Section 3
DRAINAGE
Page
3.1
Introduction.................................................................................................... 3 - 2
3.2
Public Drainage............................................................................................... 3 - 4
3.3
Private Drainage ............................................................................................. 3 - 5
3.4
Access to Public Drainage ................................................................................ 3 - 6
3.5
Catchment Management Plans ........................................................................ 3 - 7
3.6
Capacity Analysis ............................................................................................ 3 - 8
3.7
Bedding, Laying and Cover ............................................................................ 3 - 10
3.8
Approved Materials ....................................................................................... 3 - 11
3.9
Manholes...................................................................................................... 3 - 12
3.10
Extensions and Upgrades of Public Drainage................................................... 3 - 14
3.11
Building over Public Drainage......................................................................... 3 - 15
3.12
Diverting Public Drainage .............................................................................. 3 - 18
3.13
Parallel Development Funding for Works on Public Drainage ............................ 3 - 19
3.14
Acquiring Access to Land ............................................................................... 3 - 20
3.15
Combined Sewers ......................................................................................... 3 - 21
3.16
Separation of Public Drainage ........................................................................ 3 - 22
3.17
Separation of Private Drainage....................................................................... 3 - 23
3.18
Service Connections ...................................................................................... 3 - 25
3.19
Common Private Drains ................................................................................. 3 - 26
3.20
Easements: Private Drainage on Private Land ................................................. 3 - 28
3.21
Easements: Private Drainage on Public Land................................................... 3 - 29
3.22
Easements: Public Drainage on Private and Public Land .................................. 3 - 30
3.23
Private Pump Stations ................................................................................... 3 - 31
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 1
Section 3
Drainage
3.1
Introduction
Section 3 presents issues common to both wastewater and stormwater systems
and practices. The emphasis is primarily on public systems, and how private
drainage interacts with and impacts on the public drainage system.
Key
Documents
•
•
•
•
•
•
•
•
•
Building Act 2004
http://www.dbh.govt.nz/blc-building-act
Building Regulations 1992 (and Amendments) (§ 3)
Building regulations - Department of Building and Housing
Local Government Act 1974 (and Amendments)
http://gpacts.knowledge-basket.co.nz/gpacts/reprint/text/1974/an/066.html
Local Government Act 2002 (and Amendments)
http://gpacts.knowledge-basket.co.nz/gpacts/public/text/2002/an/084.html
District Plan (Isthmus Section) (for Zonings and Land Use to MPD)
[Auckland City Council]
District Plan - Isthmus section
ACC Manual for Development Contribution Rebate Programme For
Rainwater tanks.
Development contribution stormwater rebate
Technical Publication 108: Guidelines for Stormwater Runoff Modelling in
the Auckland Region 1999 [Auckland Regional Council]
Technical publications 101-150
Code of Urban Subdivision and Development 1999 [Auckland City Council]
(Hard Copy Only)
•
•
On-Site Stormwater Design Manual 2002 [Auckland City Council]
http://www.aucklandcity.govt.nz/council/documents/onsite/default.asp
Wastewater Design Manual 2007 [Metrowater] [Hard copy only]
Draft Wastewater Pump Station Design Manual 1999 [Metrowater] [Hard
•
Foulwater Pump Station Design Manual 1989 [Auckland City Council] [Hard
•
AMIS/GIS-based Asset Records: Service Plans [Auckland City Council]
•
Flood Hazards (from Flood Hazard Mapping) refer AMIS/GIS or contact
Metrowater – Records to view hard copies of Flood Hazard Mapping
reports.
Health and Safety in Employment Act 1992 (and Amendments)
Health and Safety in Employment Act 1992 No 96 (as at 01 April 2008),
Public Act – New Zealand Legislation
Health and Safety in Employment Regulations 2003
•
•
copy only] Until this Manual is operative, it must be consulted in conjunction with:
copy only]
[Hard copy only]
•
Health and Safety in Employment (Prescribed Matters) Regulations 2003 (SR 2003/90) (as at
04 September 2007) – New Zealand Legislation.Time Series Modelling - Metrowater
Library (hard copies of Flood Hazard Mapping reports).
•
Standard Specification for Construction of Gravity Drain-pipes 2006, Version
6 [Metrowater Library]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 2
Section 3
Drainage
Key
Documents
(contd)
•
•
AS/NZS 2865:2001: Safe Working in a Confined Space
http://www.standards.co.nz/default
Site Hazard Identification and Controls: Overview – Working in a Confined
Space [Metrowater]
[Hard copy only]
•
•
•
•
•
Auckland City Council Draft Bylaws 2008
Part 6 Construction, Part 18 Stormwater Management
http://www.aucklandcity.govt.nz/council/documents/bylaw/
Plumbers, Gasfitters and Drainlayers Act 2000
Acts – New Zealand Legislation
AS/NZS 3725:2007 Design for Installation of Buried Concrete Pipes.
http://www.standards.co.nz/webshop/?action=viewSearchProduct&mod=catalog&pid=3725:2007(AS|NZS)
Standard Specification for Construction of Gravity Drain-pipes November
2006 [Metrowater] [Hard copy only]
AS/NZS 2566.2:2002
Buried flexible pipelines - Installation
http://www.standards.co.nz/default.htm
•
AS/NZS 2566.1:1998
Buried flexible pipelines - Structural design
http://www.standards.co.nz/default.htm
•
NZS 4404:2004: Land Development and Subdivision Engineering
•
Parallel Funding Policy and process flow chart
(Contact Metrowater Development Services)
http://shop.standards.co.nz/productdetail.jsp?sku=4404%3A2004%28NZS%29CADPDF
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 3
Section 3
Drainage
3.2
Public Drainage
Policy
Definition
Public drainage referred to in this section generally describes drainage networks
that:
•
•
•
•
are owned and maintained by Auckland City Council or Metrowater,
have been designed to accept expected flows as per the design criteria at
the time of construction,
are constructed by, or for Auckland City Council or Metrowater using
controlled engineering methods,
serve several sites or premises in separate ownership.
This is not an exhaustive description, and there are various technical and legal
issues which may be involved in any particular case.
Alterations and Additions
Alterations or additions to public drains must have specific Engineering Plan
Approval from Auckland City Environment’s Development Engineering (DE) who
will liaise with Metrowater as required.
Public manholes must be constructed on public land where possible.
