Mornington Peninsula Shire Council Stormwater Management Plan Volume II
Offices
Prepared For: Mornington Peninsula Shire Council Brisbane Denver Karratha Prepared By: WBM Oceanics Australia Melbourne Morwell Newcastle Sydney Vancouver
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 DOCUMENT CONTROL SHEET
WBM Oceanics Australia Document: R.M00215.001.02.MPSCSWMP.Vol2.NS. doc Melbourne Office: Title: Mornington Peninsula Shire Council Level 5, 99 King Street Stormwater Management Plan Volume II MELBOURNE VIC 3000 Project Manager: Dr Nicholas Somes Australia Author: Dr Nicholas Somes
PO Box 604 Client: Mornington Peninsula Shire Council Collins Street West VIC 8007 Client Contact: Paul Healy Telephone (03) 9614 6400 Client Reference: 001625 Facsimile (03) 9614 6966 www.wbmpl.com.au Synopsis: This report outlines Volume II of the Stormwater Management Plan Developed ACN 010 830 421 for Mornington Peninsula Shire Council. Volume II contains an outline of the process used to develop the plan and detailed recommendations and implementation framework.
REVISION/CHECKING HISTORY
REVISION DATE CHECKED BY ISSUED BY NUMBER 0 20/3/00 WJW NLGS 1 20/6/00 SVR NLGS 2 24/6/02 AL NLGS
DISTRIBUTION
DESTINATION REVISION 0 1 2 3 4 5 6 7 8 9 10 Mornington Peninsula Shire Council 2 2 2 WBM File 1 1 1 WBM Library 1
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 CONTENTS I
CONTENTS
1 INTRODUCTION 1
1.1 The Stormwater Initiative 1 1.2 What is Stormwater Pollution and Management 2 1.3 The Nature of Stormwater Management in Local Government 2 1.4 The Project Study Team 3
2 THE STORMWATER MANAGEMENT PLANNING PROCESS 4
2.1 Stormwater Management Plan Objectives 4 2.2 Overview of Study Process 4 2.3 Key Outcomes of the SWMP 5 2.4 Stakeholder Consultation and Involvement 5 2.4.1 Project Working Group Establishment 7 2.4.2 Project Working Group Workshop Overview and Outcomes 7
3 MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 8
3.1 Municipal Overview 8 3.2 Land Use Characteristics 10 3.3 Waterway and Hydrological Characteristics 12 3.4 Stormwater Management Roles, Responsibilities and Jurisdictions 17 3.5 Existing MPSC Stormwater Management Practices and Activities 19 3.5.1 Education and Awareness Programs 19 3.5.2 Source Controls 20 3.5.3 Structural Treatments 21 3.5.4 Regulation and Enforcement 21 3.6 Stormwater Management Activities Conducted by Other Agencies 21 3.7 Regional Strategies, Frameworks and Legislation 22 3.7.1 State Environment Protection Policy (The Waters of Victoria) 22 3.7.2 Port Phillip and Westernport Regional Catchment Strategy 23 3.7.3 Westernport Catchment Action Plan 23
4 SUMMARY OF PREVIOUS STUDIES AND GIS INFORMATION 25
4.1 Prior Studies 25
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 CONTENTS II
4.2 GIS Data 25
5 STORMWATER THREATS 27
5.1 Adopted Approach for Identifying Threats 27 5.2 Threat Types and the Nature of Pollution 27 5.3 Mornington Peninsula Shire Council Pollutant Sources and Threats 29 5.3.1 Residential Land Use Runoff 30 5.3.2 Industrial Land Use Runoff 30 5.3.3 Commercial Land Use Runoff 31 5.3.4 Major Road Runoff 31 5.3.5 Unsealed Road Runoff 31 5.3.6 Residential Development 32 5.3.7 Building Site Runoff (Lot Scale) 33 5.3.8 Unstable and Degraded Waterways 34 5.3.9 Flow Modification 34 5.3.10 Landfill and Contaminated Sites 34 5.3.11 Septic and Sewer Leakage 34 5.3.12 Agriculture 35 5.3.13 Docks and Wharves 36 5.3.14 Other 37 5.4 Summary of Stormwater Threats 37
6 VALUES IN RECEIVING ENVIRONMENTS 39
6.1 Adopted Approach For Identifying Values 39 6.2 Summary of Receiving Environmental Values within Mornington Peninsula Shire Council 41 6.2.1 Watsons Creek 41 6.2.2 Olivers Creek 41 6.2.3 Kings Creek and Hastings Township 42 6.2.4 Warringine Creek 42 6.2.5 Crib Point 43 6.2.6 Merricks Creek 43 6.2.7 Shoreham 43 6.2.8 Flinders 44 6.2.9 Cape Schanck 44 6.2.10 Nepean 44 6.2.11 Chinamans Creek 45 6.2.12 Rosebud 45
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 CONTENTS III
6.2.13 Dromana 46 6.2.14 Safety Beach 46 6.2.15 Mt Martha 46 6.2.16 Balcombe Creek 47 6.2.17 Mornington 47 6.2.18 Mt Eliza 48 6.2.19 Regional Receiving Environments 48 6.3 Summary of Receiving Environment Values 49
7 STORMWATER RISK ASSESSMENT 51
7.1 General Approach to Risk Assessment 51 7.2 Scoring of Threats and Values 51 7.3 Sensitivity 52 7.4 Risk Evaluation 52
8 MANAGEMENT FRAMEWORK REVIEW 57
8.1 Management Framework Functions 57 8.2 Organisational Structure 59 8.2.1 Infrastructure and Physical Services 59 8.2.2 Planning and Environment 61 8.2.3 Executive 62 8.3 Regional Drainage Responsibility 62 8.4 Development Planning and Approvals 62 8.4.1 Overview of Development within the Shire 62 8.4.2 Planning Permits 63 8.4.3 Internal Referrals 64 8.4.4 External Referrals 64 8.5 Strategic Planning 65 8.6 Co-ordination 65 8.7 Communication 66 8.7.1 Inter Departmental Communication 66 8.7.2 Inter Agency Communication 66 8.7.3 Community 66 8.8 Resourcing 67 8.9 Documentation 67 8.9.1 Strategic Documentation 67 8.9.2 Geographical Information system (GIS) 68
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 CONTENTS IV
8.10 Regulation and Enforcement 68
9 PRIORITY MANAGEMENT ISSUES 69
9.1 Identification of Key Stormwater Issues 69 9.2 Stormwater Risk Issues 69 9.3 Key Management Framework Issues 73 9.4 Stormwater Risk and Management Framework Linkages 73
10 STORMWATER RISK M ANAGEMENT STRATEGIES 77
10.1 Stormwater Risk Management Strategy Formulation 77 10.2 Management Element Screening 78 10.2.1 Generic Management Element Descriptions 78 10.2.2 Management Element Screening Results 79 10.3 Management Element Opportunity Assessment 87 10.4 Stormwater Risk Management Strategy Formulation 106 10.4.1 Objective of Management Strategy Formulation 106 10.4.2 Approach to Management Strategy Formulation 106 10.4.3 Results of Cost Effectiveness Analysis 108 10.4.4 Reactive Management Strategies 108
11 MANAGEMENT FRAMEWORK STRATEGIES 125
11.1 Adopted Approach 125 11.2 Management Action Costs 125 11.3 Responsibility for Implementation 126 11.4 Priority for Implementation 126 11.5 Cross Referencing with Risk Management Strategies 126 11.6 Management Framework Strategies 126
12 PLAN IMPLEMENTATION AND REVIEW 135
12.1 Implementation Approach 135 12.1.1 Implementation Framework and Participation 135 12.1.2 Optimising Implementation Efficiency 136 12.2 Priorities For Implementation 137 12.2.1 Management Framework Recommendations 137 12.2.2 Reactive Management Strategies 137 12.3 Implementation Monitoring and Review Process 138 12.4 Funding and Budget Allocation 138
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 LIST OF FIGURES V
13 CONCLUSIONS 140
14 REFERENCES 141
LIST OF FIGURES
Figure 2.1 SWMP Study Process 6 Figure 3.1 Mornington Peninsula Shire Council Locality Plan 9 Figure 3.2 Existing Land Use Distribution 11 Figure 3.3 Study Subcatchments 14 Figure 3.4 Regional drainage responsibilities throughout Mornington Peninsula Shire Council 18 Figure 5.1 Residential subdivision works in the Hastings and Kings Creek subcatchment 32 Figure 5.2 An example of a bin used for building site waste management 33 Figure 5.3 An example of poor Building site sediment and erosion control 33 Figure 5.4 Market garden in the Watsons Creek subcatchment 36 Figure 5.5 An example of fertilizer storage in market gardens in the Watsons Creek subcatchment 36 Figure 7.1 Adopted Process For Risk Assessment 51 Figure 8.1 MPSC Organisational Structure (Shading indicates business unit or group is involved with Stormwater management) 60 Figure 9.1 Study Process and Strategy Development 69 Figure 10.1 Three Step Stormwater Risk Management Strategy Formulation 78
LIST OF TABLES
Table 2.1 Project Working Group Discussions Topics and Key Objectives 7 Table 3.1 Study subcatchment characteristics 13 Table 4.1 Summary of Background Material 26 Table 5.1 Generic Threat Types and Key Pollutants 28 Table 5.2 Pollutant Impacts and Time Scales 29 Table 5.3 Summary of Stormwater Threats within Mornington Peninsula Shire Council 38 Table 6.1 Receiving Value Types 40 Table 6.2 Summary of Stormwater Environmental Values within Mornington Peninsula Shire Council 50 Table 7.1 Score System for Threats, Values and Sensitivity 52 Table 7.2 Risk Evaluation Results Balcombe Creek 53 Table 7.3 Summary of Top 73 Risks 55
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 LIST OF TABLES VI
Table 7.4 Summary of Top 73 Risks 56 Table 9.1 Summary of Top 73 Risks and Issue Groupings 71 Table 9.2 Summary of Top 73 Risks and Issue Groupings (continued) 72 Table 9.3 Summary of Risk and Management Framework Linkages 74 Table 10.1 Management Element Descriptions 83 Table 10.2 Summary of Possible Management Elements (Element Screening Results) 86 Table 10.3 Stormwater Risk Issue 1, Management Element Opportunities 88 Table 10.4 Stormwater Risk Issue 2, Management Element Opportunities 89 Table 10.5 Stormwater Risk Issue 3, Management Element Opportunities 91 Table 10.6 Stormwater Risk Issue 3, Management Element Opportunities 92 Table 10.7 Stormwater Risk Issue 4, Management Element Opportunities 93 Table 10.8 Stormwater Risk Issue 5, Management Element Opportunities 95 Table 10.9 Stormwater Risk Issue 6, Management Element Opportunities 96 Table 10.10 Stormwater Risk Issue 7, Management Element Opportunities 98 Table 10.11 Stormwater Risk Issue 8, Management Element Opportunities 99 Table 10.12 Stormwater Risk Issue 9, Management Element Opportunities 100 Table 10.13 Stormwater Risk Issue 10, Management Element Opportunities 101 Table 10.14 Stormwater Risk Issue 11, Management Element Opportunities 103 Table 10.15 Stormwater Risk Issue 12, Management Element Opportunities 105 Table 10.16 Strategy Formulation Criteria 106 Table 10.17 Correlation of Quantitative and Qualitative Measures for MCA 107 Table 10.18 Stormwater Risk Issue 1, Agricultural Runoff in Watsons Creek 111 Table 10.19 Stormwater Risk Issue 2, Septic Tank Systems with the Nepean Peninsula 112 Table 10.20 Stormwater Risk Issue 3, Subdivisional Developments Throughout the Municipality 113 Table 10.21 Stormwater Risk Issue 4, Market Gardens in Chinamans Creek 115 Table 10.22 Stormwater Risk Issue 5, Waterway Degradation in Mt Martha 116 Table 10.23 Stormwater Risk Issue 6, Building Site Runoff in Balcombe Creek and Mt Martha 117 Table 10.24 Stormwater Risk Issue 7, Residential Runoff Throughout the Municipality 118 Table 10.25 Stormwater Risk Issue 8, Management of Unsealed Road Runoff 119 Table 10.26 Stormwater Risk Issue 9, Management of Septic Tanks in Flinders 120 Table 10.27 Stormwater Risk Issue 10, Management of Commercial Areas on the Nepean Peninsula 121 Table 10.28 Stormwater Risk Issue 11, Management of Commercial Areas on the Nepean Peninsula 122 Table 10.29 Stormwater Risk Issue 12, Management of Waterway Degradation in Merricks Creek and Shoreham Subcatchments 123 Table 10.30 Stormwater Risk Issue 13, Management of Septic Tanks Systems in Merricks Creek and Shoreham Subcatchments 124
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 LIST OF TABLES VII
Table 11.1 Framework Strategy 1 – Regional Drainage Responsibility 127 Table 11.2 Framework Strategy 2 – Interagency Communication 128 Table 11.3 Framework Strategy 3 – Strategic Direction 129 Table 11.4 Framework Strategy 4 – Inter-Departmental Communication and Officer Education 130 Table 11.5 Framework Strategy 5 – Referral Process and Planning Permits 131 Table 11.6 Framework Strategy 6 – Resourcing and Plan Implementation 132 Table 11.7 Framework Strategy 7 – Community Communication, Education and Local Laws 133 Table 11.8 Framework Strategy 8 – Drainage System Documentation 134
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 INTRODUCTION 1
1 INTRODUCTION
WBM Oceanics Australia was commissioned by Mornington Peninsula Shire Council to develop a Stormwater Management Plan (SWMP) for the municipality. The SWMP has been developed to guide the Shire in improving the environmental management of stormwater throughout the municipality.
The SWMP provides a framework for integrating stormwater management as part of Council’s existing management and planning activities. In this regard, the SWMP is intended to provide the basis for an ongoing process to protect and enhance receiving environmental values currently threatened by stormwater runoff. In most municipalities the primary aim of the SWMP is the management of runoff from urban areas, however, the unique nature of Peninsula has required the development of a SWMP that considers the diversity of landuses within the municipality. In this regard the SWMP considers the entire municipality, but has particular reference to the impacts of urban stormwater on receiving environments.
The Stormwater Management Plan has been prepared in 3 volumes with this report constituting Volume II. Volume II provides detailed information on: · the approach adopted in developing the Plan; · recommendations aimed at responding to existing threats to environmental values; and · suggested improvements to Council’s management framework to limit the occurrence of stormwater threats in the future .
The following information is presented in Volumes I and III of the plan: · Volume I –provides an executive summary of the methodology and outcomes of the Plan. · Volume III – is a compilation of appendices that accompany Volume II.
1.1 The Stormwater Initiative
Stormwater Management Plans for local authorities in the Melbourne Metropolitan area (including Mornington Peninsula) are being developed in accordance with a state government initiative, the “Stormwater Agreement”, supported by Melbourne Water, the Environment Protection Authority and the Municipal Association of Victoria. The support includes the provision of financial and technical assistance to local authorities to assist them in the development of their SWMP’s.
The State Government initiative has involved the creation of a “Stormwater Agreement” between the various parties, which has lead to the development of the Best Practice Environmental Management (BPEM) Guidelines for Urban Stormwater and the implementation of a program to prepare Stormwater Management Plans for all metropolitan municipalities. The BPEM Guidelines provide a framework for the development of SWMP’s which has been applied in developing Mornington Peninsula Shire Council’s Stormwater Management Plan.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 INTRODUCTION 2
1.2 What is Stormwater Pollution and Management
Modification of the natural characteristics of a catchment, through processes such as land use change and development, has a significant impact on the nature of stormwater runoff. These changes are generally manifest in: · modifications to the natural flow regime; · the modification of existing pollutant sources and export rates; and · the creation of new pollutant sources.
In particular, the process of development causes increased runoff volumes and the introduction of a variety of pollutant sources and sediments. These pollutants become entrained in stormwater runoff and are efficiently delivered to the receiving environment. Their accumulation within the receiving environment can result in severe and often irreversible impacts, which ultimately affect the quality of life enjoyed by the community.
Stormwater management is concerned with the development and implementation of a range of strategies to minimise the impacts of stormwater pollution and protect the values of the receiving environment. Stormwater pollution in urban areas is generally generated across a wide area and can be managed at a number of points within the catchment, i.e. at source, in-transit and at the outlet of the catchment. Therefore a stormwater management strategy will typically combine a number of elements to target pollutants from different sources and at different points within the catchment. Strategies can be formulated with a combination of both non-structural and structural measures. Non- structural measures include the application of a range of planning controls, management practices and education programs to prevent stormwater pollution from being generated. Structural measures are physical works undertaken to either reduce the volume of stormwater pollution generated or to treat stormwater runoff to remove pollutants.
The development of a Stormwater Management Plan involves the selection, grouping and recommendation of different measures as part of strategies aimed at protecting receiving environmental values defined by the community.
1.3 The Nature of Stormwater Management in Local Government
Local government plays an important role in managing stormwater at a local and often regional level. Local government’s day to day management function with respect to land use planning, infrastructure, interaction with the local community and the provision of services provides an ideal basis for managing stormwater to achieve local and regional environmental outcomes. In this regard, stormwater management activities usually occur within local government via: · The implementation and management of infrastructure, programs and plans specifically aimed at mitigating identified stormwater pollution threats (eg. a gross pollutant trap); and · Ongoing day to day activities which form a part of Council’s management framework including planning, coordination, communication, development approvals, policy, regulation and education.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 INTRODUCTION 3
The first of these activities can be labelled as reactive stormwater management, while the second can be labelled as pro-active. If Council’s management framework (ie. ongoing activities) is operating effectively, this reduces the need for reactive stormwater management through the implementation of site specific mitigation devices and plans.
The development of this Stormwater Management Plan will specifically focus on guiding Mornington Peninsula Shire Council in the long-term improvement of their management framework as well as recommending a range of specific management strategies to mitigate existing stormwater threats.
1.4 The Project Study Team
An experienced team of engineers and planners has developed Mornington Peninsula Shire Council’s Stormwater Management Plan. The study was project managed and led by WBM Oceanics Australia, with assistance from UrbanEdge Consultants.
Key members of the study team, their roles and affiliations are summarised as follows: · Dr Nicholas Somes (WBM) - Project Manager · Wesley Walden (WBM) – Project Director · Jaci Lowe (UrbanEdge) – Statutory and Strategic Planner
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 THE STORMWATER MANAGEMENT PLANNING PROCESS 4
2 THE STORMWATER MANAGEMENT PLANNING PROCESS
2.1 Stormwater Management Plan Objectives
In accordance with the Best Practice Environmental Management Guidelines, the primary objective of the Mornington Peninsula Shire Council Stormwater Management Plan is to improve the environmental management of stormwater throughout the municipality. This essentially involves the development of a stormwater management framework that can be integrated within Council’s existing planning and management framework and provides specific management recommendations.
To achieve the overall objective of the SWMP, a number of specific study objectives have been adopted which also reflect the approach adopted in developing the plan and its proposed application. These objectives include: · Review Council’s internal management framework and identify deficiencies which inhibit effective stormwater management; · Identification of receiving environmental values held by the community which may be threatened by stormwater runoff; · Identification of specific stormwater threats which do, or potentially could, stress the receiving environment; · Assessment of risks to values posed by specific threats; · Identification and prioritisation of key issues relating to stormwater risks and management framework; · Provision of strategies to respond to key issues; and · Development of a implementation and review process for the ongoing management of the study.
2.2 Overview of Study Process
The approach which has been adopted in preparing Mornington Peninsula Shire Council’s SWMP is consistent with the overall process defined in the revised Chapter 3 of the Best Practice Environmental Management (BPEM) Guidelines for Stormwater Management (Victorian Stormwater Committee, 1999). These guidelines define a staged process based on four study phases: 1. Preliminary Activities; 2. Identification of Priority Management Issues; 3. Development of the Stormwater Management Plan; and 4. Finalisaton of the Stormwater Management Plan.
This process has been applied in developing Mornington Peninsula Shire Councils Stormwater Management Plan by considering stormwater management in terms of Council’s current management framework and responses to existing threats. These concepts are described in more detail as follows:
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 THE STORMWATER MANAGEMENT PLANNING PROCESS 5
· The Management Framework – identifying deficiencies in the management framework and recommending improvements to assist Council in its ongoing day to day planning, design and management activities; · Responses to Existing Stormwater Risks – identification and prioritisation of issues based on an assessment of values, threats and risks to form the basis for the formulation of responsive strategies to manage and minimise impacts to priority values.
Figure 2.1 provides a schematic representation of the process adopted in developing the Stormwater Management Plan. A more detailed discussion of the specific approaches adopted in undertaking key components of the study is provided in the relevant subsections of this report.
2.3 Key Outcomes of the SWMP
The SWMP contains a number of outcomes that are targeted to assist Council to improve its management activities and respond to priority threats that may impact on environmental and amenity values. In this regard, key recommendations or outcomes of the SWMP include: · Specific Stormwater Risk Management Strategies that aim to respond to priority Stormwater Risk Issues in the municipality; · Recommendations for improvement of Council’s Management Framework to prevent stormwater degradation before it occurs; and · Identification of an Implementation and Review Program to guide Council in the implementation of the SWMP and continued Best Practice in Stormwater Management.
2.4 Stakeholder Consultation and Involvement
A key feature of the study process is the involvement of stakeholders as part of regular workshops at key stages throughout the development of the SWMP. These stakeholders participated as part of a Project Working Group that met on four occasions during the study, corresponding to each of the separate phases. The PWG was made up of Council Officers (engineers, planners, technical and maintenance staff) and representatives from regional management authorities (Melbourne Water and Environment Protection Authority).
Stakeholder involvement and commitment as part of the Stormwater Management Plan’s development is critical to its ultimate ability to achieve the proposed SWMP objectives. In this regard, the Project Working Group played a critical role in: · identifying local issues relevant to stormwater management; · defining receiving environmental values and threats; · participating in decisions regarding the prioritisation of stormwater management issues (both Stormwater Risk and Management Framework Issues); and · contributing to the development of management strategies and establishing the implementation framework.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 THE STORMWATER MANAGEMENT PLANNING PROCESS 6
Project Inception
PWG Workshop 1 Stage 1
Review Council's Review Local Management Framework Characteristics
Define Study Subcatchments
Identify Stormwater Receiving Environment Threats Values
PWG Workshop 2 Stage 2 Risk Assessment
Priority Management Issues Paper
PWG Workshop 3
Issues Paper Approval
Management Framework Reactive Management Strategies Strategies
Implementation Framework Stage 3
PWG Workshop 4
Submit Draft SWMP
Finalise SWMP Stage 4
Figure 2.1 SWMP Study Process
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 THE STORMWATER MANAGEMENT PLANNING PROCESS 7
Workshops generally commenced with a presentation by the study team, outlining relevant information which would form the basis for the workshop, followed by open discussion between the group regarding the particular issues being considered during each phase of the study.
A brief discussion paper was distributed to all workshop attendants approximately 1 week prior to each workshop. Appendix A, in Volume III, provides copies of each discussion paper.
The following subsections discuss the establishment of the Project Working Group and provide an overview of each Workshop.
2.4.1 Project Working Group Establishment
The Project Working Group (PWG) was established during the earlier stages of Phase 1 of the study, following discussions with Mornington Peninsula Shire Council, Melbourne Water and Environment Protection Authority. The PWG was mainly made up of council officers and reflected the range of organisational groups and community groups involved in stormwater management within the municipality.
Approximately 20 people accepted invitations to participate in the Project Working Group. A full listing of workshop participants and their affiliation is contained in Appendix B (Volume III).
2.4.2 Project Working Group Workshop Overview and Outcomes
Agendas for each PWG Workshop were formulated to achieve specific outcomes corresponding to each phase of the study. The key objectives of each workshop are summarised in Table 2.1. Table 2.1 Project Working Group Discussions Topics and Key Objectives
Workshop Discussion Topics Key Objectives Number 1 development of an understanding of the key concepts relating to stormwater management Study process and objectives establishment of a shared understanding of the process being adopted to develop the SWMP Available data and information identification of roles and responsibilities of the study team and Project Working Group identification of additional information sources Key stormwater management issues identification of key local issues relating to stormwater and environmental management 2 confirmation of PWG issues and Study Team’s understanding of their relevance Receiving values acceptance and agreement of generic stormwater threats Stormwater threats identification of, and agreement on, key stormwater threats in each sub-area identification of, and agreement on, key values in each sub-area Ranking of values and threats endorsement of ranking for values and threats; Management Framework Review final agreement from PWG on adopted values, threats and their magnitudes discussion of management framework 3 understanding and endorsement of the process adopted in risk evaluation and ranking Risk assessment and ranking confirmation of Management Framework Review outcomes and their ranking Management Framework Review confirmation of preliminary risks and their rankings confirmation of Stormwater Risk Management Issue Stormwater Management Issues 4 agreement on the process adopted in identifying and evaluating management options and strategies Management Strategy Development discussion of preliminary management options and strategies Implementation discussion of implementation framework
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 8
3 MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS
3.1 Municipal Overview
Mornington Peninsula Shire Council is a large municipality (720 square kilometres) located 50 km to the south of Melbourne. The municipality includes all of the Mornington Peninsula and supports a variety of landuses including residential, agricultural, commercial and industrial areas. The municipality was formed in 1996 following the amalgamation of Shires of Hastings, Flinders and Mornington and parts of the City of Frankston.
The Shires northern boundary is formed by the Cities of Frankston and Casey. The remainder of the shires border is coastline, which has a length of over 190 kilometres and includes Port Phillip, Western Port and Bass Strait (refer Figure 3.1). Urban areas within the municipality are divided into more than 20 townships. Many of these townships are located on or near the coastline and are bordered by rural areas. The coastline and townships are major tourist destinations with the population rising from 120,000 to 180,000 during the peak summer period.
Development along the Port Phillip coastline is nearly continuous from the municipal boundary at the northern end of the Shire to Portsea at the southern end of the municipality. Development along Bass Strait and Western Port is confined to a number of hamlets, with much of the coastal fringe contained within National Parks and State reserves. Figure 3.1 is a locality plan, which outlines surrounding municipalities, water bodies, the key townships and suburbs within the Shire.
Roads form the dominant transport network within the municipality, with major roads including; · Nepean Highway; · Moorooduc Road; · Mornington Peninsula Freeway; and · Western Port Highway.
The elevated areas that run along much of its length dominate the topography of the Peninsula. These elevated areas form a central spine that runs the length of the Peninsula and provide many points to view the Peninsula and the adjacent water bodies. Key topographical features include Mt Eliza, Mt Martha, Red Hill and Arthurs Seat.
The hydrology of the Shire is characterised by a high number of small catchments draining over relatively short distances to Port Phillip, Western Port or Bass Strait (refer Figure 3.1). With a few exceptions, the entire catchments of the waterways are contained within the municipal boundaries. Typically the upper reaches of these waterways are contained in rural or undeveloped areas, with urban areas near their outlets.
The landuse and hydrologic characteristics of the municipality are discussed in more detail in the following sections.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC 27/6/02 16:06 MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 9
Figure 3.1 Mornington Peninsula Shire Council Locality Plan
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 10
3.2 Land Use Characteristics
Mornington Peninsula Shire Council supports a wide variety of landuses. Urban development is concentrated along the shores of Port Phillip with a nearly continuous strip of development extending from Mt Eliza at the shires northern boundary to Portsea at the southwestern end of the Mornington Peninsula. The central part of the Peninsula is a largely a rural area containing a number of small townships. Development on the Bass Strait and Westernport coastlines is characterised by a series of small to medium sized townships on or near the coast, which are surrounded by rural areas. The two largest industrial areas within the municipality are located on Westernport to the north and south of Hastings.
Rural areas are the dominant landuse within the shire and comprise approximately 63% of the Shires area. The agricultural areas support a number of farming activities including grazing, market gardens, orchards, viticulture and poultry producers, with the majority of the farms being relatively small.
Urban areas within the municipality are divided into more than 20 townships. As was stated earlier much of the existing residential areas are located in a strip approximately 2 kilometres wide that extends along the Port Phillip coastline. The townships throughout the remainder of the municipality vary in size and are generally located within rural areas and are adjacent to the coast. The style of development varies considerably throughout the municipality, with each urban centre retaining its own unique characteristics.
There are a number of commercial precincts servicing the urban areas with the size and style varying considerably depending on the area that it services. The commercial areas in townships with a high level of tourist visitation, such as Sorrento, have numerous premises such as restaurants and cafes catering to the tourist trade.
The urban development boundaries of the townships within the municipality are fixed, with many of the townships approaching full development. The major area of new residential growth is occurring in Mornington and Mount Martha, with several developments in progress at any one stage. The developments are occurring in former rural areas and are usually in the order of 100 lots or less. Within the established areas ongoing development is occurring as people move to the Shire permanently and upgrade old holiday homes or build new homes.
The major industrial precinct located at Hastings includes the BHP Western Port Works, the Esso/BHP Petroleum Complex and an area proposed to be developed as a major port and freight- handling centre.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 11
Figure 3.2 Existing Land Use Distribution
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 12
3.3 Waterway and Hydrological Characteristics
Mornington Peninsula Council has numerous waterways draining to Port Phillip, Bass Strait and Western Port. With the exception of the Watsons Creek, Pearcedale South Drain and Kackeraboite Creek the entire catchments of the waterways are contained within the municipal boundary. Typically, the upper reaches of the waterways are contained in rural or undeveloped areas, and drain through urban areas to their outlets.
The character of the waterways varies significantly over the municipality reflecting the geology and topographic variations. The waterways vary from the flood plains on the eastern side of the municipality to the short steep waterways that characterise the escarpments of Mt Martha and Mornington. The municipality also contains an area at the western end of the Mornington Peninsula that has no overland drainage lines. In this area the stormwater is drained to soakage pits where it infiltrates into the groundwater table.
Throughout the municipality the condition of the waterways varies considerably. All waterways within the municipality have been impacted by development to some degree. The degree of impact is dependent on the historical and ongoing landuse practices within each catchment.
For the purposes of this study, the municipality has been separated into a series of subcatchments to simplify assessments and provide a basis for developing management strategies. The breakdown of study subcatchments has been based on hydrological catchment boundaries and major land use precincts. Using this approach, 18 separate study subcatchments have been defined. Their adopted reach names, waterways, catchment area, predominant landuse and receiving environment are summarised in Table 3.1.
Figure 3.3 shows the relative location of each of the 18 subcatchments. These subcatchments are referred to throughout the development of the Stormwater Management Plan, forming the basis for values, threats, risks assessments and reactive management strategy recommendations.
