The Edge Structure Plan Report Appendix 4
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Perron Developments Pty Ltd Key Close, Baldivis Local Water Management Strategy Lot 535, 559 and 579 Baldivis Rd Baldivis January 2015 Suite 1/27 York St, Subiaco WA 6008 l PO Box 117, Subiaco WA 6904 T +61 (08) 9388 2436 F +61 (08) 9381 9279 W jdahydro.com.au JDA Key Close, Lot 535, 539 and 579 Baldivis Rd Baldivis: LWMS CONTENTS 1. INTRODUCTION 1 1.1 BACKGROUND 1 1.2 STATUTORY FRAMEWORK 1 1.2.1 Regional Planning 1 1.2.2 District Planning 1 1.2.3 Local Structure Plan 1 1.3 KEY DESIGN PRINCIPLES AND OBJECTIVES 1 1.3.1 Stormwater Management Manual for Western Australia (DoW, 2007) 2 1.3.2 Better Urban Water Management (WAPC, 2008) 2 1.3.3 East Baldivis District Water Management Strategy (PB, 2007) 2 1.3.4 North-East Baldivis Flood Modelling and Drainage Studies (DoW, 2014) 3 2. PROPOSED DEVELOPMENT 5 3. PREDEVELOPMENT ENVIRONMENT 6 3.1 EXISTING LAND USE 6 3.2 TOPOGRAPHY 6 3.3 CLIMATE 6 3.4 REMNANT VEGETATION 6 3.5 WETLANDS 6 3.6 ABORIGINAL HERITAGE 6 3.7 GEOLOGY AND SOILS 7 3.8 ACID SULPHATE SOILS 7 3.9 SITE CONTAMINATION 7 3.10 SURFACE WATER HYDROLOGY 7 3.10.1 Existing Surface Drainage 7 3.10.2 Floodplain Management 7 3.10.3 Survey Details 8 3.11 GROUNDWATER HYDROLOGY 8 3.11.1 Superficial Aquifer 8 3.11.2 Leederville Aquifer 9 3.11.3 Yarragadee Aquifer 10 3.11.4 Groundwater Resources for Irrigation 10 4. LOCAL WATER MANAGEMENT STRATEGY 11 4.1 WATER BALANCE 11 4.2 WATER SUSTAINABILITY INITIATIVES 12 4.2.1 Water Supply 12 4.2.2 Water Efficiency Measures 12 4.3 WETLAND MANAGEMENT 12 4.4 STORMWATER MANAGEMENT 13 J5157y 19 January, 2015 ii JDA Key Close, Lot 535, 539 and 579 Baldivis Rd Baldivis: LWMS 4.4.1 Variation from the DWMS 13 4.4.2 Design Criteria 13 4.4.3 Local Stormwater Management 13 4.5 STUDY AREA SURFACE WATER MODELLING 14 4.5.1 Perron Land 14 4.5.2 Adjacent Land 16 4.6 GROUNDWATER MANAGEMENT 16 4.7 WATER QUALITY MANAGEMENT 17 4.7.1 Nutrient Source Controls 17 4.7.2 Land Use Change Nutrient Impacts 18 4.7.3 Irrigation Water 18 5. IMPLEMENTATION 19 5.1 URBAN WATER MANAGEMENT PLAN (SUBDIVISION) 19 5.2 MOSQUITO MANAGEMENT 19 5.3 CONSTRUCTION MANAGEMENT 19 5.3.1 Dewatering 19 5.3.2 Acid Sulphate Soils 19 5.4 STORMWATER SYSTEM OPERATION AND MANAGEMENT 19 5.5 MONITORING PROGRAMME AND CONTINGENCY PLANNING 20 6. REFERENCES 22 LIST OF TABLES Table 1: Summary of Design Principles and Objectives Table 2: Details of Groundwater Monitoring Bores Table 3: Details of DoW Monitoring Bores Table 4: Study Area Water Balance Table 5: DWMS Catchments and Allowable Discharge Rates Table 6: Land Use Runoff Parameters for XP-Storm Model Table 7: Post-Development LWMS Catchment Land Use Breakdown Table 8: XP-STORM Model Results for Detention Storage Table 9: XP-STORM Model Results for Detention Storage with Freeway Culvert Blocked TABLE 10: Minimum Specifications for Bio-Retention Systems TABLE 11: Trigger Values for Post-Development Monitoring TABLE 12: Monitoring Schedule and Reporting TABLE 13: Contingency Planning J5157y 19 January, 2015 iii JDA Key Close, Lot 535, 539 and 579 Baldivis Rd Baldivis: LWMS LIST OF FIGURES 1. Location Plan 2. Existing Land Use and Topography 3. Wetland Mapping 4. Surface Geology and ASS 5. Existing Drainage and 100yr ARI Flood Level 6. Groundwater Levels 7. Proposed Structure Plan 8. Catchment and Stormwater Management Plan 9. Bio-Retention Concept North-East POS APPENDICES A. Drainage Infrastructure Survey (MAPS, 2013) B. JDA Monitoring Bore Logs C. Water Level Monitoring Results (JDA, 2013) D. JDA Bore Water Quality Monitoring Results E. DoW Groundwater Licence (GWL176048) and Bore Construction Licence (CAW176047) F. NiDSS Modelling Results G. Landscaping Concepts (Emerge, 2014) H. Preliminary Bulk Earthwork Levels (Wood & Grieve Engineers, 2014) J5157y 19 January, 2015 iv JDA Key Close, Lot 535, 539 and 579 Baldivis Rd Baldivis: LWMS 1. INTRODUCTION 1.1 Background This Local Water Management Strategy (LWMS) has been prepared by JDA Consultant Hydrologists on behalf of Perron Developments Pty Ltd in support of the Local Structure Plan addressing the landholding of Lots 535, 559 and 579 Baldivis Rd Baldivis City of Rockingham (herein referred to as the Study Area, Figure 1). The LWMS provides the framework for the application of total water cycle management to the proposed urban structure, consistent with the Department of Water (DoW) principles of Water Sensitive Urban Design (WSUD) described in the Stormwater Management Manual (DoW, 2007). 1.2 Statutory Framework 1.2.1 Regional Planning Lots 535, 559 and 579 Baldivis Rd Baldivis are currently zoned ‘urban deferred’ under the Metropolitan Regional Scheme (WAPC, 2013). 1.2.2 District Planning The Study Area lies within the East Baldivis District Structure Plan area. The District Structure Plan has been adopted by the City and is currently with the WAPC for approval. A District Water Management Strategy (DWMS) was prepared by Parsons Brinckerhoff (2007) and accepted by Council and provides guidance on water reuse options, sizing stormwater treatment measures, water-quality related monitoring and vegetation treatments for stormwater structures. 