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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-6.9 Wastewater Pump Stations

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Drawing Ref: T660, T661, T662, T663, T664, T665, T666, T667, T668, T669, T670, T671, T672, T673, T674, T675, T676, T677, T678, T679, T680, T681, T682, T683

City Plan Performance Standard: Appendix 12C
  1. Each wastewater management system shall be designed and constructed to ensure:
    1. Pump stations or network structures (e.g. manholes) located within the stormwater management system’s secondary flowpath (excluding Road Zone and vehicle and pedestrian accessways) shall have a finished lid level of 500mm above the design flow of the flowpath or the level of ponding. 
  2. Wastewater pump stations shall be used only where gravity reticulation cannot optimally serve the entire catchment.
    1. Pump stations shall be located on a separate lot specific for that purpose. That lot shall:
    2. Be vested in Council; 
    3. Be provided with all weather access of not less than 3 metres wide;
    4. Include a clear area of 5 metres x 5 metres to enable installation of a biofilter.
  3. Safe, reasonable and practical access shall be provided to the wastewater management system for its maintenance.

Wastewater pump stations convey wastewater from developed areas where natural landform and gradients do not allow for a gravity system to be used. It is important that’s factors affecting a pump station’s operation are understood as the effect of an overflow on the surrounding area and/or watercourses is unacceptable due to important cultural, ecological and environmental implications as well as public health and pollution issues.

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

DS-6.9.1   Calculation of Flows

The following shall apply:

  1. The pump station shall be sized to accommodate pumped flows from the total foreseeable contributing catchment.
  2. Each pump shall be sized such that the duty pump is capable of pumping the maximum design peak flow, calculated in accordance with DS-6.4.1 Calculation of Flows.

DS-6.9.2   Freeboard

The pump station finished lid levels shall be located no less than 300mm above the 100 year return period storm event (1%AEP) flood level.

DS-6.9.3   Wet Well and Storage Chamber

Drawing Ref: T660, T661, T662, T663, T664, T665, T666, T667, T668, T669

The following shall apply:

  1. These shall be as specified in the Standard Drawings.
  2. Pump stations and vents shall be located to avoid being a noise or odour nuisance to occupants of buildings or likely building sites.
  3. Wet wells and storage chambers shall be designed to accommodate all anticipated loadings and safely accommodate all maintenance and operations vehicles and personnel. 
  4. The wet well operational volume (volume between duty pump start and stop level) shall be designed at full catchment average dry weather inflow to limit pump starts to a maximum of 15 an hour based on the following formula:

Operational Volume (litres) =    900 x Q
                                                     
Q = Pumping Rate (l/s)
N = Number of starts per hour
Operational depth shall be a minimum of 1.5m measured from the invert of the inlet pipe.    

  1. The design and construction of the wet and storage well foundations shall ensure that no more than 10mm effective long term total or differential settlement of the completed structure occurs and a factor of safety of 1.25 against flotation is obtained. Effects on adjoining infrastructure must be considered.
  2. A geotechnical investigation report may be required by Council at the time of the application for Resource Consent or the development plan approval.
  3. In determining the appropriate wet well diameter the minimum clearance between individual pumps and side clearances shall comply with the manufacturer’s recommendations.
  4. A minimum clearance of 100mm all round the well shall be provided at the lid entrance.
  5. Where a separate well is considered necessary to accommodate emergency storage volume it shall be designed to direct all flow to the outlet point and be self cleansing.
  6. A hinged entry safety grill shall be fitted immediately under the wet well chamber lids.

DS-6.9.4   Pump Station Inlet Pipe

The following shall apply:

  1. The invert level of the gravity inlet pipe and emergency storage well shall be a minimum of 100mm above the standby pump start level to prevent surcharge of the system during normal operation.
  2. Only one gravity pipe may discharge into the wet well and must include an isolation valve. Where multiple inflows occur they must discharge to a receiving manhole, then into the wet well.

DS-6.9.5   Pump Selection

  1. In calculating the system head losses the effects of all bends and fittings beyond the pump discharge bend shall be allowed for, together with rising main friction losses. Calculations of friction loss shall be carried out based on roughness ‘Ks’ values of 1.5mm and 0.5mm to ensure that the selected pump is capable of operating over this range of duty points. (Colebrook White formula).  Where the discharge is to an existing rising main, the head shall be calculated to include the operating head in the existing rising main. Council approval is required for any discharge into an existing rising main. 
  2. The system static head shall be based on the difference in level between the flange of the pump discharge bend and the highest point on the rising main system.
  3. The pump and rising main selection shall ensure the minimum velocity in the rising main is 1.0m/sec and the maximum 2.0m/sec (at peak design discharge rate).
  4. In selecting pumps the operating conditions shall correspond as closely as possible with the point of maximum pump efficiency. However final pump selection must be approved by the Council to facilitate some standardisation of pump model and impellor type and sizes.
  5. Standard pump stations shall include 2 identical submersible Wastewater pumps, one as a duty pump and the other as a standby. Larger pump stations may require additional pumps.
  6. The pump type shall be as specified in AM-6 Wastewater.

DS-6.9.6   Impellers

To prevent unnecessary blockage all pumps shall be fitted with an ‘N" impeller approved by the Council. Where a mini pump station is constructed to service 5 lots or less, some departure from the IDC may be acceptable. However, approval is required from Council.

DS-6.9.7   Power Supply

Drawing Ref: T672, T673, T674, T675, T676, T677, T678, T679, T680, T681, T682, T683

All pumps shall be operated from a three-phase electrical power supply system.

DS-6.9.8   Control and Alarm Levels

Control and alarms levels shall be as outlined in Table 6.6: Control and Alarm Levels.

Table 6.6: Control and Alarm Levels

Control Type Level
Low level alarm Set to activate if the water level drops below cut out level for more than 1 minute
Pump stop level Minimum submergence level of pumps
Duty pump start level 150mm below incoming wastewater invert level
Standby pump start level 100mm above duty cut-in level
High level alarm 100mm above stand-by cut-in level
Critical alarm 100mm below spill level

DS-6.9.9   Emergency Storage

The following shall apply:

  1. A total of 9 hours emergency storage must be provided upstream of the pumping station. This volume may include the upstream pipelines and manholes in calculating storage design but only after approval has been received from Council.
  2. Specifically designed emergency storage chambers may be required to supplement the volume provided by the collection system.

Definitions in this section

AEP

Council

Design

Development works approval

IDC

Infrastructure

Lot

Resource consent

Wastewater

Tauranga City Council, Private Bag 12022, Tauranga, 3143, New Zealand  |  Terms of use

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