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 into the drain performance. They produced three reports 1 and the last was after the May 2005 floods. As part of their work a MIKE11 hydraulic model was built. New Zealand Transport Agency (NZTA) has been working with TCC to find a solution which will avoid or at least reduce overflows. The aim for NZTA was to avoid if practicable the 1% annual exceedance probability (AEP) storm event overtopping and overflowing the motorway, while TCC’s aim was to reduce the volume of water that would enter the Papamoa catchment areas (Maranui Swale and the Wairakei Stream) such that the design flood level for Papamoa of 4.5m RL (Moturiki Datum), as defined in the District Plan, was not exceeded in the 2% AEP storm event. Beca was appointed to adopt the Opus hydraulic model and undertake further modelling and engineering work to investigate mitigation options, as an extension to the work they were carrying out for NZTA on the TEM. 2.4 Existing Statutory Approvals Currently there are no resource consents for the management of stormwater generated by State Highway 2 or for the Mangatawa drain discharge to the Tauranga Harbour. However the Mangatawa Drain is defined as Land Drainage canal in the Regional Water and Land Plan 2 . The TCC treatment wetland that receives stormwater from the Maranui catchment has consent for discharge which needs to be varied as part of this application. The over spill into the Wairakei catchment is currently covered by the Wairakei Catchment comprehensive consent which is currently subject to appeal. 2.4.1 TEM Designations previously gained by New Zealand Transport Agency The designated corridor for the motorway has been in place since 2004 and was designated in four parts. It consists of designations for: • Te Maunga Four Laning • Te Maunga Service Roads • Sandhurst Interchange • Tauranga Eastern Arterial. The designations are now collectively referred to as the TEM. The designations that relate to this project area are Te Maunga four laning and Sandhurst Interchange. 1 Mangatawa Drain Flood Capacity, September 2000; Mangatawa Drain Flood Capacity: Supplementary Report, July 2001; and Mangatawa Drain Flood Assessment, 29 November 2006; all produced by Opus International Consultants Ltd 2 RWLP Dec 2002, Definitions Chapter, Pg 436. Land Drainage Canal. Status: Final Page 5 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 2.5 Current NZTA Programme Work has progressed since the corridor was designated. The design of the TEM has advanced to allow NZTA to understand the potential effects and to apply for Resource Consents related to the construction of the TEM. The next step is to develop Specimen Design and Principal’s Requirements to be used in a contract specification to go to tender with. It is anticipated that if Resource Consents are gained and funding confirmed, tendering may occur in 2009 with a possible construction start in 2010. 2.5.1 TEM Design and Build Contracts For this project a design and build contract will be used, similar to that employed in the Harbour Link Project in Tauranga. A design and build contract is structured to encourage innovation and cost saving in the construction of the project. It works by establishing in contract documentation the environmental and engineering outcomes and performance criteria for the proposed project. These criteria form the limits in which the contractor must perform but allows the contractor to use their experience to suggest new and innovative methods for achieving the same outcome. It gives the necessary certainty and flexibility to the process so that the environmental, engineering and economic outcomes can be achieved whilst allowing cost savings to be made. The consent process will set the environmental bottom lines for this project that the contractor will be required to adhere to. 2.6 Current TCC Programme Territorial authorities in the Bay of Plenty Region are required to prepare Comprehensive Stormwater Consents and Management Plans for existing urban areas and areas identified for future development. The Regional Stormwater Strategy has identified 11 comprehensive catchments in Tauranga City each requiring a consent with lodgement dates from 2006 through to 2010. TCC has applied for the first of these comprehensive catchment consents (for Papamoa/Wairakei Catchment discussed in clause 2.6.1 2.6.2 below) and is currently working with Environment BOP to review the number of comprehensive catchments and prepare a revised programme for lodging the consent applications. 2.6.1 Wairakei Catchment An application for the Papamoa/Wairakei Comprehensive Catchment was lodged with Environment BOP in 2006 and is being processed in conjunction with the Papamoa East (Wairakei) Plan Change. The application has been required to consider not only the current urban area but the full urbanization of the Wairakei and Te Tumu areas over the next 50 years. The key issue has been flood management in a catchment with a limited outlet to the ocean. The long term proposal is a high level outlet to the Kaituna River to be constructed in conjunction with the commencement of the development of the Te Tumu area around 2021. In order to manage high winter water levels in the existing rural land in Te Tumu in the interim pumping excess water to the Kaituna is proposed. Status: Final Page 6 April 2009 Project Number: 3932036 NZ1-1552092-Mangatawa Drain Flood Bypass and TEM Stormwater AEE
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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:
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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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