Each of the subcatchments referred to in this study are described in more detail as follows: · The Watsons Creek catchment consists of both Watsons Creek and Pearcedale South Drain. Watsons Creek is a permanent stream that forms in Frankston South and flows in a south easterly direction to Western Port. Pearcedale South Drain is an ephemeral drain that flows through farmland to Western Port. Parts of both catchments are located outside of the municipal boundary. Both streams have been highly modified with much of the riparian vegetation cleared and extensive works carried out to realign streams and increase hydraulic capacity. Most of the catchment areas are used for agricultural purposes, with agricultural industries including poultry farms, market gardens, vineyards and grazing properties. The major urban centre is Somerville. · Olivers Creek contains both Olivers Creek and McKirdys Drain. Olivers Creek is the major waterway, forming upstream of Tyabb and discharging into Western Port at Hastings. McKirdys Drain is an ephemeral stream that forms to the north of Hastings and flows to Western Port. Most of the catchment is rural, with areas of grazing, viticulture, poultry and market gardens. Residential development within the catchment is focussed around Tyabb and Hastings. Hastings is a conventional urban area with residential and industrial areas draining to Olivers Creek. Tyabb is a small township with a core of residential, commercial and industrial landuses.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 13 Table 3.1 Study subcatchment characteristics
Catchment Reach Catchment Waterway/s Predominant Landuse Waterway Features and Characteristics Receiving Environment Number Area Rural (Pastoral and Market Garden Areas) – 67% (20.3 km2) Highly modified natural and constructed Quail Island and Western Port Watsons Creek and Pearcedale Watsons Creek 39 km2 Low Density Residential Areas – 11% (4.2 km2) drainage lines 1 South Drain Residential Areas 9% (3.5 km2) Industrial – 54% (19.5 km2) – (Note: Much of this site is rural) Highly modified natural and constructed Western Port 2 2 Olivers Creek and McKirdys Rural – 20% (7.3 km ) drainage lines Olivers Creek 36 km 2 2 Drain Low Density Residential Areas – 14% (5 km ) Residential – 2% (0.7 km2) 2 Kings Creek and 2 Kings Creek and Hasting Local Rural – 66% (10.4 km ) Extensively modified natural and constructed Western Port 3 16 km 2 Hastings Township Drainage System Residential – 17% (2.8 km ) drainage lines Rural – 61% (13.6 km2) Highly modified natural and constructed Sandstone Island and Western Port 2 2 4 Warringine Creek 24 km Warringine Creek Low Density Residential – 23% (5.5 km ) drainage lines Residential – 6% (1.4 km2) Commonwealth 54% (14.9 km2) – HMAS Cerberus Naval Base Natural and constructed drainage lines Hanns Inlet and Western Port 2 2 Crib Point Drain & Marmaduke Rural 22% (7.9 km ) Crib Point 35 km 2 5 Creek Residential 8% (3.1 km ) Low Density Residential 8% (2.8 km2) 2 2 Rural 88% (54.2 km ) Highly modified natural and constructed Western Port Merricks Creek 62 km Merricks Creek 6 Residential 8% (4.9 km2) drainage lines Rural 90% (31.4 km2) Slightly modified natural and constructed Flinders Bight and Western Port Stony Creek, East Creek and Shoreham 35 km2 Low Density Residential 4% (1.4 km2) drainage lines 7 Camp Buxton Creek Residential 3% (0.9 km2) 2 2 Rural 80% (13.0 km ) Highly modified natural and constructed Kennon Cove, Western Port and Bass Strait 8 Flinders 16.2 km Spring Creek and Manton Creek 2 Residential 10% (1.7 km ) drainage lines Main Creek, Burrabong Creek, 2 Highly modified natural and constructed Flinders Bight, Western Port, Cairns Bay, 2 Rural 82% (81.7 km ) Cape Schanck 99 km Stockyard Creek and Tea Tree 2 drainage lines Bushrangers Bay and Bass Strait 9 Open Space 17% (16.9 km ) – Mornington Peninsula National Park Creek Rural 38% (28.8 km2) Surface waters infiltrate to groundwater Bass Strait, Port Phillip 2 2 10 Nepean 77 km Nepean Infiltration Area Residential 34% (25.9 km ) Open Space 15% (11.7 km2) – Mornington Peninsula National Park Rural 70% (29.2 km2) Highly modified natural and constructed Port Phillip 2 Chinamans Creek and Chinamans Creek 41 km Open Space 17% (6.8 km2) drainage lines 11 Tootgarook Wetlands Residential 10% (4.1 km2) Residential – 46% (9.4 km2) Moderately modified natural and constructed Port Phillip Wonga Creek, Coburn Creek, 2 2 Open Space - 28% (5.6 km ) drainage lines Rosebud 20 km Waterfall Creek and Rosebud 2 12 Rural - 14% (2.9 km ) South Creek Road – 7% (1.4 km2) Sheepwash Creek, Boundary Rural – 40% (7.5 km2) Highly modified natural and constructed Dromana Bay and Port Phillip 2 2 Road Creek, Kangerong Creek Residential - 28% (5.2 km ) drainage lines Dromana 19km 2 13 and Dromana Local Drainage Open Space - 22% (4.0 km ) – Arthurs Seat State Park System 2 2 Rural - 87% (43.1 km ) Highly modified natural and constructed Dromana Bay and Port Phillip Safety Beach 50 km Brokil Creek and Dunns Creek 14 Residential - 4% (2.2 km2) drainage lines Sheoak creek, Seaside Creek, Residential - 64% (4.3 km2) Natural and constructed drainage lines Port Phillip 2 2 15 Mt Martha 7 km Finlayson Creek Sunshine Creek Open Space - 17% (1.1 km ) – Mt Martha Public Park and Hearn Creek Private Establishment - 5% (0.4 km2) – Joseph Harris Scout Park Rural - 63% (69.1 km2) Extensively modified natural and constructed Port Phillip 2 2 16 Balcombe Creek 110 km Balcombe Creek Open Space - 17% (19.2 km ) – Devilbend Reservoir drainage lines, including Devilbend Reservoir Residential - 9% (10.5km2) – Much of this is still to be developed Residential - 54% (8 km2) Moderately modified natural and constructed Port Phillip Tanti Creek, Cook Street Drain, Rural - 12% (1.8 km2) drainage lines 2 2 17 Mornington 14 km Manmangur Creek and Caraar Industry – 7% (0.7 km ) Creek Open Space – 8% (1.2 km2) Mornington Golf Club – 4% (0.6 km2) Gunyong Creek, Earimil Creek, Residential – 80% (12.1 km2) Highly modified natural and constructed Port Phillip 2 2 18 Mt Eliza 15 km Ballar Creek and Kackeraboite Rural – 8% (1.3 km ) drainage lines Creek
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 14
Figure 3.3 Study Subcatchments
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 15
surrounded by an area of low density residential subdivisions. The other major landuse within the catchment is the industrial area at Hastings, which contains the BHP Western Port Works and Esso/BHP Petroleum Complex. · Kings Creek and Hastings Township catchment contains most of the developed area of the Hastings Township. Kings Creek forms in Tuerong and Moorooduc, flowing through an extensive flood plain before discharging into Hastings Bight. Much of the catchment has been cleared to establish agricultural and residential areas. The area of the Hastings Township that drains to this reach includes medium density residential areas, industrial areas and the commercial area. The township is drained by a conventional underground drainage system, discharging directly to either Kings Creek or Western Port. The natural waterways within this catchment have been heavily modified to increase hydraulic capacity and realign the original watercourses. · Warringine Creek catchment lies to the south of Hastings, with the creek forming the southern boundary of the Hastings Township. The upper reaches of the catchment are used for a variety of agricultural purposes, including grazing, poultry production, market gardens and viticulture. The catchment also has an area of low density rural living, that is located around the fringes of the Hastings Township. · Crib Point represents the area of the municipality that drains to Hanns Inlet and Crib Point. The sub-catchment contains several waterways, including Crib Point Drain, Naval Depot Creek and South Beach Road Creek. All of the waterways have small catchments and discharge to tidal areas. The catchment supports a variety of landuses including rural areas, residential areas in Bittern and Crib Point, a former refinery and the HMAS Cerberus Naval Base. · Merricks Creek is a large catchment within the municipality draining to Western Port. Much of the catchment is used for agricultural purposes including grazing, viticulture and orchards. The agricultural activities within the catchment have resulted in the clearing of most of the catchment and this has had a significant impact of the condition of riparian areas and catchment hydrology. The subcatchment contains the townships of Balnarring, Somers and Merricks. The Merricks Creek estuary is a site of regional geomorphological significance as it provides a good example of a multiple barrier system. · Shoreham consists of three waterways draining to Western Port. The waterways in this subcatchment are Stoney Creek, Camp Buxton Creek and East Creek. The upper sections of the catchments are rural areas and have been extensively cleared, although some areas of natural vegetation have survived. The township of Shoreham is a small township with areas of low and medium density residential development. · Flinders is a small sub-catchment that contains the township of Flinders. Dodds Creek and Spring Creek are the main waterways in this subcatchment. The upper reaches of the catchment are a rural area and have been extensively cleared. The Flinders Township is located near the coast and is mostly a medium density residential area with a small commercial area in the centre of town. The town is not sewered and it is thought that discharges from septic systems impact on the water quality within Dodds Creek. · Cape Schank is a large catchment draining to Bass Strait and Western Port. The catchment does not contain any urban areas. Agriculture and crown land are the dominant landuses.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 16
· Nepean refers to the area of the Nepean Peninsula west of the Selwyn Fault. The area contains Quaternary sedimentary deposits that include sands and dune limestone. The area is highly permeable and this combined with the dunal topography results in a landscape that does not have any waterways. Stormwater drainage within the area is achieved by the use of infiltration basins distributed throughout the catchment. The area is low lying and has a groundwater table that is often within 1 or 2 metres of the surface. The lower end of the catchment is a highly developed residential area containing several commercial precincts. · Chinamans Creek is a large catchment draining to Port Phillip. Chinamans Creek and the Drum Drum Alloc Creek are the major tributaries within the subcatchment, which also contains the Tootgarook Swamp. The Tootgarook Swamp is a significant natural asset covering 450 hectares (approximately 10% of the catchment), the area is extremely low lying and the water level in the swamp reflects the groundwater level. The swamp has been impacted significantly over time, in parts it has been drained, filled, grazed or used for intensive agriculture. The catchment contains a large area of market gardens upstream of the wetland. The downstream end of the catchment adjacent to Port Phillip is heavily developed, with medium density residential areas and several commercial areas. · Rosebud catchment includes many of the waterways that drain Arthurs Seat, which is a large granitic outcrop that dominates the catchment. The catchment is characterised by steep streams running off Arthurs Seat through the flat coastal fringe prior to discharging to Port Phillip. The major catchment is urbanised and contains mostly medium density residential areas. Several commercial precincts are located along Point Nepean Road. The upper reaches of the catchment contain agricultural areas and parts of the Arthurs Seat State Park. · Dromana encompasses the catchments of Sheepwash Creek, Boundary Road Creek and local drainage within the Dromana Town Centre. The catchments form on the northern and western slopes of Arthurs Seat and drain through the suburban areas of Dromana. The upper reaches of the catchment are either rural areas or part of the Arthurs Seat State Park. · Safety Beach Safety Beach refers the area drained by Dunns and Brokil Creek. It is a large catchment draining a central region of the Mornington Peninsula to Dromana Bay in Port Phillip. The catchment is predominantly an agricultural area with an urban fringe at its downstream end. The urban area includes the township of Safety Beach · Mt Martha is a small catchment that contains the waterways draining from the Mt Martha Escarpment to Port Phillip. There are several short steep creeks within this reach including Hearn Creek, Sunshine Creek and Finlayson Creek. Most of the catchment is an established residential area, although the upper reaches of the catchment contain a number of parks and a golf course. The waterways in this reach are often deeply incised and this has restricted the encroachment of development into the riparian area. · Balcombe Creek is the largest drainage catchment on the Peninsula. The catchment supports a diverse range of landuses with much of the upper reaches of the catchment rural areas and the lower reaches containing established and developing urban areas. The tributaries of Balcombe Creek have a trellised drainage pattern, with most of the waterways having either a north- westerly or south-westerly alignment. The drainage behaviour of Balcombe Creek during floods is unusual as the Moorooduc Plain can overtop and floodwaters flow out of the catchment into the Watsons Creek catchment.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 17
· Mornington is a small catchment draining to Port Phillip. The subcatchment is characterised by several short and steep catchments. Major drainage lines within the sub catchment include Manmangur Creek and Tanti Creek. The predominant landuse within the catchment is residential areas and it also contains commercial and industrial precincts. · Mount Eliza is located on the municipality’s northwest boundary. Waterways within the subcatchment include Gunyong Creek, Earimil Creek, Ballar Creek and Kackeraboite Creek. The waterways are characterised by small steep catchments and erosion of creek beds and valley slopes. Established residential areas make up most of the catchment. The catchment also contains a commercial precinct within Mt Eliza, several parks and a number of schools. The southern part of the catchment is a rural area.
3.4 Stormwater Management Roles, Responsibilities and Jurisdictions
Responsibilities for waterway and water infrastructure management within the Mornington Peninsula Shire are shared amongst a number of management authorities (local and regional) and other stakeholders. A key objective of this Stormwater Management Plan is the identification of coordination requirements between these parties to ensure that management activities and responsibilities are shared between those responsible.
The roles and responsibilities of key organisations are discussed as follows:
Mornington Peninsula Shire Council
Mornington Peninsula Shire Council are primarily responsible for land-use planning, land and stormwater management. Through the use of planning provisions, development approval conditions and engineering specifications, Council directs the nature of development within the municipality. In addition, Council are responsible for the long-term maintenance and management of stormwater drainage infrastructure, natural waterways, public assets such as roads and car parks, provision of services (eg. waste management) and management of public open space.
The Shire also fulfils the regional drainage management role for the parts of the municipality that fall outside of Melbourne Water’s jurisdiction. These areas encompass the parts of the municipality that were formerly the Shires of Flinders and Mornington (refer to Figure 3.4). The Shire is currently involved in negotiations with the State Government to resolve the regional drainage issue.
Melbourne Water Corporation
Melbourne Water is the regional drainage authority for the areas of the municipality that were formerly part of the Shire of Hastings and City of Frankston. Within these areas Melbourne Water is responsible for the management of major drains and waterways, generally in catchments greater than 60ha. The various roles of Melbourne Water include: · Regional Drainage and Flood Mitigation – this includes setting of drainage infrastructure standards, planning of regional drainage infrastructure in areas under development and operational responsibility for providing safe and effective conveyance systems (drainage) for stormwater runoff.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 18
Figure 3.4 Regional drainage responsibilities throughout Mornington Peninsula Shire Council (The Shaded area represents areas where Melbourne Water is regional drainage authority)
· Waterway Management – this role relates to the management, protection and rehabilitation of existing waterways to sustain and improve their environmental and functional integrity. Melbourne Water is responsible for a range of strategic planning, capital and operational works for a number of major waterways in the municipality. In the past, this has included the development of various Waterway Activity Plans, assessment of Waterway Condition and implementation of improvement works. · Water Quality Management – this includes planning, monitoring and implementation of mitigation works to protect and improve water quality in the receiving environment. Melbourne Water is responsible for overseeing and designing mitigation measures such as artificial wetlands. This includes review of proposed wetland designs as part of new developments in areas under their jurisdiction.
Melbourne Water also play a key role in developing standards and guidelines, such as the BPEM Guidelines for Urban Stormwater Management. In addition, Melbourne Water provide considerable technical assistance to local authorities such as Mornington Peninsula in developing Stormwater Management Plans and implementing management recommendations.
Environmental Protection Agency
The Environment Protection Authority is responsible for the protection of the quality of Victoria’s environment. The role of the Environment Protection Authority in stormwater management includes establishing environmental standards, encouraging the use of best practice in order to meet environmental standards and the application of regulatory and non-regulatory means to achieve these standards.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 19
VicRoads
VicRoads are responsible for Mornington Peninsula Highway and several major roads which run through the municipality. They are responsible for roadside drainage along the transport corridor and ensuring that stormwater which discharges to adjacent waterways does not cause adverse environmental impacts. VicRoads is responsible for the maintenance of the Mornington Peninsula Freeway with the Shire contracted to maintain the main roads owned by Vicroads.
VicTrack
VicTrack own lands which support railway infrastructure within the municipality. VicTrack are responsible for the management of drainage infrastructure and stormwater that discharges from these lands.
Port Phillip Catchment and Land Protection (CaLP) Board
The CaLP board plays a role in coordinating catchment management activities at a regional level to ensure protection of the receiving environment. In this regard, the board plays a role in education and awareness activities and facilitating coordination between different local and regional authorities to achieve regional environmental outcomes. The CaLP Board also plan on-ground catchment management works.
Special Interest Groups
A number of special interest, Landcare and “Friends” groups are active within the Mornington Peninsula Shire Council and represent a variety of interests. The groups are involved in a range of activities that include on-ground works and input to planning and management activities.
3.5 Existing MPSC Stormwater Management Practices and Activities
Existing stormwater management practices within the municipality were reviewed to gain an understanding of Council’s existing approach to stormwater management and likely capacity for implementing and maintaining recommendations made as part of this study. Council’s current approach to managing stormwater and the environment provides an insight into the types of activities which have been successful in the past and those which are likely to be supported in the future.
3.5.1 Education and Awareness Programs
Mornington Peninsula have developed and implemented a number of programs and strategies which contribute to improved environmental and stormwater management in the municipality. These programs and strategies include: · Waste Wise Program – this program provides a number of recommendations regarding improved waste management in the municipality. This includes information of the Shires website and regular updates in the local press and Shire newsletter, Peninsula Wide, outlining the responsibilities of builders and homeowners in the management of building site waste during home construction;
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 20
· Media Releases – The Shire distributes information to the community via a number of media sources. This includes the residents newsletter, Peninsula-Wide, local papers and the Shire’s website. Information distributed includes updates on a range of council activities and infrastructure programs, information on how residents can access services and advice on means of reducing the generation of pollution; and · Education Programs – Council supports a number of education programs, in particular the marking of drainage outlets and side entry pits by school and community groups.
3.5.2 Source Controls
The municipality undertakes a number of programs that are intended to prevent the generation of pollution at its source. These programs include street sweeping, beach cleaning and waste management in developed areas and on building sites. The source control programs are described in more detail below; · Street Sweeping – Mornington Peninsula Shire Council have a street sweeping program covering the entire municipality. The frequency of sweeping varies depending on the area and the time of year. For example commercial areas, are swept on a daily basis during the peak summer months. · Beach Cleaning – Council is responsible for the cleaning of 25 kilometres of coastline within the municipality, with most of the area cleaned contained within Port Phillip. Beaches, car parks and access tracks are cleaned by hand and machine, with machine cleaning occurring at least once a fortnight during the summer period (November to Easter). It also proposed to commence the cleaning of a number of beaches during the winter period in 2001. · Waste and Refuse Management – Council have a waste collection and recycling program to manage domestic and commercial wastes. This includes weekly kerb side collection of garbage and recyclable materials and provision of land fill services. Mobile bins are provided by Council and emptied weekly. Recycling occurs via a kerb side pick up for paper and household recyclable materials such as cans and bottles. The Mornington Peninsula Shire Council website provides a detailed list of recyclable materials and where they can be disposed of within the municipality. The shire is also responsible for the placement and maintenance of street bins, these are maintained by a council contractor on a performance based contract. The number and location of bins varies throughout the year depending on demand. · Construction Waste Management – Council have developed a program to both reduce and manage building site waste. Key components of the program include; § the encouragement and support of waste minimisation activities; § the requirement for all building sites to have and regularly empty a waste bin; § application of a Local Law (No. 1) in cases of non-conformance with regulations; and § the placement of conditions on permits. · Waterway Rehabilitation – A number of waterway rehabilitation projects have been undertaken in the past and are programmed for the future. The works have been undertaken to improve stream and riparian health, stabilise sites of erosion and improve channel conveyance. Tanti Creek in Mornington is an example of a site where works have been undertaken to remove non-indigenous
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 21
vegetation, improve channel conveyance, establish indigenous vegetation and place riffle zones in the creek.
3.5.3 Structural Treatments
Stormwater quality and environmental management initiatives adopted by Mornington Peninsula Shire Council include a combination of both structural and non-structural measures and programs. Structural measures have typically been implemented via: · incorporation of structural measures and water management initiatives as part of new residential development; · retrofitting of structural measures into the existing drainage system; and · management initiatives instigated by council and/or regional authorities such as Melbourne Water or South East Water.
Key structural devices implemented by the Shire include: · Gross Pollutant Traps – The Shire currently maintains a number of gross pollutant traps. These traps are located within the underground stormwater drainage network on catchments draining to Port Phillip. The traps have been placed with the aim of reducing the litter loads from commercial areas and sediment loads from new residential areas. Units have been installed downstream of commercial areas in Rosebud and Dromana and in a number of residential areas including Balcombe Creek. · Artificial Wetlands and Sedimentation Basins – A number of the newer residential developments within the municipality utilise open water as an integral part of their design. This has resulted in the construction of various lakes, wetlands and sedimentation basins that usually perform multiple roles relating to stormwater management, recreational and aesthetic amenity. Council have recently completed the construction of the Serpentine Wetlands, a combined wetland and retarding basin, in Mornington East. The wetland is located at the downstream end of a new residential subdivision and is intended to improve the quality of stormwater entering Balcombe Creek.
3.5.4 Regulation and Enforcement
This, previously mentioned, strategy was developed to target construction site waste. It includes an opportunity to issue infringement notices ($200 fine) to building contractors who do not maintain their sites in an adequate manner. The regulatory mechanism is intended to support the other programs outlined in section 3.5.2.
3.6 Stormwater Management Activities Conducted by Other Agencies
Other management authorities that have a management interest in lands or waterways within the municipality have also implemented various stormwater management initiatives. These are discussed as follows: · Melbourne Water Corporation is responsible for regional drainage in the areas of the municipality that were formerly parts of the Shire of Hastings and the City of Frankston. In the remainder of the municipality there is no designated regional drainage authority, although the
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 22
Shire assumes much of this responsibility. Melbourne Water have also completed Drainage Scheme Studies, Waterway Activity Plans, Waterway Condition Assessments and other studies which will facilitate improved stormwater management within their area of responsibility. · South East Water – Although not a specific stormwater management program, South East Water is responsible for the Southern Peninsula Shared Cost Sewerage Scheme. This program is designed to accelerate the provision sewerage services to commercial areas with commerce contributing to the cost of the scheme. During 2000 and 2001 these programs were focussed on the commercial centres in Blairgowrie, Portsea and Sorrento.
3.7 Regional Strategies, Frameworks and Legislation
Stormwater management has been recognised under a number of regional strategies, frameworks and legislation that are relevant to the development and implementation of Mornington Peninsula Shire Council’s Stormwater Management Plan. These strategies, frameworks and legislation identify environmental outcomes and management objectives that are necessary to maintain regional environmental values and the community’s expectations.
In this regard, key strategies, frameworks and legislation include: · State Environment Protection Policy (The Waters of Victoria), Schedule F6 and F8 (Draft); · Westernport Catchment Action Plan (CAP) (1999); and · The Port Philip and Western Port Regional Catchment Strategy (1997).
The relevance of each of these strategies, policies and legislation to the Mornington Peninsula Shire Council Stormwater Management Plan is discussed briefly in the following subsections.
3.7.1 State Environment Protection Policy (The Waters of Victoria)
State Environment Protection Policies (SEPP’s) have been developed for a number of regions and catchments to define specific receiving environmental objectives. They define beneficial environmental uses, quality indicators, environmental objectives and may provide a management framework for achieving the defined objectives.
The Mornington Peninsula is covered by four SEPP’s, i.e. Waters of Victoria (1988), SEPP Schedule F6 (Waters of the Port Philip Bay), Groundwaters of Victoria and Waters of Western Port Bay and Catchment (1979) . The latter document is due to be replaced by Draft SEPP Schedule F8 (Western Port and its catchment) and as such this document will refer to Schedule F8 when considering SEPP’s for Western Port. The SEPPS define requirements for nutrient management within Port Phillip including the definition of goals relating to reduction in nitrogen loads (an annual load reduction of 1000 tonnes of nitrogen). This requirement has been one of the catalysts which has lead to the production of municipal Stormwater Management Plans (ie. such as Mornington Peninsula Shire Council’s SWMP). In accordance with this, the SEPP defines a number of provisions requiring those responsible for drainage and land use planning (ie. local government) to: · Ensure new urban developments are designed, constructed and maintained according to best practices; and
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 23
· Review stormwater systems to identify opportunities for enhancement and upgrade to reduce pollutant loads to Port Philip.
3.7.2 Port Phillip and Westernport Regional Catchment Strategy
The Port Phillip and Westernport Regional Catchment Strategy has been prepared by the Port Phillip and Westernport Catchment and Land Protection Board under the Catchment and Land Protection Act (1994). The Regional Catchment Strategy provides a strategic framework for the development and implementation of initiatives to improve the condition of the regions catchments. In this regard, it guides resource allocation and defines a number of goals and objectives which encapsulate the function of the CaLP Boards and responsibility of all government agencies.
The strategy: · Provides an overview of the environmental characteristics of the region, including its water resources, biodiversity, land use characteristics and social aspects; · Describes the characteristics of the five major catchments in the region (ie. Westernport, Dandenong, Yarra, Maribyrnong and Werribee); · Defines regional issues and management priorities; and · Provides key directions and recommendations for action including the assignment of responsibilities for different management aspects.
The strategy highlights Water Quality as a key management issue and calls for the implementation of actions relating to stormwater management, achievement of SEPP objectives, establishment of partnership agreements between different management authorities and identification of pollutant sources.
This strategy establishes the regional framework under which a number of more detailed management strategies and action plans have been developed, including the Westernport Catchment Action Plan, which covers the municipality.
3.7.3 Westernport Catchment Action Plan
The Western Port CAP was developed to provide a basis for implementing the recommendations and objectives of the Regional Catchment Strategy (refer above). The CAP defines priorities for management based on a range of resource management needs that include: · Waterways management and flood protection; · Water quality protection; · Native vegetation and habitat protection; · Integrated land management; and · Pest plant and animal control.
For each of these categories the current status of natural resources and pressures are described. Pollutants from urban stormwater runoff have been defined as one of the key pressures on water quality protection within the Western Port Region. With regard to this, the CAP specifically calls for
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MORNINGTON PENINSULA SHIRE COUNCIL LOCALITY AND CHARACTERISTICS 24
the development of Stormwater Management Plans for municipalities. The need to ensure that the recommendations of the BPEM Guidelines are followed with respect to sediment control on construction sites is also highlighted.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA SUMMARY OF PREVIOUS STUDIES AND GIS INFORMATION 25
4 SUMMARY OF PREVIOUS STUDIES AND GIS INFORMATION
This Chapter provides a summary of key data and information used in the development of the Stormwater Management Plan. Data and information have been used to: · describe existing characteristics of the stormwater drainage system; · gain an understanding of current and proposed land uses; · provide background information for values assessment; and · provide an insight into the likely stormwater threats.
4.1 Prior Studies
Table 4.1 provides a summary of the background material used in the study that was not summarised in Section 3.7, which identified regional strategies and plans. Documents were obtained from a variety of sources including Mornington Peninsula Shire Council, Melbourne Water and other statutory authorities. Table 4.1 summarises the following information: · document title; · the author/origin of the document; · date of publication; and · a brief summary of the reports contents.
4.2 GIS Data
To undertake the study, GIS data was obtained from Mornington Peninsula Shire Council (MPSC), Melbourne Water (MW) and Department of Infrastructure (DOI) and incorporated into a MapInfo GIS database. The following list outlines the data obtained and its source: · Land use zones and planning overlays (DOI); · Road layouts (MW); · Municipal boundary (MW); · Drainage system information (MW); · Contour information (MPSC); · Waterways and structural stormwater management devices (MPSC and MW); and · Satellite imagery (WBM).
In addition to digital data, Mornington Peninsula Shire Council also provided information identifying the location and details of existing and proposed structural treatment devices.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA SUMMARY OF PREVIOUS STUDIES AND GIS INFORMATION 26 Table 4.1 Summary of Background Material
Date of Title Author Summary Publication MPSC 1997 This report summarises past and present management of the catchment, provides a Draft Chinamans Creek Catchment Strategy description of existing conditions, provides an assessment of the current issues and proposes as series of strategies to respond to the issues. MPSC & 1998 The report was commissioned to provide the Shire and Melbourne Water with a MW detailed assessment of flooding, drainage and waterways issues and identify where Mornington Peninsula Drainage Area Due the limits of regional drainage responsibility should lie. The report also documents Diligence Investigation the current state of the drainage network and identifies a range of measures to be implemented to respond to problems identified during the study. MW 1998 This study reports the assessments of waterway condition made on a number of Waterway Assessment in the Western Port streams draining to Western Port. The assessments included consideration of in Catchment stream and riparian habitat condition, water quality, toxicants, diatoms, macroalgae, macroinvertebrates and fish surveys. MW 1998 This report is part of an annual series published by Melbourne Water. The report Health of Waterways within the Port Phillip looks at a number of waterways across greater Melbourne and presents data & Western Port Catchments - Annual Stream describing a range of parameters including water quality, stream health and provides Health Monitoring catchment assessments. Waterways within the shire that were assessed include Watsons Creek, Warringine Creek, Merricks Creek and Main Creek. Health of Waterways within the Port Phillip MW 1999 This report is similar to the previous report although a greater range of parameters are & Western Port Catchments: Waterway reported. Report 1998 Western Port 1992 This report considers all of Western Port Bay and is a description of current water Regional quality and catchment management issues. The report also discusses the protection Western Port Bay Strategy, A Strategy Plan for the Protection and Development of Planning and of natural habitats, economics and the management responsibilities of the various Western Port Co- agencies. ordination Committee EPA 1999 This report was developed by the EPA and addresses issues related to waterway Watsons Creek Environment Improvement management, water quality protection, native vegetation and habitat protection, Strategy integrated land management and pest plant and animal control. This report was a precursor to the establishment of the Watsons Creek Catchment Action Program.
.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 27
5 STORMWATER THREATS
One of the key outcomes of the Stormwater Management Plan is the recommendation of strategies and actions to manage and minimise the impacts of current or potential threats to values of the receiving environment. This Chapter of the report discusses the approach adopted in identifying threats and the nature of the threats themselves for each of the different subcatchments within the municipality.
These threats are then considered in conjunction with the values identified in Chapter 6 to assess and prioritise risks in Chapter 7. The risk assessment is specifically concerned with the negative consequences to values posed by specific threats.
5.1 Adopted Approach for Identifying Threats
For the purposes of this study, stormwater threats are defined as activities or sources of pollution potentially resulting in adverse impacts to values of the receiving environment. Threats have been defined across the municipality in a generic context by considering: · Dominant land uses whose runoff contribute to stormwater pollution; · Specific activities which may generate stormwater pollution; · Degraded areas including land uses and waterways which may generate pollution; · Changes in hydrologic characteristics which may lead to pollution; and · Advice from the Project Working Group.
The assessment of actual and potential threats was undertaken separately for each study subcatchment (refer Figure 3.3). Generic threats were initially defined by considering issues across the entire municipality. The approach of defining generic threats, as opposed to site specific threats, was adopted due to the homogeneous nature of many of the land uses and activities across the municipality.
Threats were ultimately assigned with a score to reflect their magnitude and exposure frequency in each subcatchment. The scoring of threats is discussed in Chapter 7.
5.2 Threat Types and the Nature of Pollution
Table 5.1 summarises the range of generic stormwater threats which have been defined across the municipality, including details of the sources and types of pollutants associated with each threat and how they are generated. Table 5.2 identifies the nature of key pollutants listed in Table 5.1, including their potential impacts and time scale of impacts.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 28
Table 5.1 Generic Threat Types and Key Pollutants
Threat Cause Key Pollutants and Impacts Residential Land Use Runoff Atmospheric deposition and buildup from traffic, Increased flow, sediment, nutrients, washing cars, fertiliser application, poor waste litter, oxygen depleting material, management (domestic refuse), lawn clippings and hydrocarbons, pathogens, trace metals, vegetation. pesticides surfactants Industrial Land Use Runoff Atmospheric deposition and buildup from traffic, poor Increased flow, sediment, nutrients, waste management, accidental spills and illegal litter, oxygen depleting material, discharges. hydrocarbons, pathogens, trace metals, pesticides, surfactants Commercial Land Use Runoff Atmospheric deposition and buildup from traffic, poor Increased flow, sediment, nutrients, waste management practices. litter, oxygen depleting material, hydrocarbons, pathogens, trace metals, surfactants Major Road Runoff Atmospheric and vehicular deposition and accumulation. Sediment, litter, trace metals and hydrocarbons Unsealed Road Runoff Erosion of unsealed road surfaces Sediments Residential Development Poor sediment and erosion control, uncontrolled wash Sediments, nutrients down of equipment, deposition of sediments vehicles and spills from construction process (eg. concreting). Building Site Runoff (Lot Scale) Poor management of building site waste and materials. Sediment and litter Unstable and Degraded Poorly controlled stock and recreational access, weed Sediment, nutrients, oxygen depleting Waterways infestation, damage from waterway works, development material encroachment, vegetation loss, eroded and unstable riparian zones. Flow Modification Extraction of water for agricultural purposes. Reduced flows Landfill and Contaminated Sites Runoff or leaching from landfills and contaminated sites. Oxygen depleting material, pathogens, sediments, nutrients, litter, trace metals, hydrocarbons and toxicants Septic and Sewer Leakage Infiltration and overflow from sewerage systems. Oxygen depleting material, pathogens and nutrients. Agriculture Poor management of agricultural areas leading to Sediment, nutrients and pathogens erosion, poor use and control of pesticides and nutrients Docks and Wharves Runoff from wharf areas including atmospheric Sediment, raw product (oxygen deposition, spilt raw product, erosion from unsealed depleting materials), oils and greases, areas and accidental spills. trace metals and toxic substances Other Any other landuse within a catchment, e.g. golf courses, Dependent of threat type which may have an impact on Stormwater Quality
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 29
Table 5.2 Pollutant Impacts and Time Scales
Parameter Potential Impacts Time Scale Hydraulic Effects – Increased flow rates and velocities increase the frequency of bed disturbance Instantaneous to Increased flow Changes to substrate characteristics as a result of the removal of easily eroded materials hours Increased rates of bed erosion and nick point retreat Higher sediment transport rates Reduced opportunity for watercourse geomorphology to recover Hydraulic Effects – Reduced flushing and water turn over, increasing stagnation Weeks to months Reduced flow Suspended Solids Reduced light penetration, affecting photosynthesis rates of algae, submerged macrophytes Days to years and seagrass beds Clogging of gills of fish and invertebrates Reduced substrate habitat value, including filling of voids in gravel substrates. This affects invertebrates and some fishes, who require voids for feeding and respiration Increased deposition of inert sediments can reduce food supplies for some invertebrates Nutrients Increased algae concentrations, often favouring blue-green algae (cyano bacteria) Months to years Increased growth of aquatic macrophytes, but often reduced diversity Reduced diversity of invertebrates and fish Increased turbidity due to algal growth Lowering of dissolved oxygen levels due to algal decay Litter Physical harm to aquatic biota Weeks to years Visual impact Reduction in habitat value Oxygen Demanding Reduced dissolved oxygen concentrations Hours to weeks Materials Reduced diversity of fish and invertebrates Change in the structure of macro invertebrate communities (e.g. domination by worms) Hindered respiration of fish, possibly reaching lethal levels Increased levels of bacteria and some algae (particularly filamentous green algae) Decreased growth of most macrophytes Very low oxygen levels may increase the release rate of nutrients and metals from sediments Pathogens Bacteria and other pathogens may affect human health Less than 1 week Toxic Organics (eg. May be lethal to fish and invertebrates at high levels (rare in stormwater) and can Years Pesticides) bioaccumulate in the food chain, affecting predators Low levels may hinder reproduction by fish and invertebrates Herbicides may reduce the abundance of algae and macrophytes Toxic Trace Metals Toxic to fish, invertebrates, algae and macrophytes and can bio-accumulate in the food Years chain, particularly affecting predators Generalised toxicity ranking of metals commonly found in stormwater is (high to low) as follows: Copper, cadmium, zinc, lead, aluminium, nickel, iron, chromium Oils and surfactants High levels of hydrocarbons and surfactants are toxic to fish, invertebrates and macrophytes Hours to months Reduction in photosynthesis, affecting algae and seagrass growth Fish respiration and feeding may be hindered by hydrocarbons
5.3 Mornington Peninsula Shire Council Pollutant Sources and Threats
Key stormwater threats were identified for each of the 18 subcatchments within the municipality. The threats were attributed with qualitative ratings (ie. low, moderate, high and very high) reflecting the perceived significance of each threat in each catchment. The significance of a threat considers both the threats exposure and magnitude. Exposure refers to the potential frequency of the threat
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 30
occurring, with threats that occur frequently posing a higher threat. The magnitude of the stormwater threat refers to the area and severity of exposure with large areas (eg. land uses) and high pollutant loadings having the highest magnitude.
The following subsections provide a summary of the distribution of stormwater threats throughout the municipality. Appendix C in Volume III provides a detailed discussion of threat types in each subcatchment. The final section of this Chapter provides a summary of threats and their magnitudes throughout the Shire.
As part of Project Working Group Workshop 2, PWG members were asked to participate in assigning qualitative ratings for values and threats in five catchments. It was necessary to select five catchments, as it would be impossible, due to time constraints, to discuss all of the eighteen catchments during a workshop session. The following five catchments were selected, as they were considered to be representative of key values and threats throughout the municipality. · Watsons Creek; · Nepean; · Chinamans Creek; · Balcombe Creek; and · Mornington
The PWG was presented with the Study Team’s preliminary ratings for their consideration and discussion. A number of amendments were incorporated reflecting varying opinions on the importance of certain values and magnitude of different threats. Following the workshop a document detailing the threats and values assessment in each of the 18 subcatchments was distributed to the project steering committee for their review and comment.
