year ARI

54.5 Major Roads 20 Year ARI

54.6 Bridge Decks 20 Year ARI

55. The major drainage system caters for the excess runoff from storms of higher intensity than that for which the minor drainage system has been designed. The major drainage system is designed to handle overland flows resulting from storms with 100 Year ARI.

Provide Protection to Private Property from Severe Storm Events 56. A system of underground drains, stormwater collection structures and overland flow paths

are provided to protect private property from flooding as a result of severe storm events. Severe storm events are described as those with an ARI of up to 100 years. Extreme storm events are described as those with an ARI greater than 100 years and are typically not designed for.

Limit the Impact of Increased Stormwater Runoff 57. This involves the assessment of the affect of proposed developments on the existing

drainage infrastructure and may result in a condition being placed on a planning permit.

58. When land development involves an increase in impervious surfaces within a catchment, underground drainage systems may need to be upgraded or augmented to cater for peak flows generated from rainfall events with an ARI up to 10 years or an ARI up to 20 years in high profile areas. Alternatively a planning permit condition may be that the design includes water retention and reuse or on-site retardation measures to reduce the peak discharge.

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Control Stormwater Flow Depths for Pedestrian and Vehicular Access 59. It is reasonable to expect from a comfort point of view that pedestrian access will not be

affected by a 20 year ARI in the CBD.

60. A reasonable goal for drainage capacity for CBD roads is not to be affected by a 20 year ARI and flows should be limited to the parking lanes.

Construction and Renewal

61. Council’s program for construction and renewal of drainage infrastructure is based on annual capital works programs for each asset class.

Maintenance

62. Routine maintenance for drainage is provided by the Civil Infrastructure Services (CIS) contract. In implementing these services, Council aims to:

62.1 Minimise hazards to pedestrians and vehicular traffic; and

62.2 Maximise the life cycle of the civil infrastructure.

63. The CIS contract specifies minimum intervention standards and required resolution times for each activity. Routine maintenance for drains comprises of the following activities.

63.1 Repair drainage infrastructure where structural failure has occurred as the result of damage or fair wear and tear. Common repair works include pit reconstructions, pipe replacements and side entry cover replacements.

63.2 Repair kerbing and channeling where localised failures have occurred as the result of damage or fair wear and tear. This involves repair work on subsided, dislodged, loose or missing kerb and channel.

63.3 Clean drainage infrastructure to ensure the hydraulic capacity of the system is maintained. This involves the removal of obstructions such as tree roots, litter, silt, debris and weeds. A routine inspection program consisting of visual inspections of pits is undertaken to determine cleaning requirements. Inspections do not extend into underground drains.

64. Un-programmed maintenance is similar to routine maintenance in that it is unforeseen maintenance required to return the drainage assets to a safe condition and prevent flooding or further deterioration. Un-programmed maintenance is undertaken by the Civil Infrastructure Services contractor after receiving a works order from the Engineering Services Group

Condition of Drainage Infrastructure 65. Understanding the condition of stormwater drainage assets is important for maintaining

serviceability (ie. hydraulic capacity) and for minimising the risk of asset failure. The consequences of asset failure might include legal liability and downstream impacts on Melbourne Water drains and waterways as silt and rubble is transported downstream.

66. The condition of underground drainage infrastructure can vary considerably from pipe to pipe depending on the age of infrastructure and the influence of external factors. The deterioration of pipes can be accelerated by:

66.1 Tree roots, especially at pipe joints. This results in reduced hydraulic capacity and increased risk of flooding;

66.2 Damage from service authorities works;

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66.3 The depth of conduit (eg. some pipes are located at shallow depths thereby presenting increased risk);

66.4 Cracking due to traffic loading. (eg. earthenware pipes, installed extensively by Council in the 1930’s and 1940’s for smaller drains are more prone to cracking).

66.5 The depositing of concrete slurry from building sites; and

66.6 Poorly constructed property connections.

67. As drainage infrastructure is mostly located underground, these assets are not able to be readily inspected using conventional methods. The common method of determining asset condition is via Closed Circuit Television (CCTV). CCTV being a relatively new and expensive technology has resulted in limited use in the collection of condition data; therefore Council currently has an incomplete picture of asset condition.

68. The last extensive inspections of underground drains (covering approximately 30 percent of the network) were conducted between 1995 and 1997. CCTV surveys assessed the structural condition and serviceability of pipes and culverts in areas within South Melbourne, North Melbourne, Kensington, West Melbourne and Carlton.

69. Overall, most drains surveyed were in medium structural condition. General conclusions drawn from the surveys were that the flatter grade South Melbourne and North Melbourne drains were in poor serviceable condition due to the presence of significant quantities of debris and silt, affecting the flow carrying capacity. Tree root infiltration was the main cause of drain defects in most areas, although few defects required immediate attention.

70. Council has undertaken additional CCTV surveys over time in response to problems observed with drainage performance, providing some additional information about the condition of drainage assets. Private companies may be required by Council to conduct surveys of stormwater drains where construction works may impact on the integrity.

Drainage Information Management 71. It is estimated that Council’s records (ie. detailed construction drawings) cover

approximately 80% of its underground drainage network. Council has only limited records available of historical condition analyses conducted on drainage assets. In most cases analyses have been undertaken for a specific reason; therefore the results are often narrow in scope. To upgrade records to an acceptable level is a significant but necessary task.

72. Moreover, localised assessment of the capacity of Council’s stormwater drainage system has been undertaken in response to observed problems or complaints. This is a time consuming process as specific information on the portion of the network being analysed must be determined from plan records or survey before the analysis commences.

73. Not all data is available electronically nor is it stored on one central database. This causes difficulty in accessing data and utilising data that has been placed on different software packages.

74. The lack of complete Council’s records impairs Council’s ability to make a complete assessment of drainage condition.

Land Subject to Flooding 75. A number of designated flood zones are located within the City of Melbourne and are

detailed as an overlay on the City of Melbourne Planning Scheme. General areas subject to flooding are:

75.1 Maribyrnong River at Kensington Banks;

75.2 Moonee Ponds Creek at Dynon Rd and areas in North Melbourne;

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75.3 Yarra River at Southbank, Clarendon Street and Queensbridge Street (where road levels are below the Yarra River high tide levels).

76. Due to numerous high intensity rainfall events within the municipality in the past decade, Council has undertaken significant drainage upgrades and flood mitigation works. These works addressed capacity deficiencies within the network in North Melbourne, South Melbourne, South Carlton and South Yarra.

77. Melbourne Water is the flood plain management authority for the Greater Melbourne area, and therefore has a role in the planning system as a referral authority. The City of Melbourne must consult with Melbourne Water when assessing applications to construct within designated flood zones.

Management of Stormwater Quality 78. There is an increasing focus on stormwater quality and the impacts stormwater pollutants

can have on receiving waterways. The City of Melbourne is committed to ensuring stormwater discharges to receiving waters do not impact on the environmental values and recreational and commercial activities of receiving waters.

