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Report Hydraulic Modelling: Mangatawa Drain/Maranui Swale - Mitigation Options Prepared for New Zealand Transport Agency and Tauranga City Council By Beca Infrastructure Ltd (Beca) April 2009 © Beca 2009 (unless Beca has expressly agreed otherwise with the Client in writing). This report has been prepared by Beca on the specific instructions of our Client. It is solely for our Client’s use for the purpose for which it is intended in accordance with the agreed scope of work. Any use or reliance by any person contrary to the above, to which Beca has not given its prior written consent, is at that person's own risk.
Hydraulic Modelling: Mangatawa Drain/Maranui Swale - Mitigation Options Table of Contents 1 Project Description.................................................................................................1 1.1 Introduction.................................................................................................................. 1 1.2 Background ................................................................................................................. 1 1.3 Mangatawa Flood Risk and Stormwater Management ............................................... 3 1.4 Outlet Options Considered .......................................................................................... 3 1.5 Floodway Concepts..................................................................................................... 5 2 Model Studies .........................................................................................................6 2.1 Modelling Stage........................................................................................................... 6 2.2 Hydrological Assessment ............................................................................................ 8 2.3 Rainfall......................................................................................................................... 8 2.4 Hydraulic Model......................................................................................................... 10 2.5 Results....................................................................................................................... 11 3 Proposed Flood Risk Mitigation Measures ........................................................15 3.1 Increased Drain Storage............................................................................................ 15 3.2 Top Spill Stop Bank................................................................................................... 15 3.3 Maintenance Work in Mangatawa Drain ................................................................... 16 3.4 Bruce Road Barrier / Bund ........................................................................................ 16 3.5 Lower Rail Bridge Embankment Stability .................................................................. 16 3.6 Flood Bypass from Maranui to Mangatawa............................................................... 16 3.7 Lower Mangatawa Drain Works ................................................................................ 17 3.8 Sandhurst Culvert...................................................................................................... 17 3.9 Extension of Maranui Culvert .................................................................................... 17 3.10 Maranui Deepening ................................................................................................... 17 3.11 Stormwater Treatment Wetland Area........................................................................ 17 4 Conclusions ..........................................................................................................18 Appendices Appendix A – Mangatawa Drain Layout Plan Appendix B – Mangatawa Drain Layout Option 2 Appendix C – Runoff hydrographs Appendix D – Longsection of hydraulic grade line Appendix E – Proposed Lower Mangatawa Drain and Maranui treatment area Beca // 17 March 2009 // Page ii 3932036 // NZ1-1604459-15 0.15 Rev A
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Mangatawa Drain Flood Bypass and TE
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NZ Transport Agency and Tauranga Ci
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APPENDIX 1 - Drawing 3932036 ck301R
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APPENDIX 3 - Drawing 3932036 ck119
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APPENDIX 5 - Bioresearches Report:
Page 205 and 206: APPENDIX 7 - Archaeological Assessm
Page 207 and 208: ARCHAEOLOGY B.O.P. HERITAGE CONSULT
Page 209 and 210: 2 INTRODUCTION Project Background T
Page 211 and 212: 4 ARCHAEOLOGICAL LANDSCAPE Previous
Page 213 and 214: 6 U14/1708 & 1709 Figure 3. Cadastr
Page 215 and 216: 8 Figure 6. Part ML 8133 showing Pt
Page 217 and 218: 10 Hungahunga & Toroa A further ton
Page 219 and 220: 12 APRIL 2008 ARCHAEOLOGICAL SURVEY
Page 221 and 222: 14 Historic Places Act In addition
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Page 227 and 228: undertake investigations into the d
Page 229 and 230: Discharge to Papamoa Beach To disch
Page 231 and 232: • Riparian planting adjacent to t
Page 233 and 234: 2.2 Hydrological Assessment 2.2.1 C
Page 235 and 236: The Maranui catchment area in the m
Page 237 and 238: Table 7 - 2% AEP Storm Event Top Sp
Page 239 and 240: These results include climate chang
Page 241 and 242: 3.3 Maintenance Work in Mangatawa D
Page 243 and 244: stormwater from the Maranui catchme
Page 245: Appendix A Mangatawa Drain Layout P
Page 249: Appendix C Runoff Hydrographs
Page 255: Appendix E Proposed Lower Mangatawa
Page 263: APPENDIX 10 - Drawings 3932036 ck46
Page 272: APPENDIX 12 - Drawing 3932036 ck227
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Report Tauranga Eastern Motorway -
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1 Introduction This report describe
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embankment settlement rates, and th
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3.2 Construction Sequence The typic
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concrete contamination as well as s
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Pahse 1 consists of the western sec
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• Installation of Stage 2 decanti
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Appendix A Erosion and Sediment Con
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Activity Status Mangatawa Drain 1.1
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(b) Natural State (River) Water Qua
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6. Reclamation or drainage of the b
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APPENDIX 15 - Legal Descriptions of
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Path: P:\393\3932036\TGI\55_Project
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32 Harington Street PO Box 903, Tau
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32 Harington Street PO Box 903, Tau
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