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Towards Applying a Green Infrastructure Approach in the Gauteng City-Region

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Towards Applying a Green Infrastructure Approach in the Gauteng City-Region GCRO RESEARCH REPORT # NO. 11 TOWARDS APPLYING A GREEN INFRASTRUCTURE APPROACH IN THE GAUTENG CITY-REGION DECEMBER 2019 Edited by Christina Culwick and Samkelisiwe Khanyile Contributions by Kerry Bobbins, Christina Culwick, Stuart Dunsmore, Anne Fitchett, Samkelisiwe Khanyile, Lerato Monama, Raishan Naidu, Gillian Sykes, Jennifer van den Bussche and Marco Vieira THE GCRO COMPRISES A PARTNERSHIP OF: TOWARDS APPLYING A GREEN INFRASTRUCTURE APPROACH IN THE GAUTENG CITY-REGION DECEMBER 2019 Production management: Simon Chislett ISBN:978-0-6399873-6-1 Cover image: Clive Hassall e-ISBN:978-0-6399873-7-8 Peer reviewer: Dr Pippin Anderson Edited by: Christina Culwick and Samkelisiwe Khanyile Copyright 2019 © Gauteng City-Region Observatory Contributions by: Kerry Bobbins, Christina Culwick, Published by the Gauteng City-Region Observatory Stuart Dunsmore, Anne Fitchett, Samkelisiwe Khanyile, (GCRO), a partnership of the University of Johannesburg, Lerato Monama, Raishan Naidu, Gillian Sykes, Jennifer the University of the Witwatersrand, Johannesburg, van den Bussche and Marco Vieira the Gauteng Provincial Government and organised local Design: Breinstorm Brand Architects government in Gauteng (SALGA). GCRO RESEARCH REPORT # NO. 11 TOWARDS APPLYING A GREEN INFRASTRUCTURE APPROACH IN THE GAUTENG CITY-REGION Edited by Christina Culwick and Samkelisiwe Khanyile Contributions by Kerry Bobbins, Christina Culwick, Stuart Dunsmore, Anne Fitchett, Samkelisiwe Khanyile, Lerato Monama, Raishan Naidu, Gillian Sykes, Jennifer van den Bussche and Marco Vieira December 2019 Photograph by Alastair Mclachlan Contents List of figures................................................................................................................................................................................................... iv List of maps ..................................................................................................................................................................................................... vi List of tables .................................................................................................................................................................................................... vi Glossary of key terms .................................................................................................................................................................................... vii Acronyms and abbreviations....................................................................................................................................................................... viii Acknowledgements ........................................................................................................................................................................................ ix About the authors ............................................................................................................................................................................................x Chapter 1: Introduction and overview ....................................................................................................................... 1 Christina Culwick Key points ....................................................................................................................................................................................................1 Introduction ................................................................................................................................................................................................1 Building the evidence ................................................................................................................................................................................4 Report rationale and overview .................................................................................................................................................................5 Conclusion ..................................................................................................................................................................................................8 Chapter 2: Mapping the inequity of green assets in Gauteng ................................................................................. 11 Samkelisiwe Khanyile Key points ................................................................................................................................................................................................. 11 Introduction ............................................................................................................................................................................................. 11 Assessing the distribution of green vegetation across the GCR ...................................................................................................... 13 Proximity and accessibility of parks in the CoJ .................................................................................................................................. 16 Degradation of green assets ...................................................................................................................................................................24 Discussion ................................................................................................................................................................................................ 30 Conclusion ................................................................................................................................................................................................31 Chapter 3: Sustainable urban drainage systems for informal settlements ........................................................... 33 Anne Fitchett, Lerato Monama and Jennifer van den Bussche Key points ................................................................................................................................................................................................. 33 Introduction ............................................................................................................................................................................................. 33 SUDS principles and a GI approach ..................................................................................................................................................... 34 Vegetated areas ....................................................................................................................................................................................... 37 ii Pervious areas ...........................................................................................................................................................................................43 Water storage ...........................................................................................................................................................................................49 Conclusion ............................................................................................................................................................................................... 54 Chapter 4: Green infrastructure stormwater solutions for Diepsloot, Johannesburg ......................................... 57 Anne Fitchett, Lerato Monama and Jennifer van den Bussche Key points ................................................................................................................................................................................................. 57 Introduction ............................................................................................................................................................................................. 58 Action research and adaptive co-management ................................................................................................................................. 62 Introducing SUDS into Diepsloot ......................................................................................................................................................... 64 Water quality analysis .............................................................................................................................................................................76 Discussion ................................................................................................................................................................................................ 83 Conclusion ............................................................................................................................................................................................... 85 Chapter 5: Atlas Spruit green infrastructure flood relief scheme: Costs and benefits ........................................ 89 Stuart Dunsmore, Raishan Naidu and Marco Vieira Key points ................................................................................................................................................................................................. 89 Introduction ............................................................................................................................................................................................. 90 Atlas Spruit
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