79. Stormwater pollutants are any materials that upon entering the stormwater network degrade the quality of stormwater to the detriment of the receiving waterways. Key potential stormwater pollutants are toxicants, nutrients, oxygen demanding substances, microbial pathogens, physical pollutants and aesthetic pollutants. Major sources of stormwater pollutants in the municipality were identified in the development of the Stormwater Management Plan, 2000. In summary, major stormwater pollutants in the municipality include urban-derived litter, runoff from industrial sites, and commercial land uses (particularly within the CBD). Appendix D provides a detailed explanation of these pollutants.

Stormwater Quality Controls

80. Since the implementation of the Stormwater Management Plan, 2000, the City of Melbourne has undertaken significant initiatives to reduce pollutants entering the stormwater system. Past and present strategies are detailed below.

Education 81. Council has developed and implemented education programs relating to waste and

environmental management. Council promotes the Waste Wise Schools Program, where schools commit to introducing waste minimisation initiatives and litter reduction controls. Improved waste management leads to a reduction in available pollutant loads to stormwater.

82. A recent initiative has been the development and publication of a stormwater education storybook – ‘I Only Drain Rain’ to educate children about ways to reduce litter and keep it out of waterways and, ultimately Port Phillip Bay. Copies of the storybook were provided to all primary schools within the municipality.

Litter Controls 83. The City of Melbourne provides over 1500 street litter bins and 200 ashtrays. Bins have

been located at strategic locations to help minimise litter on streets.

84. Council places a strong emphasis on cigarette litter controls. Campaigns have been run to raise public awareness of the environmental impact of cigarette litter and to warn litterers of the potential to be fined. Campaigns have involved face to face education, the promotion of personal ashtrays to CBD and the provision of information cards. Recent initiatives also include requiring all kerbside cafes to provide windproof ashtrays and requiring commercial premises to take responsibility for cigarette litter that has been generated as a result of the operation of their business.

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85. Litter traps are available in varied designs, sizes and are chosen to suit specific treatment requirements. There has been limited monitoring of the trapping performance of Council’s current litter traps, and currently there is limited independent performance data available for the diverse range of pollution control devices available on the market. Notwithstanding this, the process used to select sites and types for litter traps is based on consideration of the following factors:

85.1 size and land use type of contributing catchment;

85.2 available space underground or on the waterway;

85.3 acceptability of head loss created in the drainage system by the litter trap;

85.4 accessibility for cleaning purposes;

85.5 depth of culvert;

85.6 consistency with previous litter trap installations within the municipality;

85.7 estimated amount of pollutants to be trapped4; and

85.8 Suitability of litter traps for use in tidal conditions.

86. The City of Melbourne has a comprehensive street cleaning program which is carried out by two separate cleaning contractors on a performance based contract arrangement. Street sweeping occurs on road carriageways and footpaths with cleaners capturing as much litter as possible before it enters the drainage system.

Stormwater Management for Building and Construction 87. The City of Melbourne has developed guidelines to address stormwater management on

private building and construction sites. The project outputs include: a report titled Stormwater Guidelines for Building and Construction5, a series of fact sheets and the delivery of staff training. The fact sheets are specific to construction sites in the City of Melbourne and cater for large and small construction sites, developers, construction workers and Council staff.

88. A project to protect stormwater quality from the impacts of building and construction sites was initiated by the City of Kingston and Melbourne Water. Under the program, an officer was employed to visit building sites and educate on-site workers about good stormwater management practice. The project was supported by the Victorian Government (as part of the Victorian Stormwater Action Program), the City of Melbourne and four other local Councils.

89. The Activities Local Law, Part 8, Building Works (nuisance abatement) contains provisions to prevent nuisances caused by building works:

89.1 A Construction Management Plan may be requested for building construction or demolition works, and is one avenue through which stormwater protection controls can be specified. The request can be made at the planning permit stage as a condition of permit, or through the notification of works requirement.

89.2 The wheels and undercarriage of vehicles are required to be kept clean when exiting from a site of filling, excavation, landscaping, building or demolition.

Partnership Projects 90. The City of Melbourne works in partnership with other organisations on stormwater

management projects. The City of Melbourne were successful in securing funding from the Victorian Stormwater Action Program for three major stormwater improvement initiatives:

4 methods are outlined in the ‘Decision Support System for Determining Effective Trapping Strategies for Gross Pollutants – CRCCH 1998’

5 KBR June 2003

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90.1 RMIT Rainwater Harvesting Project,

90.2 Queen Victoria Market Environment Improvement Plan,

90.3 Industrial runoff from the Upper Maribyrnong Catchment.

91. The City of Melbourne participates in the Moonee Ponds Creek - Keep It Clean initiative, a multi-agency project involving Commonwealth, State, Regional & Local government departments and organisations, businesses, community groups and individuals. Aggregate funding of $2.6 million has been invested by Environment Australia, Melbourne Water, the Victorian Stormwater Action Program, the Cities of Hume, Moreland, Moonee Valley & Melbourne, EcoRecycle Victoria and Melbourne Port Corporation. The project demonstrates how litter can be effectively controlled through a coordinated catchment-based approach. Activities include:

91.1 Structural initiatives such as installation of pollution control devices and development of the Jacana wetlands

91.2 Educational and promotional activities, such as Clean Up events and litter enforcement activities throughout the Moonee Ponds Creek Catchment.

Other Stakeholder Activities 92. Various stormwater management initiatives have also been implemented by other

management authorities for lands within or directly adjacent to the City of Melbourne. These include:

92.1 Parks Victoria which owns and maintains several floating litter booms in the Yarra and Maribyrnong Rivers;

92.2 VicUrban which has developed an environmental management plan for the Docklands area to ensure that impacts from construction activities are managed and minimised as part of ongoing development works. It has also installed in-line gross pollutant traps to reduce loads of sediment and litter.

92.3 Melbourne Port Corporation which has implemented a whole of Port Environmental Management Plan, incorporating a commitment to water quality initiatives such as the installation of litter traps on Moonee Ponds Creek.

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Stormwater Drainage Management – The Future Plan

Introduction 93. The Drainage Plan includes initiatives that will increase the serviceability of the drainage

network and improve the quality of stormwater discharge to receiving waters. This Chapter discusses the issues that the Drainage Plan will need to address to meet its objectives in the future. Actions are presented to address these issues (highlighted in text boxes); these actions are then consolidated in the Implementation Plan on page 29.

94. The issues discussed in this Chapter should be considered in the context of the consequences should these issues fail to be addressed. The consequences of failure or collapse of drainage assets may include:

94.1 Street and property flooding;

94.2 Damage to property including undermining of the integrity of roads and footpaths, damage to other authorities infrastructure, damage to personal property;

94.3 Personal injury and/or death;

94.4 Disruption to traffic movement;

94.5 impacts to Melbourne Water drains and receiving waterways as silt and rubble is transported downstream; and

94.6 Legal liability.

95. The consequences of not undertaking measures to reduce contaminants in stormwater may include:

95.1 Damage to aquatic life. This includes loss of habitat and death of marine life due to the impact of pollutants,

95.2 Decreased recreational value of waterways (eg. visual appearance effected by visible litter, debris, odour and colour of the water).

