Application for a Water Use Authorisation for the construction of a pipeline between the Baviaanspoort Correctional Services Pump Station and the Baviaanspoort Municipal Waste Water Treatment Works Report Prepared for Department of Public Works public works Department: Public Works REPUBLIC OF SOUTH AFRICA Report Number 498454/Baviaanspoort Pipeline WUA Report Prepared by srk consulting August 2018 SRK Consulting: Project No: 498454 Baviaanspoort Pipeline WUA Page i Application for a Water Use Authorisation for the construction of a Pipeline between the Baviaanspoort Correctional Services Pump Station and the Baviaanspoort Municipal Waste Water Treatment Works Department of Public Works SRK Consulting (South Africa) (Pty) Ltd. Block A, Menlyn Woods Office Park 291 Sprite Avenue Faerie Glen Pretoria 0081 South Africa e-mail: [email protected] website: www.srk.co.za Tel: +27 (0) 12 361 9821 Fax:+27 (0) 12 361 9912 SRK Project Number 498454/ Baviaanspoort Pipeline WUA August 2018 0BCompiled by: 1BPeer Reviewed by: 3BNdomupei Masawi 5BManda Hinsch 4BSenior Scientist 6BPrincipal Scientist/Partner 7BEmail: [email protected] 2B Authors: 8BM Hinsch; N Masawi MAND/hinm 498454_20180831 R Baviaans Pipeline WUA_D_hinm August 2018 SRK Consulting: Project No: 498454 Baviaanspoort Pipeline WUA Page ii Table of Contents Disclaimer ................................................................................................................................................... vii List of Abbreviations .................................................................................................................................. viii 1 Introduction and Scope of Report ............................................................................... 1 1.1 Background and Brief.......................................................................................................................... 1 1.2 Applicant Details ................................................................................................................................. 1 1.2.1 Water Uses in terms of National Water Act............................................................................. 8 1.3 Purpose of the application and study .................................................................................................. 8 2 Location of the Project ................................................................................................. 9 2.1 General Project Area Location. ........................................................................................................... 9 2.2 Ownership of Affected Impacted Properties ....................................................................................... 9 2.3 Ownership of Adjacent Properties ...................................................................................................... 9 2.4 Land Use Zoning ................................................................................................................................. 9 3 Description of the Surrounding Environment .......................................................... 13 3.1 Regional Climate ............................................................................................................................... 13 3.2 Temperatures .................................................................................................................................... 13 3.3 Rainfall .............................................................................................................................................. 13 3.4 Wind .................................................................................................................................................. 14 3.5 Evaporation ....................................................................................................................................... 14 3.6 Soils .................................................................................................................................................. 15 3.7 Geohydrology .................................................................................................................................... 15 3.7.1 Geology and structural geology ............................................................................................ 15 3.7.2 Detailed Geology ................................................................................................................... 15 3.7.3 Transported Soil .................................................................................................................... 16 3.7.4 Bedrock ................................................................................................................................. 16 3.8 Areas of Conservation Importance ................................................................................................... 16 3.9 Geotechnical Status .......................................................................................................................... 16 3.10 Water Resources .............................................................................................................................. 18 3.10.1 Surface Water Resources ..................................................................................................... 18 3.10.2 Mean Annual Runoff (MAR) .................................................................................................. 20 3.11 Floodlines and Hydrology ................................................................................................................. 20 3.11.1 Results Findings of the Floodline Study ................................................................................ 20 3.12 Surface Water Quality ....................................................................................................................... 21 3.12.1 Ecological Status of the Upper Pienaars River ..................................................................... 25 3.12.2 Drivers of Change (Department of Environmental Affairs and Tourism, 2005) .................... 25 4 Description of the project .......................................................................................... 27 5 Construction ............................................................................................................... 29 5.1 Access ............................................................................................................................................... 29 MAND/hinm 498454_20180831 R Baviaans Pipeline WUA_D_hinm August 2018 SRK Consulting: Project No: 498454 Baviaanspoort Pipeline WUA Page iii 5.2 Water for construction purposes ....................................................................................................... 29 5.3 Power ................................................................................................................................................ 29 5.4 Sanitation .......................................................................................................................................... 29 5.5 Contractors Camp and Laydown Area .............................................................................................. 29 5.6 Materials Handling ............................................................................................................................ 29 5.6.1 Stockpiles of Raw Materials .................................................................................................. 29 5.6.2 Fuel Display ........................................................................................................................... 29 5.6.3 Construction Materials ........................................................................................................... 29 5.7 Employment and Occupational Health and Safety ........................................................................... 30 5.8 Construction Methodology for the Pipeline ....................................................................................... 30 5.9 Maintenance ...................................................................................................................................... 30 6 Risk Assessment and Mitigation............................................................................... 31 6.1 Approach and Methodology .............................................................................................................. 31 6.2 Risk Assessment Results ................................................................................................................. 33 7 Management Plan ....................................................................................................... 37 7.1 Development footprint ....................................................................................................................... 37 7.2 Vehicle access .................................................................................................................................. 37 7.3 Vegetation ......................................................................................................................................... 37 7.4 Soils and sediment ............................................................................................................................ 38 8 Rehabilitation .............................................................................................................. 39 8.1 Objectives of Maintenance