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  2. General
  3. Infrastructure Development Processes
  4. Quality Assurance Information Requirements
    1. QA-1 Resource Consent Application Requirements
    2. QA-2 Works Undertaken By or For a Council
    3. QA-3 Development Works Approval
    4. QA-4 Survey Plan (s223) Approval
    5. QA-5 Final Sign Off (s224c) Application Requirements
    6. QA-6 As-Built Information
    7. QA-7 Bonds and Maintenance Fee
    8. QA-8 Building Consent Considerations
  5. Design Standards
    1. DS-1 General Provisions
    2. DS-2 Streetscape
    3. DS-3 Reserves
    4. DS-4 Transportation Network
    5. DS-5 Stormwater
    6. DS-6 Wastewater
    7. DS-7 Water Supply
    8. DS-8 Public Lighting
    9. DS-9 Network Utilities
    10. DS-10 Natural Hazards & Earthworks
    11. DS-11 Road Zone/Road Reserve Occupancy
    12. DS-12 Building Consent Considerations
  6. Standard Drawings
    1. SD-1 General Provisions
    2. Street design diagrams
    3. T100 Perspective Drawings
    4. T200 Streetscape
    5. T300 Reserves
    6. T400 Transport Network
    7. T500 Stormwater
    8. T600 Wastewater
      1. T601-Manhole - Standard
      2. T602-Manhole - Shallow
      3. T603-Manhole - Ladder and Steps
      4. T604-Manhole - Precast 1050mmØ Lid
      5. T605-Manhole - Entry Fixing
      6. T606-Manhole - Standard and Raised Access Detail
      7. T607-Manhole - Inclined Access Detail
      8. T608-Manhole - Internal Drop
      9. T609-Manhole - External Drop
      10. TT610-Manhole - PE Pipe Connections - Wall Adapter and Pre-Cast Manhole
      11. T611-Manhole - PE Pipe Connections - Stub Flange and In-Situ Base
      12. T612-Manhole - PE Pipe Connections - Electrofusion Coupler and In-Situ Base
      13. T613 Manhole - PE Pipe Connections - Puddle Flange and Pre-Cast Manhole
      14. T614-Manhole - Access Detail in Carriageway
      15. T620-Rodding Eye - Shallow < 2.5m
      16. T621-Rodding Eye - Deep > 2.5m
      17. T630-Property Connection - Standard
      18. T631-Property Connection - Depth > 2.5m
      19. T632-Property Connection - Within Property
      20. T633-Property Connection - Outside Property
      21. T634-Property Connection - Entry to Wastewater Main/Manhole
      22. T637-Lateral Connection - Single Connection to Manhole
      23. T638-Lateral Connection - Two or More Connections to Manhole
      24. T639-Lateral Connection - Single Connection to Main
      25. T640-Lateral Connection - Two Connections to Main
      26. T641-Lateral Connection - Two Adjacent Connections to Main
      27. T642-Lateral Connection - Rear Lot Connection
      28. T643-Mains Connection - Saddle Connection
      29. T651-Bedding and Backfill Details
      30. T652-Anti-Scour Block and Trenchstop
      31. T653-Buildings Near Public Mains
      32. T654-Close Proximity - Retaining Wall Restrictions
      33. T660-Pump Station - Typical Site Layout
      34. T661-Pump Station - Elevation Section
      35. T662-Pump Station - Plan Section
      36. T663-Pump Station - Pedestal Base Plate, Pedestal Mounting, Valve Chamber and Riser Connection
      37. T664-Pump Station - Deflector Plate, Ladder and Plinth
      38. T665-Pump Station - Valve Extension Spindle, Spindle Guide and Handwheel
      39. T666-Pump Station - Cover Slab
      40. T667-Pump Station - Frame
      41. T668-Pump Station - Chamber Lid
      42. T669-Pump Station - Chamber Lid Padlock and Handle
      43. T670-Pump Station - Rising Main Entry to Receiving Manhole
      44. T671-Pump Station - 25mm Water Service Connection
      45. T672-Pump Station - Electrical - Standard 2 Pump Stn Without Soft Starters (1 of 2)
      46. T673-Pump Station - Electrical - Standard 2 Pump Stn Without Soft Starters (2 of 2)
      47. T674-Pump Station - Electrical - Standard 2 Pump Stn SMC - 3 Soft Starters (1 of 2)
      48. T675-Pump Station - Electrical - Standard 2 Pump Stn SMC - 3 Soft Starters (2 of 2)