5.3.1 Residential Land Use Runoff
Residential areas, medium and low-density, are the second most extensive landuse within the municipality and will ultimately occupy 17% of the Shire. It was assumed that the generation of pollution within residential areas would be uniform across the municipality. Therefore ratings for this landuse were based on the area of urban development contained within each subcatchment. Two subcatchments, Nepean and Mt Eliza, were considered to have high threats generated by residential landuse as each has a residential area in excess of 10 square kilometres. The remainder of the subcatchments draining to Port Phillip were considered to have had moderate to high threat from residential areas. Somerville (Watsons Creek), Tyabb (Olivers Creek), Hastings and Crib Point generated moderate threats that drained to Westernport.
5.3.2 Industrial Land Use Runoff
The major industrial precinct within the municipality is located in the Olivers Creek subcatchment and includes the BHP Westerport Works and Esso/BHP Petrochemical facilities. Despite their size these plants are not considered to pose a significant stormwater threat as each site has a range of stormwater management practices in place and both are licensed by the Environment Protection Authority.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 31
The other significant areas of industrial landuse are located in the Mornington catchment and in the subcatchments surrounding Hastings. There are two industrial areas in the Mornington subcatchment; located on Nepean Highway and Mornington-Tyabb Road respectively. The industrial area on Nepean Highway contains a number of small manufacturing and warehousing and distribution sites. The precinct is partially developed and is not expected to be generating significant stormwater pollution loads. The area on Mornington-Tyabb Road contains a number of industries, including a transfer station, dog pound and a number of storage yards. The combination of these two areas poses a Moderate to High magnitude threat.
Hastings has industrial areas to its north and south, which fall into three of the study subcatchments. The areas support a variety of small businesses that include mechanics, panel beaters, workshops and garden supplies. The threat is considered to be of low magnitude due to the small area occupied in each catchment.
5.3.3 Commercial Land Use Runoff
The municipality contains a number of commercial areas. The majority of the commercial areas consist of strip shopping centres with a variety of businesses, many of which are takeaway food outlets servicing the tourist industry. These commercial areas are believed to be generating significant litter loads in peak periods due to the high level of usage. Threats in each subcatchment were assigned based on the area of commercial development, its proximity to receiving environments and the impacts of seasonal trade.
The Nepean subcatchment contains commercial areas at Sorrento, Blairgowrie and Rye. These areas were listed as having a high threat due to the seasonal load and their proximity to Port Phillip.
Mornington is a major commercial area at the Northern end of the Peninsula. The precinct extends from Nepean Highway to the Esplanade along Main Street. The precinct includes a variety of shops such as supermarkets, car yards, take away food shops and restaurants. The area has high traffic and pedestrian volumes and large areas of car parking. The threat magnitude reflects the distance of much of the commercial area from the receiving environment.
A number of other catchments have commercial areas those are considered to pose moderate threats due to their size. These areas include Hastings, Rosebud, Rosebud West and Dromana.
5.3.4 Major Road Runoff
The threat from major roads includes freeways and main roads identified in the planning scheme. The low number of major roads within the municipality has reduced the magnitude of this threat across the municipality. Four subcatchments contain lengths of Point Nepean Road and the Mornington Peninsula Freeway, i.e Chinamans Creek, Balcombe Creek, Rosebud and Dromana. Both roads have high traffic volumes and do not have any devices installed to improve the quality of stormwater running from them.
5.3.5 Unsealed Road Runoff
The urban and rural areas of the Peninsula contain numerous unsealed roads, many of which are on steep slopes. In many cases the layout of the roads, i.e. running up and down the slope, is likely to
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 32
encourage erosion due to the elevated flow velocities on the road and in the roadside drains. The impact of individual roads on stormwater pollution will depend on its traffic volume, the condition of the roads surface and if the runoff drains directly to a waterway. The rating given to each catchment was selected based on the number of unsealed roads within the catchment and their condition as perceived by the Project Working Group.
Subcatchments such as Olivers Creek and Balcombe Creek contain a large number of unsealed roads within rural areas. Urban areas with high numbers of unsealed roads that are generating high threats include Mt Martha, Merricks Creek and Shoreham.
5.3.6 Residential Development
The major area of residential development within the municipality is occurring on the eastern fringes of Mornington and Mt Martha spanning the Balcombe Creek and Mt Martha subcatchments. The Balcombe Creek catchment contains the major residential development area within the municipality. It is expected that the subdivisional activity will continue for several years as approximately half of the area zoned for residential development is yet to be subdivided. Works associated with the establishment of roads and the drainage system are generating large pollutant loads (sediments and nutrients). The absence of sediment and erosion control measures is resulting in these pollutants being delivered to Balcombe Creek.
An area on the southern fringe of Hastings in the Kings Creek and Hastings Township subcatchment is also generating a high magnitude threat (Figure 5.1). The development is occurring immediately adjacent to mangroves and the riparian area of Warringine Creek. The development does not have any sediment and erosion controls in place and is likely to be having a significant impact on the foreshore and riparian areas it adjoins.
The moderate to high threat in the Mt Martha subcatchment reflects the area under development near the intersection of Forest Drive and Hearn Road in Mt Martha. There are also several areas of residential development within the Chinamans Creek catchment adjacent to Tootgarook Swamp generating Moderate threats.
Figure 5.1 Residential subdivision works in the Hastings and Kings Creek subcatchment
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 33
5.3.7 Building Site Runoff (Lot Scale)
The distribution of threats associated with Building Site Runoff reflects the distribution of subdivisional activity throughout the municipality. Current building works being undertaken in the Balcombe Creek catchment pose a high magnitude threat as they are generating high litter and sediment loads, due to inadequate site management. Most sites have waste bins on-site and these are having a significant impact on controlling building waste where they are utilised (Figure 5.2). Sites where bins are not used or are overflowing are often having litter blown off the site.
Figure 5.2 An example of a bin used for building site waste management
Many sites are contributing to sediment export due to a lack of sediment and erosion control measures and poor site management (Figure 5.3). Few sites were observed to have any sediment and erosion control measures in place and most are completely cleared allowing sediments to be mobilised and exported from the site. Access on and off sites is often uncontrolled resulting in sediment loads being deposited on the road surface.
Figure 5.3 An example of poor Building site sediment and erosion control
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 34
Building Site Runoff is a threat in a number of other areas where new subdivisions are being established or in-fill activity is occurring. Subcatchments within the municipality where this is occurring include Kings Creek and Hastings, Mt Martha, Chinamans Creek and Mornington. The lower magnitude threats in these subcatchments reflect the reduced area over which development occurs
5.3.8 Unstable and Degraded Waterways
Waterway degradation is widespread throughout the municipality. The extent and degree of degradation of waterways was documented as part of the Due Diligence Study. The degradation is due to a variety of factors including; · Removal of riparian vegetation; · Agricultural practices, such as stock access resulting in removal of vegetative cover and disturbance of the banks; · Earthworks to re-align or increase channel capacity. · Geological formations which are highly erosive; and · Altered hydrologic regimes as a result of urbanisation
Catchments with significant waterway degradation include the escarpment catchments of Mt Martha, Mornington and Mt Eliza. In these catchments waterway degradation is due to the impacts of urbanisation and highly erosive geological formations in the area.
Other areas of the municipality, which have significant waterway degradation problems, are often due to agricultural activities and the removal of riparian vegetation. These subcatchments include Merricks, Shoreham and Watsons Creek. In many cases the waterway degradation is linked to land management and agricultural practices.
5.3.9 Flow Modification
In a number of catchments a large number of water storages have been constructed for agricultural purposes. It is has been identified within the Due Diligence Study (Condina and Craigie, 1999) that in some catchments these storages may be having an impact on summer low flows. The impact of the altered flow regimes on the in-stream environment has not been quantified and it has therefore been listed as posing a moderate threat.
5.3.10 Landfill and Contaminated Sites
The municipality contains several former landfill sites. Several sites on the Nepean Peninsula and within Balcombe Creek subcatchment were identified where it was believed by the Project Working Group that leachate posed a moderate threat to stormwater.
5.3.11 Septic and Sewer Leakage
Many areas of the municipality rely on septic tank systems to treat household and commercial sewage. A percentage of the septic tank systems were installed with either inadequate capacity or in inappropriate soils. In addition many of the systems are old and have not been adequately
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 35
maintained. The failure of septic systems has resulted in the pollution of the surface waters and groundwater aquifers with pathogens and nutrients.
The threat generated from septic systems is widely distributed throughout the municipality, with the most significant threats found on the Nepean Peninsula and within townships on the southern side of the municipality. Within the Nepean and Chinamans Creek catchments effluent disposal from septic systems has polluted the groundwater with elevated levels of nutrients and pathogens found in the aquifer.
Many of the small townships along the southern edge of the municipality, e.g. Flinders, Merricks Beach and Shoreham, are not sewered and rely on septic systems. Many of the properties are holiday homes and the resulting highly variable seasonal loading and poor maintenance results in some systems failing. Failure of the septic systems results in the release of sewage to surface waters.
A number of areas throughout the municipality posed lesser threats from septic systems, in most cases the threat was derived in catchments where reticulated sewers are available but properties are not connected (e.g. Tyabb, Rosebud and Dromana). These properties rely on septic systems, which are often old, too small and are not maintained adequately resulting in the leakage of waste to ground and surface waters.
5.3.12 Agriculture
Whilst the current study is an Urban Stormwater Management Plan, agricultural areas have been considered as they are present in almost all subcatchments and are responsible for a number of environmental impacts.
Agriculture is the dominant landuse within the municipality, occupying over 60% of the municipality. There are a range of uses including intensive agriculture, grazing, orchards, poultry production and viticulture.
Intensive agriculture areas in the Watsons Creek and Chinamans Creek catchments pose a significant threat, and are known to be contributing high nutrient loads to surface and groundwater. The high productivity of the market gardens (Figure 5.4) requires frequent applications of fertilizer and regular irrigation. Farming practices result in large areas of bare soil which is either washed off with runoff or is conveyed to the road network by farm machinery enters the stormwater system following rainfall events (Figure 5.5).
The other agricultural landuses within the municipality also impact on riparian areas through stock access to waterways and works to re-align or improve the drainage characteristics of waterways. Therefore many waterways within agricultural areas are degraded and considered to pose a threat and are discussed in Section 5.3.8.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 36
Figure 5.4 Market garden in the Watsons Creek subcatchment
Figure 5.5 An example of fertilizer storage in market gardens in the Watsons Creek subcatchment
5.3.13 Docks and Wharves
A port facility is located at Hastings and includes roll on roll off and petrochemical handling facilities. The area of the port is very small and the threat to the stormwater system is considered to be low as all facilities are located on the foreshore.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 37
5.3.14 Other
This category covers a number of potential threats, including golf courses. The municipality contains a number of golf courses, with the Nepean and Chinamans Creek catchment containing several courses. The golf courses in this catchment are considered to pose a moderate threat to stormwater, due to the geology, as there is a risk that nutrients will be carried by excess water and nutrients to the groundwater table due to maintenance practices that often require high inputs of fertilizer and water.
5.4 Summary of Stormwater Threats
Table 5.3 provides a summary of the threat score in all subcatchments throughout the municipality. These threat scores along with the values in Chapter 6 will be used in the Risk Assessment in Chapter 7 to identify key Stormwater Risks.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER THREATS 38 Watsons Creek Olivers Creek Kings Creek and Hastings Township Warringine Creek Crib Point Merricks Creek Shoreham Flinders Cape Schanck Nepean Chinamans Creek Rosebud Dromana Safety Beach Mt Martha Balcombe Creek Mornington Mt Eliza
Residential Land Use Runoff Mod Mod Mod Low Mod Low Low Low High Mod Mod Mod Low Mod M - H M - H High
Commercial Land Use Runoff Low Low Mod Low Low Low High Mod Mod Mod Low M - H Low
Industrial Land Use Runoff Low Low Mod Mod Mod Low Low M - H
Major Road Runoff Low Low Low Low Low Mod Mod Mod Low Mod Low Low
Unsealed Road Runoff Mod High High Mod Mod High High Mod Mod Mod Low Low High High Low
Residential Development Low Low High Low Mod Low M - H High
Building Site Runoff (Lot Scale) Low Low Mod Low Mod M- H High Mod
Very Unstable and Degraded Waterways High High Mod Mod Low High High Mod Mod High High Low Low High High High High
Flow Modification Mod Mod Mod Low Mod Mod Low Low Mod
Mod Mod Mod Landfill and Contaminated Sites H - Very High - Mod Mod Low Low Mod High High Low Mod Mod Low Low Septic and Sewer Leakage VH High VHigh Very Very Agriculture Low Mod Low Low Mod Low Mod Low Low Low Mod Mod Mod Low High High
Low Docks and Wharves
Other (Golf Course) Low Mod Mod Low
Table 5.3 Summary of Stormwater Threats within Mornington Peninsula Shire Council
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 39
6 VALUES IN RECEIVING ENVIRONMENTS
Values defined within the receiving environment reflect the communities expectations regarding their utilisation and interaction with the environment. These values play an important role in the development of the Stormwater Management Plan as they define the objectives of the management plan. As mentioned previously, the overall objective of the plan is the protection of values within the receiving environment threatened by stormwater. This Chapter summarises receiving environment values within each subcatchment.
6.1 Adopted Approach For Identifying Values
Values have been identified in the receiving waterways and riparian environments of each subcatchment to assist in identifying priorities to address the threats that either currently or potentially threaten these values. Values have been identified and rated in accordance with their significance in each study subcatchment based on: · Review of information supplied to the Study Team; · The Project Working Group Workshops undertaken during this project; and · Site visits.
In each subcatchment each value has been assigned a qualitative rating of Very High, High, Moderate or Low.
Within each subcatchment detailed assessments of the reach in general, including key locations, were undertaken to characterise values in relation to: · Environment (In-stream Habitat, Riparian Flora and Habitat, Geomorphology and Groundwater); · Cultural Heritage (European and Indigenous); · Amenity (Recreation and Visual and Landscape); · Stormwater (Flood Conveyance and Water Quality Treatment); · Economic (Property Value, Irrigation Supply); and · Receiving Environment (Local (Estuarine) and Regional).
A description of the receiving value types is contained Table 6.1.
Appendix C in Volume III provides a detailed assessment of the values in each subcatchment. The following subsections provide a summary of the key values for each subcatchment. Regional Receiving Environmental Values reflect the receiving environmental values of Western Port, Bass Strait and Port Phillip. As several catchments drain to each of these receiving environments they are discussed separately in the following subcatchment sections. The final section of this Chapter provides a summary of all receiving environmental values considered in the municipality.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 40
Table 6.1 Receiving Value Types Value Category Specific Value Types Description Environmental In-stream Habitat In-stream ecological values based on water quality, habitat quality and diversity, flora and fauna species, extent of invasion by exotic species and general in -stream condition and stability. Riparian Habitat/Flora Waterway condition and ecological values based on extent and quality of remnant (native) vegetation, weed infestation and stability of riparian zone. Geomorphology Significance of the natural geomophological character of the waterway reflecting historical development of the watercourse and important bed and bank features. Groundwater Beneficial uses of the groundwater resource in accordance with the segments defined in the State Environment Protection Policy (Waters of Victoria). Amenity Recreational Amenity Public access and utilisation for passive and active recreation including shared trails, formal linkages, utilisation for activities involving primary and secondary contact, extent of open space, facilities such as car parks and picnic areas, continuity of open space and visual attractiveness. Visual/Landscape Amenity Aesthetic appreciation of the natural and built environment including consideration of natural and man made structures, landscapes and places of importance, visual access and relationships to adjacent facilities. Cultural European Cultural Heritage Places and sites of European Heritage value, possibly including sites of pioneering significance, historical buildings and infrastructure, trails and transport routes. Indigenous Cultural Heritage Places and sites of Indigenous Heritage value such as artefact scatters, landscape and places of significance (eg. relating to story telling), ceremonial sites (eg. Bora Rings), camp sites and trails. Stormwater Flood and Conveyance Contribution to protection against flooding including consideration of waterway capacity, designated floodways and flood protection infrastructure (eg. levees) Water Quality Treatment Contribution to water quality management (incl. Stormwater). This may include existing wetlands or other infrastructure that has been developed to improve water quality. Economic Property Property value associated with proximity to water. This may include values associated with visual amenity, access and amenity. Navigation Economic benefits derived from the watercourse due to navigability of transport or recreational hire vessels. Receiving Local (Estuarine) Significance of the local receiving environment immediately Environment downstream of the subcatchment under consideration. The significance will reflect the combination of values described above for the downstream environment. Regional Significance of the regional environment into which stormwater ultimately discharges.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 41
6.2 Summary of Receiving Environmental Values within Mornington Peninsula Shire Council
6.2.1 Watsons Creek
The highest values in this subcatchment are associated with the Local Receiving Environmental Values. The Local Receiving Environment is of regional and national botanical significance, as it contains a large area of mudflats and mangroves along the shores of Western Port and Quail Island (AWT Pty Ltd, 1998).
Within the subcatchment values across the range of Environmental value types are generally poor as a result of historical and ongoing modifications to the drainage system and landuse practices. The modifications include the loss of aquatic habitats from the excavation and clearing of channels to maintain hydraulic capacity and realign channels. Water quality was rated as poor during 1997 (Melbourne Water, 1998) and very poor during 1998 (Melbourne Water, 1999), in both years it was characterised by low water clarity and elevated nutrient levels.
The groundwater resource in this subcatchment has a high value as it is considered to be of potable quality in the Groundwaters of Victoria SEPP (EPA, 1998).
The Amenity values are low to moderate due to the modifications to the waterways, lack of public access as much of the creek system is contained in private holdings and the minimal areas of public open space adjacent to the waterway.
6.2.2 Olivers Creek
Olivers Creek has been modified over time as a result of agricultural activities and drainage works. These works have realigned streams and removed much of the riparian vegetation. Given the level of disturbance that has occurred in the streamlines throughout the catchment the in-stream, riparian and geomorphological values were considered to be Low. The groundwaters have a Moderate value reflecting their beneficial uses under the Groundwaters of Victoria SEPP (EPA, 1998).
Recreational values are moderate due to the variation of recreational opportunities throughout the catchment. Recreational opportunities exist in lower sections of the catchment where Olivers Creek enters Watsons Inlet. The upper catchment is in private ownership and has minimal open space recreational opportunities.
Flood Conveyance in this subcatchment has a High value as areas within Tyabb regularly flood and recent works have been undertaken to minimise the flood risk. Outside of Tyabb, Olivers Creek passes through a predominantly rural catchment and the potential impact of flooding is significantly reduced.
Olivers Creek and McKirdys Drain flow into Local Receiving Environments with Very High environmental values. At the downstream end of waterway is an area of remnant melaleuca swamp, salt marsh and mangrove areas, which is one of the few remaining examples of this type of landscape in southern Australia. The coastline near the outfall of McKirdys Drain is also identified as being of state and regional significance for its flora and bird habitat.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 42
6.2.3 Kings Creek and Hastings Township
As is typical of many of the catchments draining to Western Port, the waterways have been significantly altered by agricultural activities in the upper parts of the catchment. Works have been undertaken on streams to clear vegetation, realign streams and construct farm dams. In the catchment’s lower reaches (downstream of Boes Road) the creek contains more of its original characteristics as the stream has been less disturbed and maintains some of its riparian vegetation, although it is degraded by litter from the adjacent residential areas and weeds such as blackberry. The environmental values are therefore rated as Moderate to Low for the range of parameters.
Upper catchment areas afford minimal recreational opportunities with creek systems located in private realm. Lower catchment zones have numerous recreational opportunities at Hastings Foreshore Reserve.
The Economic value of the surface waters is rated as High as it is used to supply water to the market gardens.
The Local Receiving Environment has a High value and is similar to the other reaches draining to the Northern Arm of Western Port, with remnant areas of melaleuca swamp, salt marsh and mangrove. The lower magnitude rating in comparison to adjacent subcatchments is due to areas of the foreshore have been degraded by filling and the construction of marinas.
6.2.4 Warringine Creek
The Environmental values vary considerably over the length of Warringine Creek. The lower sections of this reach (downstream of Hendersons Road) are in good condition with much of the instream and riparian habitat intact. Upstream of Hendersons Road the condition of the waterway varies with some sections of channel modified by agricultural practices and to maintain its hydraulic capacity. In other areas riparian vegetation has been re-established and has improved its Environmental values. There is evidence of bed aggradation and degradation throughout the catchment and this is likely to reduce the habitat values. The In-stream, Riparian and Geomorphological values adopted are an average value reflecting the variation values throughout the subcatchment.
The Amenity values is this reach are high due to the numerous recreation opportunities that exist within Warringine Heritage Park in the lower reaches of the subcatchment. The upper catchment is located within private landholdings and the stream system affords minimal recreation opportunities. The Landscape Amenity is associated with the landscape features at the downstream end of the catchment. Along the Western Port foreshore high quality views are available of the riparian vegetation and of Western Port.
The Local Receiving Environment at the downstream end of Warringine Creek is an area of remnant melaleuca swamp, salt marsh and mangrove areas forming part of the Bittern Coastal Wetlands. The Bittern Coastal Wetland Area is an important habitat for over 200 bird species. The area also contains a number of significant plant communities, with one of high regional significance (grassy woodland) and several examples of high local significance. The tidal flats at the mouth of Warringine Creek are of State significance geologically and geomorphologically.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 43
6.2.5 Crib Point
HMAS Cerberus Naval Base dominates the subcatchment, the base has extensive intact land cover with a range of habitats representing a High value landscape and visual resource on a prominent Western Port site. The remainder of the catchment has been extensively cleared with minimal topographical relief and low to moderate landscape quality.
The creeks draining to Hanns Inlet contain relatively intact melaleuca swamps and have High Environmental values. The Local Receiving Environment for this reach is an extension of the Hastings Township and Kings Creek reach and is expected to be of Very High value.
6.2.6 Merricks Creek
The environmental values throughout the Merricks Creek catchment vary significantly. In the upper reaches much of the riparian vegetation has been removed or has been damaged by overgrazing. These conditions have led to bed and bank erosion at many sites throughout the catchment. The areas of remnant vegetation are often degraded by weeds. The lower reaches of the subcatchment contain the Coolart Wetlands, which are part of a large wildlife sanctuary and have high in-stream, geomorphological and riparian values.
The waterways have High Indigenous Heritage values as several sites of indigenous heritage have been identified adjacent to the waterway. Details regarding the sites were not available and it is suggested that further investigations be undertaken prior to undertaking works along the waterway.
The Recreational Amenity values are High due to the recreational opportunities provided by the foreshore and estuary adjacent to the Coolart Wetlands.
The Local Receiving Environment is of Very High value due to its Environmental and Amenity values. The estuary is identified as having regional geomorphological significance as it has a multiple bar system at its outlet. The recreational and visual amenity offered by the estuary and adjacent foreshore contributes significantly to the character of Balnarring Beach.
6.2.7 Shoreham
The waterway values vary across the catchment depending on the degree of clearing that has occurred adjacent to the waterway. Where the remnant melaleuca swamps have been retained the environmental values are higher as the waterways appear to be more stable. Where riparian areas are cleared and particularly where stock have access, environmental values are significantly reduced, with frequent occurrences of erosion heads.
The construction of numerous farm dams in the upper part of the catchment was identified by (Pat Condina and Neil Craigie, 1998) as being likely to significantly impact the in-stream environment, as summer flows would be significantly reduced.
Amenity values are High reflecting the extensive recreational opportunities along Western Port and rolling terrain that provides a range of landscape settings.
The Local Receiving environmental values are High reflecting the high recreational and visual amenity provided by the foreshore at Shoreham and Point Leo. Both areas are the focus of
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 44
recreational activities throughout the year and particularly in summer, when the foreshore camping grounds are utilised.
6.2.8 Flinders
The environmental values within this subcatchment are Moderate to Low across the range of categories reflecting the disturbance that has occurred in the subcatchment. The upper reaches of the subcatchment has been significantly disturbed by land clearing activities and stream works such as re- alignment. Where regeneration has occurred, the environmental values of the streams have improved. The lower reaches of the waterways in the township area are significantly impacted upon by the invasion of weeds into the riparian areas.
The catchment has Low Recreational Amenity as it contains limited recreational areas and linkages except to the Western Port foreshore.
The Local Receiving Environment values are high reflecting the high recreational and visual amenity provided by the foreshore area. The foreshore area is the focus of recreational activities such as swimming and walking. The cliffs along the coastline add to the visual amenity as do the views over open water.
6.2.9 Cape Schanck
The major values within this catchment are associated with the Recreational Amenity (Very High) and Visual and Landscape Amenity (High). Extensive passive recreation opportunities exist, these include the Two Bay walking track, Mornington Peninsula National Park and a number of beaches. The topography of the area provides a diversity of landscape settings, including upland areas and cliff edges. Large areas of intact vegetation contrast with extensive areas of modified land cover. The catchment also contains several high value indigenous heritage sites that have been identified along waterways.
6.2.10 Nepean
As this catchment does not contain surface drainage lines the environmental values of this catchment were assessed differently to other catchments. Environmental values have been assessed for the groundwater aquifer and the areas of open water within the catchment.
The catchment contains several water bodies. These water bodies are surface expressions of the groundwater table and have relatively small catchments. The systems, based on limited observations and available data, appear to have healthy ecosystems and provide habitat for a range of avifauna. The Riparian Habitat values (High) are indicative of the areas that fringe the open water bodies.
The geomorphology of the area is of high value as the dunal topography is unique on the Peninsula. The groundwater resource in this catchment is considered to be of potable quality and is considered to have a High to Very High value.
This subcatchment contains continuous linear park systems along Bass Strait and the Port Phillip foreshore. These areas provide a high quality recreational experience and provide High Recreational Amenity value. The Landscape and Visual amenity is also high due to the remnant vegetation and
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 45
rolling to gentle topography. In several places residential subdivisions overlook lagoons in the dune system. It would be expected that the views and amenity offered by the lagoon add significantly to the value of adjacent properties.
The Local Receiving Environment values are High reflecting the high recreational and visual amenity provided by the foreshore areas within Port Phillip and along the Bass Strait coast. Both areas are the focus of recreational activities throughout the year and particularly in summer. The Local Receiving Environment is a key factor in the economy of the local area as it attracts tourists to the area. Parts of the Local Receiving Environment form the Harold Holt Marine Reserve and the Bass Strait coastline are part of the Mornington Peninsula National Park.
6.2.11 Chinamans Creek
The waterways and habitats within this catchment are significantly modified from a range of human activities. In places the creek has been re-aligned, cleared or is encroached upon by residential and golf course developments. These impacts have resulted in the loss of riparian vegetation, erosion of the waterways bed and banks and silting of the waterways. The resultant damage has significantly reduced the values for all the environmental parameters. The groundwater resource in this catchment is part of the aquifer in the Nepean subcatchment and is of High value.
The High Recreational Amenity values are due to the extensive recreational opportunities that exist adjacent to Port Phillip within the foreshore fringe. The waterways lack significant riparian areas and do not act as linkages to the upper reaches of the catchment. The catchment contains numerous golf courses in the lowland areas.
Flood conveyance in this subcatchment has a High value as the lower reaches of the catchment including the Tootgarook Wetlands are extremely flood prone. Measures have been undertaken to upgrade the drainage capacity of culverts and open channel systems and construct retarding basins upstream of the urban areas. The Tootgarook Wetland is expected to have a significant impact of the quality of runoff entering it. The large wetland area would be expected to significantly reduce sediment and nutrient loads from stormwater.
The Local Receiving Environment value reflects Recreational and Visual Amenities offered by the foreshore. The foreshore is the focus for recreational activities, particularly during summer when the foreshore is used for camping.
6.2.12 Rosebud
The environmental values of this reach vary considerably throughout the catchment. In the urban areas the waterways have been disturbed from drainage activities with some reaches realigned and others piped. The environmental values in the upper reaches, particularly in the State Park, are high with much of the riparian vegetation retained. The Moderate values for the Environmental Values reflect the variation in waterway health throughout the subcatchment.
The areas of open space in this catchment include Arthurs Seat State Park. These areas provide High Recreational amenity values as many of the waterways have open space adjacent to them and the steep waterways draining off Arthurs Seat offer Very High Visual and Landscape value.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 46
The Local Receiving Environment value reflects Recreational and Visual Amenity offered by the foreshore. The foreshore is the focus much of the recreational activity, particularly during summer when the foreshore is used for camping.
6.2.13 Dromana
The waterway environment has been significantly degraded due to channel works, land clearing and the infestation of weeds. As a result the rating of the environmental values in this reach are considered to be Moderate across the range of categories.
This catchment drains the northern side of Arthurs Seat, where the open space network in the upper reaches of the subcatchment offers numerous recreational opportunities. Arthurs Seat also provides a green backdrop created by intact upper catchment. These features contribute to High Landscape and Recreational Amenity values within the subcatchment.
The Local Receiving Environment value reflects Recreational and Visual Amenity offered by the foreshore. The foreshore is the focus much of the recreational activity, particularly during summer when the foreshore is used for camping.
6.2.14 Safety Beach
The Environmental values in this subcatchment are Low to Moderate as the watercourses within this catchment are significantly degraded. The lack of protection of riparian areas within the agricultural areas has resulted in a significant loss of in-stream and riparian habitats.
Limited recreational opportunities exist, with poor linkage to upland areas of catchment. The Dromana Bay edge is a highly modified landscape with residential areas contrasting with large regions of intact zones in the upper catchment. Watercourses have highly modified land cover and have Moderate Visual Amenity
The Local Receiving Environment of this catchment is Dromana Bay and is considered to have High value. The foreshore is a focal point for active and passive recreation, supporting a sailing club and Boat Ramp. Dromana Bay supports an aquaculture industry that grows mussels.
6.2.15 Mt Martha
Limited data is available to quantify the environmental conditions of the Mt Martha watercourses. The High In-Stream Habitat rating is based on the observations of water quality and habitat throughout the subcatchment. The riparian areas are degraded due to erosion and the invasion of weeds such as pittosporum and are considered to have Moderate value.
Indigenous Heritage values are High as several sites of archaeological significance have been identified at the downstream end of the waterways and along the coast.
Variable topography and extensive intact vegetation combine to create a distinctive and memorable range of landscape settings of High Visual Amenity. The watercourses and their relationship to the residential development contribute strongly to local sense of place.
The Local Receiving Environment of this catchment is Dromana Bay, which has a High value.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 47
6.2.16 Balcombe Creek
Throughout the Balcombe Creek catchment the environmental condition of waterways varies significantly. Some areas, such as the lower reaches and estuary are in good condition. In 1997 Balcombe Creek was found to have a good fish communities, fair water quality and fair aquatic macro invertebrate community (Melbourne Water, 1998). In 1998 the same reach was classified as having very good water quality and aquatic macro invertebrate community (Melbourne Water, 1999). In the upper reaches of the catchment the condition of the waterway environment decreases (Melbourne Water, 1999; Melbourne Water, 1998). The decline in environmental values is associated with losses of habitat as a result of activities such as clearing adjacent to waterways and re- alignment of streamlines. The Instream and Riparian Environmental values have been defined as Moderate reflecting the variation within catchment. The High Geomorphologic value reflects the values associated with the remnant wetlands in the creeks lower reaches and the trellised pattern of the watercourses.
The European Heritage value is High and is associated with the Briars Historic Park. The remnant vegetation and creek are a key component of the Briars site and any reduction in these assets would impact on the value of the park.
The Recreational Amenity values are High reflecting the diverse recreational opportunities with linear like systems exist, including Balcombe Creek and major open spaces areas such as Devil Bend Reservoir. Upland mid slope and lowland areas combine with extensive rolling terrain and rural landuses to create a range of macro scale, moderate quality landscape settings.
Parts of the drainage system within this subcatchment near Baxter have High Flood Conveyance value.
The Local Receiving Environment of this catchment is the Balcombe Creek estuary. The estuary has a Very High value due to:
· the high value of its aquatic and riparian habitats and geomorphology, which are of local and regional significance,
· the visual and landscape amenity the estuary provides and its proximity to the Mt Martha township; and
· The recreational opportunities that exist along the banks of the creek in the areas of remnant vegetation.
6.2.17 Mornington
The waterways within this catchment are significantly degraded and have Moderate Environmental Values due to both natural processes and impacts associated with urbanisation. The Baxter Sandstone Formation, which is highly erodible, dominates the geology of Mount Eliza and most of the creeks have evidence of bed and side slope erosion. Changes to the hydrologic regime following urbanisation have increased the rate of erosion and have significantly impacted on the instream habitats and geomorphology of the streams. The riparian areas have been similarly impacted with
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 48
urban development encroaching on the waterways and much of the riparian areas dominated by weeds.
Tanti Creek has been identified as providing a High Flood Conveyance value to adjacent properties. Works have been undertaken near Nepean Highway to maintain the capacity of the channel by removing vegetation along the banks.
The Local Receiving Environment (High) value considers both environmental and recreational values associated with the beaches in this catchment. The beaches are the focus of active and passive recreational activities throughout the year and particularly in summer.
6.2.18 Mt Eliza
The Environmental values for Mornington have been adopted for this catchment.
The waterways in this catchment run through the urban areas and the open space and remnant vegetation offers High Visual Amenity.
The Local Receiving Environment includes Canadian Bay and Daveys Bay and has a High Value. The coastal area supports a number of boat clubs and would be a focus for passive and active recreational activities, particularly in summer months.
6.2.19 Regional Receiving Environments
Western Port
Western Port is the Regional Receiving Environment, its aquatic and terrestrial habitats are listed under the RAMSAR convention. Western Port also has important recreation and visual amenity values. Western Port is used for recreational boating, fishing and sight seeing, attracting visitors from throughout the region.
Bass Strait
Bass Strait has high values in a number of categories. The foreshore is an important marine environment and is part of the Mornington Peninsula National Park. The facilities and natural environment of the National Park include a number of walking trails public access beaches and Surf Lifesaving Clubs contribute to a Very high recreational and visual amenity value. Bass Strait also has important economic values, as it is a regional attraction that attracts many people from outside the municipality to the area.