95.3 Pollution abatement notices issued under the Environment Protection Act 1970.

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Managing Asset Performance

Inspection and Maintenance of Drains

96. There are many challenges associated with inspecting and maintaining the drainage network. These include:

96.1 Restricted access to pits particularly in the CBD due to traffic and parking activity;

96.2 Restricted access to pits classed as confined spaces;

96.3 The tidal affect on lower lying drainage lines;

96.4 The location of many drainage assets on land not under Council control ie. VicTrack, the Port of Melbourne Corporation; and

96.5 The relatively shallow depth of the system (in comparison to sewers) can result in conflict with the numerous underground services, particularly in the CBD.

97. As discussed, Council’s routine inspection program for drainage as required by the Civil Infrastructure Services (CIS) covers the visual inspection of drainage pits only. Inspections are not undertaken of underground pipes. The ideal management system is to identify the most important or critical assets in the network and establish an inspection program that is consistent in its frequency with the criticality of the asset. Blanket inspection of assets can result in assets of higher criticality not being inspected often enough and less critical assets being inspected unnecessarily. For example earthenware pipes some of which date back to the 1850’s, have been identified as being prone to failure due to their low durability, however focussing attention on these pipes which generally carry smaller flows may result in pipes with higher consequences of failure being neglected.

98. With a limited inspection program, drainage maintenance is only undertaken when a system failure occurs that is identified to be below the intervention standard specified by the Civil Infrastructure Services contract. This approach is seen as reactive and often results in defects being discovered when a drain fails structurally (eg. collapse) or hydraulically (eg. blockage) and resulting flooding occurs.

Develop and implement a routine inspection program (ie. ongoing CCTV inspections) to progressively identify asset condition and to develop a proactive drainage maintenance program. Asset condition information can also be fed into the risk assessment approach.

Rationalise the maintenance works program by identifying areas that require increased or decreased maintenance based on the consequence and frequency of failure.

Inspection and maintenance of litter traps

99. Under the CIS contract, the maintenance of litter traps is currently performed on a calendar basis. Experience has shown that optimal performance and cost effectiveness can be achieved with a maintenance program structured by regular inspections to determine cleaning frequency and includes a response to rainfall events.

100. The consequences of a poorly maintained litter trap might include failure of the device to perform as specified; potential for the device to become a flood hazard; and the potential for contents to break down and release back into the stormwater system, therefore becoming a source of pollution itself.6

6 Allison, R. and Pezzaniti, D., Australian Runoff Quality Guidelines (Draft), June 2003

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101. It is important that Council considers the different cleaning options and adopts an inspection and maintenance schedule which is cost effective and provides for optimal performance in capturing litter and minimising potential hazards such as flooding. This is particularly the case during the first 12 months of operation to monitor for possible faults and check required cleaning frequency.

Council will adopt a routine inspection and maintenance program for litter traps that will work to achieve an optimum efficiency of each litter trap.

Asset Failure

102. As discussed, Council is at risk of liability where stormwater assets fail to perform as designed. Instances of flooding that cause property loss or damage may lead to costly and time-consuming litigation against Council.

103. Whilst structural failures of the drainage system that have occurred in recent times have not resulted in major disruption or property damage, the full risks associated with failures are not known. It is considered that the best defence against claims of liability against Council will be to have a risk based asset management plan for the drainage network in place. This plan would direct Council’s drain inspection and maintenance works programs.

Conduct risk assessments progressively throughout the municipality to identify areas where asset failure could have unacceptable consequences. The risk analysis will require hydrologic and hydraulic performance data and condition assessment data for the pipe network.

Construction and Renewal

104. As discussed, Council’s current practice for construction and renewal is based on an annual capital works programs. is to provide indicative five-year rolling capital works programs, the current process of selecting works is mainly re-active and is in need of a structured risk based approach for the prioritisation of works.

Establish a 5 year rolling drainage capital works program. Council will utilise outcomes of risk analyses and condition assessments to feed into program.

Implement capital works for drains in accordance with annual capital works program.

Drainage Capacity

105. The performance of the Council’s stormwater drainage system has not been determined for the 1% Average Exceedance Probability (AEP) of flood extents (ie. for storm events of 100 year Average Recurrence Interval). Melbourne Water has completed the task of determining 1% AEP flood extents for its drainage system which have been incorporated into a special building overlay in Melbourne’s Planning Scheme. This became important when the Building Regulations 1994, regulation 6.6 (Uncontrolled overland drainage) came into affect. Building regulation 6.7 (2) states: “A Council must prepare maps for all designated special areas within its municipal district as soon as practicable after 1 February 1997.”

Council to develop hydrologic and hydraulic performance data on the drainage network. This will include an analysis of the network to determine 1% AEP flood extents. The analysis will include all major drainage networks and a selection of minor drainage networks.

106. Council has addressed capacity deficiencies in areas within North Melbourne, South Melbourne, South Carlton and South Yarra. There are additional areas which are known to be subject to capacity deficiencies.

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Identify all locations where the frequency of flooding is high and develop site specific flood management strategies for these locations.

107. Building and construction works including streetscape works, changes to road surfaces; kerb alignment and level changes or any works which may alter an overland flow path have the potential to adversely affect localised flood levels.

Capital works proposed by Council or other authorities which include streetscape works, changes to road surfaces; kerb alignment and level changes or any works which may alter an overland flow path will be assessed from a major storm perspective to determine the impact on localised flood levels.

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Drainage Information Management

Access to drainage information

108. As discussed, it is estimated that Council’s records (ie. detailed construction drawings) cover approximately 80% of its underground drainage network and contain only limited record of historical condition analyses. Many of these records are not stored electronically.

109. Deficiencies in data accessibility adversely affect works program planning, maintenance reporting and planning, investigation of complaints and defects, design of new infrastructure, assessment of development applications and responses to customer requests for information.

Based upon a schedule to be developed, Council will progressively upgrade plans of the entire drainage network.

Drainage information system

110. The City of Melbourne is in need of a drainage asset information system that contains network data in a Geographical Information System (GIS) form. This spatial system would link labelling of pits, drains, tide gates, pollutant traps, pump stations and other associated infrastructure with relevant asset information such as size, age, material and depth viewable by selecting the asset on the screen. Non-structural information such as maintenance history, catchment areas and land subject to flooding would also form part of the system. The benefits to Council of a drainage asset information system include:

110.1 Strategic planning. The system could be used to store condition data on the assets, enabling maintenance and capital works to be programmed economically;

110.2 Risk management. The system could record the criticality of assets and when combined with the known or expected condition, facilitate the development of prioritised maintenance programs;

110.3 The provision of an efficient means of accessing depreciation information on the assets (as required by AAS27);

110.4 The system would provide the inputs for hydraulic analysis software;

110.5 Maintenance history and programming is more easily understood when it is displayed spatially;

110.6 Flooding complaints could be spatially defined and reviewed against maintenance records and hydraulic capacity allowing a hitherto unavailable correlation tool;

110.7 Quick access to information for Council staff and efficient delivery of information to customers, including contractors, emergency maintenance staff, developers and consultants;

110.8 The ability to trace pollution spills in emergency situations; and

110.9 The ability to identify abandoned/redundant drainage assets.

Council will adopt a drainage asset information system in line with the Asset Management Steering Group recommendations. As this will be a significant project, works will need to be staged over a period of time. Tasks will include:

• Set up an asset data warehouse and a spatial database warehouse (GIS) with the appropriate data fields for stormwater asset management.