      49. T676-Pump Station - Electrical - Standard 2 Pump Stn IMS2 Soft Starters (1 of 2)
      50. T677-Pump Station - Electrical - Standard 2 Pump Stn IMS2 Soft Starters (2 of 2)
      51. T678-Pump Station - Electrical - Standard 2 Pump Stn ISMC - 3 Soft Starters (1 of 3)
      52. T679 Pump Station - Electrical - Standard 2 Pump Stn ISMC - 3 Soft Starters (2 of 3)
      53. T680-Pump Station - Electrical - Standard 2 Pump Stn ISMC - 3 Soft Starters (3 of 3)
      54. T681-Electrical - 2 Pump Stn Mincas SMC-3 Soft Starters (1 of 2)
      55. T682-Electrical - 2 Pump Stn Mincas SMC-3 Soft Starters (2 of 2)
      56. T683-Pump Station - Electrical Cabinet
    9. T700 Water Supply
      1. T700-Water Supply Pipe Hierarchy
      2. T701-Water Supply - Looped and Linked Principal Mains
      3. T705-Water Main - Location at Intersections
      4. T706-Watermain - Location at Cul de Sac
      5. T707-Water Main - Rider Main to Main Connection
      6. T708-Water Main - Flushing Point
      7. T709-Water Main - Branch Valves and Hydrant Combinations
      8. T710-Water Main - Support for Asbestos Cement Main
      9. T713-Hydrant Surround
      10. T714-Hydrant Box
      11. T715-Hydrant Surround Blocks
      12. T716-Valve Surround
      13. T717-Valve Box
      14. T718-Valve Surround 75mm Concrete
      15. T719-Valve Surround 100mm Concrete
      16. T720 Valve Surround Heavy Duty Concrete
      17. T721-Anchor block for Sluice Valves on Mains
      18. T722-Anchor Block for Flanged Fittings on Mains
      19. T723-Thrust Blocks
      20. T724-Hydrant and Valve Marker Post
      21. T727-Water Meter - Type 1 and 2 Point of Supply Location Installation
      22. T728-Water Meter - Type 3 and 4 Point of Supply Location Installation
      23. T729-Water Meter - Fire System Connection With Potable Supply Installation
      24. T730-Standard 20mm Manifold Connection
      25. T731-Standard 20mm Manifold Connections - Plan View
      26. T732-Multiple 20mm Installations
      27. T733-20mm Connection Requiring Double Check Valve
      28. T734-20mm Connection Requiring RPZ Installation
      29. T735-25mm, 40mm or 50mm Meter Installation With Double Check Valve
      30. T736-<50mm Meter Installation with RPZ
      31. T737-Property Connection - 50mm Combination Meter Installation with Double Check Valve
      32. T738-Combination Meter Installation with RPZ
      33. T739 >50mm Combination Meter Installation with RPZ & Bypass Option
      34. T740-Property Connection - Secure Connection
      35. T741-Manhole - Class A Loading
      36. T742-Chamber - Class A Loading
      37. T743-Manhole - Class B Loading
      38. T744-Chamber - Class B Loading
      39. T751-Bedding and Backfill Details
      40. T753-Buildings Near Public Mains
    10. T800 Public Lighting
    11. AB As-Built Drawings
  7. Approved Materials
  8. Construction Standards
    1. CS-1 General
    2. CS-2 Site Clearance
    3. CS-3 Earthworks
    4. CS-4 Excavation
    5. CS-5 Excavation in Trench
    6. CS-6 Fill
    7. CS-7 Bedding & Backfill
    8. CS-8 Subsoil Drainage for Earthworks & Roads
    9. CS-9 Pipework
    10. CS-10 Pipe Fittings
    11. CS-11 Manholes & Rodding Eyes
    12. CS-12 Sumps
    13. CS-13 Trenchless Technology
    14. CS-14 Road Ripping
    15. CS-15 Road Pavement Layers
    16. CS-16 Kerb & Channel
    17. CS-17 Concrete Work
    18. CS-18 Carriageway Surfacing
    19. CS-19 Roadmarking
    20. CS-20 Berm Features
    21. CS-21 Street Structures
    22. CS-22 Road Maintenance
    23. CS-23 Grassing & Turfing
    24. CS-24 Vegetation Planting & Gardens
    25. CS-25 Reinstatement
  9. Inspection & Testing Requirements
    1. IT-1 General Provision
    2. IT-2 Streetscape
    3. IT-3 Reserves
    4. IT-4 Transportation Network
    5. IT-5 Stormwater
    6. IT-6 Wastewater
    7. IT-7 Water Supply
    8. IT-8 Public Lighting
    9. IT-9 Network Utilities
Infrastructure Development Code

