Hydraulic Design Assessment for Services Connection

Assessment of hydraulic designs is undertaken to ensure the proposed works does not detrimentally impact on the integrity of Hunter Water’s water and sewer systems.

The assessment is also undertaken to ensure the development complies with the design principles and requirements of our Operating Licence, Customer Contract and the Services Connection Policy.

We require you to prepare and submit hydraulic designs if your proposed development falls into any of the following categories:

  • water services of 32mm diameter or greater
  • more than 2 residential units on the lot
  • when a commercial development requires a meter greater than 25mm
  • the development requires an internal fire service or alterations to existing services
  • there is potential for trade waste to be discharged to Hunter Water sewer or there are alterations proposed to an existing installation
  • where water supplied is to be used in manufacturing processes
  • if there is a request to either upsize or downsize an existing meter
  • any development which is considered to be outside normal connection criteria
  • if the development requires an internally boosted water system
  • private pressure sewer pump systems (other than common pump effluent systems)
  • multiple water metering systems
  • multiple underground rain water tanks installed when a Hunter Water drinking water supply could be connected indirectly or directly
  • any alternative water supply systems other than rain water

Hydraulic Plans shall be  prepared and submitted in accordance with the NSW Code of Practice: Plumbing and Drainage and Australian Standards AS/NZ 3500 and Hunter Water services connection policy.

 The submitted design shall clearly identify design standards and referenced as AS/NZS3500 or a Deems to Satisfy System. Deems to satisfy systems would require the accompanying independent certification documents. The design shall fully encompass  the scope of works detailed in the Hunter Water services connection policy.

We also require the following information to be included on plans submitted for review:

  • any Hunter Water water and sewer mains 
  • location of existing water meters and sewer connections
  • type of connection to Hunter Water sewer system i.e. inspection shaft or boundary trap
  • the reduced level (RL) of overflow gullies, ground  floor level basement also 1-in-100-year flood level. Location of shafts for individual strata units. Indicate where and how water is to be used in processing
  • cross connections between Hunter Water water system and other water systems
  • trade waste facilities (size, type and description)
  • air conditioning cooling towers
  • the total simultaneous water supply demand per litre per second
  • the total daily sewerage discharge to Hunter Water sewerage system
  • information and design drawings if the scope of works extends outside the confines of the property boundary
  • management/ownership plan
  • registered Strata Plans

Application Forms

  • Frequently Asked Questions

    • How do I submit hydraulic designs?

      Answer

      Complete an application form to be completed and submit to us. Attach a covering letter should include the following details:

      • A description of plumbing and drainage works required to service the proposed development.
      • Meter and service sizes and flow rates, including information on how sizes and rates were determined. The ultimate fixture loading on the house drainage system.
      • The submitted design complies with Hunter Water requirements as  referenced in the Customer Contract and Operating Licence.
      • Identify relevant hazards or internal operational systems that may detrimentally effect the operation of Hunter Water assets or the environment.

      The Hydraulic Plan Checklist should also be submitted with the designs.

    • How does Hunter Water assess hydraulic designs?

      Answer

      The plan is then assessed by our technical staff to determine the suitability of the design with regard to meeting Hunter Water’s requirements.

      Assessment of the plan is focussed mainly on the points outlined below:

      • the size of services and meters
      • location of meters
      • installation of appropriate backflow prevention devices and identified hazards
      • connection to the sewer system
      • the potential for discharge of trade-waste to the sewer system
      • configuration of water storage tanks (including backflow prevention details)
      • pump to sewer arrangements (where applicable)

    • What details does Hunter Water not assess?

      Answer

      Details not assessed by us on hydraulic designs:

      • internal hot water, gas and stormwater systems.
      • location of plumbing fixtures, floor wastes etc, covered by the Building Code of Australia.
      • fire services, location of booster and suction points, size of internal pipework, location of hydrants, fire hose reels, wall drenchers and sprinkler heads and fire storage tanks within the lot/development that are covered by the Building Code of Australia.
      • the performance of water and sanitary drainage fittings and fixtures.
      • the design and performance of sanitary plumbing and house drainage.
      • approve the use of any water supply fixture, fitting, sanitary or house drainage fixtures, fittings that do not have approval (Water Mark or Australian Standards marking).
      • the use, location, size and type of rainwater tanks, not connected to Hunter Water potable water supply.
Quarterly Solutions
Basix
Basix

News

View All