Records
Public drainage records are held in various forms: engineering drawings,
microfiche, AutoCAD files, Electronic Data Management System (EDMS) and
AMIS/GIS systems. Refer to Auckland City Environments’ (ACE) Front-of-House
regarding access to these records systems.
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 4
Section 3
Drainage
3.3
Private Drainage
Policy
Definition
Private drainage generally describes all drainage systems constructed privately to
service a single or small number of ‘private’ developments or sites. These systems
are maintained by the respective property owners, and in most cases connect to
Auckland City Council’s or Metrowater’s public drainage system.
Responsibility
Property owners are responsible for their private drainage up to and including the
connection to the public line.
Requirements
Requirements for materials and performance for these private systems are given in
the relevant portions of the Building Act 2004, Building Regulations 1992 (Code),
Local Government Act 1974, Local Government Act 2002, Plumbers, Gasfitters and
Drainlayers Act 2000, and various Bylaws.
Auckland City Environments
Private systems are controlled through the Building Consent approval process, and
are installed to the satisfaction of Auckland City Environments’ Inspectors or
approved Building Certifiers.
Records
The private drainage records held by Auckland City Council are available from
Front-of-House at Auckland City Environments (ACE) 35 Graham Street, CBD.
These may be in the form of Electronic Data Management System (EDMS),
AMIS/GIS from site files, micro fiche cards, drainage packets, or larger scale
drainage sheets. Many older properties have only limited (and in some cases no)
information held.
Key
Documents
•
•
•
•
•
Building Act 2004
Building Regulations 1992 (and Amendments) (§ 3)
Local Government Act 1974 (and Amendments)
Local Government Act 2002 (and Amendments)
Plumbers, Gasfitters and Drainlayers Act 2000
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 5
Section 3
Drainage
3.4
Access to Public Drainage
Refer also to:
• Section 1: Overview, sub-section 1.8 Access to Public Wastewater Pipes and
Manholes.
Policy
Access and Security
Unless specifically provided for in a contract with Metrowater or Auckland City
Council, no person shall enter confined spaces within the public drainage system
(including manholes, pump stations and pipes) without prior written approval from
Metrowater. A Planned Work Permit must be obtained from Metrowater prior to
commencement of any work (including construction work, manhole entry, videoing
or cleaning). Construction work must be carried out by, or under the supervision
of a registered drainlayer or Chartered Professional Engineer and in accordance
with current Metrowater Health and Safety Policies (refer to Key Documents
below). For lifting of lids (for example, to check depths) not involving physical
access to the system, a Site Authorization Form for Metrowater Network Access is
required. The consultant or contractor must comply with Metrowater’s Health and
Safety policies as a minimum.
Potential Hazards
When entering public drains, potential hazards including (but not limited to):
traffic, gases, strong odours, slippery surfaces, cuts or abrasions, airborne and
water-borne disease, flooding, noise, falling debris or materials, flash flooding,
locked culvert systems must be considered and appropriate controls put in place to
eliminate, isolate or minimise these hazards.
In any emergency in the public drainage system or water supply system:
⇒ Dial 111
⇒ Ask for the Fire Service or Ambulance
⇒ Give your name, contact details and the full address of the emergency
For More Information
For more information regarding the Planned Work Permit or the Site Authorization
Form, contact Metrowater, Ph 624-4884.
Key
Documents
•
•
•
•
•
•
Health and Safety in Employment Act 1992 (and Amendments) (Health and
Carriageways)
Health and Safety in Employment Regulations 1995 (and Amendments)
AS/NZS 2865:2001: Safe Working in a Confined Space
Site Hazard Identification and Controls: Overview – Working in a Confined
Space [Metrowater] [Hard copy only]
Site Authorization Form for Metrowater Network Access [Metrowater]
Planned Work Permit [Metrowater]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 6
Section 3
Drainage
3.5
Catchment Management Plans
Refer also to:
• Appendix O: Integrated Catchment Study.
Auckland City Council, in partnership with Metrowater, has completed an
Integrated Catchment Study (ICS) for the Auckland City Council Isthmus area. The
ICS updated the “Type A and Type B” Catchment Management Plans in most of the
Drainage Management Areas (DMAs). Information on the Wastewater, Combined
and Stormwater systems within the ICS work includes confirmation of drainage
assets in an area, contributing sub catchment areas, existing pipe capacities, MPD
design flows, self cleansing velocities in wastewater systems and identification of
Flood Hazard Mapping (FHM) and Overland Flow Paths etc. Where catchments
were not completed during ICS (including parts of Waiheke Island) FHM reports
and maps will become available. Time Series Modelling reports are available for
most DMA’s within Auckland City.
Policy
10, 50 and 100-Year Flood Plains
10, 50 and 100-Year Flood Plains are based on Flood Hazard Mapping and include
flood plain levels at various nodes, significant Overland Flow Paths and known
surveyed habitable floor levels. If a development is in a Flood Hazard area, the
relevant engineering studies must be referred to. For access to and queries
regarding Flood Plains or Historical Catchment Management Plans, contact the
Duty Development Engineer at Auckland City Environments (ACE). Refer to
Appendix O: Integrated Catchment Studies.
Flood Risk Areas
Flood Risk Areas (formerly: ‘Type B’ Catchment Management Plans) noted on
AMIS/GIS provide an indicative assessment of areas prone to flooding. These
Flood Risk Areas are constantly under review and updated as new information
becomes available and/or flood assessments are carried out. They are only an
indication of the best information available at the time of their creation. Known
flood hazards are indicated on AMIS/GIS.
AMIS/GIS
The AMIS/GIS system shows 10, 50 and 100-Year Flood Plains and Flood Risk
Areas in its Hazards Object Group and equivalent map output. The 10, 50 and 100Year Flood Plains are identified from Flood Hazard Mapping and Catchment
Management Plans. The Flood Risk Areas are known flood risk areas and are
identified as a result of consultation with property owners and available historical
records. The flood area information is a guide only. Reference to this information
and the 10, 50 and 100-Year Flood Plains, should be made in consultation with the
Duty Development Engineer at ACE.
