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S T A N D A R D S S T A N D A R D S

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AS/NZS 3500.3.2:1998 National plumbing and drainage Part 3.2: Stormwater drainage - Acceptable solutions AS 3500.3.1:1998 National plumbing and drainage Part 3.1: Stormwater drainage - Performance requirements AS/NZS 2179.1:1994 Specifications for rainwater goods, accessories and fasteners Part 1: Metal shape or sheet rainwater goods, and metal accessories and fasteners

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1.1 SCOPE This Standard specifies requirements for pre-painted metal, metal and organic film/metal laminated shape or sheet rainwater goods, and metal accessories and fasteners. AS/NZS 2179.1:1994 Specifications for rainwater goods, accessories and fasteners Part 1: Metal shape or sheet rainwater goods, and metal accessories and fasteners 3.8 EFFECTIVE CROSS-SECTIONALAREA The effective cross-sectional area (to the nearest 100 mm²) for each nominal size of eaves gutter, valley gutter and downpipe shall be supplied by the manufacturer. The effective cross-sectional area for each shall be as follows: (a) For an eaves gutter and support system (i) it is the cross-sectional area beneath a line not less than 10 mm below the overflow, e.g. front bead, gutter back or bottom of overflow slots; or 4.1 GENERAL One or more of the performance tests shall be used to demonstrate the compliance of a gutter or downpipe and support system

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1 SCOPE This Standard specifies the performance requirements for materials and products, and design and installation of roof drainage systems, surface drainage systems and subsoil drainage systems. AS 3500.3.1:1998 National plumbing and drainage Part 3.1: Stormwater drainage - Performance requirements

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6 PERFORMANCE REQUIREMENTS 6.1 Roof drainage systems 6.1.1 Average recurrence interval (ARI) Roof drainage systems shall be designed and installed in accordance with the following: (a) Where it is unlikely that adverse effects of stormwater flows would result in significant inconvenience or injury to people or damage to property, for rainfall events having an ARI of not less than 20 years. (b) Where it is likely that adverse effects of stormwater flows would result in significant inconvenience or injury to people or damage to property, for rainfall events having an ARI of not less than 100 years. AS 3500.3.1:1998 National plumbing and drainage Part 3.1: Stormwater drainage - Performance requirements 6.1.2 Overflow devices or measures Overflow devices or measures shall be installed where overtopping of the roof drainage system could cause significant monetary loss, property damage or personal injury, and shall be designed in accordance with Clause 6.1.1(b) taking into account the effect of obstructions and blockages.

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AS/NZS 3500.3.2:1998 National plumbing and drainage Part 3.2: Stormwater drainage - Acceptable solutions Australian/New Zealand Standard TM Building Code of Australia primary referenced Standard

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AS/NZS 3500.3.2:1998 SECTION 3ROOF DRAINAGE SYSTEMS - DESIGN

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TABLE 3.1 AVERAGE RECURRENCE INTERVAL ARI = 20 years ARI = 20 years

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(PART OF) FIGURE E4 AREA 2 - RAINFALL INTENSITIES (mm/h) FOR 5 MINUTES DURATION AND AN ARI OF 20 YEARS (PART OF) FIGURE E4 AREA 2 - RAINFALL INTENSITIES (mm/h) FOR 5 MINUTES DURATION AND AN ARI OF 20 YEARS rainfall intensity = 210 mm/h rainfall intensity = 210 mm/h SYDNEY 210 ARI = 20 years

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15 96 8 4 12 Pitch 23.5° + 6 x 4 = 24 + 6 x 4 = 24 15 x 8 = 120 15 x 8 = 120 (A h ) 144 m² (A h ) 144 m² rainfall intensity = 210 mm/h Pitch 23.5° ARI = 20 years

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23.5 1.21 0 0 5 5 15 20 25 30 35 10 40 45 50 55 1 1 1.1 1.6 1.7 1.5 1.4 1.3 1.2 1.8 1.9 VALUES OF (F) SLOPE OF ROOF GUTTERS (DEGREES) FIGURE 3.4 CATCHMENT AREA - SLOPE FACTOR, F, (FOR EAVES GUTTER ONLY) x 1.2 (F) x 1.2 (F) + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² rainfall intensity = 210 mm/h (A c ) 174 m² (A c ) 174 m² ARI = 20 years

