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Lefevre Peninsula Stormwater Management Plan

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Lefevre Peninsula Stormwater Management Plan City of Port Adelaide Enfield Lefevre Peninsula Stormwater Management Plan Final Report 170 Greenhill Road Parkside SA 5063 | P 08 8172 1088 | www.southfront.com.au City of Port Adelaide Enfield Lefevre Peninsula Stormwater Management Plan Final Report Our Ref.: 15014‐3 Revision Date Author Details G 30 April 2018 BS, TR Final © Southfront 2018 Contents Executive Summary v 1 Introduction 1 2 Catchment Features 2 2.1 Boundary 2 2.2 Topography 2 2.3 Land Subsidence 2 2.4 Tidal Interactions 5 2.5 Rainfall 7 2.6 Infrastructure 12 2.7 Existing Land Use and Zoning 20 2.8 Land Development Potential 22 2.9 Groundwater Assessment 23 2.10 Marine Benthic Habitats 24 3 Stormwater Management Plan Objectives 29 3.1 Policy Documents 29 3.2 Stormwater Management Plan Objectives 34 4 Stormwater Drainage Infrastructure 37 4.1 Modelling Approach 37 4.2 Drainage Data 37 4.3 Catchment Parameters 39 4.4 Floodplain Mapping 44 4.5 Drainage Performance 49 4.6 Impact of Sea Level Rise 62 4.7 Existing Flood Damages Estimation 64 4.8 Flood Mitigation Strategies 68 4.9 Flood Mitigation Benefits Evaluation 84 4.10 Flood Mitigation Strategy Action Summary 87 5 Water Sensitive Urban Design 91 5.1 Receiving Waters 91 5.2 Potential Risks from Stormwater Outflows 92 5.3 Water Quality Modelling Approach 99 5.4 Baseline Scenario MUSIC Model 100 5.5 Marine Habitat Impact Assessment 101 5.6 Recommendations for Water Quality Improvement Strategy 103 5.7 WSUD Strategy 104 5.8 WSUD Strategy Action Summary 123 6 Stakeholder and Community Consultation 127 6.1 Project Steering Committee 127 Lefevre Peninsula Stormwater Management Plan for City of Port Adelaide Enfield i 6.2 Initial Community Consultation 127 6.3 Consultation on the Draft Stormwater Management Plan 127 7 Stormwater Management Plan 130 7.1 Prioritisation and Timeframes 130 7.2 Strategy Action Costs, Benefits and Priority Summary 136 7.3 Responsibilities for Implementation 136 7.4 Implications for Adjoining Catchments 137 8 References 141 Tables Table 2.1—Lefevre Peninsula Rainfall Statistics 7 Table 2.2—Lefevre IFD Data (mm/hr) 8 Table 2.3—Adjustment in IFD Values (Lefevre ARR1987 to ARR2016) 9 Table 2.4—Lefevre IFD Data (mm/hr) for Climate Change Scenario 11 Table 2.5—Stormwater Infrastructure Profile Summary 12 Table 2.6—Recently Completed Stormwater Projects 14 Table 2.7—Sample of Known Stormwater Flooding Hotspots 19 Table 3.1— City Plan 2010‐2016 Extract 30 Table 3.2—AMLR NRM 20 Year Regional Targets Extract 32 Table 3.3—Lefevre Peninsula Stormwater Management Plan Objectives 34 Table 4.1—Impervious Fraction Results 40 Table 4.2—Typical Catchment Characteristics Applied to Sub‐areas 40 Table 4.3—Bed Resistance Parameters 47 Table 4.4—Existing Underground Drains – Identified System Issues 50 Table 4.5—Critical Storm Durations for each ARI 52 Table 4.6—Flooding Hotspots 5 year ARI; Ultimate Development, Existing Infrastructure 55 Table 4.7—Pump Station ARI Capacity Standards 59 Table 4.8—Property Inundation by ARI; Ultimate Development, Existing Infrastructure 60 Table 4.9—Summary of Flooding Hotspots by Catchment 61 Table 4.10—Impact of Sea Level Rise on Receiving Water Levels 1 63 Table 4.11—Assumed ‘Improved Values’ of Flood Affected Properties 64 Table 