Port Phillip
The large areas of open water contribute significantly to the visual amenity values. Port Phillip is a large relatively sheltered body of water and provides an important recreational destination for fishing, sailing and diving activities.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 49
6.3 Summary of Receiving Environment Values
Table 6.2 provides a summary of the Receiving Environmental Values in all subcatchments throughout the municipality. These scores along with the threats in Chapter 5 will be used in the Risk Assessment to identify key Stormwater Risk Issues.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA VALUES IN RECEIVING ENVIRONMENTS 50 Watsons Creek Olivers Creek Kings Creek and Hastings Township Warringine Creek Crib Point Merricks Creek Shoreham Flinders Cape Schanck Nepean Chinamans Creek Rosebud Dromana Safety Beach Mt Martha Balcombe Creek Mornington Mt Eliza
In-Stream Habitat Low Low Low Mod High High High Mod Mod High Mod Mod Mod Low High Mod Mod Mod
Riparian Habitat Low Low Mod Mod High Mod Mod Low Low High Mod Mod Mod Low Mod Mod Mod Mod Environmental Geomorphology Low Low Low Low High Mod Mod Mod Mod High Low Mod Mod Mod Mod Mod Mod Mod
Groundwater High Mod Mod Mod High Mod Low Mod Mod H-VH High Mod Mod Mod Mod Mod Mod Mod
European Heritage Low Mod Cultural Heritage Indigenous Heritage Low Mod High High High Mod Mod
Very Recreation Low Mod Mod High Low High High Low High High High High Low Mod High Low Low High Amenity Very Very Visual and Landscape Mod Mod Mod High High High High Mod High High Low Mod High High High High High High
Flood Conveyance Low High Mod Mod Low Low Low Low High Low Mod Mod High High Low Stormwater Water Quality Treatment Low Low High Low Mod
Property Value Low Low Mod Mod Low Mod Low Low Mod Mod Low Low Low High Low Mod Mod Economic Irrigation Supply Mod Low High Mod Mod Mod Low Low Mod Low
Very Very Very Very Very Very Receiving High High High High High High High High High High High High Local (Estuarine) High High High High High High Environmental Very Very Very Very Very Very Values High High High High High High High High High High High High Regional High High High High High High Table 6.2 Summary of Stormwater Environmental Values within Mornington Peninsula Shire Council
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK ASSESSMENT 51
7 STORMWATER RISK ASSESSMENT
This Chapter discusses the Risk Assessment undertaken to prioritise and target management strategies. Risk Assessment characterises the nature of impacts by considering threats and consequences. With respect to the stormwater management planning process the “threat” relates to activities that pollute stormwater or change its natural characteristics (eg. increased flow rates). The “consequence” refers to values and the nature of impacts to these values generated by the threat.
7.1 General Approach to Risk Assessment
The approach adopted for prioritising stormwater management activities is based on risk assessment using adopted values, threats and a term that reflects the sensitivity of the value to stormwater threats. The three factors are individually scored and multiplied to determine a single numerical value representing the magnitude of risk.
Figure 7.1 provides a schematic representation of the Risk Assessment approach applied as part of this study. For the Mornington Peninsula, risk assessment was undertaken individually for each of the 18 sub-catchments. The following subsections discuss the derivation of scores for values and threats and the calculation of risks.
Threat Value from stormwater pollution or of receiving environment: flows: - sensitivity; and - scale or severity - significance - likelihood or frequency
Threat x Value x Sensitivity
RISK of losing environmental/amenity value
Figure 7.1 Adopted Process For Risk Assessment
7.2 Scoring of Threats and Values
The threats and environmental values identified in Chapter 5 and 6 respectively were initially attributed with qualitative ratings (ie. Low, Moderate, High and Very High) reflecting their perceived significance in each subcatchment. The significance of threats considers both the threats exposure and magnitude. Receiving environment values were also rated in accordance with their significance. In order to undertake the risk assessment these qualitative ratings were replaced with numerical
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK ASSESSMENT 52
values from 4 to 1 to allow risk magnitudes to be determined. Table 7.1 summarises the range of qualitative ratings and their corresponding quantitative scores. Table 7.1 Score System for Threats, Values and Sensitivity Score Threats Value Sensitivity 1 Low Low Low 2 Medium Medium Medium 3 High High High 4 Very High Very High Very High
7.3 Sensitivity
A sensitivity factor from low to very high (ie. 1 to 4), was also included to reflect the likely impact that a given stormwater threat would have on a particular value type. The intention of the sensitivity term is to reduce the potential skewing of the risk analysis by risk scores generated from high ranked threats and values that in reality have minimal impact on each other.
Values will be sensitive to stormwater threats that produce pollutants that directly impact on that specific value. For example, values assigned to Visual Amenity will have a high sensitivity to pollutant sources such as Building Site Runoff, which produces a high litter load, and a lower sensitivity to a threat such as Major Road Runoff, which is unlikely to generate high litter loads.
Sensitivity is also used to make accommodations for the scales at which threats and values are assessed and avoids generating risks that are not representative of the spatial relationships at the macro and micro scale. At the macro scale, it is not uncommon for threats or values to have no interaction due to their spatial relationship, i.e. the threat in a given subcatchment may be located downstream or on a different watercourse to the value. At the micro scale, values may be contained within the riparian zone and are therefore largely or completely isolated from the threats contained in the waterway.
Risks were calculated in 18 subcatchments, for 14 value types and 14 threat types. This is equivalent to over 3,500 individual risk scores, each of which requires a sensitivity score. In each case the threat and the value were considered in the context of the catchment to arrive at a sensitivity score that reflects their relative interaction.
7.4 Risk Evaluation
To prioritise management strategies it is necessary to quantify the risk that threats pose to each value and rank them relatively with the other risks. This process is undertaken in each sub-catchment by multiplying the value, threat and sensitivity scores. To simplify the representation of this process a risk matrix used is to clearly outline threats, values and sensitivities in a given subcatchment.
The three sets of numbers are multiplied, with the risk score in any cell equivalent to the value score (row) multiplied by the threat score (column) by the sensitivity (upper left cell). For example, Residential Development has a threat score of 3 (high), Recreational Amenity has a value of 3 (high) and the sensitivity of Recreational Amenity to runoff from areas of Residential Development is low (2). These values combine to give a risk of 18.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK ASSESSMENT 53
The results of risk evaluation undertaken for all subcatchments in the municipality are provided in Appendix D in Volume III, which plots the risk matrix for each subcatchment. Table 7.2 provides an example of the risk analysis undertaken for the Balcombe Creek subcatchment. The threats are listed along the top of the table, the values are listed along the left-hand side of the table and the sensitivity is in the upper right-hand corner of each risk cell.
Balcombe Creek Residential Land Use Runoff Commercial Land Use Runoff Industrial Land Use Runoff Major Road Runoff Unsealed Road Runoff Residential Development Building Site Runoff (Lot Scale) Unstable and Degraded Waterways Flow Modification Landfill and Contaminated Sites Septic and Sewer Leakage Agriculture Docks and Wharves Other (Golf Course) 2.5 1.0 1.0 2.0 3.0 3.0 3.0 3.0 2.0 2.0 1.0 2.0 1.0
3 3 4.0 3.0 3.0 4.0 2.0 3.0 3.0 2.0 2.0 3.0 2.0 2.0 In-Stream Habitat 2.0 15.0 6.0 8.0 12.0 18.0 24.0 12.0 18.0 12.0 8.0 4.0 12.0 4.0
2.0 3.0 3.0 2.0 2.0 3.0 2.0 3.0 4.0 1.0 1.0 3.0 1.0 2.0 Riparian Habitat 2.0 10.0 6.0 6.0 8.0 12.0 18.0 12.0 18.0 16.0 4.0 2.0 12.0 4.0
2.0 3.0 2.0 2.0 2.0 2.0 2.0 4.0 4.0 1.0 1.0 3.0 1.0 2.0 Geomorphology 2.0 Environmental 10.0 6.0 4.0 8.0 12.0 12.0 12.0 24.0 16.0 4.0 2.0 12.0 4.0
2.0 2.0 3.0 2.0 1.0 1.0 1.0 1.0 1.0 4.0 4.0 3.0 1.0 3.0 Groundwater 2.0 10.0 4.0 6.0 8.0 6.0 6.0 6.0 6.0 4.0 16.0 8.0 12.0 6.0
3.0 3.0 3.0 2.0 2.0 2.0 2.0 1.0 3.0 1.0 1.0 2.0 1.0 1.0 European Heritage
3.0 4.0 3.0 1.0 2.0 2.0 2.0 4.0 4.0 2.0 2.0 4.0 1.0 2.0 Cultural Indigenous Heritage
3.0 3.0 3.0 2.0 3.0 2.0 3.0 2.0 2.0 2.0 3.0 2.0 2.0 3.0 Recreational 3.0 22.5 9.0 9.0 12.0 27.0 18.0 27.0 18.0 12.0 12.0 9.0 12.0 9.0
3.0 3.0 2.0 2.0 3.0 3.0 4.0 2.0 2.0 2.0 2.0 3.0 1.0 1.0 Amenity Visual/Landscape 3.0 22.5 9.0 6.0 12.0 27.0 27.0 36.0 18.0 12.0 12.0 6.0 18.0 3.0
2.0 2.0 2.0 1.0 3.0 3.0 1.0 2.0 3.0 1.0 1.0 3.0 1.0 1.0 Flood Conveyance 3.0 15.0 6.0 6.0 6.0 27.0 27.0 9.0 18.0 18.0 6.0 3.0 18.0 3.0
3.0 3.0 3.0 2.0 3.0 3.0 1.0 2.0 3.0 1.0 1.0 3.0 1.0 3.0
Stormwater Water Quality Treatment 2.0 15.0 6.0 6.0 8.0 18.0 18.0 6.0 12.0 12.0 4.0 2.0 12.0 6.0
2.0 2.0 2.0 1.0 1.0 2.0 2.0 1.0 3.0 2.0 3.0 2.0 1.0 1.0 Property Value 1.0 5.0 2.0 2.0 2.0 3.0 6.0 6.0 3.0 6.0 4.0 3.0 4.0 1.0 1.0 1.0 1.0 1.0 3.0 1.0 1.0 3.0 4.0 3.0 2.0 4.0 1.0 1.0
Economic Irrigation Supply 1.0 2.5 1.0 1.0 2.0 9.0 3.0 3.0 9.0 8.0 6.0 2.0 8.0 1.0
3.0 3.0 3.0 2.0 3.0 4.0 1.0 2.0 2.0 2.0 2.0 3.0 2.0 1.0 Local (estuarine) 4.0 30.0 12.0 12.0 16.0 36.0 48.0 12.0 24.0 16.0 16.0 8.0 24.0 4.0
4.0 4.0 4.0 2.0 3.0 3.0 1.0 2.0 2.0 2.0 2.0 3.0 2.0 1.0
Receiving Regional 3.0 Environmental 30.0 12.0 12.0 12.0 27.0 27.0 9.0 18.0 12.0 12.0 6.0 18.0 3.0
Legend Key Risk = Value x Threat x Sensitivity Threat Score Value Score Sensitivity Score Risk Range Shading Sensitivity is indicated in the upper right hand corner of each box. Very High 4 Very High 4 Very High 4 40 - 64 High 3 High 3 High 3 20 - 40 Medium 2 Medium 2 Medium 2 8 - 20 Low 1 Low 1 Low 1 0-8 Table 7.2 Risk Evaluation Results Balcombe Creek
To assist in the interpretation of the Table 7.2, cells have been shaded in different colours to represent varying levels of risk. High risk is indicated by dark shading, with shading becoming lighter as the risk reduces. The table in the lower right hand corner of Table 7.2 summarises the risk score ranges for the different shading bands.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK ASSESSMENT 54
The ranking of risks is undertaken to allow the necessary priorities to be established for determining appropriate management strategies. In the Balcombe Creek subcatchment the highest threats occur from Unsealed Road Runoff, Residential Development, Building Site Runoff and Residential Landuse. The following values are being impacted; Recreational and Visual/Landscape, Flood Conveyance, Local Receiving Environments and Regional Receiving Environments. Therefore the key risks in the subcatchment occur where high magnitude threats impact on high magnitude values, with Risk score indicating the relative magnitude of the risks. In the Balcombe Creek subcatchment the highest magnitude risk is generated by the threat of Residential subdivisional works to the Local Receiving Environment and has a magnitude of 48.
The numeric quantification of Individual Stormwater Risks allows them to be compared across the entire municipality. By ranking all risk scores the highest magnitude risks are identified. Table 7.3 provides a summary of the 73 highest magnitude risks throughout the entire municipality derived from the risk assessment process. This table represents the priority of risks across the entire municipality and will be used as the basis for identifying Stormwater Risk Issues in Chapter 9.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK ASSESSMENT 55
Table 7.3 Summary of Top 73 Risks
Risk Subcatchment Threat Value Risk Rank Magnitude
1 Watsons Creek Agriculture Local Receiving Environment 64 2 Nepean Septic and Sewer Leakage Groundwater 56 3 Balcombe Creek Residential Development Local Receiving Environment 48 4 Chinamans Creek Agriculture Groundwater 48 5 Chinamans Creek Agriculture Local Receiving Environment 48 6 Watsons Creek Agriculture Groundwater 48 7 Watsons Creek Agriculture Regional 48 8 Chinamans Creek Septic and Sewer Leakage Groundwater 42 9 Mt Martha Unstable and Degraded Waterways In-Stream Habitat 36 10 Mt Martha Unstable and Degraded Waterways Indigenous Heritage 36 11 Balcombe Creek Building Site Runoff (Lot Scale) Visual/Landscape 36 12 Chinamans Creek Agriculture Flood Conveyance 36 13 Chinamans Creek Agriculture Water Quality Treatment 36 14 Chinamans Creek Agriculture Regional 36 15 Kings Ck & Hastings Residential Development Local Receiving Environment 36 16 Kings Ck & Hastings Residential Development Regional 36 17 Mt Eliza Residential Land Use Runoff Regional 36 18 Balcombe Creek Unsealed Road Runoff Local Receiving Environment 36 19 Merricks Creek Unsealed Road Runoff Local Receiving Environment 36 20 Nepean Septic and Sewer Leakage Recreational 36 21 Chinamans Creek Agriculture In-Stream Habitat 32 22 Chinamans Creek Agriculture Riparian Habitat 32 23 Chinamans Creek Agriculture Irrigation Supply 32 24 Mt Martha Unstable and Degraded Waterways Geomorphology 32 25 Watsons Creek Agriculture Irrigation Supply 32 26 Chinamans Creek Septic and Sewer Leakage Recreational 31.5 27 Flinders Septic and Sewer Leakage Local Receiving Environment 31.5 28 Balcombe Creek Residential Land Use Runoff Local Receiving Environment 30 29 Balcombe Creek Residential Land Use Runoff Regional 30 30 Mt Martha Residential Development In-Stream Habitat 30 31 Mt Martha Residential Development Local Receiving Environment 30 32 Mt Martha Building Site Runoff (Lot Scale) Visual/Landscape 30 33 Flinders Septic and Sewer Leakage In-Stream Habitat 28 34 Balcombe Creek Unsealed Road Runoff Recreational 27 35 Balcombe Creek Unsealed Road Runoff Visual/Landscape 27 36 Balcombe Creek Unsealed Road Runoff Flood Conveyance 27 37 Balcombe Creek Unsealed Road Runoff Regional 27 38 Kings Ck & Hastings Unsealed Road Runoff Irrigation Supply 27 39 Kings Ck & Hastings Unsealed Road Runoff Local Receiving Environment 27 40 Merricks Creek Unsealed Road Runoff In-Stream Habitat 27 41 Merricks Creek Unsealed Road Runoff Recreational 27 42 Merricks Creek Unsealed Road Runoff Visual/Landscape 27 43 Mt Martha Unsealed Road Runoff In-Stream Habitat 27 44 Mt Martha Unsealed Road Runoff Visual/Landscape 27
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK ASSESSMENT 56
Table 7.4 Summary of Top 73 Risks
Risk Subcatchment Threat Value Risk Rank Magnitude
45 Mt Martha Unsealed Road Runoff Local Receiving Environment 27 46 Mt Martha Unsealed Road Runoff Regional 27 47 Olivers Creek Unsealed Road Runoff Flood Conveyance 27 48 Shoreham Unsealed Road Runoff In-Stream Habitat 27 49 Shoreham Unsealed Road Runoff Recreational 27 50 Shoreham Unsealed Road Runoff Visual/Landscape 27 51 Shoreham Unsealed Road Runoff Local Receiving Environment 27 52 Shoreham Unsealed Road Runoff Regional 27 53 Balcombe Creek Residential Development Visual/Landscape 27 54 Balcombe Creek Residential Development Regional 27 55 Balcombe Creek Residential Development Flood Conveyance 27 56 Balcombe Creek Building Site Runoff (Lot Scale) Recreational 27 57 Mt Eliza Residential Land Use Runoff Visual/Landscape 27 58 Mt Eliza Residential Land Use Runoff Local Receiving Environment 27 59 Nepean Residential Land Use Runoff In-Stream Habitat 27 60 Nepean Residential Land Use Runoff Recreational 27 61 Nepean Residential Land Use Runoff Visual/Landscape 27 62 Nepean Residential Land Use Runoff Local Receiving Environment 27 63 Nepean Commercial Land Use Runoff In-Stream Habitat 27 64 Nepean Commercial Land Use Runoff Riparian Habitat 27 65 Nepean Commercial Land Use Runoff Geomorphology 27 66 Nepean Commercial Land Use Runoff Recreational 27 67 Nepean Commercial Land Use Runoff Visual/Landscape 27 68 Nepean Commercial Land Use Runoff Local Receiving Environment 27 69 Merricks Creek Unstable and Degraded Waterways In-Stream Habitat 27 70 Merricks Creek Unstable and Degraded Waterways Indigenous Heritage 27 71 Shoreham Unstable and Degraded Waterways In-Stream Habitat 27 72 Shoreham Septic and Sewer Leakage Recreational 27 73 Merricks Creek Septic and Sewer Leakage Recreational 27
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 57
8 MANAGEMENT FRAMEWORK REVIEW
Council’s Management Framework is concerned with the way in which Council undertake their ‘day to day’ planning and management activities. This includes strategic planning, development assessment, infrastructure management, regulation and enforcement, coordination and communication with internal and external stakeholders. These activities have a direct and indirect bearing on achieving Best Practice in stormwater management.
This section of the report provides a review of Council’s Management Framework as it relates to stormwater management within the municipality. The review has been undertaken as part of a consultative process involving Council officers who participate in making planning and management decisions. The review process was based on a series of interviews with Council and agency officers and workshop sessions where the issues were discussed.
A list of interviewees is included in Appendix F in Volume III.
8.1 Management Framework Functions
Mornington Peninsula Shire Council’s management framework encompasses all planning and management activities that relate to the ongoing management of infrastructure, provision of services and planning for development. These activities specifically include: · strategic and statutory planning; · development approvals; · local laws, regulation and enforcement; · infrastructure maintenance; · environmental management; and · community education and awareness.
An effective management framework will enable Council to manage stormwater proactively through its planning, coordination and regulatory roles. This will limit the need for retrospective management of stormwater threats that could have been avoided with a better management framework.
Improvements in the management framework will also limit reliance on costly reactive measures and will create important synergies between Council departments and other regulatory authorities.
The Mornington Peninsula Shire Council undertakes the following planning and management framework activities. · Sets Strategic directions through:
o Council’s Community Plan. This Plan outlines the broad policy and objectives of Council and is linked (broadly) to the Mornington Peninsula Planning Scheme. It has a number of strategies that are particularly relevant to stormwater management. o The Municipal Strategic Statement (MSS) The MSS is part of the Mornington Peninsula Planning Scheme. The MSS develops a vision for the future of the Mornington Peninsula,
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 58
expressed in terms of a number of major objectives, and sets in place a strategic framework to achieve these objectives. · Council’s Local Planning Policies are developed by Council to address specific issues that warrant expanded reference and/or statutory management in the Scheme. The Shire has developed the following Local Policies: § Industrial Subdivision and Design; § Commercial Subdivision and Siting; § Dwelling Density, Excisions and Realignments in Rural Areas; § Development on Highways, Main Roads and Tourist Routes; § Commercial and Industrial Uses in Rural Areas; § Yaringa Area; § Mornington Peninsula Fire Protection Policy; § Non Residential Uses in Residential Zones; § Township Environment; § Mornington Peninsula Land Units; and § Broiler Chicken Farms. · Assesses and approves planning permit applications for land use and development in accordance with state legislation, the Mornington Peninsula Planning Scheme (the Scheme) and local policies. · Assesses and approves land use and development in accordance with local requirements set out in Council Local Laws and technical specifications and guidelines. · Ensures that the requirements of Council are complied with through planning enforcement actions and enforcement of local laws. · Educates the community in relation to Council initiatives through community awareness programs and provision of guidelines and necessary information. · Carries out the physical works and operations related to the construction and maintenance of Council assets and infrastructure. · Liaises with other authorities to coordinate decision making tasks that relate to stormwater management. These authorities include: § Melbourne Water Corporation; § Environment Protection Authority; § Department of Natural Resources and Environment; § Parks Victoria; § Department of Infrastructure; § Southern Rural Water; § Port Phillip Catchment and Land Protection Board (CALP);
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 59
§ ‘Friends’ groups; § Adjoining municipal Councils; § Municipal Association of Victoria; § Building Control Commission; § VicRoads; § Master Builders Association; and § Housing Industry Association.
8.2 Organisational Structure
Many different departments of council have responsibility for various aspects of stormwater management within the Shire. The organisation structure is illustrated in Figure 8.1, which also identifies, with shading, business units and groups that are directly involved with stormwater management. The diagram illustrates the challenges associated with improving the management framework as management responsibility is spread across the organisation. Therefore, co-operation will be required across many business units to achieve improvements in stormwater management.
Key groups involved with stormwater management are the Executive, Infrastructure and Physical Services Group and the Planning and Environment Group. Each of these groups is discussed below in the following sections, with specific reference to the individual business units, their role within council and their management responsibilities in relation to stormwater.
8.2.1 Infrastructure and Physical Services
Infrastructure and Physical Services are responsible for all routine maintenance services throughout the municipality. This group is also responsible for the administration of the Asset Management System, Geographical Information Systems (GIS), and the Capital Works Program. The other key responsibility of this group includes regional drainage and rural catchment management for areas not managed by Melbourne Water. The core of this group is located at the Rosebud office.
The Infrastructure and Physical Services Group contains three departments, Infrastructure Planning, Infrastructure Design and Infrastructure Services. The activities of this group are predominantly related to the on-ground implementation of works and services and will therefore have a significant impact on stormwater management. In this regard, any recommendations from the Plan that respond to existing threats are likely to be implemented and maintained by this group. This group also has a key role in coordinating with the Planning and Environment Group to ensure services are provided to new areas of development, infrastructure built by developers conforms to the Shires technical standards and is adequately maintained until management responsibility is transferred to council.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 60
Council
Executive Group
Conservation Management Infrastructure & Community Services Planning & Planner Support Group Physical Services Group Environment Group Local Laws Infrastructure Planning & Policy Child Youth & Family Conservation & Planning Finance Corporate Planning & Services Environment Services Scheme Controls Asset Projects Infrastructure Planning Management Public Health Information Technology & Subdivision Aged and Disability Telecommunications Services Services Fire Prevention Communications Building Services Corporate Support & Recreation & Culture Governance Strategic Planning Infrastructure Design Business Road & Drainage Support Maintenance Libraries Team Support & Economic Development Building Development Infrastructure Services Open Space & Surveying Environment Property Team Building Maintenance
Tourism Waste Management Operations Statutory Planning
MP Automotive Services
Figure 8.1 MPSC Organisational Structure (Shading indicates business unit or group is involved with Stormwater management)
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 61
The Infrastructure Planning Unit is responsible for providing and maintaining stormwater infrastructure for the municipality. The responsibilities of this group in relation to stormwater management include · Planning and prioritising capital works via the Infrastructure Planning and Policy Unit Team; · Managing existing Shire assets such as drains and open space via the Asset Management Team; and · Managing subdivisional works and service provision via the Subdivision Services Team.
The Infrastructure Design Unit is responsible for the design and construction supervision of all Shire infrastructure works. Major projects undertaken by this group recently include the design and construction of the Serpentine Wetlands and the rehabilitation of Hearn Creek and Tanti Creek.
Infrastructure Services are responsible for all Shire assets including roads, drainage assets and areas of open space. Its activities have a significant impact on the management of stormwater as they are responsible for the cleanout of gross pollutant traps, the protection of bushland and stream frontages, street sweeping and waste management services.
8.2.2 Planning and Environment
The Planning and Environment Group is responsible for strategic and statutory planning, conservation, the environment and economic development throughout the shire. Departments with influence on stormwater management include Conservation and Environmental Services, Strategic Planning and Statutory Planning. The group is located at the Mornington Office.
In relation to stormwater management Conservation and Environment Services are responsible for enforcing local laws, enforcing planning scheme controls, issuing permits for septic systems and providing policy and strategic direction for natural resource management issues. A significant part of the on-going business of this group includes the development of guidelines and liaison with the community to reduce the impacts of development on the environment and improve their understanding of natural environments.
Strategic Planning is responsible for setting the landuse framework for the municipality via the Planning Scheme. In regards to stormwater management this groups contributes to the development of Local Policies and overseas the type and pace of development within the Shire.
Statutory Planning is responsible for implementing the Planning Scheme. A key element of this role is the processing of development applications, which often includes internal and external referrals of stormwater management issues. This unit is currently processing in excess of 3000 planning approvals per annum.
The responsibility of Building Surveying falls under the Economic Development Department. This team is responsible for tracking building works underway within the Shire, inspection of building works and advice regarding the discharge of stormwater from individual lots.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 62
8.2.3 Executive
The Executive is responsible for the overall direction of the Shires activities and strategies and acts as the link between the Councillors and officers. The Communications Department is the only department of the Executive that is directly involved with stormwater management, as it is responsible for coordinating communication between council staff and the wider community. This department is responsible for the publication of the Shires newsletter (Peninsula Wide), the website and press releases to the local media.
8.3 Regional Drainage Responsibility
Following the State Government’s process of drainage authority amalgamations and the formation of Catchment Management Authorities during the 1990’s, regional drainage responsibility across the Shire has been fragmented. The area of the municipality that was formerly the Shire of Hastings and parts of the City of Frankston continue to fall under the jurisdiction of Melbourne Water, while regional drainage responsibilities in the former municipalities of Flinders and Mornington remain with the Shire. This arrangement has broad implications on stormwater management for the municipality. Both Melbourne Water and Council acknowledge the complexity of the issues and are committed to continued negotiations at senior levels to ensure the matter is resolved.
A Due Diligence Study (Condina and Craigie, 1998) was undertaken jointly by the Shire and Melbourne Water to identify regional drainage limitations and the condition and value of assets. Resolution of the issue requires direction from the State Government. In light of the ongoing nature of the issue and cost implications of maintaining regional drainage, currently $3.5 million per annum, the Shire has committed to ending funding at the end of the 2000/2001 financial year. It will therefore be necessary to resolve this issue as a matter of high priority.
8.4 Development Planning and Approvals
8.4.1 Overview of Development within the Shire
Development for development’s sake is not an actively pursued goal of the Shire, where emphasis on environmental and landscape conservation is a preferred strategic outcome. Nonetheless, there are still substantial areas set aside for further residential development (over 18,500 lots could potentially become available). The majority of new urban development activity is currently in the Mornington East area and it is expected that this will continue for some time. There are other smaller areas of development distributed throughout the municipality, but none are as extensive as the Mornington East area. Another source of ongoing development is the re-development of existing properties in established areas.
These issues of development and growth both from new developments (residential, industrial, rural) and from an increasing permanent population within developed areas impacts on stormwater quality and quantity. These impacts relate to the impacts generated during the subdivision and building phase and the ongoing threat of the landuse.
Development in turn has broader implications on the Peninsula’s natural watercourses and streamlines, beaches and sensitive receiving environments. Many of these issues have been
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 63
investigated and identified within the Stormwater Risk Assessment. This section of the report documents how the management framework can be improve to reduce the impact of developments on stormwater quality.
8.4.2 Planning Permits
The Shire is responsible for overseeing and controlling land use and development and much of this activity is managed via the planning approvals process. The planning approval process makes decisions about a number of issues including: · The conversion of land use; and · The nature of site development, including buildings and landscaping.
Through its planning approval process Council can establish conditions under which development can proceed. The Statutory Planning Department is responsible for managing the permit approval process and issuing planning permits. In assessing applications and preparing conditions for planning permits, Council acts as the responsible authority. In this duty, officers are often faced with technical issues that are outside their field of knowledge and require input from other officers or Agencies. Depending on the nature of the issue, Council can refer the matter internally to other Council departments for comment. Also, under Section 55 of the Planning & Environment Act (1987), the responsible authority must give a copy of an application to any person or body that the scheme specifies as a referral authority for written comment (examples of typical referral authorities in relation to stormwater include Melbourne Water and EPA). The quality of the information derived from internal and external referrals will be impacted by the quality of the referrals and the response received. Referrals are considered in more detail in subsequent sections.
Under Section 58 of the Planning & Environment Act, the responsible authority must consider every application for a planning permit. During the twelve months of the year 2000, Council processed approximately 2800 applications. Upon receipt, Council will allocate a planning permit application to a planning officer whose role is broadly to assess the application. Assessing an application may include: · referral for comment; · advertising of permit application to identify objectors; · liaison with the applicant (and objectors); · application of appropriate conditions; and · advise Council that the application be approved or refused.
This process varies only slightly from Council to Council and it is assumed that planners understand each step of the process. Although the process is usually clearly understood by all, the various components of the process can be quite complex and/or have different outcomes depending on the approach of the council officer. There is an opportunity to document this planning process, to ensure it is maximised and to facilitate some sort of continuity in dealing with stormwater issues, particularly in relation to referrals. The Internal and external referrals process are discussed in subsequent sections.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 64
Often new members of staff, particularly in the planning department, have extensive metropolitan experience but limited rural, semi rural or coastal experience. They therefore have a limited understanding of the environmental and stormwater management issues specific to the Shire. In light of the unique environmental characteristics of the Shire, it is fundamental that staff have a sound understanding of the challenges that this environment presents.
8.4.3 Internal Referrals
During the Management Framework Review the internal referral process was identified by council officers as operating satisfactorily. The operation of the referral process was attributed to the experience of a number of officers and the informal communication networks between the planning department and other departments. The advantages of the current system were also acknowledged as potential impediments for the future operation of the system as there was no method of recording and documenting individuals knowledge and experience. Therefore the loss of a relatively few staff members could have a significant impact on the effectiveness of the referrals process.
Within Council, stormwater referrals, when they are made, are directed to a single individual. There is an opportunity to streamline this internal referral mechanism by drawing on the broader identified skill base in Council, and possibly establishing a drainage infrastructure section. By doing so, Council would be facilitating a clearer referral process with respect to stormwater and drainage matters.
The need to clarify responsibility for stormwater quality issues was identified. Whilst there is clear responsibility for drainage and flood plain management issues within council, there is a lack of both in-house knowledge and responsibility for water quality issues. This issue is often compounded by the lack of a regional drainage authority over much of the municipality, who could support and provide specialist water quality advice.
8.4.4 External Referrals
A number agencies contribute to management of the water cycle with the Shire. Often these agencies are called upon to comment and place conditions on planning permits. Key agencies include the following: · Melbourne Water; · Environmental Protection Authority; · Southern Rural Water; · Department of Natural Resources and Environment; and · South East Water.
Issues relating to external referrals were predominantly related to deficiencies in communication with particular agencies, reluctance of agencies to take on management responsibility and the format of referrals. The communication issues between Council and other agencies is discussed in a subsequent section and regional responsibility has been examined in Section 8.3.
A number of agencies identified the quality of referrals documentation they receive as an impediment to best practice. It was identified that often referrals are received without clear indication of what part
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 65
of the application was to be responded to. This lack of clear direction can inhibit the planning process as agencies either respond to the wrong issue or apply conditions that are difficult for council to impose and enforce. It was identified that referrals that are made to referral authorities are often received with limited background information or direction from council in terms of the comments that are being sought. Referral authorities are required to address many applications and are required to do so quickly, and without the advantage of local knowledge that Council has. It was identified that responses are likely to be of a better quality and turned around quicker if Council were to identify any particular concerns or highlight matters it envisages need to be addressed.
8.5 Strategic Planning
Strategic Planning has an important role in the management framework as it provides tools for statutory planners to reduce the impacts of development on the environment. In this regard, there may be an opportunity to explore the better use of existing tools in the planning scheme such as Local Policy 22.13 Township Environment. This policy has a broad application across the Shire and is already geared towards addressing matters such as stormwater. There are several opportunities to convert the strategic directive to a statutory obligation, including the placement of provisions on planning permits, empowerment of planning department staff and the development and implementation of new technical standards that are aimed at reducing the environmental impacts of stormwater.
There a number of other opportunities for strategic planning initiatives to improve stormwater management, including: · The development of a broad policy addressing stormwater quality issues across the municipality; · Mapping information to alert buyers or developers at an early stage that there are implications and obligations regarding stormwater for particular sites; and · Development of Local Policies for particular areas or types of development within the Shire that have sensitive stormwater management issues. The existing documentation was also reviewed as part of the management framework review and is reported in Section 8.9.
8.6 Co-ordination
In addition to Council, a number of agencies contribute to management of the water cycle within the municipality. Effective co-ordination of management responsibilities amongst the stakeholders is essential for the effective management of stormwater. In addition to regional drainage responsibilities, which have been discussed previously, responsibility has to be assigned to groundwater resources within the municipality. At present Southern Rural Water is responsible for preserving the aquifers and regulating extractions, but does not take responsibility for its quality. EPA has some responsibilities related to the quality of the aquifer but does not consider itself a resource manager. The lack of clear responsibility for this resource has significantly limited opportunities to manage and protect this valuable and sensitive resource.
To ensure co-ordination is optimised and outcomes are not impeded by confusion regarding responsibilities, it is considered important that clarification of roles regarding stormwater
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 66
management amongst all relevant agencies be identified. Throughout the municipality an integrated approach between multiple agencies is desirable to ensure effective management of the entire water cycle, i.e. groundwater, wastewater and stormwater.
8.7 Communication
8.7.1 Inter Departmental Communication
Council is committed to a philosophy of integrated decision making across the organisation that is known as ‘the Peninsula Way’. Developed by Council, the Peninsula Way is a system of conduct that is being adopted to facilitate open and effective communication between various disciplines within Council. A key objective of the program is to encourage a system of networking within the organisation that will open boundaries and generate optimum outcomes. The program has senior level support and commitment within Council.