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• Undertake data capture of the stormwater drainage network to populate the asset data warehouse and the spatial data warehouse. This will require field investigations to fill in the gaps in network data.

• Validate the network data by running a series continuity tests.

• Develop a series of reports to support the business requirements of stormwater drainage management (eg. to enable tracking of asset performance and maintenance activity)

• Document procedures and processes for data maintenance.

Managing New Drainage Assets

111. Should the Docklands revert to the City of Melbourne, all drainage assets within the Docklands will become the responsibility of Council. Therefore drainage assets within the Docklands will need to be incorporated into Council’s existing drainage management systems.

Should the Docklands revert to the City of Melbourne, all drainage assets within the Docklands will be incorporated into Council’s existing drainage management systems.

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Stormwater Quality Improvements 112. Polluted stormwater runoff and the effects of flushing from urban areas are likely to explain

most of the moderate to severe degradation of streams in metropolitan catchments. Improving the management of stormwater quality requires a multi-faceted approach that involves the installation and maintenance of infrastructure, education and awareness, enforcement and monitoring.

Education

113. Council places a strong emphasis on school and community education. Stormwater education programs with schools, residents and businesses are seen as a vital aspect for improving stormwater quality. Objectives of education programs are to raise awareness of the stormwater system as opposed to the sewerage system; create knowledge of stormwater pollutants and their impact on waterways; and to elicit a behavioural change away from littering.

Council will continue to focus on education activities that contribute to stormwater management. Education programs and support will be offered to schools within the municipality focusing on stormwater awareness and waste management. Tools developed by Council and external parties will be used to assist the teaching program.

Community education programs such as Waterwatch to continue to be supported by Council.

Council to pursue means of educating the community through the placement of litter traps and signage to detail to passers-by the importance of litter traps, Council’s investment in stormwater protection and ways in which to showcase the volumes and types of materials captured in litter traps.

Use the local media to highlight Council’s stormwater improvement initiatives.

Litter & Pollutant Management

114. Litter and pollutants degrade stormwater and subsequently impact on the quality of receiving waterways. Litter and pollutants of particular concern include wind blown refuse, cigarette butts, sediment, paints and chemicals washed from building sites or house renovations, sewerage (from illegal connections to stormwater or infiltration) and polluted runoff from commercial and industrial sites.

Council to undertake education activities with targeted commercial and industrial sites to address environmental management responsibilities for preventing stormwater pollution. Sites to be targeted will include:

• Eating establishments

• Automotive workshops

• Large industrial sites.

Council to identify illegal sewerage connections to stormwater drains.

115. Council’s current network of litter traps captures a proportion of litter and pollutants thereby improving the stormwater quality of discharges to the Yarra River, Maribyrnong River and Moonee Ponds Creek. There are opportunities within the stormwater network to install more pollution control devices.

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116. Retro-fits to the entire drainage system would be difficult due to the age of infrastructure, complexity of underground services and resultant cost. Litter traps often represent a significant public investment in both the capital cost as well as the ongoing cleaning and maintenance costs. Research has shown that maintenance costs range between 3-9% of capital cost per annum.7 This places some limitations on placement of pollution control devices.

Design and install litter traps at proposed locations in accordance with the annual capital works program.

Council to review suitable locations within the municipality for further litter trap installations and prepare a 5-year litter trap installation plan.

117. As discussed, there has been limited monitoring of the trapping performance of Council’s current litter traps. When selecting new litter traps, the lack of performance data can hamper the decision making process if there is uncertainty in the device’s ability to meet treatment objectives. The benefits of an ongoing performance monitoring program include enabling a knowledge base to be developed for future selection of appropriate devices; allow reporting on the volumes of pollutants prevented from entering waterways; and provide the ability to optimise cleaning schedules.

Implement a reporting process for litter trap cleaning (as part of the routine inspection and maintenance program) to enable Council to quantify the benefits or otherwise of the current litter traps operating within the municipality.

For the future selection of pollution control devices, Council to seek independent performance data of pollution control devices and use this data to make comparisons of each device’s ability to meet treatment objectives.

118. New waterfront development and greater future use of waterways for transport (eg. waterfront residential developments, Yarra River ferry service) will place pressure on the City of Melbourne and the Victorian Government to develop and implement stormwater quality strategies that will see long term improvements in water quality. If land currently under the control of VicUrban (ie Docklands) is transferred to Council, these strategies will take on even greater strategic importance.

Council to continue to implement litter management initiatives to educate residents and visitors to the city of the importance of litter management and the impacts on the environment.

Council to continue to support and participate in the Victorian Litter Action Alliance to improve litter management in the City of Melbourne and to ensure a state wide approach to litter management.

Council to continue to support and participate in the Moonee Ponds Creek Coordination Committee to reduce litter pollution in the Moonee Ponds Creek.

Building & Construction Activity

119. Building and construction activity within the City of Melbourne has been identified as a potential threat to stormwater quality and the condition of stormwater drains. If not managed properly, sediment, paints and chemicals can be washed from construction sites and into the stormwater drains, causing detriment to receiving waterways. Sediment can build up in stormwater drains leading to blockages and potential flooding.

7 Construction Contractor, 2003

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120. Recent observations of the condition of stormwater drains around building sites, suggest further work can be done to improve stormwater management practices at these sites. The present situation places a burden on the Council (ie. maintenance of stormwater drains and litter traps and investigating the parties responsible). As discussed, the City of Melbourne has developed guidelines to address

121. Council is currently developing a framework and guidelines for Construction Management Plans (CMPs) requirements. CMPs may be requested for building construction or demolition works, and is one avenue through which stormwater protection controls can be specified. Coupled with on-going education, CMP guidelines are required to boost builder/developer’s awareness of requirements at construction sites.

Implement a framework and guidelines for Construction Management Plans to boost builder/developer’s awareness of stormwater protection requirements at construction sites.

Increase compliance in relation to stormwater protection measures on building and construction sites.

Stormwater Quality

122. The quality of stormwater discharge within the City is mostly unknown, as there has been no data collected on the movement of water borne pollutants through the City of Melbourne’s drainage system. Methods of collecting stormwater quality data are difficult and expensive and often provide only a limited understanding of water quality. Subsequently no measurement has been undertaken of the impacts of the city’s stormwater discharge on receiving waters.

123. Without knowing the current status of stormwater quality, Council is at risk of contravening the State Environment Protection Policy (Waters of Victoria). It is important to understand these risks to enable the planning and implementation of appropriate controls.