4.12—Flood Damage Costs by Inundation Depth 65 Table 4.13—Residential Damages, Ultimate Development / Existing Drainage Scenario 66 Table 4.14—Commercial ‐ Office Damages, Ultimate Development / Existing Drainage Scenario 66 Table 4.15—Commercial ‐ Retail Damages, Ultimate Development / Existing Drainage Scenario 66 Table 4.16—Industrial Damages, Ultimate Development / Existing Drainage Scenario 66 Table 4.17—Total Damages, Ultimate Development / Existing Drainage Scenario 67 Table 4.18—Total Damages per Catchment, Ultimate Development / Existing Drainage Scenario 67 Table 4.19—Residential Damages, Ultimate Development / Upgrades Scenario 84 Table 4.20—Commercial ‐ Office Damages, Ultimate Development / Upgrades Scenario 84 Table 4.21—Commercial ‐ Retail Damages, Ultimate Development / Upgrades Scenario 84 Table 4.22—Industrial Damages, Ultimate Development / Upgrades Scenario 84 Table 4.23— Total Damages, Ultimate Development / Upgrades Scenario 85 Table 4.24—Potential Reduction to Damages 85 Table 4.25—Reduction in Damages by Catchment 86 Table 4.26—Property Inundation by ARI; Ultimate Development, Proposed Infrastructure 87 Table 4.27—Flood Mitigation Strategy Action Summary 88 Table 5.1—MUSIC Model Results; Baseline Scenario 101 Table 5.2—MUSIC Model Results; Baseline Concentrations and Loads by Catchment 102 Lefevre Peninsula Stormwater Management Plan for City of Port Adelaide Enfield ii Table 5.3—Coastal Outfalls Classified by Catchment Size 106 Table 5.4—Streetscape Bioretention System Properties 112 Table 5.5—Proposed Streetscape Bioretention System Locations 113 Table 5.6—Mersey Road Wetland Properties 115 Table 5.7—North Haven Wetland Properties 117 Table 5.8—Assumed Gross Pollutant Trap Annual Pollutant Removal Efficiency 119 Table 5.9—MUSIC Model Results; ‘Overall’ Upgrade Scenario 120 Table 5.10—MUSIC Model Results; ‘Port River’ Upgrade Scenario 120 Table 5.11—MUSIC Model Results; ‘Gulf St Vincent’ Upgrade Scenario 121 Table 5.12—MUSIC Model Results; Upgrade Scenario Concentrations and Loads by Catchment 121 Table 5.13—MUSIC Model Results; ‘Overall ‐ Climate Change’ Upgrade Scenario 122 Table 5.14—WSUD Strategy Action Summary 124 Table 7.1—Flood Mitigation Strategies MCA Criteria Performance Score 131 Table 7.2—Flood Mitigation Strategies MCA Results 133 Table 7.3—WSUD Strategies MCA Criteria Performance Score 134 Table 7.4—WSUD Strategies MCA Results 136 Table 7.5— Stormwater Management Plan Actions Summary 138 Figures Figure 2.1—Study Area 3 Figure 2.2—Topography 4 Figure 2.3—Areas below Highest Astronomical and Observed Tide levels 6 Figure 2.4—Lefevre Peninsula Monthly Rainfall Averages 8 Figure 2.5—Existing Stormwater Infrastructure 13 Figure 2.6—Stormwater Asset Age 18 Figure 2.7—Land Use Zoning 21 Figure 2.8—Marine Benthic Habitat Classification for the Lefevre Peninsula 25 Figure 2.9—Marine Benthic Habitat Structure and Biota of the Lefevre Peninsula 26 Figure 2.10—Seagrass and Caulerpa spp. Occurrence 28 Figure 4.1—Carlisle Street Pump Station System and Performance Curves 38 Figure 4.2—Sample Impervious Sub‐areas 39 Figure 4.3—Estimated Increase in Directly Connected Impervious Area 43 Figure 4.4—Lefevre Peninsula TUFLOW Model Boundary 45 Figure 4.5—Drains Below Design ‘Average’ Tide Cycle (red), Klingberg Drive Catchment 63 Figure 4.6—Flood Mitigation Works Overview 69 Figure 4.7—Proposed location of Nazar Reserve Detention Basin 70 Figure 4.8—Artist’s impression