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

NZ Transport Agency and Tauranga City Council
Mangatawa Drain Flood Bypass and TEM Stormwater AEE
1. Introduction
This report seeks consent for the proposed stormwater management activities resulting from the
construction of the Tauranga Eastern Motorway (TEM) and consent for activities resulting from Tauranga City
Councils desire to address flooding issues in the Mangatawa catchment.
Applying for The Environment Bay of Plenty consents jointly allows the New Zealand Transport Agency (NZTA)
and Tauranga City Council (TCC) to develop a solution that addressed a complex stormwater management
issue in an efficient manner. This assessment of environmental effects therefore considers the effects of all
the activities related to this project including construction.
In addition the proposal also requires District Council consents related to the proposed alteration to the
stormwater treatment pond including vegetation clearance, earthworks and discharge to the adjacent Special
Ecological Site. The bundle of regional resource consents sought is divided in the following way:
• NZTA permit holder for construction aspects;
• TCC permit holder for long term elements particularly discharges; and
• The District Council land use consent will run with the land on which the treatment pond is placed.
1.1 Background
NZTA is planning to build the TEM, as part of providing transport infrastructure for the ongoing growth of
Tauranga and the Bay of Plenty. In November 2008 the NZTA applied to the Regional Council for consents for
earthworks, water take, bridging the Kaituna River and stormwater management excluding this catchment.
The Hearing was completed on the 18th of December 2008 and a decision has been received.
TCC manages the stormwater system in urban Papamoa, and needs to reduce the frequency and magnitude
of spills from the Papamoa Hills and Mangatawa Drain into the Papamoa urban area, where there would
otherwise be a risk of inundation of many buildings in large floods.
This application seeks consent to manage the stormwater derived from the proposed motorway. NZTA and
TCC are working together to improve the reliability of the route by reducing the frequency of flood overflows
of State Highway 2 (SH2) from the Papamoa Hills and the Mangatawa Drain.
Beca has been working with both NZTA and TCC, investigating options for reducing the frequency and
magnitude of spills from the Mangatawa Drain. As this work has progressed, various options have been
considered and preferred options refined and modelled to confirm their performance.
Status: Final Page 1 April 2009
Project Number: 3932036
NZ1-1552092-Mangatawa Drain Flood Bypass and TEM Stormwater AEE