DS-5.6 Stormwater Treatment / Detention

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City Plan Performance Standard: Appendix 12B 
  1.  Any proposed stormwater treatment and detention system shall be located on land owned by, or to be vested in the Council.

(Where this is not possible or practical in the opinion of the Council, the stormwater treatment and detention system may be provided on-site, subject to appropriate conditions of consent being provided with respect to the construction, operation and maintenance of the approved system together with the provision of easements and/or covenants on the land title(s) protecting Council’s interests as far as the operation and maintenance of (including access to) the on-site stormwater system is concerned).

  1. Safe, reasonable and practical access shall be provided to the stormwater management system for its maintenance.

Stormwater ponds are an accepted method of improving stormwater quality, reducing downstream flood potential and peak downstream flow rates. Council is not in favour of encouraging a proliferation of small stormwater ponds but prefers a total catchment/treatment train approach.

DS-5.6.1   Permanent Pond Type

Council accepts the use of dry and wet ponds as a part of an engineered solution and/or treatment train. However, the selection and design criteria (short term as well as long term functionality, maintenance, ownership) must be approved by Council before construction. Access from public carriageways shall be provided for maintenance.

DS-5.6.1.1   Regional Council Resource Consent

The following shall apply:

  1. Permanent ponds may require Resource Consent from Bay of Plenty Regional Council as part of an earthworks and/or stormwater discharge Resource Consent. Refer to DS-5.3 Regional Council Requirements and contact Bay of Plenty Regional Council for more information.
  2. Temporary ponds may require Resource Consent from Bay of Plenty Regional Council as part of the earthworks Consent and/or discharge Resource Consent. Refer to DS-5.3 Regional Council Requirements and contact Bay of Plenty Regional Council for more information.
  3. Pollutants and contamination issues shall be identified and managed to the satisfaction of Council and any Resource Consent conditions related to the pond.

DS-5.6.1.2   Permanent Pond Ownership and Location

The following shall apply:

  1. If acceptance of ownership of a pond is agreed by Council all stormwater ponds and the access to them shall be located on land either:
    1. Owned by Council.
    2. Proposed to be vested in Council at completion of the development. 
  2. Ponds that are not proposed to be vested in Council shall be discussed with Council prior to application for Resource Consent or, if no Resource Consent is required, prior to construction of the pond to ensure the pond construction has minimal or no impact on Council’s existing stormwater system.