Key
Documents
•
•
Flood Hazard Maps (FHM’S) included in AMIS/GIS
FHM Reports and Maps [Auckland City Environments or Metrowater] [Hard
•
Flood Hazard Area formerly ‘Type A’ Catchment Management Plan)
[Auckland City Environments or Metrowater] [Hard copy only]
Flood Risk Area (formerly: ‘Type B’ Catchment Management Plan)
[Auckland City Environments or Metrowater] [Hard copy only]
Time Series Modelling - System Performance reports [Metrowater] [Hard copy
•
•
copy & PDF]
only]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 7
Section 3
Drainage
3.6
Capacity Analysis
Refer
•
•
•
also to:
Sub-section 3.5: Catchment Management Plans;
Section 5: Stormwater, sub-section 5.3: Design Standards.
Appendix O: Integrated Catchment Study
A Capacity Analysis of a receiving drainage system is required where a
development site is greater than 1,000 m2, involves four or more units or where
specifically requested as a result of a Resource Consent, Trade Waste Permit or
public drainage extension. This analysis involves a comparison of the capacities of
the particular system, combined or separate wastewater and stormwater systems
(pipes, watercourses and secondary flow paths). The applicant must obtain
sufficient data to complete the analysis. The analysis involves a comparison of the
Existing and Maximum Probable Development (MPD) flows from the relevant
catchments, including the effects of the development on both upstream and
downstream systems and an analysis of known drainage problems.
Policy
Information held by Metrowater and Auckland City Council
The Integrated Catchment Study (ICS) and later studies provide information on the
Wastewater, Combined and Stormwater systems including, confirmation of
drainage assets in an area, contributing sub catchment areas, existing pipe
capacities, MPD design flows, self cleansing velocities in wastewater systems and
identification of Flood Hazards and Overland Flow Paths etc. This information is
included in Flood Hazard Mapping and System Performance Maps for each
Drainage Management Area (DMA).
Capacity Analysis Requirements
The analysis must be carried out by a suitably qualified engineer in the field of
catchment and pipe flow analysis and must comply with the information within the
Key Documents below. Costs are to be met by the applicant.
Extent of Capacity Analysis
The analysis should be carried out for the relevant branches of the system from
the subject site to a point where the downstream system clearly has capacity for
Maximum Probable Development (MPD) flows.
Submission
Completed reports must be submitted together with the application to ACE and a
copy of the report sent to Metrowater. Infrastructure reports shall be no more than
two years old.
Under-Capacity of the Public Drainage System
Where the Capacity analysis submitted by the developer indicates the downstream
drainage system is undersized for the proposed development, the developer must
provide a detailed proposal to mitigate these effects, such as upgrading of the
existing drainage system or providing detention storage, in the case of undersized
stormwater systems. Refer Section 5.9: Stormwater Holding & Re-Use Tanks.
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 8
Section 3
Drainage
3.6 (cont)
Capacity Analysis
Policy
(cont.)
Capacity of Old Wastewater Pipes
Some of the older areas of Auckland have 100mm diameter public wastewater
pipes, especially where drainage was installed in the 1940s. Examples include
Ellerslie and Onehunga Borough. Ultimately, these drains will be upgraded. In the
meantime, connection may be made to these drains, provided a capacity check
confirms sufficient capacity is available to cater for the proposed additional flows
and the condition of the system is adequate. If the capacity of the existing public
100mm diameter is not sufficient to cater for additional flows from the proposed
development, or the condition of the public line is found to be poor, then the
wastewater pipe must be upgraded by the developer.
Key
Documents
•
•
•
•
•
•
•
•
•
•
District Plan (Isthmus Section) (for Zonings and Land Use to MPD)
[Auckland City Council]
ACC Manual for Development Contribution Rebate Programme For
Rainwater tanks.
Technical Publication 108: Guidelines for Stormwater Runoff Modelling in
the Auckland Region 1999 [Auckland Regional Council]
NZS 4404:2004: Land Development and Subdivision Engineering
Code of Urban Subdivision and Development 1999 [Auckland City Council]
On-Site Stormwater Design Manual 2002 [Auckland City Council]
Wastewater Design Manual 2007 [Metrowater] [Hard copy only]
AMIS/GIS-based Asset Records: Service Plans [Auckland City Council] [Hard
copy only]
100-Year Flood Plains (formerly: ‘Type A’ Catchment Management Plans)
[Auckland City Environments or Metrowater] [Hard copy only]
Flood Risk Areas (formerly: ‘Type B’ Catchment Management Plans)
[Auckland City Environments or Metrowater] [Hard copy only]
System Performance Maps – Time Series Modelling (Metrowater) [Hard copy
only]
•
•
Catchment Improvement Plans (since ICS) [Metrowater] [Hard copy only]
Flood Hazard Mapping Reports and Maps [Auckland City Environments or
Metrowater] [Hard copy only]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 9
Section 3
Drainage
3.7
Bedding, Laying and Cover
Refer
•
•
•
Policy
also to:
Section 4: Wastewater, sub-section 4.2: Design Standards;
Section 5: Stormwater, sub-section 5.3: Design Standards;
Section 7: Standard Drawings, 12908/102.
All Public drainage must be constructed to the standards below.
Bedding
All pipelines must be bedded, haunched and covered with suitable, compacted
granular material as shown in Section 7: Standard Drawings, 12908/102 and to
manufacturers’ specifications. All pipelines must be designed and constructed to
withstand the likely loads placed upon them throughout their service life. The load
carrying capacity must be calculated in accordance with AS/NZS 3725. Where a
pipeline or manhole is to be constructed through soft ground, the pipeline or
manhole must be adequately supported by removing the unsuitable material and
replacing it with approved material, or by way of an alternative construction
method or design consideration approved by an appropriately qualified engineer.
Laying
Pipes must be laid at a constant grade and true line between manholes except
where curved lines have been specifically approved by Development Engineering
or Metrowater.
Cover
Pipes must have at least:
• 900mm cover in private land and under footpaths;
• 1200mm cover in road carriageways.
Where minimum cover cannot be achieved, protection options maybe considered
by Auckland City Environments and Metrowater, which require specific design and
approval.
Key
Documents
•
•
•
•
•
NZS 4404:2004: Land Development and Subdivision Engineering
AS/NZS 3725:2007 Design for Installation of Buried Concrete Pipes.
Standard Specification for Construction of Gravity Drain-pipes November
2006 [Metrowater] [Hard copy only]
AS/NZS 2566.2:2002: Buried flexible pipelines - Installation
AS/NZS 2566.1:1998: Buried flexible pipelines - Structural design
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 10
Section 3
Drainage
3.8
Approved Materials
Refer also to:
• Section 7: Standard Drawings;
• Appendix R: Approved Materials for Drainage.