The Shire currently supports three offices in Hastings, Rosebud and Mornington. The distribution of these offices reflects the size of the municipality and the local government structure prior to amalgamation. Council’s various groups are distributed throughout these offices. Key departments in relation to stormwater management are Infrastructure and Physical Services and Planning and Environment, which are located at the Rosebud and Mornington Offices respectively.
The distribution of staff between three offices has an effect on ‘day to day’ communication between departments as it limits opportunities for informal contact between officers. Where a specific project warrants a meeting, these are easily accommodated, with staff travelling between offices to meet when necessary. It is informal inter-departmental networking that might otherwise be expected to occur that is somewhat stifled. The lack of informal networking has implications on the referral process. Prior to amalgamation staff of the former municipalities were contained within the same office and were able to meet regularly and informally to discuss planning applications and exchange information. Now the two departments that are most often involved in referral matters, Infrastructure and Physical Services and Planning and Environment, are located in different offices and communication tends to be more formal. The development of informal communication between these groups, particularly for new staff, needs to be facilitated.
8.7.2 Inter Agency Communication
Communication between Council and other agencies involved in the management of the water cycle was also examined. Several agencies, e.g. Environment Protection Authority and Melbourne Water, have either formal or informal client managers who form the link between the agency and Council. The role of the client manager is to facilitate the service provision to Council and to improve the quality of service by ensuring council queries are addressed by the appropriate members of the agency. The use of client managers by agencies was identified as a successful program and it was hoped that it could be extended to other agencies involved within the water cycle on the Peninsula.
8.7.3 Community
It was broadly recognised that there is ongoing potential to continue to strengthen communications between Council and the community regarding their contribution to sound stormwater management
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 67
practices. Linking into community groups in this way will assist in raising awareness of stormwater management issues.
In an effort to increase community awareness of waste management and environmental issues, Council has recently appointed a Regional Education Officer within the Waste Management Group. A key responsibility of this position is to undertake education programs both within Council and the community regarding waste management issues. This is a positive step that will improve education and communication both internally and externally. The appointment also provides an important opportunity to identify and link into resources outside of Council such as the Municipal Association of Victoria and the Building Control Commission.
8.8 Resourcing
Council officers are charged with the responsibility of undertaking various duties on behalf of Council. As the Shire develops and land uses change, their role becomes increasingly complex and demanding. It is therefore not surprising that this municipality, like most, would benefit from increased staff numbers. Due in part to financial limitations, this is not always possible. However, it was recognised that increased staff numbers would be necessary to contribute to the completion of tasks that impact positively on sound stormwater management, such as the monitoring of permit conditions, undertaking inspections of building sites and stormwater assets under construction and the enforcement of local laws. At a strategic development level, additional staff could be used to develop tools such as Outline Development Plan’s.
The Shire is fortunate to have substantial ocall knowledge amongst its existing officers, many of whom have lived and worked on the Peninsula for many years. This resource, although difficult to quantify, is valuable to the Shire and could be better harnessed, particularly in the referral process that Council conducts. There is an opportunity to introduce experienced staff to the referral process and relieve the workload that currently falls on one or two officers.
8.9 Documentation
8.9.1 Strategic Documentation
Mornington Peninsula Shire Council is committed to achieving sustainable environmental outcomes for the Shire. This strategic direction is demonstrated in its Strategic documents, i.e. Community Plan and Planning Scheme (notably the MSS and Local Policies), where Council has chosen to rate the environment and related issues highly.
The Community Plan has a clear environmental directive that could be expanded to provide stronger emphasis on appropriate actions for better stormwater management, particularly given the Peninsula’s location adjacent to key receiving environments. By doing this, Council is providing the necessary impetus for the implementation of the stormwater management plan. Through the Plan’s key priorities, particularly Priority 1: To Protect Our Environment, and Priority 4: To Provide and Enhance Physical Infrastructure, Council will be able to strengthen its directive in relation to stormwater management.
The Shire’s Municipal Strategic Statement identifies that stormwater is an important issue for the Shire, in particular the need for the provision of appropriate stormwater treatment measures for new
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK REVIEW 68
developments. Council’s commitment to achieving environmental objectives with regards to stormwater is expressly stated in the MSS through the strategic objective of developing stormwater management plans.
8.9.2 Geographical Information system (GIS)
At the time of amalgamations, Council adopted the existing mapping information that had been developed by each of the municipalities. All of the information was stored in hard copy format and not always complete. As a result data describing the stormwater system has been compiled from these records and has limitations due to the accessibility of data. In addition, some of the mapping information is based on design drawings and is not consistent with the constructed systems, raising questions of accuracy of the information. Problems relating to data are manageable but require staff and time to correct. A desired outcome is the commissioning of the GIS system so that all staff have access to the data at their desks.
8.10 Regulation and Enforcement
Within Council, various departments take responsibility for the day to day tasks that Council addresses including planning, building, engineering, environmental, health, community, education and operational tasks. In addition Council creates and enforces local laws under jurisdiction afforded to it under the Local Laws Act .
The local law framework is an effective system in relation to ensuring good stormwater management outcomes, particularly when applied fully and consistently. The existing local laws of the Shire might be reviewed and/or extended to expand and strengthen their current impact. There may be opportunities to use local laws to ‘capture’ some of the control lost through the deregulation of building permits and to reduce the impact of development activities on sites with planning permits. Existing tools such as the Litter Act can be employed to enhance the local law system, particularly when the objective is to control litter from building sites. Checking that permit conditions are adhered to, general monitoring and inspections could be increased with a proactive effect (catching potential problems before they arise).
Enforcement is closely linked to resourcing issues – there is a direct correlation between officer numbers in the field and opportunities to undertake enforcement activities. These enforcement activities alone will not address stormwater related matters but they are recognised as an important tool in demonstrating that Council is serious about achieving its desired stormwater management outcomes.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PRIORITY MANAGEMENT ISSUES 69
9 PRIORITY MANAGEMENT ISSUES
9.1 Identification of Key Stormwater Issues
As discussed in Chapter 2, the major outcome of the development of the Mornington Peninsula Shire Council’s Stormwater Management Plan is the recommendation of two types of management strategies as follows: · Stormwater Risk Management Strategies; · Planning and Management Framework Strategies/Recommendations.
For the Stormwater Management Plan to be successful it is important that management strategies are targeted at the key stormwater issues within the municipality. These issues are referred to as the Priority Management Issues and were identified during the second phase of the project (Figure 9.1). Stormwater Risk Issues were based on the results of the Risk Assessment, the results of which are reported in Chapter 7. Planning and Management Framework Issues were based the review of the existing management framework (reported in Chapter 8). The results of both the Risk Assessment and Management Framework Review were presented to the Project Working Group for their discussion and prioritisation. Phase 1 Phase 2 Phase 3 Phase 4
Finalise Management Plan Preliminary Activities Priority Management Issue Identification Stormwater Development Management Plan
Collate and Values Review Available Assessment Data Stormwater Risk Management Assessment Identify Local Strategies Stormwater Stormwater REACTIVE Submit Management Threats Priority Stormwater Issues & Strengths Management Management Issues Plan
Management Management Framework Framework Review Strategies PROACTIVE
Figure 9.1 Study Process and Strategy Development
9.2 Stormwater Risk Issues
The list of prioritised risks presented in Table 7.3 is used as a basis for identifying Stormwater Risk Issues. The priority of Issues reflects priority of Risks, with Risks of higher magnitude having higher priority. The nature of the Risk Assessment process is such that in many instances, lower magnitude Risks can be grouped under a particular issue, due to the risk occurring from a similar threat in the same subcatchment or a threat that can be managed generically across several subcatchments. The grouping of Stormwater Risk Issues under common threats typically requires approximately 10 separate management strategies to cover the first 20 to 30 Risks.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PRIORITY MANAGEMENT ISSUES 70
Table 9.1 presents the results of the Risk Analysis after they have been assigned to the different Stormwater Risk Issues. The first 73 risks were grouped into 12 Issues, with the groupings reflecting specific threats in a particular subcatchment, such as Issue 1, or a generic threat that was present in a number of catchments, such as Issue 2. The following list summarises the results of the Risk Analysis by identifying the 12 highest priority Stormwater Risk Issues, their catchment/s, threat and value/s: 1. Runoff from the Market Garden Areas in Watsons Creek - Watsons Creek has been identified as having high nutrient levels generated from intensive agricultural activities. The high nutrient levels have the potential to significantly degrade receiving environments within Westernport and at the outlet of Watsons Creek (Quail Island); 2. Septic Tank Systems with the Nepean Peninsula - The residential areas of the Nepean and Chinamans Creek catchment are largely dependent on septic tank systems to treat wastewater. Septic systems are used as reticulated sewer is either not available or properties are not connected. Commercial areas in this catchment are currently in the process of being connected to the reticulated sewer system as part of South East Waters Backlog Program. The septic systems are having a significant impact on the quality of groundwater, with elevated levels of nutrients and pathogens being recorded. For the purposes of the strategy development the two subcatchments are combined as the issue refers to the values and threats that cross the subcatchment boundary; 3. Residential subdivisional development within the Balcombe Creek, Hastings and Mt Martha subcatchments - Poor sediment and erosion control practices within new residential subdivisions are generating high sediment loads that have the potential to impact on downstream receiving environments; 4. Runoff from the Market Garden Areas in Chinamans Creek - Farming practices associated with the market garden areas are resulting in the export of nutrients, which are impacting groundwater resources, Tootgarook Swamp and Port Phillip; 5. Unstable Waterways in Mt Martha - Several waterways suffer from on-going erosion, with large erosion heads propagating up stream, generating sediment and nutrient loads which are threatening the Local Recieving Environment; 6. Building Site Runoff in Balcombe Creek and Mt Martha – Buildings sites throughout the municipality and in these areas in particular are often poorly managed and generating large loads of sediment and litter; 7. Runoff from Residential areas within Mt Eliza, Nepean and Balcombe Creek subcatchments – Existing residential areas in a number of catchments have been identified as posing threats to receiving environments; 8. Unsealed Roads throughout the Municipality – The municipality contains many unsealed roads, which have the potential to generate large sediment loads; 9. Septic Tank Leakage in Flinders – The Flinders Township is unsewered and overflow from septic systems to Dodds Creek has the potential to impact on the recreational amenity associated with the foreshore and adjacent aquatic environments.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PRIORITY MANAGEMENT ISSUES 71
10. Commercial areas within the Nepean Catchment – The Nepean catchment contains several commercial areas that are located adjacent to Port Phillip and have significant potential to deliver pollution to the foreshore; 11. Waterway Degradation in Merricks Creek and Shoreham catchments – Ongoing waterway degradation has been identified within these subcatchments and the generated sediment and nutrient loads is impacting on estuarine environments; and 12. Septic Tank Leakage in Merricks and Shoreham – These small hamlets are unsewered and overflow from septic systems has the potential to impact on the recreational amenity associated with the foreshore and adjacent aquatic environments. Table 9.1 Summary of Top 73 Risks and Issue Groupings
Risk Subcatchment Threat Value Risk Stormwater Rank Magnitude Issue
1 Watsons Creek Agriculture Local Receiving Environment 64 1 2 Nepean Septic and Sewer Leakage Groundwater 56 2 3 Balcombe Creek Residential Development Local Receiving Environment 48 3 4 Chinamans Creek Agriculture Groundwater 48 4 5 Chinamans Creek Agriculture Local Receiving Environment 48 4 6 Watsons Creek Agriculture Groundwater 48 1 7 Watsons Creek Agriculture Regional 48 1 8 Chinamans Creek Septic and Sewer Leakage Groundwater 42 2 9 Mt Martha Unstable and Degraded Waterways In-Stream Habitat 36 5 10 Mt Martha Unstable and Degraded Waterways Indigenous Heritage 36 5 11 Balcombe Creek Building Site Runoff (Lot Scale) Visual/Landscape 36 6 12 Chinamans Creek Agriculture Flood Conveyance 36 4 13 Chinamans Creek Agriculture Water Quality Treatment 36 4 14 Chinamans Creek Agriculture Regional 36 4 15 Kings Ck & Hastings Residential Development Local Receiving Environment 36 3 16 Kings Ck & Hastings Residential Development Regional 36 3 17 Mt Eliza Residential Land Use Runoff Regional 36 7 18 Balcombe Creek Unsealed Road Runoff Local Receiving Environment 36 8 19 Merricks Creek Unsealed Road Runoff Local Receiving Environment 36 8 20 Nepean Septic and Sewer Leakage Recreational 36 2 21 Chinamans Creek Agriculture In-Stream Habitat 32 4 22 Chinamans Creek Agriculture Riparian Habitat 32 4 23 Chinamans Creek Agriculture Irrigation Supply 32 4 24 Mt Martha Unstable and Degraded Waterways Geomorphology 32 5 25 Watsons Creek Agriculture Irrigation Supply 32 1 26 Chinamans Creek Septic and Sewer Leakage Recreational 31.5 2 27 Flinders Septic and Sewer Leakage Local Receiving Environment 31.5 9 28 Balcombe Creek Residential Land Use Runoff Local Receiving Environment 30 7 29 Balcombe Creek Residential Land Use Runoff Regional 30 7 30 Mt Martha Residential Development In-Stream Habitat 30 3 31 Mt Martha Residential Development Local Receiving Environment 30 3 32 Mt Martha Building Site Runoff (Lot Scale) Visual/Landscape 30 6 33 Flinders Septic and Sewer Leakage In-Steam Habitat 28 9
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PRIORITY MANAGEMENT ISSUES 72
Table 9.2 Summary of Top 73 Risks and Issue Groupings (continued)
Risk Subcatchment Threat Value Risk Stormwater Rank Magnitude Issue
34 Balcombe Creek Unsealed Road Runoff Recreational 27 8 35 Balcombe Creek Unsealed Road Runoff Visual/Landscape 27 8 36 Balcombe Creek Unsealed Road Runoff Flood Conveyance 27 8 37 Balcombe Creek Unsealed Road Runoff Regional 27 8 38 Kings Ck & Hastings Unsealed Road Runoff Irrigation Supply 27 8 39 Kings Ck & Hastings Unsealed Road Runoff Local Receiving Environment 27 8 40 Merricks Creek Unsealed Road Runoff In-Stream Habitat 27 8 41 Merricks Creek Unsealed Road Runoff Recreational 27 8 42 Merricks Creek Unsealed Road Runoff Visual/Landscape 27 8 43 Mt Martha Unsealed Road Runoff In-Stream Habitat 27 8 44 Mt Martha Unsealed Road Runoff Visual/Landscape 27 8 45 Mt Martha Unsealed Road Runoff Local Receiving Environment 27 8 46 Mt Martha Unsealed Road Runoff Regional 27 8 47 Olivers Creek Unsealed Road Runoff Flood Conveyance 27 8 48 Shoreham Unsealed Road Runoff In-Stream Habitat 27 8 49 Shoreham Unsealed Road Runoff Recreational 27 8 50 Shoreham Unsealed Road Runoff Visual/Landscape 27 8 51 Shoreham Unsealed Road Runoff Local Receiving Environment 27 8 52 Shoreham Unsealed Road Runoff Regional 27 8 53 Balcombe Creek Residential Development Visual/Landscape 27 3 54 Balcombe Creek Residential Development Regional 27 3 55 Balcombe Creek Residential Development Flood Conveyance 27 3 56 Balcombe Creek Building Site Runoff (Lot Scale) Recreational 27 6 57 Mt Eliza Residential Land Use Runoff Visual/Landscape 27 7 58 Mt Eliza Residential Land Use Runoff Local Receiving Environment 27 7 59 Nepean Residential Land Use Runoff In-Stream Habitat 27 7 60 Nepean Residential Land Use Runoff Recreational 27 7 61 Nepean Residential Land Use Runoff Visual/Landscape 27 7 62 Nepean Residential Land Use Runoff Local Receiving Environment 27 7 63 Nepean Commercial Land Use Runoff In-Stream Habitat 27 10 64 Nepean Commercial Land Use Runoff Riparian Habitat 27 10 65 Nepean Commercial Land Use Runoff Geomorphology 27 10 66 Nepean Commercial Land Use Runoff Recreational 27 10 67 Nepean Commercial Land Use Runoff Visual/Landscape 27 10 68 Nepean Commercial Land Use Runoff Local Receiving Environment 27 10 69 Merricks Creek Unstable and Degraded Waterways In-Stream Habitat 27 11 70 Merricks Creek Unstable and Degraded Waterways Indigenous Heritage 27 11 71 Shoreham Unstable and Degraded Waterways In-Stream Habitat 27 11 72 Shoreham Septic and Sewer Leakage Recreational 27 12 73 Merricks Creek Septic and Sewer Leakage Recreational 27 12
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PRIORITY MANAGEMENT ISSUES 73
9.3 Key Management Framework Issues
Based on the results of the Management Framework Review, a number of key opportunities have been defined in consultation with Council and the Project Working Group. The key management issues that were identified as needing to be addressed in achieving best practice for the management of stormwater are summarised as follows in the order of priority that they were allocated by the Project Working Group: 1. Regional Drainage Responsibility - Resolution of roles and responsibilities for regional drainage on the Peninsula need to be resolves; 2. Interagency Communication - Co-ordination and communication at various levels between Council, Melbourne Water, EPA, NRE and South East Water should be improved; 3. Strategic Direction – A review of Council’s strategic documents including its Community Plan, Municipal Strategic Statement and local policies is considered important to allow the inclusion of stormwater management issues; 4. Intradepartmental Communication and Education – Informal communication within the organisation is difficult due to the geographic locations of some departments and this reduces the potential to transfer information through the organisation, particularly to newer staff; 5. Referral Process – The referral process is operating well but opportunities were identified to optimise the system; 6. Resourcing – Staff numbers in key areas such as enforcement and planning appear to be lacking; 7. Communication with the Community – The role of gaining community support for action on stormwater issues and recognising their environmental objectives was identified; and 8. Drainage System Documentation – The current system that documents the stormwater system is cumbersome and does not contain complete or necessarily accurate data;
9.4 Stormwater Risk and Management Framework Linkages
The Priority Risk and Management Framework Issues are closely linked. In many cases, unresolved Management Framework Issues will ultimately lead to the Risks. The identification of linkages between these issues is important so that integration between strategies in the Stormwater Management Plan can be optimised. These linkages also provide an important understanding of how Stormwater Risk Issues have arisen in the past due to Management Framework Issues.
Table 9.3 outlines the nature of linkages that exist between Priority Risk and Management Framework Issues.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PRIORITY MANAGEMENT ISSUES 74 Table 9.3 Summary of Risk and Management Framework Linkages
Management Framework Issues Regional Interagency Strategic Interdepartment Referral Process Resourcing Drainage System Communication Drainage Communication Direction Communication/ Documentation with the Responsibility Education Community
Runoff from the Market Garden Areas in Watsons Landuse and its More resources will Creek; relationship to the provide more drainage system opportunities for could be Improved extension activities investigated to communications to farmers identify potential with bodies such as pollutant sources NRE, South East Septic Tank Systems Water and EPA will within the Nepean assist in the Resources would development of Peninsula allow septic systems solutions to be regularly Communication Recognition of inspected and with the community Resolution of An improved Stormwater inadequate systems will raise the regional drainage referral system will Management as a upgraded to reduce awareness of issues will allow ensure that new strategic issue of impacts stormwater greater technical developments or will allow greater management and and on-ground changes in landuse technical and on- encourage the Residential subdivisional resources to be will implement ground resources to Documentation of community to take development within the committed to solving effective stormwater be committed to Improvements will the drainage system their own actions to Balcombe Creek, stormwater Improved building management Resource capacity solving stormwater allow the potential would ensure that reduce the impact pollution issues site practices measures limits enforcement Hastings and Mt Martha pollution issues impacts of new new areas of they have on
Stormwater Risk Issues require support at a of conditions on new subcatchments developments to be development are stormwater regional level development. identified able to connect to the drainage system
Runoff from the Market Garden Areas in Improved Landuse and its Chinamans Creek communications More resources will relationship to the with bodies such as provide more drainage system NRE and EPA will opportunities for could be assist in the extension activities investigated to development of to farmers identify potential solution pollutant sources
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PRIORITY MANAGEMENT ISSUES 75 Table 9.3 Summary of Risk and Management Framework Linkages
Management Framework Issues Regional Interagency Strategic Intradepartment Referral Process Resourcing Drainage System Communication Drainage Communication Direction Communication/ Documentation with the Responsibility Education Community
Unstable Waterways in An improved Mt Martha Resources are referral system will Problem areas can required to Areas of waterway ensure that new be identified to regularly inspect degradation could developments is not council officers by waterways to be identified and located adjacent to field staff identify areas of regularly monitored unstable water degradation courses
Building Site Runoff in An improved Communication can referral system will Balcombe Creek and Mt Improved Resource capacity is be used to identify ensure that new Martha subdivision essential to enforce new building sites developments have Communication construction building site Recognition of and education to appropriate with the community Resolution of practices require management Stormwater identify good site conditions on the will raise the regional drainage support at a regulations and Management as a management permit regarding awareness of issues will allow regional level. local laws strategic issue of practices stormwater stormwater greater technical will allow greater management and and on-ground management technical and on- encourage the Runoff from Residential resources to be ground resources to Documentation of community to take areas within Mt Eliza, committed to solving The ability to be committed to Field staff can the drainage system their own actions to Nepean and Balcombe stormwater regularly inspect solving stormwater identify specific would allow reduce the impact pollution issues council assets and Creek subcatchments pollution issues areas where pollutants at the they have on
Stormwater Risk Issues identify potential stormwater outlets of systems to stormwater pollutant sources is pollution occurs be traced to their limited by resources source
Unsealed Roads throughout the Resources are required to Municipality The reporting of regularly inspect road conditions can roads and repair or be used to identify seal roads which problem areas generate high pollutant loads
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PRIORITY MANAGEMENT ISSUES 76 Table 9.3 Summary of Risk and Management Framework Linkages
Management Framework Issues Regional Interagency Strategic Intradepartment Referral Process Resourcing Drainage System Communication Drainage Communication Direction Communication/ Documentation with the Responsibility Education Community
Commercial areas within the Nepean Catchment The ability to Improved regularly inspect communications commercial areas with EPA will assist and identify in the development potential pollutant of solution sources is limited by resources Communication Recognition of with the community Resolution of An improved Waterway Degradation in Stormwater will raise the regional drainage referral system will Merricks Creek and Management as a awareness of issues will allow ensure that new Resources are Shoreham catchment strategic issue of Problem areas can Areas of waterway stormwater greater technical developments or required to will allow greater be identified to regularly inspect degradation could management and and on-ground changes in landuse technical and on- council officers by be identified and encourage the resources to be will implement waterways to ground resources to regularly monitored community to take committed to solving field staff effective stormwater identify areas of be committed to their own actions to stormwater management degradation solving stormwater reduce the impact pollution issues measures pollution issues they have on Stormwater Risk Issues Septic Tank Leakage in stormwater Merricks, Shoreham and Resources would Flinders allow septic systems to be regularly inspected and inadequate systems upgraded to reduce impacts
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 77
10 STORMWATER RISK MANAGEMENT STRATEGIES
Management strategies recommended as part of a SWMP generally contain a combination of one or more management option elements. Each of these elements work together to achieve the management objectives associated with the particular strategy. The multi-faceted nature of a stormwater management strategy is critical to its effectiveness, as management does not simply rely on one element.
The development of the SWMP for Mornington Peninsula Shire Council has involved the formulation and recommendation of 12 management strategies to manage the Stormwater Risk Issues identified in the previous chapter. This Chapter of the SWMP outlines the process associated with reviewing opportunities and selecting the most appropriate stormwater management elements for inclusion as part of strategies.
10.1 Stormwater Risk Management Strategy Formulation
The approach adopted in reviewing and selecting appropriate management elements to form management strategies is based on a staged process that identifies opportunities and selects the most appropriate elements. This process results in the formulation of strategies for priority risks and three key steps as follows: 1.Management Element Screening; 2.Management Element Opportunity Assessment; and 3.Strategy Formulation.
The key outcome from the process is the recommendation of a series of management strategies which respond to Stormwater Risk Issues, can be practically implemented and represent value for money in the achievement of Best Practice Environmental Management. Each of the three key steps applied in the formulation of management strategies is outlined in more detail as follows: · Management Element Screening – a range of generic management elements are initially screened to eliminate option elements that are considered unsuitable for the range of pollutants and land uses within the particular subcatchment. Option elements which are considered to have some merit for application are highlighted for further consideration as part of the opportunity assessment process; · Management Element Opportunity Assessment – management elements passing the screening process are considered in more detail regarding specific opportunities for their application. This process includes the identification of specific locations for structural elements, descriptions of the specific nature of non-structural measures (including programs and plans) and an approximate cost for each element. The information generated as part of this process is used to select and group elements into strategies to manage specific risks. In some instances, detailed assessment as part of this process may conclude that specific elements are not suitable, despite having passed the screening process.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 78
· Stormwater Risk Strategy Formulation – leading on from the previous step, each management element opportunity is assessed to consider its “value for money” and suitability as part of a management strategy. This involves the consideration of a series of criteria for each element related to effectiveness, capital and operational cost, perceived feasibility of implementation, multiple benefit opportunities and desirability (or sustainability). The methodology of this process is described in more detail in Section 10.4.
Whilst, management strategies are formulated to manage a specific issue, in some instances a particular management element may be effectively applied to the entire municipality. These elements are identified in Chapter 12 which examines implementation issues.
Figure 10.4 provides a schematic example of how the three step process is applied to develop Stormwater Risk Management Strategies.
Management Management Management Element Screening Element Strategy Opportunity Formulation Assessment Gross Pollutant Traps Artificial Wetlands Targeted Guidelines Gross Pollutant Traps Gross Pollutant Traps 1. Brown Street Drain 1. Brown Street Drain - 2. Smith Street Drain - 3. Jones Street Outlet 3. Jones Street Outlet - Trash Racks Trash Racks Trash Racks 1. Outlet Near Shops 1. Outlet Near Shops Education Literature 2. Brown Street Outlet - 3. Main Drain Outlet - Community Awareness Community Awareness - Brochure Brochure - - - Street Sweeping - - Local Law (Fines) Modify Street Community Group Liaison Sweeping Modify Refuse Collection Regular Workshops Regular Workshops
Figure 10.1 Three Step Stormwater Risk Management Strategy Formulation
10.2 Management Element Screening
10.2.1 Generic Management Element Descriptions
As part of the management element review process a range of generic management element types are assessed (screened). These elements include a selection of both structural and non-structural actions that can be applied as part of a stormwater management strategy. They are divided into seven categories as follows: · Education and Awareness Programs; · Source controls; · Site specific strategies and plans; · Non-structural treatments;
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 79
· Structural treatments; · Information and data collection; and · Regulation and enforcement.
The management elements defined within each category specifically relate to actions that Council can apply to manage stormwater. Table 10.1 provides a summary of the generic strategy elements in each category along with a description of the elements and their treatment capabilities.
10.2.2 Management Element Screening Results
The management element screening process considers the range of management elements for each of the Stormwater Risk Issues. The objective of this stage of the process is to eliminate elements, which are: · not suited to treating the key stormwater threats identified associated with the risk group; or · not applicable to the subcatchment or situation being considered due to obvious limitations or constraints.
At the end of the Management Element Screening elements considered to have merit are assessed regarding specific opportunities for their application. The final decision regarding the rejection of elements as part of the screening process is based on the study team’s experience, knowledge of the subcatchment and feedback provided by members of the Project Working Group.
Details of the screening process applied for each of the 12 Stormwater Risk Issues are presented in Appendix E of Volume III. A summary of the management elements considered to have merit for opportunity assessment, i.e. those not screened out, is presented in Table 10.2.
The following presents a brief summary of each management strategy. The aim is to outline how each strategy is intended to respond to the Stormwater Risk Issue, why specific elements were selected and why some elements were not included.
Strategy 1 – The aim of this strategy is to reduce the impact of intensive agricultural activities within the Watsons Creek subcatchment on the Local and Regional receiving environments in Westernport. To mitigate the threat it will be necessary to reduce the export of nutrients, sediments and pathogens from the catchment. It would be expected that many of the strategy elements would be related to improving farming practices and improving the health of the catchments waterways. There a number of programs in place aimed at improving the environmental management of market garden areas. Plans that are currently in place include the Watsons Creek Action Plan, Westernport Action+ Program and a number of activities supported by the Vegetable Growers Association and industry. The aim of this strategy is to integrate the outcomes of the stormwater management program with these existing strategies while avoiding the replication of existing programs.
Strategy 2 – The aim of the management strategy is to reduce the impact of septic tank systems on the groundwater resources within the Nepean Peninsula. The range of solutions available to mitigate the threat are limited and in the case of the most desirable solution, connection of each property to sewer is expensive. Options have been selected to ensure septic systems are adequately managed and the community is made aware of their role in the management of the issue. Given the nature of the
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 80
threat and the value conventional structural and non-structural stormwater management measures are not appropriate.
Strategy 3 – In order to reduce the impact of residential development on stormwater it is necessary to reduce the volume of sediments and attached nutrients exported from construction sites. The management strategy will be based on education and awareness programs in conjunction with a number of other site-specific elements and a regulation and enforcement program. On the whole, few structural measures have been recommended, as many are inappropriate for the pollutant type or should be included as part site-specific strategies implemented by developers. It was not believed that the construction of large regional structural measures were appropriate, as the pollution should be managed as near to source as possible.
Strategy 4 – This stormwater management issue is similar to Strategy 1 as it requires the management of stormwater runoff from market gardens within the Chinamans Creek subcatchment. A range of elements have been selected to raise the awareness of the issues with the farming community and educate them about good practice, undertake a range of on ground works to improve the condition of waterways and runoff quality within the catchment and gather data to better understand the issue. Several of the strategies are relatively low cost as they involve the adoption of educative material or demonstration sites, developed as part of the Watsons Creek strategy, or are funding the completion of an existing program. The artificial wetland is a very high cost item, due to the size of the facility to be constructed and maintained.
Strategy 5 – Significant waterway degradation within Hearn Creek was identified as part of the Due Diligence study and it is expected to be generating sediment loads that are impacting on the Local Receiving Environment. Due to the highly localised nature of the threat only two management elements have been recommended. The first element is a waterway rehabilitation project to undertake works within Hearn Creek to remediate the sites identified within the Due Diligence Study. The second element is the establishment of a regular monitoring program of waterways draining from Mt Martha in order to identify erosion points in the future and allow them to be stabilised before they develop further.
Strategy 6 – Throughout the municipality building works are generating significant pollutant loads that are entering the stormwater system. The pollutants are being generated by poor sediment and erosion control practices and poor waste management. A number of elements were selected for further consideration and include programs to liaise with builders to encourage them to improve their site management practices, lobbying of a number of agencies and industry groups to improve the legislation that is used to regulate building sites and an audit and inspection program to improve the practices of builders. Media releases via the existing Shire newsletter and local papers were identified as being a good opportunity to raise the awareness of the issue amongst the local community. A range of structural measures to capture pollutants at a number of points within the drainage system was also identified for further consideration. The costs for the gross pollutants traps and release nets were based on the cost for an individual unit and their cost effectiveness was estimated for a typical catchment.
Strategy 7 – The municipality contains large areas of established residential development, which are having a cumulative impact on receiving environments, particularly Port Phillip. The spatial extent of the threat makes it difficult to target, as few elements will be cost effective. It is believed that the only method of reducing the threat posed by residential areas is the development of programs aimed
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 81
at changing the public’s perception of the impact of stormwater pollution and providing education material to encourage the public to reduce the pollutant load generated. It is proposed that these objectives would be addressed by using the local media to raise the awareness of the issue and offer advice to reduce the generation of pollutants, use signage to highlight the impacts of residential landuses on waterways and encourage and support the existing community groups.
Strategy 8 – Unsealed road runoff throughout the municipality was identified as a significant issue by the Project Working Group. However, very little data is available to quantify the impacts of specific roads on their local receiving environment and the Councillors have expressed a view that the sealing of further roads throughout the municipality should be limited to maintain the local character of several townships. Based on these issues management elements were selected to raise the knowledge of unsealed road maintenance practices with council officers, educate the councillors regarding the impacts of unsealed roads on receiving environments and undertake a study to quantify the condition of all unsealed roads throughout the municipality to allow more detailed management priorities to be set.
Strategy 9 – This strategy is intended to minimise the occurrence of septic overflows to Dodds Creek in the Flinders Township. The range of management elements selected reflects the well-defined area of the threat and its impacts. Management elements have been selected to allow the source of the threat to be better defined and the septic tank systems that are not meeting performance requirements be upgraded. The strategy also includes elements that require council to lobby State Government to construct reticulated sewers throughout the town and along the Westernport coast. Communication with and education of the community is recognised as being a key element of the solution to problems and several elements have been selected to facilitate the education process. This strategy will make use of many of the elements to be implemented as part of Strategy 2 which is managing a similar threat in the Nepean subcatchment.
Strategy 10 – The commercial areas within the Nepean subcatchment have been identified as posing a threat to the Local Receiving Environment. The management strategy will target key pollutants such as litter and waste from the commercial premises and their surrounds, with the intention of trapping as close to their source as possible. The selected Education and Awareness elements include the distribution of Wastewise literature to commercial premises, regular contact between EPA, council officers and the commercial operators, media release to the general public and signage. The use of gross pollutant traps and release net devices is also proposed.