DS-5.6.1.3   Detention Pond Design

The following shall apply:

  1. Detention Ponds shall be designed to the following minimum requirements:
    1. Compliance with DS-1 - Apx A.1 General.
    2. Stormwater ponds shall be designed to ensure that retention and treatment to achieves removal of 75% of total suspended sediment smaller than 120µm diameter on a long term average basis. 
    3. Any pond shall be designed to ensure any discharge has a suspended solids concentration no higher than 150 g/m³. 
  2. Specific matters to consider in pond design:
    1. Side slopes with safety considerations - maximum 1:5 slope above and below water level.
    2. Ease of access for and of maintenance including mowing and silt removal and disposal and access to public roads.
    3. Shape and contour for amenity value.
    4. Effectiveness of inlet and outlet structure/s. 
    5. Overflow design and scour protection.
    6. Pest control (rats, mosquitoes etc.) and wind blown debris.
    7. Sustainability of aquatic life.
    8. Depth of water.
    9. Use in treatment of stormwater.
    10. Minimise dead zones and short-circuiting to improve the treatment performance of the pond.

Dependent on catchment water quality, local ground conditions and soil properties, Council may require, (in exceptional cases), that ponds shall be lined. 

The designer shall refer to Councils Stormwater Management Guidelines for more information regarding designs of this type. 

DS-5.6.2  Constructed Wetlands

Constructed wetlands are large shallow planted ponds which are designed to provide stormwater quality improvement, reduce downstream flood potential and peak downstream flow.  
They differ from Detention Ponds in that they can be shallower, provide greater contaminant removal (including nutrients) and support a wider variety of aquatic plants and wildlife. They can also be more attractive and designed to provide greater amenity, ecological and safety benefits.  

It shall be demonstrated that a constructed wetland complies with the following:

  1. A catchment area greater than 1 hectare.
  2. Size is calculated to achieve water quality volume.
  3. Includes a littoral and main wetland area at a depth not exceeding 1.0m.
  4. Shall be appropriately planted.
  5. Includes inlet pipework with appropriate erosion control.
  6. Includes an emergency overflow.
  7. Designed for a controlled discharge rate that allows for continuous flow through a wetland to prevent stagnation. 
  8. Provides access for maintenance.

Council approval shall be obtained prior to design and construction of any wetland. All Resource Consent, location, functionality, maintenance and ownership issues shall be confirmed prior to any detailed design commencing.

The designer shall refer to Councils Stormwater Management Guidelines for more information regarding designs of this type. 

DS-5.6.3  Permeable Pavements

Permeable Pavements are hard surface paving systems that reduce stormwater runoff flows and improve runoff water quality. Their porous surface allows stormwater to soak through them before slowly draining away. 

The 3 main types that exist are:

  1. Open cell grid of concrete or plastic with sand/gravel or grass cover.
  2. Solid interlocking blocks with drainage gaps. 
  3. Porous interlocking blocks.

Permeable Pavements shall only be used in low traffic areas such as carparks, driveways and footpaths.
Council approval shall be obtained prior to design and construction of Permeable Pavement.

The designer shall refer to Council's Stormwater Management Guidelines for more information regarding designs of this type. 

DS-5.6.4  Bio-Retention Tree Pits

Bio-Retention Tree Pits collect stormwater from small car park areas or roads. They can reduce stormwater runoff flow velocity, improve runoff water quality and contribute to the overall urban design and aesthetics of an area. 

It must be demonstrated that a Tree Pit complies with the following:

  1. Appropriate functionality and adequate capacity.
  2. Has a ponding area at a level which sits below surrounding land and a maximum ponded water depth of 300mm deep.
  3. Filtration layers shall comprise of the following:
    1. Filtration soil media layer: 400-600mm deep.
    2. Final drainage layer of 2-5mm washed gravel: 300mm deep.
  4. Filtration soil media shall be sandy loam or loamy sand, free of rubbish, plants and weeds with a minimum permeability of 0.3m/day.
  5. Ponding area should drain completely within 24 hours.
  6. An underdrain shall be provided in the final drainage layer with a minimum cover of 50mm. 
  7. An overflow bypass system shall be provided which sits below the surrounding ground surface. 
  8. Achieves all other relevant performance standards for the primary system. 
  9.  Provides access for maintenance.

Council approval shall be obtained prior to construction of Bio-Retention Tree Pits.

The designer shall refer to Councils Stormwater Management Guidelines for more information regarding designs of this type. 


Definitions in this section

Council

Resource consent

 

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