1.2.3 Local Structure Plan This LWMS is presented in support of the Local Structure Plan (LSP) pepared by CLE (2013), as part of the Better Urban Water Management Framework. The LWMS addresses the LSP area and provides a refinement of the flood modelling, surface water management strategy and groundwater management strategy to a local scale. This LWMS is consistent with water sensitive urban design practices as described in the Stormwater Management Manual of WA (DoW, 2007). 1.3 Key Design Principles and Objectives The LWMS employs the following key documents to define its content, key principles and objectives: Stormwater Management Manual for Western Australia (DoW, 2007) Better Urban Water Management (WAPC, 2008) North-East Baldivis Flood Study (DoW, 2014) Serpentine River Floodplain Management Strategy (SKM, 2010) East Baldivis District Water Management Strategy (DWMS) (PB, 2007) A summary of the key design principles and objectives from these documents is provided in Table 1 and summarised below. J5157y 19 January, 2015 1 JDA Key Close, Lot 535, 539 and 579 Baldivis Rd Baldivis: LWMS 1.3.1 Stormwater Management Manual for Western Australia (DoW, 2007) The Water and Rivers Commission (now Department of Water, DoW) released A Manual for Managing Urban Stormwater Quality in Western Australia in 1998 to define and practically describe Best Management Practices (BMP’s) to reduce pollutant and nutrient inputs to stormwater drainage systems. The Manual also aims to provide guidelines for the incorporation of water sensitive design principles into urban planning and design, which would enable the achievement of improved water quality from urban development. The document was released to provide a guideline for best planning and management practices and was intended for use by Water and Rivers Commission, but also by other State and Local Government Authorities and sectors of the urban development industry. DoW completed a major review of the Manual in consultation with a working team comprising industry and government representatives. The revised manual was officially launched in August 2007 (DoW, 2007). Principle objectives for managing urban water in WA are stated as: Water Quality: To maintain or improve the surface and groundwater quality within development areas relative to pre-development conditions Water Quantity: To maintain the total water cycle balance within development areas relative to the pre- development conditions Water Conservation: To maximise the reuse of stormwater Ecosystem Health: To retain natural drainage systems and protect ecosystem health Economic Viability: To implement stormwater systems that are economically viable in the long term Public Health: To minimise the public risk, including risk of injury or loss of life to the community Protection of Property: To protect the built environment from flooding and waterlogging Social Values: To ensure that social aesthetic and cultural values are recognised and maintained when managing stormwater Development: To ensure the delivery of best practice stormwater management through planning and development of high quality developed areas in accordance with sustainability and precautionary principles 1.3.2 Better Urban Water Management (WAPC, 2008) The guideline document Better Urban Water Management (WAPC, 2008), focuses on the process of integration between land use and water planning and specifying the level of investigations and documentations required at various decision points in the planning process, rather than the provision of any specific design objectives and criteria for urban water management. This LWMS complies with the BUWM process. 1.3.3 East Baldivis District Water Management Strategy (PB, 2007) The East Baldivis DWMS was prepared in support of the East Baldivis District Structure Plan. The aims of the DWMS as summarised in the strategy are: 1. Define land area requirements for conveyance of flood flows and protection of future urban development from peak flood events; 2. Propose a drainage design strategy appropriate for local conditions in the strategy area that incorporates best practice water sensitive urban design measures. This strategy should identify J5157y 19 January, 2015 2 JDA Key Close, Lot 535, 539 and 579 Baldivis Rd Baldivis: LWMS Water Sensitive Urban Design (WSUD) practices to be implemented within both private allotments and the public domain, and the legal mechanisms by which all identified practices will be implemented; 3. Prescribe the design criteria for water quantity and water quality for each sub-catchment; 4. Outline the hydrologic and hydraulic framework parameters and subsequently develop the overall drainage network concept; 5. Define an implementation plan for the drainage design strategy, that will outline timing, cost estimates, mechanisms and responsibilities; and 6.