Strategy 11- Waterway degradation within the Merricks Creek and Shoreham subcatchments was identified as a threat to the instream habitats of both waterways. Waterways within both catchments are generally degraded, with a number of sites identified within the Due Diligence study as requiring remedial works. In addition to the isolated areas of severe water degradation there is a significant amount of degradation throughout both catchments due to past and current land management and agricultural practices. In order to reduce the risk of further degradation of the waterways it is proposed to undertake activities with the private landholders within the catchment to improve the management of streams and riparian areas. The elements that are likely to be adopted include liaison with the Landcare groups, demonstration projects and financial incentives to farmers to fence and revegetate their stream frontages. The development of a waterway management strategy and regular monitoring has also been selected for further investigation, as they will give a strategic focus to future works.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 82
Strategy 12 – This strategy is concerned with minimising the risk posed by septic systems in the Merricks Creek and Shoreham catchments and is similar in composition to Strategy 8 but over a significantly larger area. As such potential strategy elements have a broader scale, with several directed towards firstly identifying the sources of pollution.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 83
Table 10.1 Management Element Descriptions
Treatment Capabilities (where relevant) Strategy Element Description
Type
Fine Sediment Litter Deoxygenating Coarse Sediment Toxicants Pathogens Nutrients Oils and Grease Flow Retention Materials Literature/Guideline Development and Targeted literature or guidelines providing stormwater management guidance for specific activities or landuses, as * * * * * * * * * Distribution
well as general education material. Stormwater Management Education Focussed workshops to small groups of no more than 20 to 30 people. Aimed at encouraging participation and * * * * * * * * * Workshops active involvement in management. Demonstration Projects Pilot projects which demonstrate management techniques relevant to managing stormwater. * * * * * * * * * Individual/Organisation Consultation One on one consultation with specific organisations or individuals. * * * * * * * * * Media Release Publication of stormwater management initiatives or education material using radio, printed media or television. * * * * * * * * * Signage Signs indicating the function of the drainage system, stormwater flows and pollutant sources, or interactions * * * * * * * * * between stormwater management and receiving environmental values. Landcare, Community & Special Consultation with specific groups of people who gather as part of other forums such as land care, rate payers * * * * * * * * * Interest Group Consultation
Education and Awareness associations or “environmental interest” groups. Business Stakeholder Groups & Formation of targeted committees regarding stormwater or environmental management. Committee participants * * * * * * * * * Committees will usually need to see the benefit of these groups in terms of financial gains through better management. Street Sweeping Collection of sediments and litter from streets and pavements using a purpose built sweeping or suction unit. The
effectiveness of street sweeping has been debated at length with many believing it to be ineffective unless 4 4 4 4 performed daily. Waste & Refuse Collection Regular collection of domestic or industrial refuse and waste to avoid refuse from becoming available to pollute * * * * * * * * * stormwater. Collection of domestic refuse typically occurs as part of many standard Council operations. Waterway Rehabilitation & Works associated with bank stabilisation and replanting aimed at rehabilitating the natural function of the * * * * * * * * * Revegetation waterway. Source Controls Roof Water Diversion Diversion of roof water directly to stormwater drainage system away from general site runoff in order to reduce * * * * * * * * * the volume of runoff that is routed through treatment devices. It should be noted that an indication of treatment capabilities has not been provided for elements in the categories of Education and Awareness, Site Specific Strategies and Plans, Information and Data Collection, Regulation and Enforcement and some Source Control Elements. Implementation of elements in these categories is likely to lead to a reduction in all of the pollutant types indicated. However, specific measurement of performance is difficult.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 84
Table 10.1 Management Element Descriptions
Treatment Capabilities (where relevant) Strategy Element Description
Type
Fine Sediment Litter Deoxygenating Coarse Sediment Toxicants Pathogens Nutrients Oils and Grease Flow Retention Materials Site Specific SWMP's Focussed Stormwater Management Plans for a specific site or operation. These are developed at a localised level * * * * * * * * * to deal with locally specific management issues. Site Specific Sed & Erosion Control Focussed sediment and erosion control plans for individual sites which provide designs for minimising erosion of
Plans material and entrainment of sediments in stormwater. These are typically designed prior to the earthworks * * * * * * * * * construction activities as part of a development. Waste Management Program Waste Management Programs provide a coordinated plan for managing waste to achieve specific environmental Development outcomes at either a local or regional level. They tie together a range of specific actions which can include refuse * * * * * * * * * collection, education and awareness and legislation. Water Quality Management Strategy A targeted strategy or plan which provides guidelines for managing open water bodies. The strategy should identify simple monitoring procedures and provide response plans for mitigating poor water quality or public health issues such as blue green algal blooms. Poor water quality in recreation lakes or landscape features can * * * * * * * * * contribute pollutant sources to the stormwater system. In addition, their effective management can provide a means for removing pollutants from stormwater. Waterway Management Strategy Waterway Management Strategies provide a coordinated plan for the management of waterways to achieve Development multiple outcomes in relation to ecological, recreational and hydraulic amenity. Any proposed works associated * * * * * * * * * Site Specific Strategies and Plans with revegetation or rehabilitation should be coordinated as part of a Waterway Management Strategy. Spill Prevention and Containment Specific plans for locations which experience a high risk for accidental spillage and contamination of stormwater Plans or discharge to the drainage system. These plans identify potential sources, risks, indicators and response * * * * * * * * * activities. Swales Small, grass lined open channels which act to slow flows and filter runoff. Sometimes used in lieu of kerb and 4 4 4 4 4 channel
Pourous Pavements Pavements constructed with high porosity to promote infiltration. 4 4 4 4 Rainwater Storage and Reuse Domestic tanks which permanently or temporarily store rainwater for reuse or to retard flows. 4 (Tanks) Structural - Stormwater Infiltration Measures These include measures such as infiltration basins and soakage trenches which promote infiltration to recharge 4 4 4 4 4 4 Treatments shallow aquifers. Usually constructed with course aggregate over lain by top soils. Non Filter Strips Densely vegetated strips aligned across the direction of flow to filter runoff. Primarily used for filtering runoff as 4 4 4 4 4 sheet flow. It should be noted that an indication of treatment capabilities has not been provided for elements in the categories of Education and Awareness, Site Specific Strategies and Plans, Information and Data Collection, Regulation and Enforcement and some Source Control Elements. Implementation of elements in these categories is likely to lead to a reduction in all of the pollutant types indicated. However, specific measurement of performance is difficult.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 85
Table 10.1 Management Element Descriptions
Treatment Capabilities (where relevant) Strategy Element Description
Type ting
Fine Sediment Litter Deoxygena Coarse Sediment Toxicants Pathogens Nutrients Oils and Grease Flow Retention Materials Screening Devices These can vary from crude grates to net devices which fit over drainage outlets. They target coarse pollutants. 4 4 Artificial Wetlands Permanent open water bodies which facilitate biological and physical pollutant removal. They have intermittent 4 4 4 4 4 4 4 4 4 deep and shallow water areas with aquatic and semi-aquatic vegetation.
Gross Pollutant Traps Minor in-line (underground) or major (above ground) structures which target litter and large particulates. They usually have some permanent water to promote settling with grates for trapping litter. These can also be fitted to 4 4 4 4 4 4 remove oils, grease and other floating scum. Drainage Inlet Traps Traps which are integrated within existing drainage inlets. These are like small GPT’s in side entry pits. These 4 4 4 4 can also be fitted to remove oils, grease and other floating scum. Sedimentation Basins Large open water bodies which promote pollutant removal via physical settling. 4 4 4 Floating Debris & Litter Booms Floating plastic tubes which are aligned to catch floating pollutants and slicks from the water surface. 4 4
Structural Treatments Oil and Grease Interceptors Sump pits located within underground drainage systems that include baffles to trap oils and scum from the water surface. These usually operate best in low flow environments which receive frequent minor runoff, such as wash 4 down bays. Flow Detention Structures (Basins) Open structures which are designed to temporarily store flows and release them slowly, reducing peak discharges. 4
Litter Audits Informal visual inspections of waterways which record the volume of litter at key locations. These provide valuable information on gross pollutants which can be easily used to identify the impacts on receiving waters * * * * * * * * * values such as visual amenity. Monitoring (Stormwater, Instream Focused monitoring strategies which involve the rigorous collection of water quality data, biological data (eg. Ecology, Flow) benthos, fauna numbers and distribution) and hydraulic characteristics. This information can be used to define * * * * * * * * * long term trends relating to seasonal characteristics or ongoing impacts. Good quality data can significantly Information & Data Collection increase the ability to focus management strategies. Financial Incentives These are direct monetary incentives to land holders to participate in stormwater management activities. This * * * * * * * * *
may include rate rebates for land holders who actively participate in stormwater management on their property. Audit and Inspection This relates to random audits and inspection by Council and other regulatory staff to identify non-compliance with specific standards. This can include environmental audits, audits for compliance with sediment and erosion * * * * * * * * * control requirements and compliance with waste management requirements. Infringement Notification and Fines Reactive responses to non-compliance which involve the formal notification or mandatory fines. These types of Enforcement Regulation & approaches are usually seen as a last resort. In addition, many local authorities are not adequately equipped to * * * * * * * * * serve such notifications or fines. It should be noted that an indication of treatment capabilities has not been provided for elements in the categories of Education and Awareness, Site Specific Strategies and Plans, Information and Data Collection, Regulation and Enforcement and some Source Control Elements. Implementation of elements in these categories is likely to lead to a reduction in all of the pollutant types indicated. However, specific measurement of performance is difficult.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 86
Table 10.2 Summary of Possible Management Elements (Element Screening Results)
Element Type Strategy Elements Strategy 1 Strategy 2 Strategy 3 Strategy 4 Strategy 5 Strategy 6 Strategy 7 Strategy 8 Strategy 9 Strategy 10 Strategy 11 Strategy 12
Literature/Guideline Development and Distribution 4 4 4 4 4 4 4 4 Stormwater Management Education Workshops 4 4 Demonstration Projects 4 4 4 Long Term Individual/Organisation Consultation 4 4 4 4 4 4 4 4 4 Media Release 4 4 4 4 4 4 4 Signage 4 4 4 4 4 4 Landcare, Community & Special Interest Group 4 4 4 4 4 4
Education and Awareness Business Stakeholder Groups & Committees 4 4
Street Sweeping Waste & Refuse Collection Waterway Rehabilitation & Revegetation Source 4 4 4 4 Controls Roof Water Diversion
Develop & Impliment Site Specific EMP's 4 4 4 4 Develop & Implement Site Specific Sed & Erosion Control Plans 4 Waste Management Program Development Water Quality Management Strategy 4 4 4 Site Specific Waterway Management Strategy Development 4 4 Strategies and Plans Spill Prevention and Containment Plans Swales
Pourous Pavements Rainwater Storage and Reuse (Tanks) Structural - Stormwater Infiltration Measures Treatments
Non Filter Strips Screening Devices 4 4
Artificial Wetlands 4 Gross Pollutant Traps 4 4 Drainage Inlet Traps Sedimentation Basins Instream Floating Debris & Litter Booms 4
Structural Treatments Oil and Grease Interceptors Flow Detention Structures (Basins) Information & Litter Audits Data Monitoring (Stormwater, Instream Ecology, Flow) Collection 4 4 4 4 4 4 Financial Incentives (eg. Rate Rebates) 4 4 4 4 4 Regulation and Enforcement Audit and Inspection 4 4 4 4 4 4 Infringement Notification and Fines 4 4 4 4
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 87
10.3 Management Element Opportunity Assessment
Option elements which have been identified as potentially suitable via the screening process are considered in more detail (in this Chapter) regarding specific opportunities for their application. In this regard, this Chapter provides details of opportunities for the specific application of option elements with respect to each of the 10 Priority Risk Groups for which strategies have been developed. These details include: · Element Number – this is an identification number assigned to each specific management opportunity. The number contains abbreviations describing the Management Strategy (eg. MS1 = Management Strategy 1), type of management element (eg. EA = Education and Awareness) and an identification number. · Element Type – this describes the element type in terms of the generic element types presented in Table 10.1 · Management Opportunity – a description of how the particular management type can be applied. · Location and Description – a description of the specific nature of the management element application including specific locations are activities involved in its application. · Approximate Cost (Capital & Ongoing)– cost estimates have been provided for specific elements based on indicative unit rates for structural elements and estimates of consulting fees associated with the development of education and awareness elements, source controls, plans and strategies and regulation and enforcement elements. Cost estimates for ongoing maintenance are also provided on a per annum basis. These costs (ie. operational) have either been calculated based on typical clean out rates, taken from information provided by suppliers or estimated from information provided in the Best Practice Environmental Management Guidelines. The costs reflect the total cost of implementing each element, the likely cost to council will be identified following the economic assessment of each strategy. · Extent of Application – this indicates whether the element is suited specifically for application to the particular subcatchment being considered or whether it may be suited for wider application across other subcatchments. Elements which are only considered to be applicable within the subcatchment are attributed with the term Local. More information is provided for elements which are considered to have broader applicability.
In many cases the cost of an element has been estimated assuming much of the work required, e.g. the development of education material, will be undertaken by other agencies and provided to the Shire, who will be responsible for converting it to a council document and printing. If the material to be developed by others is not available and have to be developed when required by the Shire, the costs would be expected to rise significantly.
The final outcome of this stage of this assessment is a list of specific management element opportunities which could be combined to form management strategies. Section 10.4 provides details of how these option elements are further assessed and combined to formulated stormwater management strategies. Tables 10.5 to 10.15 summarise specific management element opportunities which have been identified to mitigate each of the Priority Risk Groups.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 88 Table 10.3 Stormwater Risk Issue 1, Management Element Opportunities Subcatchment: Watsons Creek Threat: Agricultural Runoff Values: Local Receiving Environment
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application MPSC should take a lead in the co-ordination of stakeholders throughout the catchment. Actions of the This program will also have regional benefits as Long Term Organisational large number of agencies and stakeholders should be MS1-EA-01 Co-ordination of stakeholders $10,000 Local all parties have wider interests than Watsons Consultation co-ordinated and their outcomes uniformly reported. It Creek. is expected that this role would be undertaken by the council officer already appointed to the project. MPSC presently funds a number of community Landcare, Community & MS1-EA-02 Fund Community Groups groups. It is suggested that the support is continued, as $5,000 Local Special Interest Groups it is an important means of engaging the community. It is expected that a large number of sites will be identified within the Waterway Strategy. Many of the sites will be adjacent to private land and it will be necessary negotiate with landholders prior to Dependent on Waterway Rehabilitation undertaking works. The location and scale of works Waterway MS1-SC-01 Stream frontage protection works Local and Revegetation will not be fully defined until the Waterway Strategy Management Strategy is complete. The funding Outcomes allocated reflects the ongoing commitment that would be required to support a waterway rehabilitation program. MPSC, MW, EPA and other agencies and stakeholders should develop a water quality management strategy To be successful the Water Quality Management for the catchment. This action is identified in the Strategy will need to engage all stakeholders in its revised SEPP (F8). MW is identified in the SEPP as Development of a Water Quality preparation. A significant component of the Water Quality having responsibility for the project and it would be MS1-SS-01 Management Strategy for the $40,000 $5,000 Local project is likely to be the education of Management Strategy expected that the Shire would be a major stakeholder. Watsons Creek catchment stakeholders and the assignment of This program will be a key management tool for the responsibilities for water quality impacts and catchment and would be expected to identify pollutant actions. sources, impacts and measures to improve water quality. A Waterway Management Strategy is required which specifically focuses on management of the Creek and Melbourne Water are proposing to develop this Waterway Management Develop a Waterway Management drainage line corridors. The management strategy waterway activity plan using in-house resources. MS1-SS-02 $60,000 Local Strategy Development Strategy for Watsons Creek should consider revegetation requirements (buffer (consulting fees) It is expected that the project will be initiated and planting), water quality management (eg. stormwater completed during 2001 inflow locations) and stabilisation of over-banks. The surface water monitoring program is currently in place and supported by Melbourne A regular monitoring program should be implemented Regular monitoring of surface and Water as part of their Healthy Waterways Ms1-DC-01 Monitoring to monitor levels of nutrients, pathogens and $40,000 Local groundwaters program. The responsible resource manager for suspended solids. the groundwater aquifer should be responsible for its monitoring.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 89 Table 10.4 Stormwater Risk Issue 2, Management Element Opportunities Subcatchment: Nepean and Chinamans Creek Threat: Septic Tank Systems Values: Groundwater
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application Development or adoption of material to educate property owners regarding septic systems, their Although local in application many areas within Literature & Guideline Educational material for property MS2-EA-01 management and the impact they are having on the $15,000 $5,000 Local the state suffer similar problems and it therefore Development owners environment. Distribution should include each may be appropriate to seek assistance from EPA property within Shire This strategy along with MS2-SS-01 will help to Lobby EPA for funding for Shire officers should continue to lobby the EPA to clearly define actions to manage wastewater. MS2-EA-02 Municipal Waste Water Management provide funding for a Waste Water management $5,000 Shire This action is also part of the Draft Western port Strategy Strategy for the municipality SEPP (F8) This strategy will be the most effective in Long Term Consultation reducing the impact of the threat of the MPSC should take an active role in advocating for the groundwater. However, this strategy will require Lobby State Government to fund MS2-EA-03 reticulation of sewers across the municipality and in $5,000 Shire a large financial and political commitment from construction of reticulated sewers particular within the Nepean Peninsula State Government and from local residents who may not want to pay to connect or may not perceive that there is a problem. It is unlikely that this strategy will have a The Shire newsletter, Peninsula Way, and other local significant direct impact on levels of pollution, Use regular media outlets to highlight media outlets could be used to alert the public to the but it is an important step in the education of the MS2-EA-04 Media Release $7,500 Shire septic tank management and impacts problem and make a series of suggestions to property public regarding this issue. It would be expected owners regarding the management of septic systems. that a larger education program will be required if reticulated sewerage is to occur in the future. The placement of signs, or augmentation of existing Place signs adjacent to open water signs, adjacent to open water bodies will allow the MS2-EA-05 Signage $5,000 $1,000 Local bodies declining water quality of the groundwater aquifer to be highlighted and linked to septic systems. Groundwater management plan will provide a strategic direction for ground water management Water Quality Implement Groundwater Finalise and implement the groundwater management MS2-SS-04 $20,000 $10,000 Local within the municipality. Key issues to be Management Strategy Management Strategy plan under development by the EPA resolved include the identification of a resource manager. The collection of data will provide a tool for the The groundwater table should be regularly monitored long term management of the resource. Southern Monitor condition of Groundwater MS2-DC-01 Monitoring to determine it’s the level and concentration of a range $20,000 Local Rural Water should be responsible for Table of pollutants groundwater monitoring. Costs based on monitoring 6 bores quarterly. The Shire and other agencies responsible for It is assumed that approx 50% of properties will Funding or loans to improve the wastewater and groundwater management should not be compliant and it will cost $3000 to MS2-RE-01 Financial Incentives condition and operation of septics investigate the opportunities to fund the improvement $150,000 Local upgrade or maintain each system. This program within the municipality and upgrading of septic systems to ensure that they is reliant on there being sufficient legislation to meet with current best practice. implement strategy MS2-RE-03 successfully.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 90 Table 10.4 Stormwater Risk Issue 2, Management Element Opportunities (continued) Subcatchment: Nepean and Chinamans Creek Threat: Septic Tank Systems Values: Groundwater
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application Funding the connection of properties to the reticulated It is assumed that approx 1000 properties will not Funding or loans to subsidise the MS2-RE-02 Financial Incentives sewer where a sewer exists and properties have septic $3,000,000 Local be connected and it will cost $3000 to connect connection of houses to sewer system each property. Legislation does not exist that requires property MPSC to initiate a program to inspect septic systems owners with non-conforming septic system to Inspect septic systems to ensure they on residential properties to ensure that they comply upgrade or maintain systems. It is dependent on MS2-RE-03 comply with relevant codes of $200,000 Local with relevant design guidelines and are operating original permit conditions. The costs associated practice and permits. Audit & Inspection correctly. with this program are based approx. 1000 properties to be inspected at $200 per inspection. South East Water should be able to supply rating Identify Properties which should be Inspect South East Waters rating records to identify MS2-RE-04 $5,000 Local data to identify properties that should be connected to Sewer which properties are not connected to available sewers. connected. This program is planned
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 91 Table 10.5 Stormwater Risk Issue 3, Management Element Opportunities Subcatchment: Balcombe Creek, Hastings Township & Kings Creek, Mt Martha Threat: Residential Development Values: Local and Regional Receiving Environments
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application It is expected that this material could be Develop educational material for construction site developed by a regional agency such as, MW, Literature and Guideline management that is relevant to small scale (< 50 lot) EPA DOI or MAV and distributed by the Shire. Development of brochures for MS3-EA-01 Development and developments. The document should be concise, $5,000 Regional The material for the document is available in a Developers and Contractors Distribution outlining the issue, methods to reduce impacts and the range of EPA documents and the Urban role of local government in enforcing compliance. Stormwater BMPEG. Costs are associated with document preparation and printing. An important opportunity to initiate the program. Run a half day seminar with invited representative The success of this element will be determined by from major developers who are active in the the number of people that attend the workshop. Stormwater Education Education Workshops for Developers municipality. Introduce the Stormwater Management MS3-EA-02 $10,000 Regional Costs reflect workshop facilitation ($5,000), Workshops and Contractors Plan and outline Council’s new initiatives, catering\venue ($2,000) and promotion ($3,000). commitments and expectations regarding stormwater management. It is expected that MPSC may need to share some of the costs to get the program up and running. But would obtain a significant amount of benefit MPSC should endeavour to create a partnership on a from the project as an education tool. The cost Partner with a developer or contractor site within the municipality to implement a range of may be offset by allowing the developer a MS3-EA-03 Demonstration Projects to use a development site as an sediment and erosion control measures. The site $20,000 Regional reduction in development contributions. example of best practice would be used as a teaching tool for other developers Maintenance costs would be the responsibility of and contractors. the developer. Costs based on $1000 per lot for the life of the project and the use of 20 lot subdivision. Cost could be expected to vary by up to 50% depending on site conditions. Construction site issues require a regional focus and This is long term strategy and MPSC may look to Long Term Individual and Liaison with Agencies regarding MS3-EA-04 MPSC should lobby DOI, EPA and MBAV to develop $5,000 Regional an industry body such as MAV to undertake Organisational changing Laws Consultation uniform state laws, model local laws and guidelines. lobbying MS3-EA-05 Media Release Use local media to educate public Use the Shire newsletter, Peninsula Way, and other $7,500 Shire Costs reflect work required to develop several local media outlets to raise the awareness articles using material developed by others. Signs should be place adjacent to environmental assets Several strategies require signs and it may be that are being threatened by development activities to appropriate to combine requirements. Use signs as part of general MS3-EA-06 Signage highlight the impacts and cause. Signs should also be $5,000 $500 Local community education program erected adjacent to any demonstration sites to highlight what works are being undertaken. As part of general extension activities to development The group would be established as part of the industry it may be appropriate to establish a forum or Stormwater Education Workshops. Following use an existing forum to communicate with developers the workshop quarterly meeting would be held. Business Stakeholder Establish regular communication on the Peninsula regarding SW issues. The Peninsula $3,000 Shire MS3-EA-07 Groups and Committees with developers regarding SW Issues is likely to require its own forum as many industry forums are Melbourne based and locals may not travel to them.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 92 Table 10.6 Stormwater Risk Issue 3, Management Element Opportunities Subcatchment: Balcombe Creek, Hastings Township & Kings Creek, Mt Martha Threat: Residential Development Values: Local and Regional Receiving Environments
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application Environmental Management Plans identify potential This action may prove to be difficult to impacts of development, management actions for implement as many sites within the municipality minimising impacts and processes for monitoring have existing development permits and it will be impacts during development. A Sediment and Erosion difficult to impose new conditions on their Develop and Implement Require Environmental Management Control Plan would be a subset of an EMP. EMP permits. The relatively small scale of MS3-SS-01 $40,000 Shire Site Specific EMP’s Plans for Major Developments should only be required where a development is likely development on the Peninsula also limits the to have a major impact on the receiving environment. number of sites that will be of sufficient size to Plans should consider flora, fauna, geomorphology, require an EMP. Costs reflect the indicative price stormwater, flooding, air and noise, and site for a large development site. contamination (where relevant). As above, implementation may be hampered by For all development applications Council should existing permits. require development of a detailed sediment and erosion control plan. Plan should identify construction staging, control measures, monitoring regime (eg. Site Specific Sediment and Require sediment and erosion control MS3-SS-02 visual inspection) and responsible individual (eg. site $10,000 Local Erosion Control Plans plan for all new developments foreman). Plans should be in accordance with Council specifications (as per RG2-EA-01) and BPEM Guidelines. For major sites this should form part of an EMP. Many of the developers within the municipality Council could require developers to lodge a substantial are small and may not have the resources to fund bond as a condition of development approval. The bonds. The costs reflect initial costs associated Bond system for subdivision bond would be released in full on completion of the MS3-RE-01 Financial Incentives $200,000 $100,000 Shire with establishing the system and its ongoing development. project, successful hand over of maintenance aspects to administration. Council and compliance with the EMP or Sediment and Erosion Control Plan submitted. This program would be benefited by the Council to appoint an additional staff member to be development and implementation of state MS3-RE-02 Increase inspection of residential involved in inspection of residential developments and Shire Audit and Inspection developments by Council Officers. $100,000 legislation relating to the management of compliance with proposed management practices. construction sites. This program is a small but important element of the strategy to control subdivisional pollution as it Develop a similar infringement system to the building provides a means of punishing repeat offenders. site waste program for subdivision sites. Infringement Infringement Notification Develop a series of infringement It should not be used until a number of proactive MS3-RE-03 notices would be issued to developers or contractors $200,000 $50,000 Shire and Fines measures for developers approaches have been made. Costs are associated that fail to adequately construct and maintain sediment with establishing local laws to deal with the issue and erosion control measures. and its administration, including a part time officer.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 93 Table 10.7 Stormwater Risk Issue 4, Management Element Opportunities Subcatchment: Chinamans Creek Threat: Market Gardens Values: Local and Regional Receiving Environments
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application As part of the Watsons Creek Action Plan a series of Material will be adapted from other programs and education tools will be developed, these tools will be distributed via extension activities. Literature/Guideline Use material developed for Watsons applicable to the Chinamans Creek market garden MS4-EA-01 Development and Creek catchment and distribute to $2,000 Local areas. The shire will be able to distribute the Distribution farmers guidelines through extension activities undertaken in program Several demonstration sites are proposed as part of the This program has benefits in that it could be Watsons Creek Action Program. Rather than develop promoted as an opportunity for farmers to look at Use the demonstration sites new sites it would be better to use the existing program a range of farming and environmental practices. MS4-EA-02 Demonstration Programs developed as part of the Watsons $5000 Local and run tours through the sites. The extension The costs associated with this program reflect 4 Creek Action Program activities proposed in MS4-EA-03 to be used to annual trips. identify participants Use long term extension activities to build links with Key partners in this program could include VGA market gardeners. The position would require an input and purchasers of produce. of 1 or 2 days a month to maintain regular contact with Long Term Individual Develop relationships with market the landholders. It may be worthwhile for MPSC to MS4-EA-03 $10,000 $10,000 Local Consultation gardeners within catchment partner with another agency or group to combine the environmental objectives with an agronomy program. Alternatively the position could be incorporated into another Shire program related to the environment. The Draft Chinamans Creek Strategy identifies a The costs reflect a ongoing cost to fence and Fencing and Revegetation of sections number of sites where waterways could be fenced. revegetate approximately 1000 metres of stream MS4-SC-01 Waterway Rehabilitation $10,000 Local of waterway Where works fall within private property MPSC will per annum. have to negotiate with owners to implement works. The EMP should consider all aspects of water, nutrient The costs reflect the cost to a farmer to develop a and soil management on market garden sites. The single EMP. Ongoing costs reflect council costs Develop Site Specific Develop EMP’s for large market MS4-SS-01 successful implementation of an EMP should have $10,000 $2,000 Local to audit and monitor EMP performance. EMP’s gardens benefits for the environment and economics through improved productivity. The Chinamans Creek Catchment Strategy contains a Costs associated with study completion, report detailed analysis of the catchment and makes a series production an distribution. of management recommendations. The document Water Quality Finalise Chinamans Creek Catchment should be updated to reflect current issues, in particular MS4-SS-02 $5,000 Local Management Strategy Strategy the market garden issues, and adopted by council. This strategy will integrate with the Water Quality Management Strategy (MS2-SS-04) proposed for the Nepean Peninsula. The construction of a wetland requires the swamp to 14 ha of wetland area required at a cost of Construct an artificial wetland MS4-SS-01 Artificial Wetlands be purchased from the current private landholders and $7,000,000 $700,000 Local $50/m2. This cost does not include purchase cost upstream of the Tootgarook Swamp an area upstream used to construct an artificial wetland of land if private property is required.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 94 Table 10.7 Stormwater Risk Issue 4, Management Element Opportunities Subcatchment: Chinamans Creek Threat: Market Gardens Values: Local and Regional Receiving Environments
Approximate Cost Element Management Action Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application
MS4-DC-01 Groundwater Monitoring Proposed as part of Management Strategy 2 $20,000 Local Regularly sample surface waters within the catchment This program should be the responsibility of the Monitoring to determine, flows levels of nutrients and pathogens. regional drainage authority, EPA and SRW. MS4-DC-02 Surface Water Monitoring The monitoring program should be integrated with the $10,000 $20,000 Local Costs are associated with the establishment of a groundwater monitoring program to enable a picture of gauging station and an ongoing monitoring the water cycle in the catchment. program.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 95 Table 10.8 Stormwater Risk Issue 5, Management Element Opportunities Subcatchment: Mt Martha Threat: Waterway Degradation Values: In-stream Habitat
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application 3 sites have been identified within the Hearn Creek These waterways are identified in the Due Undertake stream stabilisation works Catchment where stabilisation works are required. Diligence Study as being regional assets and MS5-SC-01 Waterway Rehabilitation identified in Hearn Creek as part Due The works are primarily engineering works to stabilise $150,000 $5,000 Local works may therefore be delayed as regional Diligence Study creek beds although follow up revegetation programs drainage responsibilities are assigned. will help improve the amenity offered by the creek. The aim of the inspection program is to regularly The waterway monitoring could also gather Regular inspections of the waterways identify the areas where erosion is occurring and to MS5-DC-01 Data Collection $5,000 Subcatchment information regarding the occurrence of weeds within the catchment undertake works before erosion becomes a significant and general stream health. issue.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 96 Table 10.9 Stormwater Risk Issue 6, Management Element Opportunities Subcatchment: Balcombe Creek and Mt Martha Threat: Building Site Runoff Values: Visual Amenity and Local Receiving Environment
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application A number of sources of material are available that can The distribution of material may be difficult as be used to develop a brochure outlining the impact of the current building regulations make it difficult Literature/Guideline $5,000 Distribute material developed by building site runoff, builders and homeowners to identify home owners until works have MS6-EA-01 Development and (Development $5,000 Shire others to home builders responsibilities and the Shire policy regarding Building commenced. Distribution of Brochure) Site Waste. The material should be issued following the receipt of a building permit. MPSC should lobby the agencies responsible for The costs reflect the cots associated with council regulating building approvals and builders to get officers lobbying the relevant parties. It may be Long Term MPSC to lobby DOI, EPA and changes to legislation implemented so building sites more effective for the Shire to encourage MAV to MS6-EA-02 Individual/Organisational $10,000 Regional MBAV are better managed. Many of the activities proposed undertake lobbying. Consultation under this strategy have been targeted in a VSAP application by Melbourne Water The Shire newsletter, Peninsula Way, and other local Use material developed by other agencies and media outlets could be used to alert the public to the adapt to suit the local needs. Co-ordinate with Use regular media outlets to highlight problem and outline how the problem is being tackled. $5,000 Shire MS3-EA-06 MS6-EA-03 Media Release building site waste issue The Shire website contains material that would be appropriate. Business Stakeholder Establish links with large Through regular discussions with builders and Use the forum established as part of MS3-EA-05 MS6-EA-04 Groups and Committees development and building companies developers educate them regarding there obligations to $5,000 $1,000 Shire as a starting point to contact builders. maintain clean building sites. Develop a pro-forma EMP. Refer to Chapter 6 of Use existing material that has been developed by BPEM Guidelines for key considerations. Checklist others and adapt for local use. An example from would be developed as a single A4 sheet which can be Queensland is provided in Volume 3. faxed, emailed or mailed to builders. The EMP should Develop and Implement Establish a simple EMP for building include sediment and erosion control and waste MS6-SS-01 $6,000 $1,000 Site Specific EMP’s Sites management issues. Council would need to undertake trials with Council Staff explaining use of pro-forma to builders involved in trial. The EMP should cover issues related to sediment and erosion control and waste management. The use of release nets at the outlet of catchments This method for capturing gross pollutants has the during construction phase and the first few years of advantage that the treatment device is relatively mobile and can be moved to take into account development would trap a significant amount of litter. $7,000 - Consider placing trash racks or changes in the drainage network e.g. the This strategy would require the Shire to purchase a $20,000 $9,000 MS6-ST-01 Screening Devices release nets at the outlets of Local extension of a culvert. These devices do not trap number of devices that could be relocated as to purchase cleaning catchments development progresses. It may be possible to force sediments and will require a significant and install some of the cost back on to the developers, builders or commitment from council to manage its homeowners to offset the costs. Costs will vary implementation. depending on the size of the catchment to be treated.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 97 Table 10.10 Stormwater Risk Issue 6, Management Element Opportunities Subcatchment: Balcombe Creek and Mt Martha Threat: Building Site Runoff Values: Visual Amenity and Local Receiving Environment
