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This document highlights the major updates in the 2025 edition of AS/NZS 3500.3 (Plumbing and Drainage - Stormwater drainage), focusing on critical changes to valley-gutter catchment limits, overflow design procedures, and new compliance requirements for connecting miscellaneous appliances. It serves as an essential regulatory guide from Victoria's Building and Plumbing Commission to help practitioners ensure proper drainage system sizing and protect infrastructure.
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Version history
Category
Guide
Version
1.0
Published
25 November 2025
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