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

NZ Transport Agency and Tauranga City Council
Mangatawa Drain Flood Bypass and TEM Stormwater AEE
Comment
NZTA’s representatives have undertaken extensive consultation during the TEM process, starting with the
designation phase and continuing through to the current phase. Throughout this process, NZTA staff and
consultants have been aware of the historical and cultural importance of ancestral lands, water, sites, waahi
tapu, and other taonga to iwi and hapu affected by the Project.
As part of this application Tauranga City Council has taken part in all consultation, attended meetings and hui
to answer questions and queries regarding the Mangatawa Floodway proposal. NZTA and TCC have developed
a relationship with affected hapu and iwi and throughout the Project have listened, discussed and incorporated
iwi and hapu interests in the project. An example of this process is in the preparation of the protocol and the
intention to provide training for monitoring of earthworks for the project and the restriction of works in the
lower Mangatawa Drain as much as possible.
Water Quality -Objective 8.3.1(a):
Water quality is maintained, and where practicable enhanced, to a level sufficient to safeguard aquatic life, to
sustain the potential for water resources to be used and developed to meet existing and reasonably
foreseeable future needs, and to provide for the protection of aesthetic or cultural values associated with
water.
Comment
Water quality is maintained by the extensive use of wet swales along the proposed motorway and the swales
will be designed using the ARC TP10 as the level of treatment required. The TEM alignment will drain to a
surrounding network of swales though catch pits and pipes removing the current roadway water from the
upper Mangatawa Drain approx ch 7900. The TEM from this point drains directly into the Maranui swale and
will be treated by the enlargement of the Tauranga City Council wetland to meet this objective.
Land- Objective 6.3.1(a):
The adoption of sustainable land use and management practices.
Comment
The stormwater management system will enable the continuance of the rural and urban activities alongside the
operation of the new motorway. The floodway is designed to provide flood protection to residentially zoned
land in Papamoa. The sustainable land use practices laid out in the District Plan for residential areas require
this basic protection.
In addition the TEM Construction Management Plans will be crucial to ensuring that the construction methods
will support the life-supporting capacity of soil and protect the quality of water in the farm drains and local
streams and rivers.
Contaminated Sites -Objective 12.3.4(a):
The significant adverse effects of site contamination are avoided, remedied or mitigated.
Status: Final Page 99 April 2009
Project Number: 3932036
NZ1-1552092-Mangatawa Drain Flood Bypass and TEM Stormwater AEE