Policy
Materials which can be used for public drainage, and the status of these drainage
approved materials are listed in Appendix R: Approved Materials for Drainage. The
list applies to new systems and alterations to existing systems, that is, repairs or
relays and diversions. Materials used for works outside this policy will not normally
be accepted as public drainage. Changes to the current list, or acceptance of use
of material not listed can be made only by Metrowater. Materials requiring specific
Metrowater approval will only be considered for use where there are compelling
technical reasons. Material delivery delays by suppliers or poor planning by the
developer will not be a reason for Metrowater to consider alternative noncomplying pipe materials
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 11
Section 3
Drainage
3.9
Manholes
Refer
•
•
•
also to:
Section 4: Wastewater, sub-section 4.2: Design Standards;
Section 5: Stormwater, sub-section 5.3: Design Standards;
Section 7: Standard Drawings, 12908/202 to 12908/224
Manholes are provided for access into the wastewater and stormwater systems for
Auckland City Council and Metrowater and their agents.
Policy
Required Location of Manholes
Manholes must be located at the following points:
• At all junctions, ends and changes of direction, size or grade of public
drains (except as provided elsewhere for catchpit leads);
• At spacing of not more than 90m. The maximum spacing may be increased
where access is available, that is, pipes of 1800mm diameter or greater;
• To cause minimal interference with use of any land.
• In public land wherever possible.
Required Dimensions of Manholes
All manholes must be circular with minimum diameter of 1050mm. Refer to
Section 7: Standard Drawings, 12908/202 to 12908/224. All manholes in the road
reserve must have a heavy-duty concrete precast lid. Manholes in the carriageway
must be fitted with a non-rock cast iron frame and cover. Refer to Section 7:
Standard Drawings, 12908/223. Manholes connecting pipes larger than 600mm
must be specifically designed and approved.
Fall through of Manholes
Refer NZS 4404, 5.3.6.4.3 - Internal Falls Through Manholes, Table 5.8 Maximum
Allowable Deflections through Manholes and Table 5.9 Minimum Internal Fall
through pipes of the same diameter.
Where the outlet diameter is greater than the inlet diameter, the minimum fall
through of the manhole must not be less than the difference in diameter of the
two pipes, which requires pipes to be aligned soffit to soffit (internal pipe top).
Minimum internal fall through manholes (pipes of the same diameter):
• 0-30º deflection angle at manhole: 30mm
• 30-60º deflection angle at manhole: 50mm
• 60-120º deflection angle at manhole: 80mm
Mini Manholes
Chambers of 600mm diameter may be permitted as terminal manholes where:
• the line is not likely to ever be extended,
• there are no more than two inlets (diameter of inlets must not exceed 100
mm dia) and one outlet of a maximum 225 mm diameter,
• the manhole depth does not exceed 1m.
All other requirements for standard manholes must be complied with.
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 12
Section 3
Drainage
3.9 (cont)
Manholes
Policy
(cont)
Connections to Manholes
All pipe connections to manholes shall comply with standard drawings 12908/202
to 211.
Only Metrowater may approve an internal drop connection as per 12908/211.
Continuing Access
Property owners must ensure that manholes and other access points to
the Auckland City Council or Metrowater pipe systems are accessible at
all times. Manholes may not be covered over. This includes light or
temporary structures, landscaping, paving, or surrounding structures.
Key
Documents
•
•
NZS 4404:2004: Land Development and Subdivision Engineering
Standard Specification for Construction of Gravity Drain-pipes November
2006, [Metrowater] [Hard copy only]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 13
Section 3
Drainage
3.10
Extensions and Upgrades of Public Drainage
Refer
•
•
•
•
•
•
•
•
•
•
•
also to:
Sub-section 3.6: Capacity Analysis;
Sub-section 3.8: Approved Materials;
Sub-section 3.13: Funding Contributions for Works on Public Drainage;
Section 2: Development, sub-section 2.4: Testing and Acceptance;
Section 2: Development, sub-section 2.5: As-Builts;
Section 2: Development, sub-section 2.7: Additional Dwellings;
Section 7: Standard Drawings, 12908/201;
Appendix E: Declaring Existing Systems as Public;
Appendix F: CCTV Inspection Requirements;
Appendix G: Form: Vesting Assets with Auckland City Council;
Appendix R: Approved Materials for Drainage.
Extensions and upgrades to the public system and diversions of existing systems,
may be required as part of a development. Engineering Approval for construction
must first be obtained from Development Engineering (DE).
Policy
Extensions to the Public Drainage System
Extensions are required in the following situations:
• Where the system will serve more than one lot or the proposed line crosses
two boundaries;
• Where the nearest available connection to a public system is 30m or more
from the lot to be served;
• Where the nearest available connection to a public system is 60m or more
from the building to be served;
• Where future upstream catchments could be serviced. Refer to Section 2:
Development, sub-section 2.7: Additional Dwellings;
• Where three or more dwellings are proposed. Refer to Section 2:
Development, sub-section 2.7: Additional Dwellings.
Public Drainage Standards
Public drainage must be constructed to the relevant standards as presented and
referenced in this manual.
CCTV Inspection
A post construction CCTV inspection of the new public drainage is required as a
part of Auckland City Council declaring the drains public. This is normal best
practice as per industry standards. Refer to Appendix F: CCTV Inspection
Requirements.
Key
Documents
•
•
•
Code of Urban Subdivision and Development 1999 [Auckland City Council]
[Hard copy only]
Standard Specification for Construction of Gravity Drain-pipes November
2006 [Metrowater] [Hard copy only]
New Zealand Pipe Inspection Manual 2006
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 14
Section 3
Drainage
3.11
Building over Public Drainage
Refer
•
•
•
Policy
also to:
Sub-section 3.4: Access to Public Drainage;
Section 7: Standard Drawings, 12908/252 to 12908/255;
Appendix F: CCTV Inspection Requirements.
Building over Public Drains
Generally speaking, building over (or adjacent to) public drains is not normally
permitted. A dispensation may be considered where:
• The drain is in good condition (by proof of a CCTV Inspection);
• The drain has adequate capacity;
• Access, repair and maintenance aspects are satisfactory;
• Diversion of the pipe is not necessary; and
• The development will not put an additional structural load on the drain.
