NCC 2025 Volume One F1D3 (Class 2 to 9); Volume Two H2D2(1)(a) (Class 1 and 10) · AS/NZS 3500.3:2025 Section 5, by the Appendix J network method
Under NCC 2025, site stormwater drainage is designed to AS/NZS 3500.3 (Volume One F1D3 for Class 2 to 9 buildings, Volume Two H2D2(1)(a) for houses and Class 10 buildings), and this calculator checks every pipe in a network by that Standard's Appendix J method.