2. Mangatawa catchment consents for earthworks, storm water ...

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NZ Transport Agency and Tauranga City Council Mangatawa Drain Flood Bypass and TEM Stormwater AEE 3. Similar spill at both Kairua and Bruce Roads Option 3 provided the best cost and hydraulic performance requiring assessment and inclusion of the requirements of the Maranui catchment. Taking into account the effects of the Maranui catchment with the preferred options alone, the following information is required: 1. Increase the Maranui swale storage capacity 2. Provide additional outlet capacity from the swale to the harbour 3. Utilise natural available storage in the Bruce Road rural area 6.1.1 Outlet and Discharge Points At present the Mangatawa/Maranui catchment flood discharge points to the Rangataua Bay are at the outlet of the Mangatawa Drain and via the Maranui wetland term. As part of the assessment, four outlet options were considered and this is shown in drawings in the attached technical report in Appendix 8. 1. Pipe the overflow north to the coast at Papamoa Beach through undeveloped land. An approximately 1.8km long large box culvert is required with potentially a new outlet to the sea. The construction and land costs along with the effects on the coast area would be unacceptable and will make this option prohibitive; 2. Pipe the flow west following the railway down the centre of Truman Lane and beyond and out to the harbour. This option would require a 2.6 km long large box culvert to the harbour. The same reasons as for the above point 1 will make this option prohibitive; 3. Maranui flood bypass: Take the overflow down Maranui swale to the culvert crossing the State Highway and add two additional pipes adjacent to an existing current Maranui culvert; 4. Mangatawa flood bypass: Leave the existing Maranui outlet as it is, and provide the overflow capacity through two pipes back to the Mangatawa drain immediately west of Mangatawa Lane. Those four options were narrowed to two principal options based on feasibility and cost, namely Options 3 and 4 above. More detailed rationale for these decisions can be found in the Options report in Appendix 8. In comparing these outlet options, the Mangatawa flood bypass had more merit overall. The positives of Option 4 are: • The required flood corridor becomes a potential area for recreation at the lower Mangatawa drain location. • Leaves more space for the treatment wetland. Status: Final Page 65 April 2009 Project Number: 3932036 NZ1-1552092-Mangatawa Drain Flood Bypass and TEM Stormwater AEE
NZ Transport Agency and Tauranga City Council Mangatawa Drain Flood Bypass and TEM Stormwater AEE • Has less effect on Special Ecological Site 13. • Lower cost overall. • Can be integrated with the MPBI development and aesthetics and use of the area and over all uses less land than other options. • Appears to fit within the riparian area shown on the MPBI development concept, so no change to the usable area of the development. The aspects where the Mangatawa flood bypass has less merit are: • Additional space is required along lower Mangatawa drain for the flood bypass. However less is required along the Maranui flood bypass. Drawings showing these works in detail are attached 3932036-ck143 to 3932036 ck146 (also Appendix 9). The Mangatawa flood bypass (Option 4) is considered to be the preferred option. Status: Final Page 66 April 2009 Project Number: 3932036 NZ1-1552092-Mangatawa Drain Flood Bypass and TEM Stormwater AEE
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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 5 - Bioresearches Report:
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APPENDIX 7 - Archaeological Assessm
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ARCHAEOLOGY B.O.P. HERITAGE CONSULT
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2 INTRODUCTION Project Background T
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4 ARCHAEOLOGICAL LANDSCAPE Previous
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6 U14/1708 & 1709 Figure 3. Cadastr
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8 Figure 6. Part ML 8133 showing Pt
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10 Hungahunga & Toroa A further ton
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12 APRIL 2008 ARCHAEOLOGICAL SURVEY
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14 Historic Places Act In addition
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APPENDIX 8 - Hydraulic Modelling: M
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Hydraulic Modelling: Mangatawa Drai
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undertake investigations into the d
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Discharge to Papamoa Beach To disch
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• Riparian planting adjacent to t
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2.2 Hydrological Assessment 2.2.1 C
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The Maranui catchment area in the m
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Table 7 - 2% AEP Storm Event Top Sp
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These results include climate chang
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3.3 Maintenance Work in Mangatawa D
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stormwater from the Maranui catchme
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Appendix A Mangatawa Drain Layout P
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Appendix C Runoff Hydrographs
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Appendix E Proposed Lower Mangatawa
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APPENDIX 10 - Drawings 3932036 ck46
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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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