The definition of building includes ‘light’, ‘temporary’ or ‘slab’ structures. All
building foundations proposed within 2m of a public sewer or within a 45º load
transfer angle from 500 mm below the invert of the pipe, must comply with
Auckland City Council’s pipe bridging requirements. Refer to Section 7: Standard
Drawings, 12908/253 and 12908/254.
Building over Private Drains
Building over private drains servicing an adjacent lot is not permitted. Building
over private drains servicing buildings on the same lot may be permissible subject
to Building Consent approval.
Access to Public Drainage
Refer to Sub-section 3.4: Access to Public Drainage.
Clearances
Auckland City Council and Metrowater must always have effective access to
manholes. Refer to Section 7: Standard Drawings, 12908/254. For this reason,
nothing may be placed in the following areas:
• In the ground within 1m horizontally of the outside of a pipe or manhole
chamber; or
• Above the ground within 1m horizontally of the side of the manhole or
lamphole and within 5m vertically above the manhole lid or lamphole.
Repairs and Replacements
Any repairs required to faults within 2m of the proposed building platform will be
at the developer’s cost. Where the pipeline is of a material or construction which is
not currently approved (such as asbestos cement pipes), the entire section of the
pipeline within 2m of the proposed building platform must be replaced. Fall and
capacity checks may be required before relaying.
Consideration for Bridging Waiver
Bridging for a garage, shed, carport or veranda may be waived subject to ACE
Structural Engineers Approval. This waiver only applies where the exiting pipe
does not run parallel and directly below a perimeter strip footing.
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 15
Section 3
Drainage
3.11 (cont)
Building over Public Drainage
Policy
(cont)
The structure must:
• be constructed for normal domestic use;
• be accurately located on-site;
• be stand-alone and light timber-framed;
• have a base which inherently spreads the load (for example, a concrete slab
foundation); and
• cover between 1.2m and 6m of the pipe.
The sewer must be in good condition (by proof of a CCTV inspection).
Proposed Paving
Proposed excavations, driveways and other paving to be located over existing public
drains may require a CCTV inspection of the affected public drain and a specific
design where the pipe has less than 1.2m of undisturbed cover.
CCTV Inspections
All drainage DVD’s must follow the CCTV drainage procedures (refer to Appendix F).
When proposing to build over or adjacent to a public drain, a CCTV inspection is
required regardless of the age or depth of the drain. A post-construction CCTV
inspection of new public drainage is required for all drains, prior to Auckland City
Council declaring the drains public, this includes pipe relays. A Building Code of
Compliance and or a Engineering Completion Certificate will not be issued until the
final DVD is received and approved by ACE. ACE sends all DVD’s to Metrowater for
filing and possible audit. Refer to Appendix F, CCTV Inspection Requirements.
Accurate Location of Drainage on Site Plans
Public drains must be accurately located on-site in relation to the proposed building
works and shown on the site plans in all cases. Refer to diagram below: Sample
Plan: Works Close to Existing Public Wastewater Pipe.
CCTV of public drains post pile driving
Where pile driving is within 2-3m of a public drain, both pre- and post-pile driving
CCTV surveys shall be supplied to ACE for checking to ensure no damage has
occurred to the public drainage system as a result of the piledriving.
Format of CCTV Inspections
The CCTV inspection shall be provided to (ACE) on a DVD in accordance with the
requirements set out in Appendix F.
Key
Documents
•
•
•
•
•
•
Local Government Act 1974 (and Amendments) (esp. § 26.451)
Local Government Act 2002 (and Amendments)
Health and Safety in Employment Act 1992 (and Amendments)
Health and Safety in Employment Regulations 1995 (and Amendments)
AS/NZS 2865:2001: Safe Working in a Confined Space
Code of Urban Subdivision and Development 1999 [Auckland City Council]
(Hard Copy only)
•
•
Site Hazard Identification and Controls: Overview – Working in a Confined
Space [Metrowater][Hard copy only]
New Zealand Pipe Inspection Manual 2006
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 16
Section 3
Drainage
3.11 (cont)
Building over Public Drainage
Diagrams
Sample Plan: Works Close to Existing Public Wastewater Pipes
All pipes must be accurately located on-site.
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 17
Section 3
Drainage
3.12
Diverting Public Drainage
Refer also to:
• Sub-section 3.10: Extensions and Upgrades of Public Drainage;
• Sub-section 3.11: Building over Public Drainage.
Diversion of a public drain around a proposed building is sometimes an effective
solution. This is treated the same as any other work on public drainage and
requires an Engineering Plan Approval from ACE.
Policy
Applications
An application for an Engineering Plan Approval should be made to Development
Engineering (DE). Engineering details including the site plan and longitudinal
sections must be provided.
Capacity
The capacity of the diverted line must be adequate for the predicted future
Maximum Probable Development (MPD) design flows.
Costs
The applicant must pay all costs associated with any diversion work.
Consents from Adjacent Property-Owners
Where diversion works are required in any adjacent property, it is the applicant’s
responsibility to obtain written consent from the affected property-owners.
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 18
Section 3
Drainage
3.13
Parallel Development Funding for Works on Public
Drainage
Where Drainage and Water Supply works planned as part of a private development
can be extended to serve other upstream land and offer a ‘public’ benefit
(increased size downstream to cater for future downstream development),
Metrowater and/or Auckland City Council may consider making a contribution
towards the additional cost.
Policy
Process
A Parallel Development Fund is available for funding of extensions to public
wastewater and stormwater performed by private developers or pipe upsizing (see
Principles below). Granting of funds will be at the discretion of Auckland City
Council and Metrowater. The decision will be based on the potential benefits of
the extension to the catchment and on future development. The developer must
supply a proposal including engineering plans and three cost estimates.
Development Engineering (DE) will assess the proposal and may forward it to
Metrowater for approval. The fixed amount for the fund opens on 1 July each year
and may close when the funds have been exhausted during the financial year.
Principles
The Code of Urban Subdivision and Development states that Auckland City Council
“may make a financial contribution towards any additional works necessary” to
service other land. In practice, this might be for increased pipe sizes or extra
reticulation to service land outside the development, that is, the extra cost over
that of constructing a suitable system to service only the current development.
