This Supplement covers the design and construction of dual water supply systems for servicing new developments. The Supplement addresses the provision of a non-drinking water supply and its impacts on (drinking) water supply design and construction, which take precedence over the Water Supply Code and which should be read and applied in conjunction with the Water Supply Code of Australia WSA 03 and Water Agency supplementary requirements. Standard Drawings and their Commentaries are also provided to demonstrate particular aspects of dual water supply installation, including the marking and signage required for such systems.

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