Myall River Downs
Local Environmental Study
Contents - Volume 2 of 2
2.1 Surface Hydrology
2.2 Flood Analysis
2.3 Groundwater
2.4 Surface Water Quality
2.5 Engineering Design Parameters
3. Environmental Characteristics
3.1 Surface Hydrology and Drainage
3.1.1 Topography and Drainage
3.1.2 Modelling Parameters
3.1.3 Design Rainfall
3.1.4 Peak Flows Estimation
3.2 Flooding
3.2.1 Receiving Water Levels
3.2.2 Flooding Scenarios
3.2.3 Modelling Parameters
3.2.4 Flooding Analysis
3.2.5 Sea Level Rise
3.3 Groundwater
3.3.1 Subsurface Investigation
3.3.2 Groundwater Characteristics
3.3.3 Groundwater Chemistry
3.3.4 Aquifer Hydraulic Properties
3.3.5 Groundwater Modelling
3.3.6 Model Limitations
3.3.7 Groundwater Properties and Management Issues
3.4 Water Quality
3.4.1 General
3.4.2 Current Land Use
3.4.3 Sensitivity of Receiving Waters
3.4.4 Modelling Parameters
3.4.5 Model Calibration
3.4.6 Existing Baseline
3.4.7 Sensitivity of Receiving Waters
Figure 3-1: Existing Catchment Plan
Figure 3-6: 100 Year Flood Envelope
Figure 3-7: Actual Groundwater Contours for 19 January 2000
Figure 3-8: Model Grid of the Site
Figure 3-9: Modelled Groundwater Contours
4.1 Development Options
4.2 Qualitative Assessment of Development Options
4.3 Water Management Strategy
4.3.1 Objectives
4.3.2 Physical and Environmental Constraints
4.3.3 Conceptual Water Management Strategy
4.3.4 Construction
4.3.5 Nutrient Removal
4.3.6 Groundwater
4.3.7 Best Management Practices
4.4 Applicability of State Environmental Planning Policy 50
Figure 4-1: Potential Stormwater Management Strategy - Development Option 2
5. Performance of the Water Management Strategy
5.1 Layout Options
5.2 Hydrology
5.3 Flooding
5.3.1 General
5.3.2 Layout Option 1
5.3.3 Layout Option 2
5.3.4 Overall Performance
5.4 Groundwater
5.4.1 Groundwater Chemistry
5.5 Water Quality
5.6 Earthworks and Filling
5.7 Effects of Potential Sea Level Rise
5.8 Indicative Construction and Maintenance Costs
Figure 5-15: Steady State Modelled Groundwater Contours – Development Option 2
Figure 5-16: Transient Modelled Groundwater Contours – Development Option 2 – Dry year
Figure 5-17: Transient Modelled Groundwater Contours – Development Option 2 – Wet year
Appendices
Appendix A Existing Catchment Data
Appendix B Rational Method Calculations
Appendix C Existing Flood Levels
Appendix D Groundwater Laboratory Testing Results
Appendix E Falling Head Test Calculation Sheets
Appendix F Groundwater Model Calibration
Appendix G Generic Pollutant Removal Curves
Appendix H Catchment Data for Layout Options 1 and 2
(Above appendices are contained in One .pdf file)