File Records
All development contributions or similar commitments made are to be formally
recorded and filed to the appropriate site file. This will enable Auckland City
Council to recover any funds contributed earlier for future development.
Key
Documents
•
•
•
Parallel Funding Policy and process
(Contact Metrowater Development Services)
District Plan (Isthmus Section) (esp. § 4B.6, 11.5.5.3) [Auckland City
Council]
Code of Urban Subdivision and Development 1999 (esp. § 2.15, 5.2.1,
6.2.1) [Auckland City Council]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 19
Section 3
Drainage
3.14
Acquiring Access to Land
Refer also to:
• Appendix F, CCTV Inspection Requirements;
• Appendix I, Gaining Access.
The Local Government Act 1974 (§ 460),(461) and 2002 (§ 181 (2-3)) contains
various provisions relating to access by Auckland City Council to private land in order
to carry out required drainage works. These may be considered in relation to a
specific development where it is necessary to obtain access to neighbouring private
land for private drainage, or to construct public drainage. Note that the following is
a summary only and the relevant legislation should always be referred to.
In all but exceptional cases the best solution is for the developer to conclude
satisfactory private negotiations with the relevant property owners. Refer also to
Appendix I, Gaining Access.
Policy
Private Negotiation
Auckland City Environments(ACE) role is to confirm the appropriate adjacent
landowner consents are obtained by the developer. ACE will not become involved
with conditions of consent. In all cases the developer is responsible for negotiating
and coming to a satisfactory arrangement with affected landowners. This is a private
negotiation between individuals and does not involve Auckland City Council.
Local Government Act 1974, Section 460 and 461
Where the only practical route of a new private drain is through land owned by
persons who will not consent to the drain’s construction, Section 460 of the LGA,
outlines a process where Auckland City Council may enter the land and construct
such works. The non-consenting owner will have the opportunity to be heard by
Auckland City Council and appeal to the District Court before Auckland City Council
can enter the land. Auckland City Council‘s costs are recoverable from the
developer. Clause 461 relates to the further provisions of the Local Government Act
1974 regarding private drains through adjacent properties.
Local Government Act 2002, Section 181 (2-3)
Auckland City Council may construct public drains on private land, and associated
works as it considers necessary, either with written consent of the land owner, or
following compliance with the 12th Schedule of the Act where the land owner will not
give written consent.
Auckland City Council’s Involvement
Whilst Auckland City Council may invoke Section 460 of Local Government Act 1974
or Section 181 of Local Government Act 2002, Auckland City Council will only
become involved in such situations involving private development (beyond supplying
general information on the process involved), where:
• The Developer has requested in writing that consent be given and has
received confirmation from the landowner that consent will be withheld. In
such situations the developer must supply all details of contact made,
including copies of letters, plans and any alternative options available;
• Where the proposed works are the optimum engineering solution;
• Where the development proposed complies with the District Plan provisions.
• Where ACC believe it provides a justifiable ‘public benefit’ to do so.
Key
Documents
•
•
Local Government Act 1974 (and Amendments) (§ 460) (§ 461)
Local Government Act 2002 (and Amendments) (§ 181, 12th Schedule)
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 20
Section 3
Drainage
3.15
Combined Sewers
Refer
•
•
•
also to:
Sub-section 3.17: Separation of Private Drainage;
Section 5: Stormwater, sub-section 5.2: Approved Discharge Points;
Section 5: Stormwater, sub-section 5.9: Stormwater Holding and re-use
Tanks.
The combined sewer system provides a single point of connection to each property
for disposal of stormwater and wastewater in the same pipe.
Policy
New Combined Public Sewers
No applications for new combined public sewers will be considered or approved.
Connections to Combined Public Sewers
Generally speaking, no new combined connections will be approved. However,
dispensation may be granted in the event that the combined sewer is the only
option for stormwater disposal. Where dispensation is given, each unit must have
an independent combined private connection to the sewer. The private
wastewater and stormwater pipes must join together as close as possible to the
connection to the combined public sewer to allow for future separation.
Stormwater Detention tanks are generally required. Refer to Separation of Private
Sewers below and to sub-section 3.17: Separation of Private Drainage.
Separation of Private Sewers
All existing combined private drainage must be separated where development
increases impervious area by more than 20m² or where major re-development of
the site is proposed. Where a site development has options for stormwater
discharge other than to the combined sewer, those options must be fully explored
and used as far as possible. Refer to Section 5: Stormwater, sub-section 5.2:
Approved Discharge Points.
Separation of Public Sewers
All development projects initiated within combined areas are to have separation
considered as part of the proposal. A development proposal within a combined
area where public sewer separation is in progress, must consider the proposed
separation works as part of the proposal. Contact ACE Development Engineering’s
(DE) Duty Engineer for areas where public separation projects are in progress.
Discharge and associated Consents may be required for stormwater disposal and
should be discussed with DE’s Duty Engineer.
Consent Applications
All Building, Subdivision and Resource Consents are to consider the proposed
Metrowater sewer separation programme. Refer to Metrowater for the latest
programme details.
Key
Documents
•
•
•
•
Building Act 2004
Building Regulations 1992 (and Amendments)
Resource Management Act 1991 (and Amendments)
Code of Urban Subdivision and Development 1999 (§ 3.3.1) [Auckland City
Council]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 21
Section 3
Drainage
3.16
Separation of Public Drainage
Policy
Year 2010 Targets
A review of the DSP in the 2008-09 will clarify the future targets.
Key
Documents
•
Focus on the Future 2006: Strategic Plan [Auckland City Council]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 22
Section 3
Drainage
3.17
Separation of Private Drainage
Refer
•
•
•
also to:
Sub-section 3.15: Combined Sewers;
Section 5: Stormwater, sub-section 5.2: Approved Discharge Points;
Section 5: Stormwater, sub-section 5.9: Stormwater Storage Devices.
Each site must have separate private systems for wastewater and stormwater.
Separation of private combined drainage is required when a site is developed
within a combined catchment.
Policy
Private Separation
Private separation of all private drainage on a site is required for:
• All subdivisions;
• Any Development that involves work on the wastewater drainage, or works
that increase the site’s roof or drained impermeable area by20m² or more.
Site and Drainage Plans
A detailed site and drainage plan (including all public and private drainage) must
be supplied with all Consent applications. These plans must include drainage
details of all existing and proposed impermeable areas.
