Mornington Peninsula Shire Council Stormwater Management Plan Volume II
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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