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application At key points in the drainage system construct The advantage of using gross pollutant traps is permanent gross pollutant traps. The cost will vary that they will trap some sediment fractions. Their Construct Gross Pollutant traps at the depending on the size of the catchment to be treated. $25,000 - installation and successful operation requires the MS6-ST-02 Gross Pollutant Traps $9,000 Local outlet of drainage systems $50,000 drainage network ot be completed. In many developments this will not be the case as works are staged. This device will limit the amount of litter that $40,000 $10,000 Instream Floating Debris Install a Floating Debris and Litter Install a Floating Litter Boom on Balcombe Creek near enters the Balcombe Creek Estuary. It is however MS6-ST-03 (supply and (annual Catchment and Litter Boom Boom on Balcombe Creek the end of Augusta St a significant distance downstream of the major install) cleaning cost) areas of development within the municipality. Building sites within the municipality should be MS6-RE-01 Audit and Inspection Regularly inspect building sites regularly inspected to ensure they are complying with $50,000 Shire Cost will be offset by revenue generated by fines. existing Shire regulations. Use council resources to enforce the existing laws that This strategy is likely to be cost neutral as the relate to building site waste managem ent. The current current fine mechanism will generate revenue. Enforce the existing local laws that Local Law (no. 1) allows for the fining of contractors Infringement Notification The program will require a strong commitment MS6-RE-01 relate to building site Waste or home owners for not complying with the council $40,000 50,000 Shire and Fines from council to education programs as Management regulations. The position would require a part time enforcement without any lead up education is officer (nominally 2 days per week) initially, and this unlikely to be popular amongst the community. time requirement may reduce as practices improve.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 98 Table 10.10 Stormwater Risk Issue 7, Management Element Opportunities Subcatchment: Various Threat: Residential Runoff Values: Local and Regional Receiving Environment
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application The Shire newsletter, Peninsula Wide, and other local The costs are associated with the staff time media outlets could be used to raise the awareness of Use Shire newsletter and local press required to prepare articles. It is expected that MS7-EA-01 Media Release the impacts stormwater from residential areas is having $7,500 Shire to publicise SW issues much of the material will be drawn from existing and measures that can be undertaken to minimise sources and adapted. threat. Over a period of time place signs adjacent to waterways. The signs should include information about the waterway, the impacts that residential areas This program should be co-ordinated with other Placement of signs near waterways are having and what council is doing to offset the programs that recommend signs to develop MS7-EA-02 Signage $15,000 $1,000 Shire and SW outfalls impacts. Signage could also include the outfalls of key standard signs and plan their implementation drains into Port Phillip. The costing assumes that 10 across the municipality. signs will be placed per annum and they will be maintained. A variety of opportunities exist to support local groups who are interested in improving water quality. The Liaise with and encourage Landcare, Community & specific programs to be funded would be identified MS7-EA-03 community groups to be active $10,000 Shire Special Interest Groups following consultation with community groups. It is within their local catchments expected that programs containing a significant education component should be supported.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 99 Table 10.11 Stormwater Risk Issue 8, Management Element Opportunities Subcatchment: Various Threat: Unsealed Road Runoff Values: Various
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application A number of sources of information are available such Literature/Guideline Provide up to date education material as the revised “Unsealed roads manual: guidelines to MS8-EA-01 Development and $1000 Shire to Shire officers good practice”. These materials should be purchased Distribution and distributed to Shire Officers As a first step towards resolving the maintenance of Costs refl ect Officer time spent briefing unsealed roads Council should be briefed regarding the Councilors Long Term outcomes of the SWMP regarding the perceived MS8-EA-02 Individual/Organisational Briefing of Councilors $5,000 Shire impact of unsealed roads. It will be necessary to gain Consultation Council support for any of the other elements to be accepted. The EMP would identify all unsealed roads throughout The strategy is necessary to identify priority areas the municipality, their condition and impact on for management and propose a series of solutions. Develop an EMP for the downstream environments. This information would be Develop and Implement MS8-SS-01 management of unsealed roads used to conduct a risk assessment of the impact of $60,000 Local EMP throughout the municipality unsealed roads to set management priorities. The study would also need to include a significant amount of community consultation.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 100 Table 10.12 Stormwater Risk Issue 9, Management Element Opportunities Subcatchment: Flinders Threat: Septic Tank Systems Values: Local Receiving Environment
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application
Literature & Guideline Educational material for property MS2-EA-01 Part of Management Strategy 2 $5,000 $5,000 Shire Development and owners Distribution MS2-EA-02 Lobby EPA for funding for Waste Part of Management Strategy 2 $10,000 Shire Water Management Strategy This strategy will be the most effective in reducing the impact of the threat septic systems. Long Term Consultation MPSC should take an active role in advocating for the However, this strategy will require a large Lobby Treasury and DOI to fund MS9-EA-01 reticulation of sewers across the municipality and in $5,000 Westernport Catchments financial and political commitment from State construction of reticulated sewers particular within townships draining to Westernport Government and from local residents who may not want to pay to connect or may not perceive there is a problem. MS2-EA-04 Media Release Use regular media outlets to highlight Part of Management Strategy 2 $5,000 $1,000 Shire septic tank management and impacts Identify through regular forums with the community The aim is to keep the community informed and Community Group Education of community regarding MS9-EA-05 that the shire is aware of the issue and that a range of $6,000 Shire support the general education program that will Consultation issue management strategies are being considered. occur as part of MS2-EA-01 and MS2-EA-04. Signs may cause alarm amongst community but The placement of signs adjacent to Dodds Creek and will also be an important tool in raising the profile Place signs adjacent to Dodds Creek MS9-EA-06 Signage near outfall warning of potential faecal contamination 20000 $9,000 Local of the issue with the public. The legal aspects of and its outfall of waters by wastewater. identifying the threat to public health also have to be acknowledged and addressed. The collection of data will provide a tool for the Regularly monitor the surface waters to develop a long term management. It may be that a small MS9-DC-01 Monitoring Monitor quality of surface waters understanding of the source and magnitude of 35000 $9,000 Local number of systems are creating the problem along pollution. Dodds Creek. . The Shire and other agencies responsible for It is assumed that approx 50% properties will not Funding or loans to improve the wastewater and groundwater management should be compliant and it will cost $3000 to upgrade or MS9-RE-01 Financial Incentives condition and operation of septics investigate the opportunities to fund the improvement $40,000 $10,000 Local maintain each system. This program is reliant on within Flinders and upgrading of septic systems to ensure that they there being sufficient legislation to implement meet with current best practice. strategy MS8-RE-02 successfully. It is unclear if legislation exists to require Partner with EPA to initiate a program to inspect septic property owners with non-conforming septic Inspect septic systems to ensure they systems within the Dodds Creek catchment to ensure system to upgrade or maintain systems. The costs MS9-RE-02 Audit & Inspection comply with relevant codes of $50,000 Local that they comply with relevant design guidelines and associated with this program are based XX practice are operating correctly. number of properties to be inspected at $200 per inspection
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 101 Table 10.13 Stormwater Risk Issue 10, Management Element Opportunities Subcatchment: Nepean Threat: Commercial Landuse Values: Various
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application During visits by EPA and council officers distribute Commercial premises should already be aware of Literature/Guideline material to each commercial premise outlining there their obligations regarding waste management Distribute Wastewise information to MS10-EA-01 Development and responsibilities regarding waste management. The $5,000 Local and this material will be updating their shop owners Distribution material should be based on MPSC’s local law knowledge. requirements, EPA and EcoRecycle Material. Long Term Council and EPA officers should Council and EPA officers should have regular contact MS10-EA-02 Individual/Organisational regularly contact commercial (quarterly) with commercial premises to raise $8000 Local Consultation operators awareness of waste management and SW issues. The Shire newsletter, Peninsula Wide, and other local The costs are associated with the staff time media outlets could be used to raise the awareness of required to prepare articles. It is expected that Use Shire newsletter and local press MS10-EA-03 Media Release pollution generated in commercial areas. The material $7,500 Shire much of the material will be drawn from existing to publicise SW issues could be based on a number of sources such s EPA or sources and adapted. EcoRecycle. Over a period of time place signs adjacent to This program should be co-ordinated with other waterways. The signs should include information programs that recommend signs to develop about the waterway, the impacts that residential areas standard signs and plan their implementation Placement of signs near waterways are having and what council is doing to offset the across the municipality. MS10-EA-04 Signage $15,000 $1,000 Shire and SW outfalls impacts. Signage could also include the outfalls of key drains into Port Phillip. The costing assumes that 10 signs will be placed per annum and they will be maintained. f mm Portsea Pier 26400 9000 Local f mm Sorrento Pier 26400 9000 Local f 450 mm Rye Boat Ramp Jetty $9,000 $9,000 Local MS10-ST-01 Screening Devices Install release net devices f 450 mm Rye Pier West $9,000 $9,000 Local f 450 mm Rye Pier East $9,000 $9,000 Local f 450 mm Hunt Avenue $9,000 $9,000 Local f 450 mm Hygeia Street $9,000 $9,000 Local f mm Portsea Pier $182,000 $9,000 Local f mm Sorrento Pier $182,000 $9,000 Local f 450 mm Rye Boat Ramp Jetty $30,000 $9,000 Local MS10-ST-02 Gross Pollutant Traps Install gross pollutant trap f 450 mm Rye Pier West $30,000 $9,000 Local f 450 mm Rye Pier East $30,000 $9,000 Local f 450 mm Hunt Avenue $30,000 $9,000 Local f 450 mm Hygeia Street $30,000 $9,000 Local
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 102 Table 10.13 Stormwater Risk Issue 10, Management Element Opportunities (continued) Subcatchment: Nepean Threat: Commercial Landuse Values: Various
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application Audit commercial premises to ensure waste Enforces a set of local laws and requirements that management practices in place are adequate. It may be are well established. Commercial premises Audit and Inspection of Commercial MS10-RE-01 Audit and Inspection beneficial to involve EPA in the process. The audit is $8,000 Local should be warned prior to first audit. Premises an important means of establishing contact with the stakeholders. MS10-RE-02 Infringement Notification Use Local Laws and EPA powers to The use of infringement notices should be seen as a $50,000 Local and Fines issue infringement notices. tool of last resort.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 103 Table 10.14 Stormwater Risk Issue 11, Management Element Opportunities Subcatchment: Merricks Creek and Shoreham Threat: Waterway Degradation Values: Instream Habitat
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application This is a long term program that is as much about Through existing networks, e.g. Landcare, identify engaging the community as achieving sites for stream rehabilitation and protection. Support improvements in waterway management. would be in the form of a funding contribution to the Undertake works on private land with Funding opportunities should be investigated via MS11-EA-01 Demonstration Projects landowner, who would be responsible for the $7,500 $7,500 Local co-operative landholders National Heritage Trust. Costs assumed 500 implementation of the works and their maintenance. lineal metres of stream fenced and re-vegetated. In general, properties containing sites identified within No allowance has been made or stabilization the due diligence study should be target first. works. A significant amount of the waterways are The regional drainage authority should develop links contained within private properties and their with farmers via an existing community group such as management will require negotiation landowners. Landcare, Community and Liaise with community groups to Landcare. Extension activities would include MS11-EA-02 $5,000 Local The existing Landcare network provides a good Special Interest Groups improve waterway management information about funding opportunities such as opportunity to contact property owners who MS11-EA-01, assistance with grant applications and would be interested in undertaking works to co-ordination with groups within the region. protect their waterways. Given that these are relatively low priority actions A number of sites of significant waterway erosion Undertake works outlined in Due within the stormwater management plan and it Waterway Rehabilitation were identified within the Due Diligence Study. The MS11-SC-01 Diligence Study for Merricks Creek $140,000 $10,000 Local may be some time before the works are and Revegetation cost associated with the works reflects the estimates in and Shoreham catchments undertaken, the need for these works should be the Due Diligence Study. confirmed prior to them being undertaken. Develop a waterway management strategy for This strategy along with the regular inspection waterways within the catchments. The strategy should program will build a long term picture of the identify the condition of the stream, location of any condition of waterways and aid the planning of Waterway Management Develop Waterway Management MS11-SS-01 existing works and who owns the surrounding land. $20,000 Local works. Strategy Development Strategy for Waterways The findings of the Due Diligence study forms good basis, however, it will require a more detailed study to be completed. Regular inspections of the waterways should be By developing links with the community and undertaken to identify sites where erosion is landholders it may be possible to reduce the cost developing. The early identification of problem spots $5,000 of this program by getting landholders to collect Undertake regular waterway will allow works to be undertaken to prevent the (Bi-Annual data. MS11-DC-01 Monitoring Local condition assessments within erosion sites developing. It is suggested that the initial Survey of survey be thorough and form part of the Waterway $10,000 each) Management Plan and bi-annual inspections be carried out.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 104 Table 10.14 Stormwater Risk Issue 11, Management Element Opportunities (continued) Subcatchment: Merricks Creek and Shoreham Threat: Waterway Degradation Values: Instream Habitat
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application Develop a system of partially funding stream This is an important program to support the rehabilitation works on private property. A number of demonstration projects and community funding models could be adopted and examples of consultation. The works will be most effective if Fund stream rehabilitation works on schemes that have had success in other areas include they are applied in accordance with a Waterway MS11-RE-01 Financial Incentives $10,000 Local private property cost sharing for all works or funding of stream and Management Plan as priority areas can be revegetation works with fencing the responsibility of targeted. the landowner. In all cases it is assumed the landowner will be responsible for maintenance.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 105 Table 10.15 Stormwater Risk Issue 12, Management Element Opportunities Subcatchment: Shoreham and Merricks Threat: Septic Tank Systems Values: Recreational Amenity
Element Management Action Approximate Cost Extent of Element Type Location & Description Comment Number Opportunity Capital Ongoing Application
Literature & Guideline Educational material for property MS2-EA-01 Part of Management Strategy 2 $5000 Shire Development and owners Distribution MS2-EA-02 Lobby EPA for funding for Waste Part of Management Strategy 2 $5,000 Shire Water Management Strategy This strategy will be the most effective in reducing the impact of the threat septic systems. Long Term Consultation MPSC should take an active role in advocating for the However, this strategy will require a large Lobby Treasury and DOI to fund MS12-EA-01 reticulation of sewers across the municipality and in $5,000 Westernport Catchments financial and political commitment from State construction of reticulated sewers particular within townships draining to Westernport Government and from local residents who may not want to pay to connect or may not perceive there is a problem. MS2-EA-04 Media Release Use regular media outlets to highlight Part of Management Strategy 2 $7,500 Shire septic tank management and impacts The aim is to keep the community informed and support the general education program that will Identify through regular forums with the community occur as part of MS2-EA-01 and MS2-EA-04. It Community Group Education of community regarding MS12-EA-02 that the shire is aware of the issue and that a range of $7,500 Westernport Catchments is expected that some townships such as Merricks Consultation issue management strategies are being considered. Beach will require a long term consultation program to negotiate any reticulation program with the community. It would be expected a monitoring program will Regularly monitor the surface waters to develop a help to set management directions for the future MS12-DC-01 Monitoring Monitor quality of surface waters understanding of the source, magnitude and flow paths $40,000 Local and be used as a tool to inform the community as of pollution. to the magnitude of risks posed by septic overflows This program will depend on the number of Funding or loans to improve the systems within the catchment that require MS8-RE-01 Financial Incentives condition and operation of septics Part of Management Strategy 8 $300,000 Local upgrades. Costs are based on 100 properties within Flinders requiring upgrades at $3000 per septic system. It is unclear if legislation exists to require Partner with EPA to initiate a program to inspect septic property owners with non-conforming septic Inspect septic systems to ensure they systems within Merricks Beach and Shoreham to system to upgrade or maintain systems. The costs MS12-RE-02 Audit & Inspection comply with relevant codes of $100,000 Local ensure that they comply with relevant design associated with this program are based 500 practice guidelines and are operating correctly. number of properties to be inspected at $200 per inspection
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 106
10.4 Stormwater Risk Management Strategy Formulation
10.4.1 Objective of Management Strategy Formulation
The formulation of specific Management Strategies involves the selection and grouping of specific Management Element Opportunities defined in the previous subsection. It is not practical or economical to recommend all Management Element Opportunities as part of each Management Strategy. In addition, there is some overlap in the treatment capabilities of particular elements, resulting in certain elements not being necessary if others are selected. For example, if a series of drainage inlet pits were to be selected, it would not be necessary to incorporate trash racks or gross pollutant traps at the outlet of the drainage system they are protecting.
The key objective in formulating Management Strategies is to define a combination of Management Element Opportunities that represents the best value for money in terms of providing the highest level of environmental management at the lowest cost.
10.4.2 Approach to Management Strategy Formulation
To define the combination of Management Elements representing the best value for money, it is necessary to individually analyse each Management Element Opportunity to provide a comparative measure of cost effectiveness. This process involves the assessment of Management Element Opportunities using a number of criteria to form the basis of a Multi-Criteria Analysis (MCA) and determination of a cost ratio. The criteria and other parameters, which have been adopted to undertake this analysis, are summarised in Table 10.16. Table 10.16 Strategy Formulation Criteria
Criteria or Indicator Description Measure or Unit Cost Indicators 1. Capital Cost Cost associated with construction of a structural measure or development/implementation of a non- Dollars ($) structural measure. Capital cost reflects the standard implementation cost based on past experience or indicative values provided in the BPEM Guidelines. 2. Ongoing or The cost associated with ongoing maintenance, implementation or review of the management element Dollars ($) /year Maintenance Cost opportunity. 3. Lifetime Life cycle or implementation time for measure or program Years 4. Total Cost Total life cycle cost for proposed management element opportunity. Dollars ($) Performance Indicators 5. Effective Life Period of effectiveness for measure. For structural measures, this is generally taken to be equivalent to Years the measures lifetime. For certain education and awareness activities this may be slightly longer as effectiveness may extend beyond the duration of the program. 6. % Threat Treated Percentage of the threats over which the threat occurs which will be treated by the particular measure. % 7. Effectiveness The effectiveness of the management element opportunity to minimise the threat. V.Low – V.High 8. Implementation The feasibility of implementing a particular management element within the given site constraints or V.Low – V.High Feasibility management framework. 9. Multiple Benefit Secondary benefits associated with developing and/or implementing a particular element. For example, V.Low – V.High application of the measure in other areas (eg. literature for industrial operations). 10. Desirability The elements p erceived long term sustainability or compatibility with current industry best practice in V.Low – V.High Sustainability relation to stormwater management (eg. end of pipe may be less desirable than source control).
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 107
Each criteria or indicator is assessed for each Management Element Opportunity. Indicators relating to Effectiveness, Implementation Feasibility, Multiple Benefit and Desirability Sustainability are rated from Very Low (Negligible) to Very High. For Effectiveness these values are based on data presented in the BPEM Guidelines for Urban Stormwater. Values for other indicators are estimated based on the Study Team’s knowledge of the site and current industry practice. A quantitative value is then assigned to each qualitative measure, ranging from 0 to 1. The correlation between qualitative and quantitative values is presented in Table 10.17. Table 10.17 Correlation of Quantitative and Qualitative Measures for MCA
Treatment Effectiveness Other Criteria Qualitative Indicator Value BPEM Guidelines Adopted Value Adopted Value
Very Low (Negligible) 0% to 10% 5% 5%
Low 10% to 40% 30% 30%
Moderate 40% to 60% 50% 50%
Very High 60% to 90% 70% 70%
Based on the values derived for each criteria (indicator), a single score is calculated for each Management Element Opportunity reflecting its cost effectiveness. Cost effectiveness is calculated using the various criteria as follows:
CapitalCost + (OngoingCost ´ Lifecycle) EffectiveLifecycle´%ThreatTreated ´ Effectiveness ´ Feasibility ´ MultipleBenefit´ Desirability
The score that is derived for each Management Element Opportunity is in $/year. Low scores reflect a high level of cost effectiveness. In its own right, the score has little meaning other than for comparative purposes with scores for other elements being considered for the specific strategy. Scores for Element Opportunity from different Management Strategies (or Risk Groups) should not be compared.
Management Strategies are formulated by selecting Management Element Opportunities with the lowest cost effectiveness scores, reflecting those which offer the greatest value for money. For elements offering similar types of treatment, the Management Element Opportunity the lower score is always selected. In addition, management elements with excessively high scores are not recommended.
In certain instances, all Management Element Opportunities have been selected to form a Management Strategy. This has occurred for Stormwater Risk Issues 5, 7, 8 and 11.
The selection of Management Element Opportunities as part of Management Strategies also aims to ensure that Strategies possess a balance of both structural and non-structural measures. The achievement of this requires a balanced approach to stormwater management that does not rely solely on technological solutions to management.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 108
10.4.3 Results of Cost Effectiveness Analysis
Appendix F in Volume III presents the results of each cost effectiveness analysis undertaken. The tables show the adopted criteria values and scores calculated for cost effectiveness. Management Element Opportunities have been ranked, in accordance with their cost effectiveness scores, from highest to lowest. Shaded management elements have not been recommended as part of management strategies ads they are either not considered to be cost effective or are superseded by another element.
10.4.4 Reactive Management Strategies
Tables 10.21 to 10.33 present the 12 Management Strategies that have been developed in response to the 12 Stormwater Management Issues identified in Chapter 9. Each table provides details of specific Management Element Opportunities, their capital and operating costs, responsibility for implementation and extent of application.
The key intent and elements of each strategy is summarised as follows:
Strategy 1 - The main focus of the strategy is the support of existing extension programs that are in place and are intended to increase awareness amongst the farming community of environmental issues and the impact of farming activities on them. Given the scale of the threat and the nature of the drainage system many structural practices are inappropriate. However, it is suggested that some programs such as the construction of a regional wetland facility and stream side rehabilitation be investigated further.
Strategy 2 - The combination of strategies selected is intended to use education of the community to raise the general awareness regarding the impacts septic systems are having and the correct operation and maintenance of septic systems. The aim of these programs is to encourage residents to improve their systems at their own cost and generate an understanding of the issues amongst various levels of government with a view to obtaining funding for Capital works. Two items, funding of septic system upgrades and connection of households to existing sewers, are extremely high cost programs but have been selected as they will be highly effective in reducing the impacts to the groundwater table.
Strategy 3 – Education and site specific strategies were found to provide the most cost effective solutions for reducing the impacts of areas of subdivisional development. Many of the education strategies are relatively low cost and involve signage, distribution of guidelines to developers and consultation with other agencies to improve the legislative tools available to regulate developers. The development of Site Specific sediment and erosion control plans for construction sites is also recommended.
Strategy 4 – Five management elements were selected to improve the quality of runoff from the market garden areas within Chinamans Creek. Key elements of the management strategy include the education programs and demonstration projects that will be developed using experience gained in the Watsons Creek Strategy. The adoption of material from the Watsons Creek program significantly reduces cost associated with establishing this program. Consultation with the farming community via a council extension officer is also an import part of the strategy, as it will provide an opportunity for the Shire to build a network with the farming community and pass on educative material. The consultation will also be necessary if the Shire and industry groups such as the Vegetable Growers
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 109
Association and the Victorian Farmers Federation are going to convince the framers to develop and implement environmental management plans for their farms. The Capital works and monitoring programs associated with this program were not feasible due to either their high cost or limited effectiveness in reducing the threat.
Strategy 5 – This strategy only contains two elements and was not subjected to the screening process. Therefore it is recommended that the waterway rehabilitation works be undertaken to prevent further erosion within Hearn Creek and a monitoring program be implemented to regularly inspect the waterways within Mt Martha.
Strategy 6 – The management elements selected to manage building sites involve strategies to require builders to better manage their sites using site specific EMP’s, a number of education programs to raise the awareness of the issue amongst the general community and builders and the installation of gross pollutant traps to capture pollutants. Fining of builders for poor on-site practices and regular audit were not considered to be cost effectiveness due the expected low effectiveness and low desirability, as these activities are likely to upset the building community and inhibit other activities.
Strategy 7 – Given that only three elements were selected and the total cost of this strategy is relatively low it is suggested that all the elements be implemented in order to reduce the threat posed by the stormwater system. The management strategy will involve media releases, signage of waterways within urban areas and the support of community groups.
Strategy 8 – To manage the threat posed by unsealed roads it is proposed to implement a management strategy that includes elements to educate council officers regarding their correct management, undertake and audit of the condition of unsealed roads throughout the municipality and that briefings to Council are undertaken to raise the profile of the issue.
Strategy 9 – Management of the threat posed by septic tank system within the Flinders Township is in many cases similar to Strategy 2, with at least 3 of the strategies developed for Strategy 2 applicable. The management elements developed specifically for this issue include the lobbying of State Government to provide resources for sewer reticulation, liaison with the community to raise the awareness of the issues and monitoring of surface waters within the catchment to identify the sources of pollution.
Strategy 10 – The management strategy adopted to treat the runoff commercial areas includes a variety of measures including a number of education programs and several structural measures. The education activities to be undertaken are intended to improve the waste management practices of the shop owners via extension activities in conjunction with the EPA and raise the awareness of the public regarding the issue through a media program and signage along local beaches to highlight the impacts of litter. The isolated nature of the threat has resulted in the recommendation of a number of gross pollutant traps on drain outlets downstream of the commercial areas.
Strategy 11- All of the opportunities identified to mitigate waterway degradation within the Merricks Creek and Shoreham catchments have been recommended for inclusion within the strategy as they all have high cost effectiveness. The highest priority elements are the establishment of demonstration projects and financial incentives to encourage landowners to undertake stream frontage protection
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 110
works. The development of a waterway management strategy for the catchments is also recommended.
Strategy 12 – This strategy is similar to strategies 2 and 9 and contains many of the similar elements to minimise the threat posed by poorly performing septic systems within the Merricks Creek and Shoreham catchments. The strategy includes elements that are aimed at educating and consultation with the community to raise the awareness of the issue and its impacts and lobbying of state government to provide funding for sewer reticulation. Financial incentives to improve the performance of septic systems and auditing to identify poorly performing septics were not recommended as they are not cost effective.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 111
Table 10.18 Stormwater Risk Issue 1, Agricultural Runoff in Watsons Creek
Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application MPSC, MW, EPA and other agencies and stakeholders should develop a water quality management strategy for the catchment. This action is identified in the revised SEPP (F8). MW is identified in the SEPP as Development of a Water Quality having responsibility for the project and it would be MS1-SS-01 Management Strategy for the $40,000 $5,000 Local MW, EPA, NRE, SRW & MPSC expected that the Shire would be a major stakeholder. Watsons Creek catchment This program will be a key management tool for the catchment and would be expected to identify pollutant sources, impacts and measures to improve water quality. A Waterway Management Strategy is required which specifically focuses on management of the Creek and Develop a Waterway Management drainage line corridors. The management strategy MS1-SS-02 Local MW Strategy for Watsons Creek should consider revegetation requirements (buffer $60,000 planting), water quality management (eg. stormwater inflow locations) and stabilisation of over-banks. MPSC presently funds a number of community MS1-EA-02 Fund Community Groups groups. It is suggested that the support is continued, as $5,000 Local MPSC it is an important means of engaging the community. It is expected that a large number of sites will be identified within the waterway activity plan. Many of the sites will be adjacent to private land and it will be necessary negotiate with landholders prior to undertaking works. The location and scale of works MPSC, MW & external funding bodies such as MS1-SC-01 Stream frontage protection works $10,000 Local will not be fully defined until the Waterway NHT Management Strategy (MS1-SS-02) is complete. The funding allocated reflects the ongoing commitment that would be required to support a waterway rehabilitation program. MPSC should take a lead in the co-ordination of stakeholders throughout the catchment. Actions of the large number of agencies and stakeholders should be MS1-EA-01 Co-ordination of stakeholders $10,000 Local MPSC co-ordinated and their outcomes uniformly reported. It is expected that this role would be undertaken by the council officer already appointed to the project.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 112
Table 10.19 Stormwater Risk Issue 2, Septic Tank Systems with the Nepean Peninsula Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application The Shire newsletter, Peninsula Way, and other local Use regular media outlets to highlight media outlets could be used to alert the public to the MS2-EA-04 $7,500 Shire MPSC septic tank management and impacts problem and make a series of suggestions to property owners regarding the management of septic systems. Lobby MAV for funding for Shire officers should continue to lobby the MAV to MS2-EA-02 Municipal Waste Water Management provide funding for a Waste Water management $5,000 Shire MPSC Strategy Strategy for the municipality MPSC should take an active role in advocating for the Lobby State Government to fund MS2-EA-03 reticulation of sewers across the municipality and in $5,000 Shire MPSC construction of reticulated sewers particular within the Nepean Peninsula Development or adoption of material to educate property owners regarding septic systems, their Educational material for property MS2-EA-01 management and the impact they are having on the $15,000 $5,000 Local MPSC & EPA owners environment. Distribution should include each property within Shire The Shire and other agencies responsible for Funding or loans to improve the wastewater and groundwater management should MS2-RE-01 condition and operation of septics investigate the opportunities to fund the improvement $150,000 Local EPA, MPSC, NRE & SRW within the municipality and upgrading of septic systems to ensure that they meet with current best practice. The placement of signs, or augmentation of existing Place signs adjacent to open water signs, adjacent to open water bodies will allow the MS2-EA-05 $5,000 $1,000 Local MPSC bodies declining water quality of the groundwater aquifer to be highlighted and linked to septic systems. Funding the connection of properties to the reticulated Funding or loans to subsidise the MS2-RE-02 sewer where a sewer exists and properties have septic $3,000,000 Local EPA, MPSC, NRE & SRW connection of houses to sewer system The groundwater table should be regularly monitored Monitor condition of Groundwater MS2-DC-01 to determine its level and concentration of a range of $20,000 Local NRE & SRW Table pollutants MS2-SS-04 Implement Groundwater Finalise and implement the groundwater management $20,000 $10,000 Local EPA, MPSC, NRE & SRW Management Strategy plan under development by the EPA
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 113
Table 10.20 Stormwater Risk Issue 3, Subdivisional Developments Throughout the Municipality
Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application Signs should be place adjacent to environmental assets that are being threatened by development activities to Use signs as part of general MS3-EA-06 highlight the impacts and cause. Signs should also be $5,000 $500 Local MPSC community education program erected adjacent to any demonstration sites to highlight what works are being undertaken. Develop educational material for construction site management that is relevant to small scale (< 50 lot) Development of brochures for MS3-EA-01 developments. The document should be concise, $5,000 Regional MPSC Developers and Contractors outlining the issue, methods to reduce impacts and the role of local government in enforcing compliance. For all development applications Council should require development of a detailed sediment and erosion control plan. Plan should identify construction Require sediment and erosion control staging, control measures, monitoring regime (eg. MS3-SS-02 $10,000 Local MPSC & Developers plan for all new developments visual inspection) and responsible individual (eg. site foreman). Plans should be in accordance with Council specifications and BPEM Guidelines. For major sites this should form part of an EMP. Construction site issues require a regional focus and Liaison with Agencies regarding MS3-EA-04 MPSC should lobby DOI, EPA and MBAV to develop $5,000 Regional MPSC, DOI, EPA & MBAV changing Laws uniform state laws, model local laws and guidelines. As part of general extension activities to development industry it may be appropriate to establish a forum or use an existing forum to communicate with developers Establish regular communication MS3-EA-07 on the Peninsula regarding SW issues. The Peninsula $3,000 Shire MPSC with developers regarding SW Issues is likely to require its own forum as many industry forums are Melbourne based and locals may not travel to them. MS3-EA-05 Use local media to educate public Use the Shire newsletter, Peninsula Way, and other $7,500 Shire MPSC local media outlets to raise the awareness Run a half day seminar with invited representative from major developers who are active in the Education Workshops for Developers MS3-EA-02 municipality. Introduce the Stormwater Management $10,000 Regional MPSC, EPA & MBAV and Contractors Plan and outline Council’s new initiatives, commitments and expectations regarding stormwater management.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 114
Table 10.20 Stormwater Risk Issue 3, Subdivisional Developments Throughout the Municipality (continued) Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application Environmental Management Plans identify potential impacts of development, management actions for minimising impacts and processes for monitoring impacts during development. A Sediment and Erosion Require Environmental Management Control Plan would be a subset of an EMP. EMP MS3-SS-01 $40,000 Shire MPSC Plans for Major Developments should only be required where a development is likely to have a major impact on the receiving environment. Plans should consider flora, fauna, geomorphology, stormwater, flooding, air and noise, and site contamination (where relevant).