124. Rather than undertaking a stormwater quality monitoring program it would be more cost effective to use pollutant export modelling to predict stormwater quality. This model can be used to measure changes in the stormwater pollutant export rates when known changes have been made to the system (ie. changes in behaviour, practices or structural measures).

Use stormwater pollutant export modelling to predict stormwater quality improvements when significant changes are proposed within a catchment.

Stormwater as a Resource

125. The use of non-conventional water resources (stormwater, rainwater, grey water, etc) to replace or supplement potable water supply can fundamentally alter the urban water balance and provide significant benefits over the whole water cycle. These alternative uses are viable within the municipality and are an effective means of lowering the reliance on potable water supplies.

Council to continue to pursue opportunities both within Council’s operations and with external parties for increasing rainwater collection and water reuse.

Other Initiatives for Stormwater Quality

126. Water Sensitive Urban Design (WSUD) aims to bring consideration of the water environment and infrastructure service design into the early stages of the decision making processes for urban planning and design. The City of Melbourne is committed to the application of WSUD and will increasingly look for opportunities where water sensitive urban design can be applied. This will be challenging due to the highly built-up environment that already exists within the City of Melbourne.

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127. Projects in progress and planned which include WSUD principles include the Royal Park Wetlands (currently in development) will treat the stormwater runoff from the Royal Melbourne Zoo by 2005; the Dynon Road Canal is planned to be upgraded to meet environmental requirements, adopting a water sensitive urban design approach; and natural stormwater treatment mechanisms are proposed to be activated at the Birrarung Marr site over the coming years.

Council to develop guidelines to assist in the incorporation of Water Sensitive Urban Design principles for Council drains.

All designs for new or upgrades to public open spaces, road layouts and streetscapes to consider the application of Water Sensitive Urban Design principles and at a minimum meet the objectives of the “Surface Treatment Policy”.

128. With emerging technologies and research in the area of stormwater there is a need for Council to remain well informed. The Urban Hydrology Program facilitated by the Cooperative Research Centre for Catchment Hydrology is a key source for stormwater research for understanding stormwater pollution processes, measuring pollution and improving stormwater pollution control.

Provide Council staff with development and training opportunities in stormwater management issues.

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Implementation & Review

Accountability and Responsibility for Implementation of the Plan 129. The Drainage Plan is relevant to all aspects of Council’s management and development of

stormwater infrastructure. It is imperative to obtain a clear commitment from all levels of Council to the strategies conveyed within this Drainage Plan will be championed within Council and the community.

130. Council’s endorsement and overall support of the Plan should be recognised in the City Plan and appropriate budget allocations made to ensure implementation of all strategies.

Monitoring and Review Process 131. The ultimate success of this Drainage Plan will be dependent on Council’s ability to

implement the strategies and progressively review effectiveness. Each strategy will be monitoring periodically to ensure the outcomes are being achieved.

132. Where outcomes are not being met, modification to actions can be made to ensure the end of the five-year time frame the plan’s objectives are achieved.

Funding and Budget Allocation 133. The successful implementation of the Drainage Plan will require a substantial funding

commitment from Council.

134. To assist local authorities in the implementation of Stormwater Management Plans, the State Government, through Melbourne Water has already contributed over $600,000. Also the Environment Protection Authority, are in the final stages of the Victorian Stormwater Action Program, with has run since 2000, contributing $22.5 million to improve environmental management of urban stormwater in Victoria. This money was allocated during three rounds of funding (2000, 2001, and 2002). It is not known whether further funding will be provided.

135. Some potential sources of funding include:

135.1 Development contributions under the Planning and Environment Act 1987, Part 3B.

135.2 Federal and State government funding of community education programs, including Waterwatch, National Heritage Trust, Gould League and Western Regional Waste Management Group.

135.3 EPA and EcoRecycle Victoria provide sources of educational material.

135.4 EcoRecycle grants for litter related projects.

135.5 Linking activities in this Plan with program or capital works activities undertaken by other organisations.

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Implementation Plan

Theme Action Funding Required Timeframe

1. Develop and implement a routine inspection program (ie. ongoing CCTV inspections) to progressively identify asset condition and to develop a proactive drainage maintenance program. Asset condition information can also be fed into the risk assessment approach.

$50,000 per year for three years commencing 2006/07

2006 - 2009 Inspection and maintenance of Drains

2. Rationalise the maintenance works program by identifying areas that require increased or decreased maintenance based on the consequence and frequency of failure.

Existing staff resources 2006 - 2009

Inspection and maintenance of litter traps

3. Council will adopt a routine inspection and maintenance program for litter traps that will work to achieve an optimum efficiency of each litter trap.

$60,000 per year for five years commencing 2004/05 (provided under the Civil Infrastructure Services Contract)

2004 - 2009

Asset Failure 4. Conduct risk assessments progressively throughout the municipality to identify areas where asset failure could have unacceptable consequences. The risk analysis will require hydrologic and hydraulic performance data and condition assessment data of the pipe network.

$15,000 per year for two years commencing 2006/07

2006 - 2008

5. Establish a 5 year rolling drainage capital works program. Council will utilise outcomes of risk analyses and condition assessments to feed into program.

Existing staff resources 2005 - 2009 Construction and Renewal

6. Implement capital works for drains in accordance with the annual capital works program. Subject to annual funding bids

2004 - 2009

7. Council to develop hydrologic and hydraulic performance data on the drainage network. This will include an analysis of the network to determine 1% AEP flood extents. The analysis will include all major drainage networks and a selection of minor drainage networks.

$25,000 per year for two years commencing 2007/08

2007 - 2009

8. Identify all locations where the frequency of flooding is high and develop site specific flood management strategies for these locations.

$15,000 per year for three years commencing 2004/05

2004 - 2007

Drainage capacity

9. Capital works proposed by Council or other authorities which include streetscape works, changes to road surfaces; kerb alignment and level changes or any works which may alter an overland flow path should be assessed from a major storm perspective to determine the impact on localised flood levels.

Existing staff resources Ongoing

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Theme Action Funding Required Timeframe

Access to drainage information

10. Based upon a schedule to be developed, Council will progressively upgrade plans of the entire drainage network.

$30,000 per year for two years commencing 2005/06

2005 - 2007

Drainage information system

11. Council will adopt a drainage asset information system in line with the Asset Management Steering Group recommendations. Tasks will include:

(a) Set up an asset data warehouse and a spatial database warehouse (GIS) with the appropriate data fields for stormwater asset management.

(b) Undertake data capture of the stormwater drainage network to populate the asset data warehouse and the spatial data warehouse. This will require field investigations to fill in the gaps in network data.

(c) Validate the network data by running a series continuity tests.

(d) Develop a series of reports to support the business requirements of stormwater drainage management (eg. to enable tracking of asset performance and maintenance activity)

(e) Document procedures and processes for data maintenance.

Existing resources

(b) – (e): $75,000 per year for two years commencing 2005/06

End 2004

2005 - 2007

Managing New Drainage Assets

12. Should the Docklands revert to the City of Melbourne, all drainage assets within the Docklands must be incorporated into Council’s existing drainage management systems.