New Private Wastewater and Stormwater Drains
Where separation of existing drainage is required, the preferred option is to use
the existing combined private drain for stormwater, with a new private drain
installed for wastewater. However, if satisfactory testing and rehabilitation of the
combined private drainage is carried out prior to use, a new private stormwater
drain may be installed with the existing combined private drain being used for
wastewater. Detention tanks may be required for both options. Refer to Subsection 5.9: Stormwater Detention and Re-use Tanks.
Extent of Private Separation
All of the site’s private drainage must be separated, with the separate wastewater
and stormwater drains taken to approved outlets (including private soakage where
applicable – refer to Auckland City Council’s Soakage Design Manual). Where the
site must discharge stormwater into a combined drain, the separate private drains
must continue as close as possible to the single connection to the combined public
sewer or boundary of where the existing combined private drain exits the lot.
Refer to diagram On-Site Separation of Private Drainage below.
Costs
Costs of separating private drainage are to be met by the property-owner or
developer.
Key
Documents
•
•
•
•
Building Act 2004
Building Regulations 1992 (and Amendments)
Resource Management Act 1991 (and Amendments)
Code of Urban Subdivision and Development 1999 (§ 3.3.1) [Auckland City
Council]
(Hard Copy only)
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 23
Section 3
Drainage
3.17 (cont)
Separation of Private Drainage
Diagrams
On-Site Separation of Private Drainage
Existing - Downpipes and catchpits
feed directly into private combined
drain.
EXISTING
Separated - Sewage gully traps feed
into new wastewater only line to within
1m of site boundary, then connect into
existing private combined drain. All
site stormwater flows through holding
tank as required.
PROPOSED
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 24
Section 3
Drainage
3.18
Service Connections
Refer
•
•
•
Policy
also to:
Sub-section 3.15: Combined Sewers;
Section 2: Development, sub-section 2.7 Additional Dwellings.
Section 7: Standard Drawings, 12908/245 to 12908/247.
Connections Required and Permitted
Each lot must be provided with independent and separate service connections for
disposal of stormwater and wastewater. Only one service connection per lot (for
each service) is permitted.
Procedure
Connection to the public stormwater and wastewater systems can only be made by
a Registered Drainlayer and only after a Building Consent or Engineering Approval
has been obtained from Auckland City Council. Service connections must be
connected to the public drain as shown in Section 7: Standard Drawings,
12908/245 to 12908/247. Service connections to wastewater systems deeper than
5m must be specifically designed.
Service Connection Sizes
Wastewater and stormwater service connections must be 100mm diameter in
residential areas, and at least 150mm diameter in business, commercial and
industrial areas.
Connection Ownership and Responsibility
Service Connections are considered to be part of private drainage and are
therefore a private responsibility even if located outside the subject property
boundary.
Abandoned Service Connections
Abandoned wastewater service connections must be removed and the connection
replaced with a section of public pipe. These replaced sections of public pipe will
require inspection by Development Engineering (DE) engineers. For each service
connection to be abandoned, the section of pipe affected by the service connection
must be cut out and replaced with a straight length of pipe. The cut at either end
would be within 300mm of an existing joint, that cut must be taken to the far side
of that joint. The joints at each end of the new pipe must use shear ring couplings
meeting Type B, AS/NZS 4327: 1995.
Key
Documents
•
•
•
•
•
•
NZS 4404:2004: Land Development and Subdivision Engineering
Local Government Act 1974 (and Amendments) (§ 459)
Local Government Act 2002 (and Amendments)
Consolidated Bylaw 1991 (and Amendments) (§ 6.4) [Auckland City
Council]
AS/NZS 4327:1995: Metal-Banded Flexible Couplings for Low-Pressure
Applications
Road Opening Notice [Traffic and Roading Services] [Hard copy only]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 25
Section 3
Drainage
3.19
Common Private Drains
In the past, dwellings were constructed that share a ‘common private drain’ – a
shared pipe which carries stormwater and/or wastewater into the public drainage
system. Any of these drains still existing are the private responsibility of the joint
owners.
Policy
New Common Private Drains
In the case of freehold and x-lease subdivision applications, no applications for
common private drains will be approved. Each dwelling/unit must have its own
connection to the public drainage system.
Approved Common Private Drains
Where a common private drain has been approved, a binding memorandum must
be registered on the titles, and the drain must be recorded as common on
Auckland City Council’s public drainage plans. Details of such memorandum are
obtainable at Development Engineering.
Development on Existing Common Private Drains
In older regions (for example, Grey Lynn) 100mm diameter drains may have been
laid to serve a number of units/dwellings (not unit titles). These are generally in
poor condition. Any future development including new dwellings, cross-leases or
subdivisions, where the site is currently served by a common private drain, will
require as a condition of consent, that the existing and new dwelling within the
development site be serviced by a separate connection to the public system. This
may involve construction of a new public wastewater pipe. Refer to diagram New
Public Drain to Replace Common Private Drain below.
In cases where alterations to an existing dwelling are proposed, the applicant must
confirm that the condition of the existing private common drain is adequate and
that the drain has capacity for the existing and proposed flows.
Key
Documents
•
•
•
•
•
Building Act 2004
Building Regulations 1992 (and Amendments)
Local Government Act 1974 (and Amendments) (§ 459)
Local Government Act 2002 (and Amendments)
AMIS/GIS-based Asset Records [Auckland City Council] [Hard copy only]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 26
Section 3
Drainage
3.19 (cont)
Common Private Drains
Diagrams
New Public Drain to Replace Common Private Drain
New public 150 mm dia sewer
extension required to service
existing & proposed dwelling.
Property owner consents required
from 116-118 Bright Street.
Proposed Dwelling
Existing dwelling.
Bright Street
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 27
Section 3
Drainage
3.20
Easements: Private Drainage on Private Land
Refer also to:
• Sub-section 3.14: Acquiring Access to Land.
Where a lot must drain through another lot to connect to an approved discharge
point, permission from the affected landowner must be obtained.
Policy
Local Government Act 1974
Section 461 sets out the landowners’ rights when the drain has been laid through
an adjacent property, with permission from the affected landowner (or under
Section 460), and specifies that these rights may be noted on the relevant titles.
