Vol-2E App-N Surface-Water

Chapter: Vol 1C Chapter 16 Soil and water quality

Appendix Vol 2E App N Surface Water

Hi-res pdf: New M5 EIS Vol 2E App N Surface Water.pdf

Low-res pdfs:

Section Pages
  Glossary of terms and acronyms i
  Executive summary vii
1.0 Introduction 1
1.1 Overview of WestConnex 1
1.2 Overview of the project 2
1.3 Project location 4
1.4 Secretary’s Environmental Assessment Requirements (SEARs) 4
1.5 Study area 6
1.6 Report structure 7
2.0 Statutory and policy context 9
2.1 Australian and New Zealand Guidelines for Fresh and Marine Water Quality (ANZECC/ARNCANZ, 2000) 9
2.2 NSW Water Quality and River Flow Objectives 9
2.3 Managing Urban Stormwater – Soils and Construction 9
2.4 Managing Urban Stormwater – Environmental Targets 10
2.5 Botany Bay and Catchment Water Quality Improvement Plan 10
2.6 Floodplain Development Manual 11
2.7 Floodplain Risk Management Guideline – Practical Considerations of Climate Change 11
2.8 Other policies and guidelines 11
3.0 Methodology 13
3.1 Desktop analysis 13
3.1.1 Compilation of relevant information 13
3.1.2 Review of previous studies 13
3.1.3 Review of baseline data 17
3.2 Field assessment 17
3.3 Assessment of potential flooding and drainage impacts 17
3.3.1 Overview 17
3.3.2 Flooding during construction 17
3.3.3 Flooding during operation 18
3.4 Assessment of potential water quality impacts 18
3.4.1 Water quality during construction 18
3.4.2 Water quality during operation 18
3.5 Assessment of potential geomorphology impacts 20
4.0 Existing environment 23
4.1 Soil landscapes 23
4.2 Catchments and watercourses 27
4.2.1 Cooks River catchment 27
4.2.2 Wolli Creek catchment 28
4.2.3 Alexandra Canal catchment 33
4.2.4 Eastern Channel Catchment 40
4.3 Catchment land use 40
4.4 Geomorphology 40
4.5 Hydrology and flooding 43
4.5.1 Mainstream flooding 43
4.5.2 Localised flooding and drainage 44
4.6 Surface water quality 45
4.6.1 Wolli Creek 48
4.6.2 Cooks River 48
4.6.3 Alexandra Canal 55
4.6.4 Eastern Channel 56
4.7 Sensitive receiving environments 57
5.0 The project 59
5.1 Construction 59
5.2 Operation 60
6.0 Impact assessment – construction 61
6.1 Water extraction / use 61
6.2 Flooding and drainage 62
6.2.1 Mainstream flooding 62
6.2.2 Localised flooding and drainage 77
6.2.3 Maintenance of natural flow variability 77
6.3 Water quality 77
6.3.1 Construction water treatment plants 78
6.3.2 Wolli Creek 85
6.3.3 Cooks River 85
6.3.4 Alexandra Canal 86
6.3.5 Eastern Channel 86
6.4 Geomorphology 87
6.4.1 Wolli Creek 87
6.4.2 Cooks River 88
6.4.3 Alexandra Canal 88
6.4.4 Eastern Channel 88
6.5 Cumulative impacts 88
7.0 Impact assessment – operation 89
7.1 Water extraction / use 90
7.2 Flooding and drainage 90
7.2.1 Tunnel drainage 90
7.2.2 Localised flooding and drainage 91
7.2.3 Maintenance of natural flow variability 94
7.3 Water quality 95
7.3.1 Wolli Creek 95
7.3.2 Alexandra Canal 101
7.3.3 Eastern Channel 103
7.3.4 Cooks River 105
7.4 Geomorphology 107
7.4.1 Wolli Creek 107
7.4.2 Alexandra Canal 107
7.4.3 Cooks River 108
7.5 Cumulative impacts 108
8.0 Mitigation and management measures 109
8.1 Construction 109
8.1.1 Hydrology and flooding 109
8.1.2 Water quality 110
8.1.3 Geomorphology 111
8.2 Operation 111
8.2.1 Hydrology and flooding 111
8.2.2 Water quality 112
8.2.3 Water treatment plant discharges 113
8.2.4 Geomorphology 113
9.0 Conclusion 115
9.1 Flooding 115
9.2 Water quality 115
9.3 Geomorphology 115
10.0 References 117
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