Funding requirements to be identified as part of the transition process.

unknown

13. Council to continue to focus on education activities that contribute to stormwater management. Education programs and support to be offered to schools within the municipality focusing on stormwater awareness and waste management. Tools developed by Council and external parties to be used to assist the teaching program.

Existing resources (provided under the Waste Management Services contract until April 2007)

Commencing 2004 - ongoing

14. Community education programs such as Waterwatch to continue to be supported by Council $5,000 per year for five years commencing 2004/05

2004 - 2009

15. Council to pursue means of educating the community through the placement of litter traps and signage to detail to passers-by the importance of litter traps, Council’s investment in stormwater protection and ways in which to showcase the volumes and types of materials captured in litter traps

Existing staff resources

Ongoing

Education

16. Use the local media to highlight Council’s stormwater improvement initiatives. Existing staff resources Ongoing

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Theme Action Funding Required Timeframe

17. Council to undertake education activities with targeted commercial and industrial sites to address environmental management responsibilities for preventing stormwater pollution. Sites to be targeted will include eating establishments; automotive workshops; and large industrial sites.

$5000 per year for three years commencing 2004/05. (ie. one type of commercial business is covered each year)

2004 - 2007

18. Council to identify illegal sewerage connections to stormwater drains. Existing staff resources Ongoing

19. Design and install litter traps at proposed locations in accordance with the annual capital works program.

Subject to annual funding bids

2004 - 2009

20. Council to review suitable locations within the municipality for further litter trap installations and prepare a 5-year litter trap installation plan.

$15,000 for one year 2004/05

21. Implement a reporting process for litter trap cleaning (as part of the routine inspection and maintenance program) to enable Council to quantify the benefits or otherwise of the current litter traps operating within the municipality.

Covered by inspection program detailed in number Action No. 3.

Commencing 2004/05

22. For the future selection of litter traps, Council to seek independent performance data of pollution control devices and use this data to make comparisons of each device’s ability to meet treatment objectives.

Existing staff resources Ongoing

23. Council to continue to implement litter management initiatives to educate residents and visitors to the City of the importance of litter management and the impacts on the environment.

$10,000 per year for five years commencing 2004/05

2004 -2009

24. Council to continue to support and participate in the Victorian Litter Action Alliance to improve litter management in the City of Melbourne and to ensure a state wide approach to litter management.

$5000 per year for a minimum of three years commencing 2004/05

2004 - 2007

Litter and pollutant management

25. Council to continue to support and participate in the Moonee Ponds Creek Coordination Committee to reduce litter pollution in the Moonee Ponds Creek.

Existing staff resources ongoing

26. Implement a framework and guidelines for Construction Management Plans to boost builder/developer’s awareness of stormwater protection requirements at construction sites.

Existing staff resources End 2004 Building & Construction Activity

27. Increase compliance in relation to stormwater protection measures on building and construction sites.

Existing staff resources 2005 - Ongoing

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Theme Action Funding Required Timeframe

Stormwater Quality 28. Use stormwater pollutant export modelling to predict stormwater quality improvements when significant changes are proposed within a catchment.

Existing staff resources Ongoing

Stormwater as a Resource

29. Council to continue to pursue opportunities both within Council’s operations and with external parties for increasing rainwater collection and water reuse.

Funding to be pursued as opportunities arise

Ongoing

30. Council to develop guidelines to assist in the incorporation of Water Sensitive Urban Design principles for Council drains.

Existing staff resources 2004/2005

31. All designs for new or upgrades to public open spaces, road layouts and streetscapes to consider the application of Water Sensitive Urban Design principles and at a minimum meet the objectives of the “Surface Treatment Policy”.

Existing staff resources Ongoing

Other Initiatives for Stormwater Quality

32. Provide Council staff with development and training opportunities in stormwater management.

Existing staff resources Ongoing

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Appendix A - Regulatory Framework

The following regulatory framework guides drainage design, planning and management.

Local Government Act 1989 (“LGA”), Section 198 provides that, other than sewers and drains vested in another Council or a Minister, the Crown or any public body, the following are vested in the Council and are under the management and control of the Council:

“(a) public sewers and drains within the municipal district;

(b) sewers and drains in and under roads in the municipal district;

(c) Works and materials relating to (a) and (b).”

Section 3E of the LGA states that the functions of a Council include:

“(b) planning for and providing services and facilities for the local community;

(c) providing and maintaining community infrastructure in the municipal district.”

Under section 3F of the LGA, Council also has the power to do all things necessary and convenient to be done in connection with the achievement of its objectives and performance of its functions.

Further, the LGA gives Victorian Councils the power to create local laws to assist in delivering democratic, efficient and effective local government. The Environment Local Law 1999 and the Activities Local Law 1999 include reference to the protection of stormwater.

Planning and Environment Act 1987 provides a ‘framework for planning the use, development and protection of land in Victoria in the present and long-term interests of all Victorians’. The framework requires planning to encompass and integrate relevant environmental, social and economic factors. The City of Melbourne has an obligation (as a planning authority and responsible authority) for administering the Act, to consider the potential impacts that land uses and developments may have on stormwater discharges.

The Road Management Act8. Following the High Court decision that changed the common law governing civil liability for road management (nonfeasance defence), the State Government initiated a review of the State's road management legislation. The Transport (Highway Rule) Act was introduced to reinstate protection for road authorities until 1 January 2005. In the meantime, the Road Management Act has been introduced to establish a legislative framework to allow each road authority to determine its own appropriate Road Management Plan (RMP). The RMP identifies responsibilities, maintenance standards and inspection regimes required to manage civil liability and demonstrate that the authority is responsibly managing all of the road assets within its control including drainage.

AAS27 Australian Accounting Standard is the statement by the professional accounting bodies on how local government should present general purpose financial statements. It requires that all non-current assets (including stormwater pipes and other infrastructure) with limited useful lives be depreciated in accordance with AAS 4 “Depreciation of Non-Current Assets”.

Urban Stormwater Best Practice Environmental Management Guidelines provide guidance in the development of objectives and strategies for improved stormwater management of urban catchments, to assist in achieving State Environment Protection Policy requirements.

8 The Act is expected to be passed by the Victorian State parliament in the autumn session, 2004.

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Australian Rainfall and Runoff, Volume 2, 1997. The City of Melbourne’s drainage criteria (as detailed in section 6 of this document) are based on the rainfall data and patterns as defined in Australian Rainfall and Runoff, first published in 1987 and modified in 1997.

VicRoads Road Design Guidelines, Part 7 – Drainage covers the recommended drainage design procedures for use on the road system in Victoria.

The following regulatory framework exists to manage and protect stormwater quality and provides guidelines for achieving compliance.

Environment Protection Act 1970 (the Act). Administered by the Environment Protection Authority, the Act sets out a statutory framework for protecting the environment through mechanisms such as licensing works approvals, inspections, pollution abatement notices, State Environment Protection Policies (SEPPs) and land use planning referrals. Under the Act Pollution Abatement Notices may be issued where activities have impacted on the environment. The Environment Protection Act authorises councils to issue on the spot fines for cigarette littering, ranging from $100 for extinguishing a cigarette butt on the ground to $200 for dropping a lit cigarette.

