City of Greater Geelong Stormwater Management Plan Volume I Final Report
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CityCity ofof GreaterGreater GeelongGeelong StormwaterStormwater ManagementManagement PlanPlan VolumeVolume II FinalFinal ReportReport City of Greater Geelong Stormwater Management Plan Volume I Final Report Offices Prepared For: City of Greater Geelong Brisbane Denver Karratha Prepared By: WBM Oceanics Australia Melbourne Morwell Newcastle Sydney Vancouver I:\WATER\W00234.WJW.GEELONG SWMP\DOCS\PHASE 5 - REPORTING\R.W00234.001.02.COGGSWMP.VOLI.DOC 29/11/02 16:11 OCEANICS AUSTRALIA DOCUMENT CONTROL SHEET WBM Oceanics Australia Document: R.W00234.001.02.COGGSWMP.VolI.doc Melbourne Office: Title: City of Greater Geelong Stormwater Management Plan Volume I Level 5, 99 King Street Project Manager: Nick Somes MELBOURNE VIC 3000 Australia Author: Belinda Lovell Client: City of Greater Geelong PO Box 604 Collins Street West VIC 8007 Client Contact: Bruce Humphries Client Reference: 110298 Telephone (03) 9614 6400 Facsimile (03) 9614 6966 Synopsis: This report constitutes the first volume of www.wbmpl.com.au the Stormwater Management Plan developed for the City of Greater Geelong. ACN 010 830 421 REVISION/CHECKING HISTORY REVISION DATE CHECKED BY ISSUED BY NUMBER 0 12/08/02 NS BL 1 4/09/02 NS BL 2 30/11/02 NS BL DISTRIBUTION DESTINATION REVISION 0 1 2 3 4 5 6 7 8 9 10 City of Greater Geelong 1 1 1 WBM File 1 1 1 WBM Library 1 1 1 I:\WATER\W00234.WJW.GEELONG SWMP\DOCS\PHASE 5 - REPORTING\R.W00234.001.02.COGGSWMP.VOLI.DOC 29/11/02 16:11 OCEANICS AUSTRALIA CONTENTS III CONTENTS Contents iii List of Figures iv List of Tables v 1 INTRODUCTION 1-1 1.1 Why has the Stormwater Management Plan Been Developed? 1-1 1.2 What is Stormwater Pollution and Management? 1-2 2 PROCESS- HOW WAS THE PLAN DEVELOPED? 2-1 2.1 Overview 2-1 2.2 What is Risk Assessment and Risk Management? 2-2 2.3 Stakeholder Involvement 2-2 2.4 Outcomes of the Stormwater Management Plan 2-2 3 CITY OF GREATER GEELONG BACKGROUND 3-1 3.1 How is Stormwater Managed in the City of Greater Geelong? 3-2 3.1.1 Stormwater Management in Local Government 3-2 3.1.2 Existing Stormwater Management and Related Environmental Practices 3-2 3.1.3 The Role of Other Agencies in Stormwater Management 3-3 4 LOCAL STORMWATER MANAGEMENT ISSUES 4-1 4.1 Stormwater Risk Assessment 4-1 4.2 Subcatchment Breakdown 4-1 4.3 Receiving Values- What Are We Trying to Protect? 4-4 4.4 What are the Key Stormwater Threats within the City of Greater Geelong? 4-8 4.5 Priority Risk Issues 4-10 5 MANAGEMENT FRAMEWORK REVIEW 5-1 5.1 Coordination and Communication 5-1 5.2 Referrals and the Approvals Process 5-2 5.3 Resources 5-3 I:\WATER\W00234.WJW.GEELONG SWMP\DOCS\PHASE 5 - REPORTING\R.W00234.001.02.COGGSWMP.VOLI.DOC 29/11/02 16:11 OCEANICS AUSTRALIA LIST OF FIGURES IV 5.4 Council Strategic and Regulatory Documentation 5-3 5.5 Regulation and Enforcement 5-4 5.6 Education 5-4 5.7 Summary of Key Management Framework Issues 5-5 6 STORMWATER REUSE 6-1 6.1 Overview 6-1 6.2 Feeding Demand 6-1 6.3 City Of Greater Geelong’s Key Reuse Opportunities 6-2 7 WATER QUALITY MODELLING 7-3 7.1 Introduction 7-3 7.2 Pollutant Export Results 7-3 7.3 Pollutant Export Conclusions 7-3 8 STORMWATER MANAGEMENT STRATEGIES 8-1 9 MANAGEMENT FRAMEWORK IMPROVEMENT STRATEGIES 9-1 10 SWMP IMPLEMENTATION AND REVIEW 10-11 10.1 Implementation Approach 10-11 10.2 Implementation Monitoring and Review Process 10-11 10.3 Funding and Budget Allocation 10-12 11 CONCLUSIONS 11-1 LIST OF FIGURES Figure 2-1 Stormwater Management Planning Process 2-1 Figure 3-1 The City of Greater Geelong 3-1 Figure 4-1 Risk Assessment 4-1 Figure 4-2 Study Subcatchment Locations, City of Greater Geelong 4-3 Figure 8-1 Proposed GPT locations for the North Geelong Subcatchment 8-6 Figure 8-2 Recommended locations of GPTs with Oil and Grease Interceptors for the Breakwater subcatchment. 8-11 Figure 8-3 Swan Bay proposed wetland/treatment train 8-16 Figure 8-4 Location of Selected Structural Treatment Opportunities 8-19 Figure 8-5 Waurn Ponds proposed GPT 8-25 I:\WATER\W00234.WJW.GEELONG SWMP\DOCS\PHASE 5 - REPORTING\R.W00234.001.02.COGGSWMP.VOLI.DOC 29/11/02 16:11 OCEANICS AUSTRALIA LIST OF TABLES V Figure 8-6 Portarlington proposed GPTs 8-29 LIST OF TABLES Table 4-1 Study Subcatchment Descriptions 4-2 Table 4-2 Priority Risk Issues 4-10 Table 5-1 Priority Management Framework Issues 5-5 Table 8-1 Risk Management Strategy 1 – Sewer Overflow and Illegal Connections (Rippleside) 8-2 Table 8-2 Risk Management Strategy 2 – Industrial Land Use Runoff (Newcomb) 8-3 Table 8-3 Risk Management Strategy 3 – Industrial Land Use (North Geelong) 8-4 