Registration
Formal registration of the easement on adjacent property titles or a Section 461
agreement, are required for private drains traversing other properties. Copies of
the 461 agreement may be obtained from Auckland City Council Environments’
(ACE) Property Information System. A signed 461 agreement from the affected
landowner shall be submitted to ACE prior to approval of the proposal.
Alternatives
Creation of an ‘inappropriate’ (for example, very short) section of public drainage is
not permitted as an alternative to registering an easement or a Section 461
Certificate. Where a proposed private drain will pass through and may be able to
serve more than one other lot, constructing a public line should be considered.
Key
Documents
•
•
•
•
Local Government Act 1974 (and Amendments) (§ 459)
Local Government Act 2002 (and Amendments)
Resource Management Act 1991 (and Amendments) (esp. § 108, 224)
Code of Urban Subdivision and Development 1999 (§ 3.3.1) [Auckland City
Council]
( Hard Copy Only)
•
Section 461 Certificate [Auckland City Environments] [Hard copy only]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 28
Section 3
Drainage
3.21
Easements: Private Drainage on Public Land
Policy
Roads
Private drainage within the road reserve is not covered by easements. A Road
Opening Notice must be obtained from Auckland City Council Transport for any
works in the road reserve prior to commencement of works. A record of these
works, if drainage related, are kept by Auckland City Environments’ (ACE) Property
Information System, in the form of private drainage As-Built plans.
Parks and Reserves
Formal easements for private drainage through an Auckland City Council Reserve
are generally not granted, public drainage is preferred. For all work within parks
and reserves, specific approval must be obtained from Arts, Community and
Recreation Policy (ACR). When consulting with ACR regarding an application for a
private drain on public land, documentation must be provided which clearly
demonstrates why it is not feasible to install public drainage works in this instance.
ACR Policy may consult with ACR Services who maintain the reserves.
Other Land Owned by Auckland City Council
Where Auckland City Council is recorded as the owner of the land in question,
queries related to easements should be directed to the Property Department
Manager who acts as the land owner for this purpose.
Regional Land and Esplanade Reserves
Any work on land outside of Auckland City Council’s control, requires specific
approval from the appropriate authority.
Alternatives
Where a proposed private drain passes through and may be able to serve more
than one other lot, constructing a public line should be considered.
Key
Documents
•
•
•
Local Government Act 1974 (and Amendments) (§ 460, 461)
Local Government Act 2002 (and Amendments) (§ 181)
Road Opening Notice [Traffic and Roading Services] [Hard copy only]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 29
Section 3
Drainage
3.22
Easements: Public Drainage on Private and Public Land
Refer also to:
• Sub-section 3.14: Acquiring Access to Land.
The Local Government Act 2002 grants comprehensive powers to Auckland City
Council to enable it to locate, access and work on its drainage on private land.
Policy
Public Drainage
Easements over private or public land for public drainage systems are not required.
Detention Dams
Detention dams must be registered on titles of the affected land.
Drainage Easements
Queries on drainage easements in favour of Auckland City Council should be
directed to the applicant’s solicitor in the first instance. Requests to remove
stormwater and combined easements should be directed to ACC Environmental
and Utility Management (EUM) Manager. Requests to remove wastewater
easements should be directed in the first instance to the Metrowater’s
Development Team. All related costs will be borne by the applicant.
Drainage On Crown Land
All negotiations regarding proposed works within or discharges to crown land
owned by New Zealand Railways Corporation (ONTRACK) or Transit NZ are to be
between the developer and ONTRACK / Transit NZ representatives. Refer to Subsection 3.14: Acquiring Access to Land.
Key
Documents
•
•
Local Government Act 1974 (and Amendments)
Local Government Act 2002 (and Amendments) (§ 181)
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 30
Section 3
Drainage
3.23
Private Pump Stations
Refer
•
•
•
•
•
Policy
also to:
Sub-section 3.14: Acquiring Access to Land;
Sub-section 3.20: Easements: Private Drainage on Private and Public Land;
Sub-section 3.20: Easements: Public Drainage on Private and Public Land;
Section 6: Water Supply, sub-section 6.25 Backflow Prevention;
Section 7: Standard Drawings, 12908/250.
Wastewater Private Pump Stations
Specific approval is required for private wastewater pump stations for new
development or major re-development. Applications will not be considered unless
the development is topographically unable to be drained by gravity means, i.e. the
property lies in a local depression or basin. The objective is to achieve a gravity
connection to a public system wherever possible. Auckland City Environments
(ACE) and Metrowater’s Development Team Leader will consider applications on a
case-by-case basis.
Stormwater Private Pump Stations
New private stormwater pump stations will not be approved for any new
development and alternative methods of stormwater disposal must be found.
Where such options are unavailable, development may be declined.
Secondary Pumps for Stormwater and Wastewater
Secondary stormwater and wastewater pumps may be considered for
developments of minor dwellings (for example, basement bathrooms, low area
paving (not greater than 20m²) or retaining wall drainage), provided the primary
dwelling can be serviced by a gravity connection.
Maintenance
At the subdivision stage, a Consent Notice must be applied to the title of the new
lot to ensure any subsequent owner is aware of the proposed method of
wastewater and stormwater disposal and the associated pump maintenance
requirements. Operation and maintenance of the pump must include provision for
preventing backflow into the drainage (both of wastewater and of stormwater). A
Backflow Device Consent must be obtained from Metrowater.
Pumping to a Public Wastewater System
A private rising main must connect to a private manhole or mini chamber, prior to
discharge into the public system. The portion of pipe from the private chamber to
the public system must be a public pipe and will need Engineering Approval from
Auckland City Environments (ACE). Refer to Section 7 Standard Drawings,
12908/250. Directly pumping to public rising mains is not permitted.
Key
Documents
•
•
•
Building Act 2004
Building Regulations 1992 (and Amendments) (esp. § E1.3.3 (a))
Code of Urban Subdivision and Development 1999 (§ 5.2.2) [Auckland City
Council]
•
Draft Wastewater Pump Station Design Manual 1999 [Metrowater] [Hard
•
Foulwater Pump Station Design Manual 1989 [Auckland City Council] [Hard
( Hard Copy Only)
copy only] Until this Manual is operative, it must be consulted in conjunction with:
copy only]
Development and Connection Standards – Water, Wastewater and Stormwater Design and Policy Manual for Auckland City Isthmus, 4th Edition Mar 2009
Copyright © Mar 2009
Page 3 - 31