State Environment Protection Policies (SEPPs) establish the beneficial uses and values of the environment and define environmental quality objectives. SEPP Schedule F6 (Waters of the Port Phillip Bay) and SEPP F7 (Waters of the Yarra Catchment) are applicable to the City of Melbourne’s management of stormwater. Schedule F6 defines requirements for nutrient management within Port Phillip Bay and Schedule F7 defines requirements for protecting the beneficial uses of the Yarra River and its tributaries.

Local Laws. The Environment Local Law 1999 adopts an Environment Management Plan to control wastes and emissions and protect stormwater drains. Under the Activities Local Law 1999, Council has the power to request a construction management plan that addresses stormwater management considerations.

Building Regulations 1994. Council provides advice on stormwater discharge points in accordance with the Building Regulations 1994.

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Appendix B - Stormwater Pump Stations

Pump Station System Overview

Langford Street Pump Station No. 3

Located at the corner of Langford Street and Macaulay Road, North Melbourne

Flow from the catchment is normally directed via gravity to the Moonee Ponds Creek via an 825mm brick drain in Macaulay Road. When the water level in the pump station rises due to excess inflow from the catchment or high water level in the creek, the pumps automatically start and a valve on the 825mm drain closes, directing all flow through the pump station.

The pump station consists of two pumps, each with a minimum pump duty of 350litres/sec.

Caters for peak discharge from a storm with a 20 year ARI.

Langford Street Pump Station No. 4

Located approximately 100m from the intersection of Langford Street and Macaulay Road, North Melbourne

Flow from the catchment is normally directed via gravity to the Moonee Ponds Creek via a pump station bypass valve. When the water level in the pump station rises due to excess inflow from the catchment or high water level in the creek, the pumps automatically start and the bypass valve closes, directing all flow through the pump station.

The pump station consists of two pumps, each with a minimum pump duty of 350litres/sec.

Caters for peak discharge from a storm with a 20 year ARI.

Bent Street Pump Station

Located at the corner of Bent Street and Macaulay Road, North Melbourne

Flow from the catchment is normally directed via gravity to the Moonee Ponds Creek via a pump station bypass valve. When the water level in the pump station rises due to excess inflow from the catchment or high water level in the creek, the bypass valve closes and stormwater flows over a weir and through a screen into the pump station.

The pump station consists of two pumps, each with a minimum pump duty of 350litres/sec.

Caters for peak discharge from a storm with a 20 year ARI.

Kensington Road Pump Station

Located approximately 100m from the intersection of Dynon Road and Kensington Road, Kensington

Under normal conditions, stormwater flow from the catchment is directed via gravity through the pump station and discharged into Maribyrnong River. At times of excess inflow from the catchment or high water level in the river the pumps start automatically and continue to operate until the water level falls below the preset level.

The pump station consists of two pumps, each with a minimum pump duty of 140 litres/sec.

Source: City of Melbourne Stormwater Pump Stations Operation and Maintenance Manuals, July 2003

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Appendix C - Litter Traps

As funded and managed by the City of Melbourne

Location Litter Traps Purpose Ultimate receiving waterway

Installed

Lygon Street, Carlton

Gross pollutant trap – Humegard

To prevent litter, debris and sediment from entering the Elizabeth Street main drain.

Yarra River 1997

Therry Street, at the Queen Victoria Market

Gross pollutant trap – Ecosol RSF 4600

To prevent litter, debris and sediment from entering the Elizabeth Street main drain.

Yarra River 2001

Victoria Street Gross pollutant trap – CDS PO708

To prevent litter, debris and sediment from entering the Elizabeth Street main drain.

Yarra River 2002

Spencer Street Gross pollutant trap – Ecosol RSF 6750

To prevent litter, debris and sediment from entering the Yarra River.

Yarra River 2000

Birrarung Marr Gross pollutant trap – Ecosol RSF 4450

To prevent litter, debris and sediment from entering the Yarra River.

Yarra River 2001

Cardigan Street Gross pollutant trap – Ecosol RSF 4450

To prevent litter, debris and sediment from entering the Elizabeth Street main drain.

Yarra River 2003

A’Beckett Street Gross pollutant trap – Ecosol RSF 4450

To prevent litter, debris and sediment from entering the Elizabeth Street main drain.

Yarra River 2003

Franklin Street Gross pollutant trap – Ecosol RSF 4450

To prevent litter, debris and sediment from entering the Elizabeth Street main drain.

Yarra River 2003

Swanston Street Gross pollutant trap – Ecosol RSF 4900

To prevent litter, debris and sediment from entering the Yarra River

Yarra River 2004

Clarendon Road Trash rack To protect the hydraulic integrity of floodgates and prevent coarse litter and debris from entering the Yarra River.

Yarra River 1995

Queensbridge Street

Trash rack To protect the hydraulic integrity of floodgates and prevent coarse litter and debris from entering the Yarra River.

Yarra River 1995

Royal Park Gross pollutant trap

To prevent litter, debris and sediment from entering the Moonee Ponds Creek.

Moonee Ponds Creek

2002

Chelmsford Street Release net – Net Tech

To prevent litter, debris and sediment from entering the Moonee Ponds Creek.

Moonee Ponds Creek

2002

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Location Litter Traps Purpose Ultimate receiving waterway

Installed

Footscray Road Release nets (x2) – Net Tech

To prevent litter, debris and sediment from entering the Moonee Ponds Creek.

Moonee Ponds Creek

2002

Laurens Street Trash rack To protect the hydraulic integrity of floodgates and prevent coarse litter and debris from entering the Maribyrnong River.

Moonee Ponds Creek

1996

Hobsons Road Trash rack To protect the hydraulic integrity of floodgates and prevent coarse litter and debris from entering the Maribyrnong River.

Maribyrnong River

1993

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Appendix D – Stormwater Pollutants

Urban-derived litter causes high visual impacts, potential to contribute to a reduction in stormwater drainage capacity and when deposited in the receiving waters litter poses a threat to the aquatic ecosystem9. Studies have found that human-derived litter makes up approximately 25% to 30% of the total gross pollutant load carried in urban stormwater10. Cigarette litter is a major source of pollutant. Studies have shown that cigarette butt litter comprises 58% of all items littered in public places around Australia11. The residue in cigarette butts contains toxic and soluble chemicals which impact on the health, safety and visual quality of our environment.

Organic material (ie. vegetation such as leaves and twigs) constitutes the largest proportion of gross pollutants carried by stormwater, however vegetation is not a major source of nutrients compared to other pollution sources12.

Commercial, industrial and residential runoff may be contaminated by oil, petrol and fertilisers from poor management practices, accidental spills and illegal discharges. Commercial and industrial areas are often impervious and therefore contaminants are easily washed away by rainfall into the stormwater system.

Construction site runoff may contain heavy loads of sediment caused by uncontrolled wash down of equipment and vehicles, exposed soil surfaces and stockpiles and concrete spills.

