NCC 2016 Volume Two
Classification
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Classification
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SA 2 Water Efficiency

SA 2 Water Efficiency

HEALTH AND AMENITY

Limitation

Limitation

SA 2 applies to new Class 1 buildings and, extensions to existing Class 1 buildings where the roof catchment area is not less than 50 m2 —

  1. located in Council areas, excluding the Municipal Council of Roxby Downs and the District Council of Coober Pedy and;
  2. where an extension incorporates a water closet or a water heater or laundry cold water outlet.

For the purposes of this part, Council means: A municipal or district Council as constituted under the Local Government Act 1999.

SA 2.1 Performance Provisions

Objective

The Objective is to efficiently use all available water supplies.

Functional Statements

A building is to be constructed in a way that efficiently uses all available water supplies to reduce the amount required from the mains reticulated water supply.

Performance Requirements

A building must provide an additional water supply (other than the mains reticulated potable water supply) which must be plumbed to at least a water closet or a water heater or all the cold water laundry outlets.

SA 2.2 Acceptable Construction Practice

SA 2.2.0 Definitions

The following definitions are used in this part:

Rainwater tank means a vessel for the storage of surface water collected from the roof catchment area of the building.
Roof catchment area means the area of the roof (expressed in square metres), measured on the horizontal (no allowance for slope or vertical surfaces) and includes the plan area of the gutters.
SA 2.2.1 Application

Compliance with the acceptable construction practice provisions of SA 2.2 for water efficiency satisfies Performance Requirement SA 2.1.

SA 2.2.2 Rainwater tank capacity
(a)

Where the roof catchment area of the building is not less than 50 m2, the building must be designed to ensure that surface water run-off from not less than 50 m2 of the roof catchment area is:

(i)

collected by a drainage system complying with Clauses 3.5.1 and 3.5.2 of the Building Code of Australia; and

(ii)

stored in a rainwater tank, the storage capacity of which is not less than 1 kilolitre (1000 litres); and

(iii)

plumbed to at least a water closet or a water heater or all laundry cold water outlets.

(b)

Where the roof catchment area of the building is less than 50 m2, all the surface water run-off from the roof catchment area must be collected, stored and plumbed in accordance with (a)(i), (a)(ii) and (a)(iii).

Explanatory information

Explanatory Information:

Clause SA 2.2.2 requires the rainwater tank to be plumbed to a water closet, water heater or all laundry cold water outlets. The Office of the Technical Regulator regulates plumbing work in South Australia under the Water Industry Act 2012, including the plumbing of the rainwater tank to the water closet, water heater or laundry cold water outlets. Stormwater connections, including from the roof to the rainwater tank, and from rainwater tank overflow, are regulated by the local council or relevant authority under the Development Act 1993.

SA 2.2.3 Rainwater tank overflow

The rainwater tank must be fitted with an overflow device that disposes of overflow from the rainwater tank in accordance with:

(a)

any specific requirements of the relevant authority; and

(b)

Part 3.1.2 of the Building Code of Australia.


SA 2.2.4 Rainwater tank water quality

The inlet and overflow of the rainwater tank must be fitted with mosquito proof, non-degradable screens.

Explanatory information

Explanatory Information:

Clause SA 2.2.4 requires the fitting of mosquito proof, non-degradable screens to the rainwater tank. The quality of the water stored in the rainwater tank should be managed in NCC 2016 Building Code of Australia - Volume Two accordance with the Department of Health publication 'Guidance on the use of rainwater tanks'.


SA 2.2.5 Rainwater tank stands

Where a rainwater tank is supported on a stand or other structure, the supporting structure must comply with Clause 3.11.2.