NCC 2025 Volume One F1D3 and F1D4 (Class 2 to 9); Volume Two H2D2(1)(a) (Class 1 and 10) · AS/NZS 3500.3:2025 Clause 3.8, with Figure H.4 for sump outlets
NCC 2025 calls up AS/NZS 3500.3 for this drainage (Volume One F1D3 for Class 2 to 9 buildings, Volume Two H2D2(1)(a) for Class 1 and 10), and Volume One F1D4 adds the fall, step down, hob and overflow level for a concrete roof, balcony or podium of a Class 2 to 9 building.