Table 8-4 Risk Management Strategy 4 – Commercial Land Use Runoff (Geelong West and Eastern Beach) 8-7 Table 8-5 Risk Management Strategy 5 – Septic and Sewer Leakage (Newcomb) 8-8 Table 8-6 Risk Management Strategy 6 – Unstable and Degraded Waterways (Clifton Springs) 8-9 Table 8-7 Risk Management Strategy 7 – Industrial Land Use Runoff (Breakwater) 8-10 Table 8-8 Risk Management Strategy 8- Land and Infrastructure Development (Municipality) 8-12 Table 8-9 Risk Management Strategy 9– Industrial Land Use Runoff (Newtown) 8-14 Table 8-10 Risk Management Strategy 10– Residential Land Use Runoff (Swan Bay) 8-15 Table 8-11 Risk Management Strategy 11- Docks and Wharves (Corio) 8-17 Table 8-12 Risk Management Strategy 12- Industrial Land Use Runoff (Rippleside) 8-18 Table 8-13 Risk Management Strategy 13- Residential Land Use Runoff (Rippleside) 8-20 Table 8-14 Risk Management Issue 14 – Major Road Runoff (North Geelong and Geelong West) 8-21 Table 8-15 Risk Management Strategy 15 – Building Site Runoff (Municipality) 8-22 Table 8-16 Risk Management Strategy 16- Residential Land Use Runoff (Waurn Ponds) 8-23 Table 8-17 Risk Management Strategy – 17 Industrial Land Use Runoff (Corio) 8-26 Table 8-18 Risk Management Strategy 18- Residential Land Use Runoff (Ocean Grove) 8-27 Table 8-19 Priority Risk Issue 19- Residential Land Use Runoff (Portarlington) 8-28 Table 8-20 Risk Management Strategy 20- Aging Infrastructure (Geelong West and Newtown) 8-30 Table 9-1 Management Framework Strategy 1 - Education 9-2 Table 9-2 Management Framework Strategy 2 - Council Guidelines 9-3 Table 9-3 Management Framework Strategy 3 – Communication 9-4 Table 9-4 Management Framework Strategy 4 - Referral Process 9-5 Table 9-5 Management Framework Strategy 5 – Community Education 9-6 Table 9-6 Management Framework Strategy 6 – Resources 9-7 Table 9-7 Management Framework Strategy 7 - Regulation and Enforcement 9-8 I:\WATER\W00234.WJW.GEELONG SWMP\DOCS\PHASE 5 - REPORTING\R.W00234.001.02.COGGSWMP.VOLI.DOC 29/11/02 16:11 OCEANICS AUSTRALIA INTRODUCTION 1-1 1 INTRODUCTION WBM Oceanics Australia was commissioned by the City of Greater Geelong to develop a Stormwater Management Plan (SWMP) for the municipality. The SWMP has been developed to guide Council 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 that is aimed at protecting and enhancing receiving environmental values and beneficial uses that are currently threatened by stormwater runoff. The Plan has been prepared in four volumes, with this report constituting Volume I. Volume I is an executive summary document, which provides a précis of the overall Stormwater Management Plan. The following information is presented in Volume II, III and IV of the plan: • Volume II provides detailed information on the approach adopted, recommendations aimed at responding to existing threats to values and suggested improvement to Council’s management framework to limit the future occurrence of stormwater threats; • Volume III provides Appendices that accompany Volume II; and • Volume IV provides a detailed assessment threats and values associated with the stormwater system. 1.1 Why has the Stormwater Management Plan Been Developed? The City of Greater Geelong’s Stormwater Management Plan has been developed to improve the environmental management of urban stormwater within the municipality. Improvements in environmental management of stormwater runoff from urban areas are necessary to meet the community’s expectations and values regarding the health and quality of local receiving environments. A number of regional management strategies and actions plans have identified urban stormwater management as a key priority for protecting environmental values within the Geelong region. In addition to this, a State Government initiative to develop Urban Stormwater Management Plans for all local authorities in Victoria has been enacted. The initiative is being conducted and partially funded as part of the Victorian Stormwater Action Program (VSAP). I:\WATER\W00234.WJW.GEELONG SWMP\DOCS\PHASE 5 - REPORTING\R.W00234.001.02.COGGSWMP.VOLI.DOC 29/11/02 16:11 OCEANICS AUSTRALIA INTRODUCTION 1-2 1.2 What is Stormwater Pollution and Management? Modification of the natural characteristics of a catchment, through processes such as urban development, has a significant impact on the nature of stormwater runoff. These changes generally manifest in modifications to the natural flow regime and the creation of a multitude of pollutant sources that can contaminate stormwater runoff. In particular, the process of urbanisation typically causes increased runoff volumes and the introduction of a variety of pollutant sources.