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 115
Table 10.21 Stormwater Risk Issue 4, Market Gardens in Chinamans Creek
Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application As part of the Watsons Creek Action Plan a series of education tools will be developed, these tools will be Use material developed for Watsons applicable to the Chinamans Creek market garden MS4-EA-01 Creek catchment and distribute to $2,000 Local MPSC areas. The shire will be able to distribute the farmers guidelines through extension activities undertaken in program Several demonstration sites are proposed as part of the Watsons Creek Action Program. Rather than develop Use the demonstration sites new sites it would be better to use the existing program MS4-EA-02 developed as part of the Watsons $5000 Local MPSC and run tours through the sites. The extension Creek Action Program activities proposed in MS4-EA-03 to be used to identify participants Use long term extension activities to build links with market gardeners. The position would require an input of 1 or 2 days a month to maintain regular contact with Develop relationships with market the landholders. It may be worthwhile for MPSC to MS4-EA-03 $10,000 $10,000 Local MPSC, EPA & VFF gardeners within catchment partner with another agency or group to combine the environmental objectives with an agronomy program. Alternatively the position could be incorporated into another Shire program related to the environment. The EMP should consider all aspects of water, nutrient and soil management on market garden sites. The Develop EMP’s for large market MS4-SS-01 successful implementation of an EMP should have $10,000 $2,000 Local MPSC & Land owners gardens benefits for the environment and economics through improved productivity. The Chinamans Creek Catchment Strategy contains a detailed analysis of the catchment and makes a series of management recommendations. The document Finalise Chinamans Creek Catchment should be updated to reflect current issues, in particular MS4-SS-02 $5,000 Local MPSC Strategy the market garden issues, and adopted by council. This strategy will integrate with the Water Quality Management Strategy (MS2-SS-04) proposed for the Nepean Peninsula.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 116
Table 10.22 Stormwater Risk Issue 5, Waterway Degradation in Mt Martha
Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application 3 sites have been identified within the Hearn Creek Undertake stream stabilisation works Catchment where stabilisation works are required. MS5-SC-01 identified in Hearn Creek as part Due The works are primarily engineering works to stabilise $150,000 $5,000 Local MPSC Diligence Study creek beds although follow up revegetation programs will help improve the amenity offered by the creek. The aim of the inspection program is to regularly Regular inspections of the waterways identify the areas where erosion is occurring and to MS5-DC-01 $5,000 Subcatchment MPSC within the catchment undertake works before erosion becomes a significant issue.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 117
Table 10.23 Stormwater Risk Issue 6, Building Site Runoff in Balcombe Creek and Mt Martha
Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application Develop a pro-forma EMP. Refer to Chapter 6 of BPEM Guidelines for key considerations. Checklist would be developed as a single A4 sheet which can be faxed, emailed or mailed to builders. The EMP should Establish a simple EMP for building include sediment and erosion control and waste MS6-SS-01 $6,000 $1,000 Shire MPSC, EPA, DOI & MBAV Sites management issues. Council would need to undertake trials with Council Staff explaining use of pro-forma to builders involved in trial. The EMP should cover issues related to sediment and erosion control and waste management. Through regular discussions with builders and Establish links with large MS6-EA-04 developers educate them regarding their obligations to $5,000 $1,000 Shire MPSC development and building companies maintain clean building sites. The Shire newsletter, Peninsula Way, and other local media outlets could be used to alert the public to the Use regular media outlets to highlight MS6-EA-03 problem and outline how the problem is being tackled. $5,000 Shire MPSC building site waste issue The Shire website contains material that would be appropriate. At key points in the drainage system construct $25,000 - Construct Gross Pollutant traps at the permanent gross pollutant traps. The cost will vary MS6-ST-02 $50,000 Local MPSC outlet of drainage systems depending on the size of the catchment to be treated. $9,000 (per GPT) A number of sources of material are available that can be used to develop a brochure outlining the impact of $5,000 Distribute material developed by building site runoff, builders and homeowners MS6-EA-01 (Development $5,000 Shire MPSC others to home builders responsibilities and the Shire policy regarding Building of Brochure) Site Waste. The material should be issued following the receipt of a building permit. MPSC should lobby the agencies responsible for regulating building approvals and builders to get MPSC to lobby DOI, EPA and changes to legislation implemented so building sites MS6-EA-02 $10,000 Regional MPSC MBAV are better managed. Many of the activities proposed under this strategy have been targeted in a VSAP application by Melbourne Water
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 118
Table 10.24 Stormwater Risk Issue 7, Residential Runoff Throughout the Municipality
Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application The Shire newsletter, Peninsula Wide, and other local media outlets could be used to raise the awareness of Use Shire newsletter and local press MS7-EA-01 the impacts stormwater from residential areas is having $7,500 Shire MPSC to publicise SW issues and measures that can be undertaken to minimise threat. Over a period of time place signs adjacent to waterways. The signs should include information about the waterway, the impacts that residential areas Placement of signs near waterways are having and what council is doing to offset the MS7-EA-02 $15,000 $1,000 Shire MPSC and SW outfalls impacts. Signage could also include the outfalls of key drains into Port Phillip. The costing assumes that 10 signs will be placed per annum and they will be maintained. A variety of opportunities exist to support local groups who are interested in improving water quality. The Liaise with and encourage specific programs to be funded would be identified MS7-EA-03 community groups to be active $10,000 Shire MPSC following consultation with community groups. It is within their local catchments expected that programs containing a significant education component should be supported.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 119
Table 10.25 Stormwater Risk Issue 8, Management of Unsealed Road Runoff
Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application A number of sources of information are available such Provide up to date education material as the revised “Unsealed roads manual: guidelines to MS8-EA-01 $1000 Shire MPSC to Shire officers good practice”. These materials should be purchased and distributed to Shire Officers As a first step towards resolving the maintenance of unsealed roads Council should be briefed regarding the outcomes of the SWMP regarding the perceived MS8-EA-02 Briefing of Councilors $5,000 Shire MPSC impact of unsealed roads. It will be necessary to gain Council support for any of the other elements to be accepted. The EMP would identify all unsealed roads throughout the municipality, their condition and impact on Develop an EMP for the downstream environments. This information would be MS8-SS-01 management of unsealed roads used to conduct a risk assessment of the impact of $60,000 Shire MPSC throughout the municipality unsealed roads to set management priorities. The study would also need to include a significant amount of community consultation.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 120
Table 10.26 Stormwater Risk Issue 9, Management of Septic Tanks in Flinders
Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application Regularly monitor the surface waters to develop a Monitor quality of surface waters to MS9-DC-01 understanding of the source and magnitude of 35000 $9,000 Local MPSC & EPA identify source of pollution pollution. Identify through regular forums with the community Education of community regarding MS9-EA-05 that the shire is aware of the issue and that a range of $6,000 Shire MPSC issue management strategies are being considered. MS2-EA-04 Use regular media outlets to highlight Part of Management Strategy 2 $5,000 $1,000 Shire MPSC septic tank management and impacts MPSC should take an active role in advocating for the Lobby Treasury and DOI to fund MS9-EA-03 reticulation of sewers across the municipality and in $5,000 Westernport Catchments MPSC construction of reticulated sewers particular within townships draining to Westernport MS2-EA-01 Educational material for property Part of Management Strategy 2 $5,000 $5,000 Shire MPSC, & EPA owners MS2-EA-02 Lobby EPA for funding for Waste Part of Management Strategy 2 $10,000 Shire MPSC Water Management Strategy The placement of signs adjacent to Dodds Creek and Place signs adjacent to Dodds Creek MS9-EA-06 near outfall warning of potential faecal contamination 20000 $9,000 Local MPSC and its outfall of waters by wastewater.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 121
Table 10.27 Stormwater Risk Issue 10, Management of Commercial Areas on the Nepean Peninsula
Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application During visits by EPA and council officers distribute material to each commercial premise outlining there Distribute Wastewise information to MS10-EA-01 responsibilities regarding waste management. The $5,000 Local MPSC & EPA shop owners material should be based on MPSC’s local law requirements, EPA and EcoRecycle Material. Council and EPA officers should Council and EPA officers should have regular contact MS10-EA-02 regularly contact commercial (quarterly) with commercial premises to raise $8000 Local MPSC & EPA operators awareness of waste management and SW issues. The Shire newsletter, Peninsula Wide, and other local media outlets could be used to raise the awareness of Use Shire newsletter and local press MS10-EA-03 pollution generated in commercial areas. The material $7,500 Shire MPSC to publicise SW issues could be based on a number of sources such s EPA or EcoRecycle. Over a period of time place signs adjacent to waterways. The signs should include information about the waterway, the impacts that residential areas Placement of signs near waterways are having and what council is doing to offset the MS10-EA-04 $15,000 $1,000 Shire MPSC and SW outfalls impacts. Signage could also include the outfalls of key drains into Port Phillip. The costing assumes that 10 signs will be placed per annum and they will be maintained. MS10-ST-02 Install gross pollutant trap f 1500 mm Sorrento Pier $182,000 $9,000 Local MPSC MS10-ST-02 Install gross pollutant trap f 450 mm Hygeia Street $30,000 $9,000 Local MPSC MS10-ST-01 Install release net devices f 1500 mm Portsea Pier $26,400 $9000 Local MPSC MS10-ST-01 Install release net devices f 450 mm Hunt Avenue $9,000 $9,000 Local MPSC
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 122
Table 10.28 Stormwater Risk Issue 10, Management of Commercial Areas on the Nepean Peninsula Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application Audit commercial premises to ensure waste management practices in place are adequate. It may be Audit and Inspection of Commercial MS10-RE-01 beneficial to involve EPA in the process. The audit is $8,000 Local MPSC & EPA Premises an important means of establishing contact with the stakeholders. MS10-RE-02 Use Local Laws and EPA powers to The use of infringement notices should be seen as a $50,000 Local MPSC & EPA issue infringement notices. tool of last resort.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 123
Table 10.29 Stormwater Risk Issue 11, Management of Waterway Degradation in Merricks Creek and Shoreham Subcatchments
Element Management Action Approximate Cost Extent of Location & Description Responsibility Number Opportunity Capital Ongoing Application Through existing networks, e.g. Landcare, identify sites for stream rehabilitation and protection. Support would be in the form of a funding contribution to the Undertake works on private land with MS11-EA-01 landowner, who would be responsible for the $7,500 $7,500 Local MPSC, Landcare & Land Holders co-operative landholders implementation of the works and their maintenance. In general, properties containing sites identified within the due diligence study should be target first. Develop a system of partially funding stream rehabilitation works on private property. A number of funding models could be adopted and examples of Fund stream rehabilitation works on schemes that have had success in other areas include MS11-RE-01 $10,000 Local MPSC private property cost sharing for all works or funding of stream and revegetation works with fencing the responsibility of the landowner. In all cases it is assumed the landowner will be responsible for maintenance. Develop a waterway management strategy for waterways within the catchments. The strategy should identify the condition of the stream, location of any Develop Waterway Management MS11-SS-01 existing works and who owns the surrounding land. $20,000 Local MPSC Strategy for Waterways The findings of the Due Diligence study forms good basis, however, it will require a more detailed study to be completed. The regional drainage authority should develop links with farmers via an existing community group such as Liaise with community groups to Landcare. Extension activities would include MS11-EA-02 $5,000 Local MPSC & Landcare improve waterway management information about funding opportunities such as MS11-EA-01, assistance with grant applications and co-ordination with groups within the region. A number of sites of significant waterway erosion Undertake works outlined in Due were identified within the Due Diligence Study. The MS11-SC-01 Diligence Study for Merricks Creek $140,000 $10,000 Local MPSC cost associated with the works reflects the estimates in and Shoreham catchments the Due Diligence Study. Regular inspections of the waterways should be undertaken to identify sites where erosion is developing. The early identification of problem spots $5,000 Undertake regular waterway will allow works to be undertaken to prevent the (Bi-Annual MS11-DC-01 Local MPSC condition assessments within erosion sites developing. It is suggested that the initial Survey of survey be thorough and form part of the Waterway $10,000 each) Management Plan and bi-annual inspections be carried out.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA STORMWATER RISK MANAGEMENT STRATEGIES 124
Table 10.30 Stormwater Risk Issue 12, Management of Septic Tanks Systems in Merricks Creek and Shoreham Subcatchments
Element Approximate Cost Extent of Element Type Location & Description Responsibility Number Capital Ongoing Application
MS2-EA-01 Literature Guideline Development and Distribution Educational material for property owners $5,000 Shire MPSC (Part of Management Strategy 2) Lobby MAV for funding for Waste Water MS2-EA-02 Long Term Consultation Management Strategy $5,000 Shire MPSC (Part of Management Strategy 2) MPSC should take an active role in advocating for the MS12-EA-01 Long Term Consultation reticulation of sewers across the municipality and in $5,000 Westernport Catchments MPSC particular within townships draining to Westernport Use regular media outlets to highlight septic tank MS2-EA-04 Media Release management and impacts $7,500 Shire MPSC (Part of Management Strategy 2) Identify through regular forums with the community MS12-EA-02 Community Consultation that the Shire is aware of the issue and that a range of $7,500 Local MPSC management strategies are being considered.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK STRATEGIES 125
11 MANAGEMENT FRAMEWORK STRATEGIES
This chapter outlines Management Framework Strategies that have been developed in response to priority management framework issues. The following subsections outline the process adopted and recommended management framework strategies that have been developed.
11.1 Adopted Approach
The process adopted in deriving Management Framework Strategies differs considerably from that adopted for deriving Risk Management Strategies. This is because proposed actions that respond to Priority Management Framework Issues cannot be selected from a range of generic measures or management options. Instead, it is necessary to develop strategy recommendations that are tailored to specifically respond to management framework deficiencies and build on strengths within the organisation. The development of these strategies requires close liaison with Council Officers who will be responsible for their implementation. In accordance with this, the derivation of Management Framework Strategies involved: · Identification of groups of possible preliminary management actions that could be applied in response to each priority management framework issue; · Workshop discussions with selected staff from various departments within the Market Development and Planning Division to consider the feasibility of implementing each of the various management actions; and · Endorsement of proposed management actions and strategies by members of the Project Working Group.
The derivation of specific management actions carefully considered the practicalities associated with their implementation.
11.2 Management Action Costs
Management actions that have been identified as part of specific strategies generally fall into three categories as follows: · Actions that require implementation by Council Officers through the modification of existing practices and processes; · Actions that involve the development of documentation, guidelines, training or changes in protocols that will require external consultant input (or could alternatively be implemented by Council Officers); and · Actions that involve major adjustments to Council documentation that should occur as part of periodical amendments or document revisions (eg. revision of the MSS).
Cost estimates have been provided for specific management actions that could be out sourced to consultants or contractors. However, it is advisable that these actions be undertaken internally wherever possible to increase Council’s understanding, ownership and commitment to the actions.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK STRATEGIES 126
11.3 Responsibility for Implementation
In all cases the responsibility for implementing specific management actions will lie with Council. While support and assistance may be provided by external organisations (such as DOI or EPA), Council must always assume ultimate responsibility.
11.4 Priority for Implementation
Priorities for implementation of specific actions are indicated within each strategy based on the perceived importance of and immediate value of implementing the various management actions. Priority is indicated by the ranking of each action within each strategy.
11.5 Cross Referencing with Risk Management Strategies
In accordance with the Priority Management Issue linkages identified in Table 9.3, many of the proposed Management Framework Strategies can also be linked with actions identified for each Risk Management Strategy. It may be possible for Council to optimise the implementation process by coordinating these actions. Where relevant, specific Risk Management Action codes that are relevant to Management Framework Actions have been identified.
11.6 Management Framework Strategies
Table 11.1 to 11.8 outline the proposed Management Framework Strategies that have been developed in response to each Priority Management Framework Issue.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK STRATEGIES 127 Table 11.1 Framework Strategy 1 – Regional Drainage Responsibility
Related Risk Action Implementation Cost Purpose Action Management Responsibility Number Internal Consultant Action
1 Assign responsibility for regional drainage Continue senior level discussions between Council, relevant authorities and the 4 All MPSC & MW Minister to achieve the best outcomes for regional drainage on the Peninsula.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK STRATEGIES 128 Table 11.2 Framework Strategy 2 – Interagency Communication
Related Risk Action Implementation Cost Purpose Action Management Responsibility Number Internal Consultant Action In addition to the regional drainage issue outlined previously, identify and allocate responsibility for actions relating to stormwater management in each of the following organisations: · Environment Protection Authority 1 Clarify organisational roles and responsibilities · Department of Natural Resources & Environment 4 1, 2, 4, 9, 12 Agencies & MPSC · Parks Victoria · Department of Infrastructure · Southern Rural Water · Port Phillip CaLP Board Identify opportunities for involvement and spheres of influence of the following groups in the implementation of the stormwater management plan: · Adjoining municipal Councils, Frankston and Casey Explore opportunities for other organisations to 2 · Municipal Association of Victoria 4 1, 3, 6 Agencies & MPSC contribute to the achievement of the plan’s objectives · Building Control Commission · Master Builders Association · Housing Industry Association 3 Identify a client manager within relevant agencies (particularly Melbourne Water 4 All Agencies & MPSC and EPA) and allocate liaison responsibility with the relevant Council officer. Establish a regular visiting program between agencies and Council (where one 4 Facilitate interagency links at officer level. doesn’t already exist) to allow the agency client manager to gain exposure within 4 All Agencies & MPSC Council organisation and discuss matters with Council on a regular basis Encourage agencies to make available or prepare a position and skills register. The 5 register should include contact details, roles and responsibilities and will need to be 4 All Agencies & MPSC regularly updated and circulated throughout council. Regularly prepare and distribute a bibliography of new information available from 6 each agency, including where the documents are held, how they can be accessed and 4 All Agencies & MPSC Ensure effective dissemination of information a brief outline of what they contain and when/how they might be useful. 7 between organisations Update Council websites to include links to the various organisations. 4 All Agencies & MPSC 8 Collate monitoring data from external organisations in relation to waterway quality 4 All Agencies & MPSC (incident logs, annual reporting and audits).
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK STRATEGIES 129 Table 11.3 Framework Strategy 3 – Strategic Direction
Related Risk Action Implementation Cost Purpose Action Management Responsibility Number Internal Consultant Action
1 Review Council’s Community Plan with a view to including recommendations of 4 All MPSC Review Council’s Community Plan to consider Appendix F in Volume 3. stormwater management Refer to the SWMP and express commitment to achieving improved stormwater 2 4 All MPSC management outcomes. 3 Review Council’s Municipal Strategic Statement to Review MSS with a view to including recommendations of Appendix F in Volume 4 All MPSC better address to stormwater management 3. 4 Amend existing local policies to give statutory effect to the SWMP All MPSC Review Council’s Local Policies to better address to 4 5 stormwater management Develop and implement a Regional Stormwater Drainage Policy – this has the 4 All Regional Drainage potential to become an important tool and should be considered as a priority. Authority 6 Review existing Outline Development Plans and identify the need for new ones. 4 3 MPSC Update the Planning Scheme Include Best Practice Environmental Management Guidelines for Urban Stormwater 7 All MPSC on Schedule to Clause 81 as an Incorporated Document to the Scheme. 4 Council should maximise the findings, outcomes and/or recommendations of the Urban Stormwater Best Environmental Practices Guidelines (1999) and its own SWMP when reviewing or preparing new documents. Specifi c Areas to consider include: 8 · Introduction of suburban design and layout guidelines; 4 3, 5, 6, 7,10 MPSC Insert cross strategy links when revising existing · Public open space buffers along waterways; strategic documents or policies and when developing · Site development and construction practices; new strategies or policies. · Landscaping species; and · Protection of waterway values and flood plain areas Council should ensure clear links between strategies to highlight the value that one action may have on outcomes highlighted elsewhere (i.e. related strategies might 9 4 All MPSC include Urban Design Guidelines, Litter Strategy, Conservation Strategy, Environmental Management Systems,)
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK STRATEGIES 130 Table 11.4 Framework Strategy 4 – Inter-Departmental Communication and Officer Education
Related Risk Action Implementation Cost Purpose Action Management Responsibility Number Internal Consultant Action Prepare a position and skills register with relevant contact details, roles and 1 responsibilities. This document should be updated annually and be stored on the All MPSC Documenting and utilising the existing knowledge 4 intranet. base within Council Following the development of the skills register knowledge gaps should be identified 3 4 All MPSC and form the basis for the development of a staff training program. Develop a series of workshop/information sessions to launch the stormwater management plan within the organisation. These workshops provide an opportunity 4 All MPSC to outline the existing stormwater management system and highlight where changes 4 will be made. Develop an ongoing program of forums or workshops to enable the sharing of 5 knowledge and experiences from both within the organisation and from outside 4 All MPSC Equip Council officers with the skills they need to sources (such as guest speakers from other municipalities or agencies). achieve the stormwater management plan objectives Arrange site visits for staff to demonstrate various stormwater systems including 6 examples where stormwater management practices and or tools have been 4 All MPSC implemented or used successfully and where they have failed. Develop an education program for Enforcement Officers highlighting existing tools (local laws, Litter Act) available to them in relation to stormwater management 7 4 All MPSC practices; educate to recognise potential threats on the field that require referral to other authorities. 8 Develop practices that reflect Councils leadership Develop a set of designs, standards and/or operations that improve stormwater 4 All MPSC role in stormwater management. management outcomes with respect to Council’s own activities. Require Environmental Management Plans as appropriate for Council contracts and 9 4 All MPSC program activities. Encourage continued informal communication To communication between officers from different departments and offices between Council departments. introduce a system of regular meetings such as quarterly lunch meetings. These 10 meetings could be used to hold seminars about different departments activities or 4 All MPSC discuss particular issues relating to ongoing programs or specific issues such as a planning application.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK STRATEGIES 131 Table 11.5 Framework Strategy 5 – Referral Process and Planning Permits
Related Risk Action Implementation Cost Purpose Action Management Responsibility Number Internal Consultant Action 1 Develop a flow chart illustrating the referral process both internally and externally. 4 MPSC 2 Develop a checklist including examples of typical triggers that demonstrate when 4 MPSC and why a referral is appropriate and to which department or authority. Develop an induction program for new officers to outline organisational structure, Streamline the system of referrals both within internal and external referral mechanisms, unique characteristics of drainage and 3 MPSC Council and externally. stormwater on the Peninsula and Council goals and tools in relation to stormwater 4 management. Work with authorities to ensure that referrals from Council, when made, are explicit 4 in the feedback they require from that authority to avoid incomplete responses and 4 MPSC & Agencies the possible omission of relevant permit conditions. Review standard permit conditions with relevant authorities and enforcement officers to: ensure plain English is used in order to make them easily understood 5 · 4 MPSC · ensure they are worded to achieve the desired outcomes Review standard permit conditions. · ensure they are worded to enable measurable and/or quantifiable conditions that are enforceable 6 Develop a standard permit condition relating building sites, litter cages, sediment 4 3, 6 MPSC runoff, and so on. Review internally applied standard conditions to ensure they reflect Best Practice 7 4 3, 6 MPSC Environmental Management Guidelines for Urban Stormwater (1999). Requirements the development of an Environmental Management Plan (EMP) for all subdivision developments. The EMP should include reference to the impact of the development on stormwater quality and detail how construction site and ongoing 8 Review statutory planning permit requirements. 3, 6 MPSC impacts will be mitigated. The EMP would form the basis for setting development conditions and would include an inspection and audit program to check compliance with the EMP Develop a package of best practice guidelines and standard drawings for issue on 9 new applications (could be developed in conjunction with the FACTfile information 4 MPSC Encourage best practice through the planning permit sheets). application phase of a proposal. Highlight issues and options in relation to stormwater when pre-application meetings 10 are held to improve the understanding of stormwater issues and outline requirements 4 MPSC for improved stormwater management.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK STRATEGIES 132 Table 11.6 Framework Strategy 6 – Resourcing and Plan Implementation
Related Risk Action Implementation Cost Purpose Action Management Responsibility Number Internal Consultant Action Assign responsibility for the implementation of the stormwater management Plan to an appropriate Council manager. During the development of the SWMP, 1 4 All MPSC Infrastructure and Physical Services was nominated as the most appropriate group to undertake this role. Appoint an individual who is assigned responsibility for the implementation of 2 SWMP. This position is outlined in Chapter 12 and would be broadly responsible 4 All MPSC for day to day activities associated with the plan. Establish a Stormwater Management Coordinating Committee within Council that Assign accountability within Council for the would include: implementation of the stormwater management plan, · to be chaired by the accountable manager; utilising existing resources. · to include members of the existing stormwater management plan Steering Committee but to be broadened to include representation from across Council disciplines (such as strategic planning and communications); and 3 4 All MPSC · Agency representatives. The role of the Committee is to · implementation and monitoring of the SWMP; · monitor involvement of agencies; · regularly report activities and implementation progress to Council; and · prepare an Annual Review of SWMP progress. 4 Appoint additional enforcement staff to undertake to site inspections of building and 4 6 MPSC construction sites. Expand resource base to facilitate the Appoint a specialist drainage engineer and/or a drainage infrastructure section to implementation of the stormwater management plan. liaise between departments and keep updated information in relation to stormwater 5 4 MPSC and other drainage matters. A key aspect of this role would be the commenting on planning applications and approvals
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK STRATEGIES 133 Table 11.7 Framework Strategy 7 – Community Communication, Education and Local Laws
Related Risk Action Implementation Cost Purpose Action Management Responsibility Number Internal Consultant Action Launch the stormwater management plan to the community through a series of 1 information sessions. This process will be facilitated by utilising existing local 4 All MPSC community and friends groups. Raise community awareness of Council’s stormwater Provide regular community updates outlining the status of the plan and MPSC objectives. 2 achievements resulting from its implementation through existing community 4 All information vehicles such as Peninsula Wide. 3 Dedicate part of the Council’s website to stormwater management. 4 All MPSC Develop a series of stormwater FACTfile information sheets that may include: MPSC · obligations of developers in meeting the objectives of the stormwater management plan (including reference to relevant local laws and statutory Encourage community behaviour that contributes to controls) 4 meeting the objectives of the stormwater 4 All management plan. · best practice measures and/or design standards for application by industrial, commercial and rural land uses in achieving stormwater objectives · ways for the community to contribute to improved stormwater outcomes on a day to day basis 5 Encourage monitoring of waterways and ‘hot spots’ Provide a system of reporting on local waterway conditions to Council and 4 All MPSC by the community. encourage the use of existing reporting mechanisms (such as via the EPA). 6 Enforce local laws as consistently and regularly as possible. 4 MPSC Review local laws and maximise opportunities to integrate stormwater management 7 MPSC Use local laws in conjunction with education actions. 4 programs. Consider using local laws tied to Environmental Management Plans to affect MPSC 8 business and industry operations such as materials storage, waste management and 4 3, 6 sediment and erosion control.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA MANAGEMENT FRAMEWORK STRATEGIES 134 Table 11.8 Framework Strategy 8 – Drainage System Documentation
Related Risk Action Implementation Cost Purpose Action Management Responsibility Number Internal Consultant Action Review existing mapping and flooding data for the Peninsula, from both within 1 Council and from external agencies such as Melbourne Water, and develop a single, MPSC Ensure sufficient mapping data is available for the 4 digitalised mapping system. implementation of the SWMP. During the revision of Physical Infrastructure Maintenance Contract, ensure Council 2 4 MPSC retains ownership of data collected regarding its assets.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PLAN IMPLEMENTATION AND REVIEW 135
12 PLAN IMPLEMENTATION AND REVIEW
The ultimate effectiveness of this Stormwater Management Plan will be dependent on Council’s ability to implement the recommendations of the plan and progressively review its effectiveness.
This Chapter of the Plan provides recommendations to assist Council with the implementation and ongoing review of the Plan. A framework for the implementation of the plan is provided along with guidance on how Council can consistently review its effectiveness.
12.1 Implementation Approach
12.1.1 Implementation Framework and Participation
One of the key reasons for involving internal and external stakeholders in the development of the Stormwater Management Plan was to ensure that stakeholders would commit to the implementation of the Plan. Stakeholder involvement was provided throughout the course of the study via the Project Working Group. In this regard, it is considered that the continued involvement of organisations represented on the Project Working Group is critical to the effectiveness of the Plan. To ensure that key stakeholders represented on the PWG (including Council) maintain a role in the implementation of the Plan, this subsection outlines a management/coordination framework for participation during the implementation phase.
It is important that the implementation framework reflects the nature of recommendations made within the Plan. As discussed previously, these recommendations relate to: · Amendments to Council’s Planning and Management Framework (Chapter 11); and · Reactive Management Strategies (Chapter 10).
To enable the implementation of these actions it is proposed that Council clearly define internal roles for specific individuals and Council Departments. The following individual and group roles are recommended in this regard: · Accountable Manager – The accountable manager will be responsible for overseeing the implementation of the Stormwater Management Plan and managing budgetary and resourcing aspects of the plans implementation. The Accountable Manager should be an individual who is currently at Executive Level within the organisation. · Environmental and Stormwater Management Coordinator (ESMC) – it is considered essential that Council identify an individual within the organisation (or create a position) who is assigned the specific responsibility of coordinating environmental and stormwater management activities. The person in this position would be responsible for day to day activities associated with implementing “on the ground” activities. This person would report to the Accountable Manager who has been identified as the accountable person at a senior level for implementation of the plan. · Stormwater Management Coordinating Committee (SMCC) – a committee of between 4 to 6 people should be formed to oversee and coordinate the progressive implementation of the Reactive Management Strategies and Management Framework Strategies. This committee should
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PLAN IMPLEMENTATION AND REVIEW 136
be based on the Steering Committee used to manage the development of the SWMP and include representatives from Executive level representation via the Accountable Manager, engineering, planning operations the EPA and MW. The committee would liaise with the Environmental and Stormwater Management Coordinator, providing support and guidance where necessary. The committee would also participate budget programming to ensure that stormwater management activities were appropriately funded. It is envisaged that the committee would meet on a monthly basis with the ESMC to review progress on the implementation of activities relating to Subcatchment Management Strategies. The committee would be chaired by the Accountable Manager. The SMCC would also report every 6 months to the PWG on implementation progress. · Project Working Group (PWG) – it is recommended that the existing PWG be maintained throughout the implementation of the Plan to provide a review role for the activities of the Coordinating Committee and the ESMC. It is important that the PWG provide continued input regarding the implementation of the Plan and are used to disseminate information and progress arising from the implementation process.
12.1.2 Optimising Implementation Efficiency
A number of the specific recommendations in the various Reactive Management Strategies and Framework Management Strategies are closely related or could be applied generically across the entire municipality.
Opportunities exist to maximise the implementation efficiency for such actions by adopting an implementation approach that integrates the various recommendations, rather than considering them in isolation. A more efficient approach to implementing these recommendations will save Council money and will enable the recommendations to be implemented over a much shorter timeframe. The following subsections discuss specific types of actions that can be implemented by adopting an integrated approach.
Long Term Individual and Organisational Consultation
Ongoing and regular consultation with individuals, groups and external authorities has been identified as a consistent theme in many of the strategies. In each instance an estimate of cost associated with annual consultation is provided for each separate activity as part of each strategy. The most efficient approach for carrying these consultation and liaison activities would be to assign (or appoint) an individual within Council with the responsibility for carrying out recommendations as part of all strategies. The specific consultation actions and objectives identified as part of each strategy should be used as a basis for defining this role.
Depending on workload commitments, the consultation role could be carried out by the Environmental and Stormwater Management Coordinator (ESMC). However, if the strategy consultation role is to be included, it is likely that the ESMC will need to be created as a full time position.
Literature and Guideline Production
Many of the Reactive Management Strategies have recommended the development of targeted literature and guidelines. In several instances similar material is required in several strategies, e.g. the management of septic tanks and agricultural areas, or could be applicable across the entire
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PLAN IMPLEMENTATION AND REVIEW 137
municipality, e.g. runoff from residential areas, commercial premises and building sites. It is considered that economic efficiencies may be gained by commissioning the development one set of guidelines for each landuse or threat and then applying it across the entire municipality.
Media Releases
Many of the strategies involve the release of information via local print media. This includes publicising the development of the Stormwater Management Plan, the role the public can play in reporting stormwater pollution incidences, participation in Friends groups and reducing the pollutant loads generated from residential areas. It is suggested that these programs be coordinated so that a number of media releases are made, highlighting a range of issues over an extended period of time. It is suggested that this approach will have the most impact on changing the public perception of stormwater management.
Modification of Council Documents
A number of the Management Framework Recommendations recommend the modification or amendment of Council documentation. Modifications to key documents, including the MSS and Council’s Technical Specifications, should occur as part of the next scheduled revision.
12.2 Priorities For Implementation
Each of the proposed Subcatchment Management Strategies and Management Framework Recommendations have included suggested priorities or ranking for implementation. These priorities have been formulated to guide Council in the implementation of the Plan.
12.2.1 Management Framework Recommendations
Priorities which have been identified for Management Framework Recommendations reflect the proposed order in which specific amendments to the framework should be undertaken. It is recommended that Council should adopt an approach of progressively implementing these recommendations as a matter of necessity. Excessive delays in their implementation will limit the long term ability of Council’s Framework to deal with future threats, requiring unnecessary and avoidable expenditure on reactive measures in the future.
12.2.2 Reactive Management Strategies
It is envisaged that Council will adopt a certain degree of flexibility in selecting and implementing various elements proposed as part of Reactive Management Strategies. This will need to reflect the nature of the decision making and funding process within Council. The evolving regional drainage management responsibility across much the municipality will also have a significant impact on the resources available to implement the SWMP.
However, it is recommended that the first activity of the Stormwater Management Coordinating Committee will be to prepare a detailed schedule for Management Strategy implementation based on the recommendations in Chapter 10. The detailed schedule should be reviewed and updated on an annual basis in accordance with budget planning activities. The following guidelines have been
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PLAN IMPLEMENTATION AND REVIEW 138
recommended for preparing implementation schedules and ultimately implementing the recommendations of the Plan: · Budget allocation and scheduling should seek to implement large cost items within the next 3 years to maximise Council’s opportunities for funding contribution from VSAP; · Where possible similar recommendations should be coordinated to maximise economic efficiency · Priority for the selection of individual elements should be given to any elements which are identified as providing an immediate response to a current threat; and · Budget allocation should aim to achieve a balance between structural and non-structural elements.
12.3 Implementation Monitoring and Review Process
As part of the development of a detailed implementation schedule, Council should identify specific milestones and objectives which enable benchmarking and review of the implementation process. These milestones should relate to: · achieving improvements in specific receiving values which are currently threatened; or · reductions in specific risks.
The identification of these milestones should reflect the priority of the specific risk.
Performance of the Stormwater Management Plan in achieving the key milestones should be based on an annual review of specific Risks. This review should consider: · changes to the magnitude and exposure of specific threats in accordance with the implementation of management measures; and · improvements to the quality of receiving values associated with implementation of management measures.
The review process will have to have a high degree of flexibility to accommodate the changing nature of stormwater management within the municipality in the coming years. Many strategies recommend the development of further strategies to either better quantify the causes of issues or to provide a more detailed management solution than can be provided by the SWMP. It would therefore be expected that as these investigations are completed new management priorities and programs will be identified. The review and implementation process will have need to include mechanisms to incorporate and prioritise the new management actions.
12.4 Funding and Budget Allocation
The successful implementation of the Stormwater Management Plan will require a substantial funding commitment from Council. The final selection of this funding value should enable the complete implementation of all strategies identified in the Plan within a realistic timeframe (say 10 years).
To assist local authorities in the implementation of Stormwater Management Plans the State Government have announced a funding commitment of $22.5Million as part of the Greener Cities Program over the next three years.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA PLAN IMPLEMENTATION AND REVIEW 139
The process for the application and distribution of funding is currently being finalised. However, it will be necessary for Council to demonstrate that they have a clear plan (ie. a Stormwater Management Plan) which defines how they intend to manage stormwater in their municipality. In addition, if Council can demonstrate a financial commitment to the implementation of their Stormwater Management Plan, it is likely that Council will be better positioned to receive matched financial contributions from Sate Government.
In accordance with this, it is strongly recommended that Council should strongly commit to and “fast track” the implementation of the SWMP to capitalise on the available funding opportunities.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA CONCLUSIONS 140
13 CONCLUSIONS
Mornington Peninsula Shire Council’s Stormwater Management Plan provides a basis for Council to manage stormwater using Best Practice and protect the communities enjoyment of the region’s natural and built assets now and into the future. The plan establishes Council’s objectives for improving stormwater quality by clearly defining the receiving environmental assets which are valued by the community. In addition, the Stormwater Management Plan provides a sound basis for Council to apply and secure funding from external sources (eg. the Greener Cities Program) for implementation of the various strategies recommended in the Plan.
The Stormwater Management Plan has been developed with the involvement of a Project Working Group whose members include Council Staff from various departments and levels of the organisation. In this regard, the Plan has been developed to reflect the specific requirements of Council and the practical implications of applying the various strategies and recommendations. Council’s continued commitment to the implementation of Plan will be critical to its success and final effectiveness.
While the Plan provides many reactive strategies and recommendations to address current stormwater threats, it also identifies many opportunities for Council to integrate practices throughout its day to day planning and management activities. Adoption of these recommendations, accompanied by ongoing reviews will help to secure the protection of receiving environmental values for years to come. The final success of the Plan relies of Council’s ability to embrace and implement its recommendations so that stormwater management becomes an integrated and seamless part of Council’s management framework.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA REFERENCES 141
14 REFERENCES
Chapter 4 provides a comprehensive list of the reference documents used to develop the Mornington Peninsula Shire Council Stormwater Management Plan.
W:\M00215.NS.MPSCSWMP UPDATE\FINAL VERSIONS\R.M00215.001.02.MPSCSWMP.VOL2.NS.DOC
OCEANICS AUSTRALIA