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  1. Home
  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-6.4 Design


City Plan Performance Standard: Appendix 12C
  1. Each wastewater management system shall be designed and constructed to ensure:

    1. Consistency with any relevant structure or urban growth plan; and

    2. It is compatible with the design and construction of the existing wastewater network;

  2. Each wastewater management system shall be designed and constructed to ensure:

    1. All components of the wastewater management system shall be pre-approved by the Council and provide for an asset life that is suitable for its intended purpose;

    2. Gravity is used as the method of reticulation unless pump stations have been pre-approved by the Council;

    3. The upstream catchment is provided for and the downstream receiving network has the capacity and capability to cater for the design scenario; 

(Note: For the purpose of assessing this provision the downstream connection point shall be the nearest trunk sewer pipeline or receiving manhole of a pump station);

  1. The wastewater management system shall utilise a network of underground pipes and pump stations as its primary method of conveyance;

The following shall apply:

  1. Unless otherwise approved by Council, the design of the wastewater system shall be in accordance with the IDC but may be supplemented by the documents noted in DS-6 Apx A.1 General.
  2. A computer modelling system approved by Council may also be utilised.

Detailed design shall be required at the time of Development Works Approval. Where no Development Works Approval is required, Council approval shall be obtained at a time required by Council and before the construction of the system.

DS-6.4.1   Calculation of Flows

City Plan Performance Standard: Appendix 12C
  1. Each wastewater management system shall be designed and constructed to ensure:

  2. The following minimum peak hourly flow rates are achieved:

    1. 0.61 litres / second / hectare for Residential Zones;

    2. 0.7 litres / second / hectare for Commercial and Industrial zones.

The following shall apply:

  1. Wastewater flows are a function of water consumption, infiltration and direct entry of stormwater, which in turn are a function of the age of the system and the quality of maintenance. The wastewater system shall be designed to eliminate intrusion of stormwater & groundwater.
  2. Where part or all of the catchment is serviced or will be serviced by a trunk main to be constructed at a later date, Council may agree to this area being excluded from the calculation. The flow from all portions of the upper catchment within the Tauranga City boundary shall be calculated assuming full development to the zones potential.
  3. In residential areas, the wastewater system shall be designed and constructed using the following parameters:
    1. Population density of 50 people/ha.
    2. Average dry weather flow of 210L/person/day and a dry weather diurnal peak factor of 2.5.
    3. Dilution/infiltration factor of 2 for wet weather.
    4. Peak hourly flow 0.61 L/sec/ha.
  4. For design populations of 1000 people or more, a reduced peaking factor may be discussed and agreed with Council.
  5. In industrial or commercial areas, the wastewater system shall be designed using a discharge rate of 0.7 L/sec/hectare.
Explanatory Note:
These figures include both normal wastewater and trade wastes and include a peaking factor of 5 times average daily water flow (ADWF).
  1. Notwithstanding the above, provision for trade waste shall be made by arrangement with the Council and shall be subject to the provisions of the appropriate Trade Waste Bylaw. The industry type will not necessarily coincide with the zoning classification shown in the City Plan, but the zoning, particularly where effluent discharge is a performance standard, may be used to indicate the minimum design flow where more detailed information is not available.
  2. It may be desirable to provide additional capacity if the developer wishes to widen the range of industries to be located in a development area. However the capacity of the existing receiving facility may be a controlling factor and the final decision will rest with Council.
  3. The design of wastewater disposal systems for "wet" industries (very heavy water users) shall be based on the specific requirements for that industry.
  4. For commercial flows refer to DS-1 - Apx A.1 General.

DS-6.4.2   Hydraulic Design

The following shall apply:

  1. The hydraulic design of the system shall be designed such that maximum design flows can be accommodated without surcharging the pipe network.
  2. The hydraulic design of wastewater pipelines shall be based on tables for the hydraulic design of sewers and pipelines or on graphs or other representation of the same methods based on the Colebrook White or Manning's Formulae.
  3. The pipe roughness coefficient Ks used in the design shall be as shown in Table 6.1 Wastewater Pipe Roughness Coefficients

Table 6.1: Wastewater Pipe Roughness Coefficients

Material Colebrook White co-efficent Mannings roughness co-efficent
PVC-U 0.6 0.011
PE 0.6 0.011
GRP 0.6 0.011
Cement Lining 1.5 0.012
PE or Epoxy Lining 0.6 0.011

DS-6.4.3   Pipe Flow Velocity

City Plan Performance Standard: Appendix 12C
  1. Each wastewater management system shall be designed and constructed to ensure:

  2. The following pipe flow velocities are met:

    1. Maximum velocity: 3.0 metres / second for peak wet weather flow;

    2. Minimum velocity: 0.75 metres / second.

Where a steep grade that will cause a velocity greater than that specified is unavoidable, refer to the Water Services Association of Australia : Sewerage Code of Australia : WSA 02 – 2002 for precautions and design procedures.

Definitions in this section

City plan




Development works approval






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