Improving the management of stormwater
North Shore City Council is currently considering options to improve the management of stormwater throughout the city.
The proposed plan changes and their associated variations were publicly notified on 12 April 2007. Submissions closed on May 18, 2007. A summary of submissions is currently being prepared for each proposed plan change.
Useful links
Public notices
A number of key issues are driving
these changes:
- North Shore City has a goal of protecting our natural environment. The current level of development in some cases threatens this goal.
- Three key Acts of Parliament – the Building Act, the Local Government Act and the
Resource Management Act all require councils to manage their environments in a more sustainable manner.
- The 13,000 hectares of North Shore City
receive an average 1250 millimetres of rain
each year. Before humans arrived here, nature
coped quite well with this rainfall. But today,
one third of the city is covered by impervious
surfaces. This area continues to increase every
year, causing an unnatural rush of water down
the natural water courses towards the beaches. This must be arrested and progressively brought back closer to the pace which nature intended.
- More people want to live in the city. That
means more buildings, roads and paths, creating more pressure on stormwater systems.
- The Council’s strategy is to prevent problems from arising rather than trying to fix them once they have occurred.
The council is taking a four pronged
approach to better management of
stormwater and the effects it has on our
city. These include:
Managing the effects of impervious surfaces
Providing a buffer between our streams and development
Avoiding development in areas at greatest risk of flooding
Better control of site works which generate sediment and other pollutants
While the issues above are addressed separately, altogether these four areas are highly inter-related and inter-dependant. Impervious surfaces will affect streams and flood areas, water running off site works will affect stream quality, and so on.
Proposed Plan changes
and associated variations
Proposed Plan Change 22 and Variations 2,3 and 4 PDF (151 KB)
Map one PDF (1.34MB)
Map two PDF (1.90MB)
Map three PDF (3.53MB)
Map four PDF (1.32MB)
Map five PDF (1.32MB)
Map six PDF (2.33MB)
Map seven PDF (1.29MB)
Proposed Plan Change 23 and Variations 5 and 6 PDF (90 KB)
Proposed Plan Change 24 and Variations 7 and 8 PDF (116 KB)
Proposed Plan Change 25 PDF (116 KB)
Section 32 report PDF (335 KB)
Stormwater management practice notes
NSC 01: Stormwater Mitigation Overview PDF (126 KB)
NSC 02: Calculating Site Imperviousness PDF (133 KB)
NSC 03: Minimising Impervious Area PDF (117 KB)
NSC 04: Permitted Activity Route for Residential Activities in SMA 1, 2 or 3 PDF (126 KB)
NSC 05: Permitted Activity Route for Non-Residential Activities in SMA 1, 2 or 3 PDF (139 KB)
NSC 06: Permitted Activity Route for Residential and Non-Residential Activities in SMA 4 PDF (140 KB)
NSC 20: Single Purpose Rain Tanks PDF (216 KB)
NSC 21: Dual Purpose Rain Tanks PDF (278 KB)
NSC 22:
Detention Tanks PDF (113 KB)
NSC 23: Bio-Retention PDF (383 KB)
NSC 25: Green Roofs PDF (127 KB)
For more information
Please contact Susan Andrews, Environmental Policy Advisor on:
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