9 Breen, P. and Lawrence, I., Australian Runoff Quality Guidelines (Draft), June 2003

10 Allision, R.A., Chiew F.H.S., McMahon, T.A., 1997, Stormwater Gross Pollutants, Industry Report 97/11, Cooperative Research Centre for Catchment Hydrology

11 Community Change, 2001

12 Allision, R.A., Chiew F.H.S., McMahon, T.A., 1997, Stormwater Gross Pollutants, Industry Report 97/11, Cooperative Research Centre for Catchment Hydrology

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Glossary of Terms

annual exceedance probability (AEP): (measured as a percentage) is the long-term probability between floods of a certain magnitude. For example, a 1% AEP flood is a flood that occurs on average once every 100 years (also referred to as the ‘100 year flood’ or 1 in 100 year flood’).

average recurrence interval (ARI): (measured in years) is a term used to describe how likely a flood is to occur in a given year. For example, a 20 year ARI flood is a flood that occurs, or is exceeded on average once every 20 years.

EPA: Environment Protection Authority (Victoria)

GPT: Gross Pollutant Trap

head loss: the potential energy, which is lost when fluid flows through a pipe. Head loss will increase with obstructions in the pipe, pipe restrictions or friction.

litter traps: include gross pollutant traps, release nets and trash racks

nuisance flooding: Described as stormwater runoff generated from rainfall events with an Average Recurrence Interval (ARI) up to 10 years.

overland flow: Overland flow is defined as flow which is generated as a result of a storm event, where the flow is in excess of what the pipe system can carry.

routine maintenance: defined as the immediate, urgent and short term corrective maintenance work of limited scope.

stormwater pollutant: any material that upon entering the stormwater system, degrades the quality of stormwater to the detriment of the environment. It includes litter, sediment, soil, mud, sand, concrete, plaster, brick and tile dust, paint and acid.

severe storm event: Described as a rainfall event with an ARI up to 100 years.

stormwater: rainfall collected after as runoff from urban surfaces (roads, pavements, rooftops, carparks and vegetated open space)

trash rack: installed in stormwater drains, often on outfall drains to receiving waters and are used to trap floating and submerged litter. Consist of vertical or horizontal steel bars.

Attachment 2 Agenda Item 5.2

Environment, Sustainability and Indigenous Affairs Committee 22 April 2004

1

SUSTAINABILITY ASSESSMENT Drainage Plan 2004 – 2009

Theme: Organisational issues Question 1: Internal Issues Is this issue an internal administrative issue? If so, how does improve organisational processes? Note: if this issue does not directly impact the municipality, please select 'not applicable' from the Impact list for the remainder of the questions. Comments: The Drainage Plan 2004 - 2009 will provide a strategic focus for longer term planning and management of Council's stormwater drainage assets. Theme: Social Factors Question 2: Community Services What effect will the proposal have on the quality, quantity and accessibility of education, leisure, cultural, health and other community services? Impact: no impact Question 3: Active and Engaged Community What effect will this proposal have on the development of a culturally diverse, healthy, equitable, active and involved community in Melbourne? Impact: no impact Question 4: Cultural and Heritage Value of Built Form What effect will this proposal have on the cultural heritage of Melbourne's neighbourhoods and buildings? Impact: no impact Question 5: Transport and Accessibility What effect will the proposal have on the level of public transport and number of transport options/connections with the City of Melbourne? Impact: no impact Question 6: Welcoming and Safe Public Space What effect will the proposal have on the safety and amenity of the public environment eg streets, laneways, parks and gardens? Impact: positive Likelihood: medium Magnitude: moderate Comments: Amenity issues will be partially addressed through stormwater related education programs for residents, businesses and visitors.

2

Theme: Environmental Factors Question 7: Energy Use and Greenhouse Emissions What effect will the proposal have on energy consumption and greenhouse gas emissions associated with Council and/or community activities? Impact: no impact Question 8: Resource Use and Waste Generation What effect will the proposal have on the total quantity and type of waste, including prescribed waste, generated by Council and/or community activities? Impact: positive Likelihood: low Magnitude: minimum Question 9: Pollution What effects will the proposal have on the use of hazardous materials and levels of pollution (air, noise, soil, and water) in the region? Impact: positive Likelihood: high Magnitude: moderate Comments: New and continued initiatives for improving stormwater quality are recommended, including education and awareness campaigns, monitoring and the provision of infrastructure (such as litter traps). Question 10: Water Consumption What effect will the proposal have on the quantity of water consumed and disposed of by the Council and/or in the municipality? Impact: no impact Question 11: Flora and Fauna What effect will this proposal have on flora and fauna in the City of Melbourne on private and public land and in the aquatic environment? Impact: positive Likelihood: high Magnitude: moderate Comments: Through implementing initiatives to improve stormwater quality, the receiving waterways will benefit. Theme: Economic Factors Question 12: Development of Key Business Sectors What effect will the proposal have on the number and type of businesses and level of business investment in the City of Melbourne? Impact: no impact

3

Question 13: Transport Infrastructure What effect will the proposal have on Melbourne's transport infrastructure? Impact: no impact Question 14: Communications Infrastructure What effect will the proposal have on Melbourne's information technology and telecommunications infrastructure? Impact: positive Likelihood: medium Magnitude: maximum Comments: The Drainage Plan 2004 - 2009 seeks endorsement to proceed with a drainage asset information system that contains network data in Geographical Information System (GIS) form. This is seen as a cornerstone to improving drainage management. Question 15: Business Innovation What effect will the proposal have on research and development in Melbourne? Impact: no impact Question 16: Job Creation What effect will the proposal have on the number and types of jobs available in the City of Melbourne? Impact: no impact

Agenda Item 5.2 Environment, Sustainability and Indigenous Affairs Committee

22 April 2004

FINANCE ATTACHMENT

DRAINAGE PLAN 2004 – 2009

The Drainage Plan lists new funding initiatives of $475,000 over a five year budget period. This new funding will be sought through the annual Council and recurrent budget processes.

Funding for the construction and renewal of drainage assets will be subject to the annual Council Works budget processes.

Kerrie Jordan Acting Manager Financial Services

Agenda Item 5.2 Environment, Sustainability and Indigenous Affairs Committee

22 April 2004

LEGAL ATTACHMENT

DRAINAGE PLAN 2004-2009

Section 198 of the Local Government Act 1989 (“the Act”) provides that, other than sewers and drains vested in another Council or a Minister, the Crown or any public body, the following are vested in the Council and are under the management and control of the Council:

“(a) public sewers and drains within the municipal district;

(b) sewers and drains in and under roads in the municipal district;

(c) Works and materials relating to (a) and (b).”

Section 3E of the Act states that the functions of a Council include:

“(b) planning for and providing services and facilities for the local community;

(c) providing and maintaining community infrastructure in the municipal district.

Under section 3F of the Act, Council also has the power to do all things necessary and convenient to be done in connection with the achievement of its objectives and performance of its functions.

The recommendation is therefore made in accordance with the Council's functions and powers as set out in the Act.

Kim Wood Acting Manager Governance Services