of the proposed basin at Phillips Reserve 72 Figure 4.9—Proposed Carlisle Street Drainage Improvements 72 Figure 4.10—Artist’s Impression of Proposed Basin at Birkenhead Naval Reserve 74 Figure 4.11—Proposed Hargrave Street Lateral Drain Improvements 74 Figure 4.12—Existing Carnarvon Reserve Basin 78 Figure 4.13—Existing Aldinga Street Reserve; Mersey Road catchment 79 Figure 4.14—Proposed location of Charon Reserve Detention Basin 80 Figure 4.15—Proposed location of Detention Basin at Estella Street 82 Figure 5.1—Map of Habitats Within 1 km of Existing Stormwater Drainage Outfalls 92 Figure 5.2—WSUD Strategy Overview 105 Figure 5.3—South Terrace Drainage Outfall, Semaphore 107 Figure 5.4—Large Infiltration Basin, Taperoo 108 Figure 5.5—Drainage Outfalls at Semaphore South, Before and After Wave Action 109 Figure 5.6—High Groundwater Level in the Mascotte Street Retention Basin 111 Lefevre Peninsula Stormwater Management Plan for City of Port Adelaide Enfield iii Figure 5.7—Bioretention System Schematic 112 Figure 5.8—Bioretention System (Raingarden) Example 113 Figure 5.9—Location of Proposed Pump Station on Osborne Road Outfall 116 Figure 5.10—Permeable Paving Schematic 119 Appendices Appendix A Stormwater Standards Maps Appendix B Floodplain Maps – Ultimate Development, Existing Infrastructure Appendix C Floodplain Maps – Ultimate Development, Future Infrastructure Appendix D Proposed Flood Mitigation and WSUD Actions – Concept Designs Appendix E Proposed Flood Mitigation and WSUD Actions – MCA Scores Lefevre Peninsula Stormwater Management Plan for City of Port Adelaide Enfield iv Executive Summary This Stormwater Management Plan for the Lefevre Peninsula has been prepared in accordance with the requirements of the Stormwater Management Planning Guidelines (Stormwater Management Authority, 2007). This document contains: A summary of existing information relevant to the management of stormwater in the catchment; Catchment specific objectives for management of stormwater runoff from the catchment; Potential management strategies that may be used to meet the identified management objectives; Estimated costs and benefits associated with each of the strategies; and A clear definition of the priorities, responsibilities and timeframe for implementation of the Stormwater Management Plan. The Stormwater Management Plan area is 2,240 hectares and is not defined by a typical single contributory catchment area, but of numerous individual catchments that all discharge individually to either the Port River or Gulf of St Vincent. The plan boundary area is entirely within the City of Port Adelaide Enfield. The topography of the Lefevre Peninsula is characterised by undulating coastal dunes to the west and open flat low‐lying land to the east. This topography has resulted in a number of low‐ lying areas and trapped low points that are unable to be serviced by conventional gravity drainage systems, requiring the use of pumped systems and/or soakage (infiltration) systems for stormwater disposal. These low‐lying areas and trapped low points do not have a natural overflow path to the Port River or Gulf of St Vincent, and therefore stormwater flows in excess of the pump or infiltration capacity are required to pond in the road carriageway, and the ingress of flows to private property has been known to occur during large rainfall events.
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