Sustaining growth. Strengthening communities. Stormwater Management Plan 2nd Edition June 2010 2 Table of Contents STORMWATER MANAGEMENT PLAN Vol 1 EXECUTIVE SUMMARY .................................................................................................................................. 7 ACKNOWLEDGEMENTS ................................................................................................................................ 11 DEFINITIONS & ABBREVIATIONS ................................................................................................................... 13 1.0 INTRODUCTION ............................................................................................................................... 15 1.1 The brief ............................................................................................................................................. 15 1.2 Methodology ...................................................................................................................................... 16 1.3 Report Structure ................................................................................................................................. 16 1.4 Agency Responsibilities ...................................................................................................................... 17 1.5 Project Team ...................................................................................................................................... 18 2.0 SWMP CONTEXT ............................................................................................................................. 19 2.1 State-wide Context ............................................................................................................................ 19 2.1.1 State Environment Protection Policies (SEPP) ..................................................................................... 19 2.1.2 Best Practice Environmental Management Guidelines for Urban Stormwater ...................................... 20 2.1.3 Victorian Stormwater Action Program (VSAP) ..................................................................................... 20 2.2 Municipal Urban Stormwater Management Plans ............................................................................... 20 2.2.1 The intent of the SWMP ..................................................................................................................... 20 2.2.2 Standard approach for the development of the plans ......................................................................... 21 2.3 The case for the Best Practice Environmental Management of Urban Stormwater .............................. 21 2.3.1 Impacts of urbanisation on receiving waters ....................................................................................... 21 2.3.2 Current best practice Stormwater Management Standards ................................................................ 24 2.4 Stormwater Management and Catchment Planning ............................................................................ 24 2.4.1 Relationship of the SWMP to Catchment Planning ............................................................................. 25 3.0 KEY OBJECTIVES FOR THE BALLARAT SWMP ............................................................................ 27 3.1 Introduction ........................................................................................................................................ 27 3.2 Guiding Principles............................................................................................................................... 27 3.3 Summary of Broad Objectives ............................................................................................................ 27 3.4 Objectives and impediments of each Broad Objective ........................................................................ 27 3.4.1 Stormwater Quality Improvement ....................................................................................................... 27 3.4.2 Protection of environmental values of aquatic and riparian ecosystems .............................................. 27 3.4.3 Integration into urban planning, design and operations ....................................................................... 28 3.4.4 Stormwater Reuse ............................................................................................................................. 28 3.4.5 Stormwater Drainage and Flood mitigation ......................................................................................... 28 4.0 EXISTING CONDITIONS ................................................................................................................... 29 4.1 Overview of catchment characteristics ............................................................................................... 29 4.2 Overall values and threats ................................................................................................................... 29 4.2.1 Values ................................................................................................................................................ 29 3 4.2.2 Threats ............................................................................................................................................... 30 4.3 Sub-catchment breakdown of values and threats ............................................................................... 31 4.3.1 Burrumbeet Creek sub-catchment ..................................................................................................... 31 4.3.2 Upper Yarrowee River sub-catchment ................................................................................................ 32 4.3.3 Middle Yarrowee River sub-catchment ............................................................................................... 32 4.3.4 Lower Yarrowee River sub-catchment ................................................................................................ 33 4.3.5 Canadian Creek Sub-Catchment ........................................................................................................ 34 4.3.6 Buninyong Township Sub-Catchment ................................................................................................. 34 4.3.7 Winter Creek Sub-Catchment ............................................................................................................ 35 5.0 PRIORITY MANAGEMENT ISSUES ................................................................................................. 37 5.1 Risk Assessment ................................................................................................................................ 37 5.2 Overall Priority Management Issues .................................................................................................... 37 5.2.1 Summary of Key Priority Management Issues on a municipality wide basis ......................................... 37 5.2.2 Summary of Overall Related Issues not addressed by this plan ........................................................... 38 5.3 Water Sensitive Urban Design ............................................................................................................ 38 5.4 Stormwater Harvesting ....................................................................................................................... 39 5.5 Sub-catchment Priority Management Issues ...................................................................................... 39 5.5.1 Burrumbeet Creek sub-catchment ..................................................................................................... 39 5.5.2 Upper Yarrowee River sub-catchment ................................................................................................ 40 5.5.3 Middle Yarrowee River sub-catchment ............................................................................................... 41 5.5.4 Lower Yarrowee River sub-catchment ................................................................................................ 42 5.5.5 Canadian Creek sub-catchment ......................................................................................................... 43 6.0 STRATEGIES..................................................................................................................................... 45 6.1 Development of Strategies ................................................................................................................. 45 6.1.1 The screening process ....................................................................................................................... 48 6.1.2 The Evaluation Process ...................................................................................................................... 52 6.1.3 Strategies ........................................................................................................................................... 54 6.2 Completed Actions from the 2002 SWMP .......................................................................................... 55 6.3 Ongoing Actions ................................................................................................................................. 56 6.4 Updated Overall Strategies on a City-wide basis ................................................................................ 56 6.5 Sub-catchment Strategies .................................................................................................................