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x 1.2 (F) + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² rainfall intensity = 210 mm/h (A c ) 174 m² Gradient 1 : 500 Gradient 1 : 500 Smoothline A e = 5900 mm² Smoothline A e = 5900 mm² 4.8 EAVES GUTTERS Eaves gutters shall be installed as follows: (a) Gradients Deviations from nominal gradients shall be smooth and not cause permanent ponding. NOTES: 1. Where a building is likely to move due to reactive soils, gradients may need to be not flatter than - (a) 1:250 to achieve an effective gradient not flatter than 1:500; or (b) 1:500 to achieve an effective gradient with no permanent ponding. 10 mm minimum 5900 mm² ARI = 20 years

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x 1.2 (F) + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² rainfall intensity = 210 mm/h (A c ) 174 m² Gradient 1 : 500 Smoothline A e = 5900 mm² 0.68 1.0 2.0 3.0 4.0 5.0 6.0 6.38 3.0 4.0 6.0 7.0 8.0 9.0 10.0 5.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 4.0 5.3 8.0 9.4 10.7 12.0 13.4 6.7 14.7 16.0 17.4 18.7 20.1 21.4 22.7 24.1 0 0 10 60 70 50 40 30 20 80 90 100 EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS OF 1 : 500 AND STEEPER EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS OF 1 : 500 AND STEEPER CATCHMENT AREA PER VERTICAL DOWNPIPE (A c ) m² EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS FLATTER THAN 1 : 500 EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS FLATTER THAN 1 : 500 TOTAL FLOW IN EAVES GUTTER (L / s) DESIGN RAINFALL INTENSITY mm / h FIGURE 3.6 REQUIRED SIZE OF EAVES GUTTERS 50 100 350 400 300 250 200 150 450 500 ARI = 20 years

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rainfall intensity = 210 mm/h + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² x 1.2 (F) Gradient 1 : 500 (A c ) 174 m² Smoothline A e = 5900 mm² A cdp = 28 m² A cdp = 28 m² 174 / 28 = 7 174 / 28 = 7 min number of downpipes min number of downpipes 0.68 1.0 2.0 3.0 4.0 5.0 6.0 6.38 3.0 4.0 6.0 7.0 8.0 9.0 10.0 5.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 4.0 5.3 8.0 9.4 10.7 12.0 13.4 6.7 14.7 16.0 17.4 18.7 20.1 21.4 22.7 24.1 0 0 10 60 70 50 40 30 20 80 90 100 EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS OF 1 : 500 AND STEEPER EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS OF 1 : 500 AND STEEPER CATCHMENT AREA PER VERTICAL DOWNPIPE (A c ) m² EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS FLATTER THAN 1 : 500 EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS FLATTER THAN 1 : 500 TOTAL FLOW IN EAVES GUTTER (L / s) 50 100 350 400 300 250 200 150 450 500 DESIGN RAINFALL INTENSITY mm / h 5.9 28 FIGURE 3.6 REQUIRED SIZE OF EAVES GUTTERS ARI = 20 years

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15 96 8 4 12 Pitch 23.5° HP HP HPHP HP HPHP DP - A DP - B DP - CDP - DDP - E DP - FDP - G 24 m² 28 m² 25 m² + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² rainfall intensity = 210 mm/h x 1.2 (F) Gradient 1 : 500 (A c ) 174 m² Smoothline A e = 5900 mm² A cdp = 28 m² 174 / 28 = 7 min number of downpipes ARI = 20 years

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min downpipe size = 85 dia min downpipe size = 85 dia + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² rainfall intensity = 210 mm/h x 1.2 (F) Gradient 1 : 500 (A c ) 174 m² Smoothline A e = 5900 mm² A cdp = 28 m² 174 / 28 = 7 min number of downpipes TABLE 3.2 EAVES GUTTERREQUIRED SIZE OF VERTICAL DOWNPIPE ARI = 20 years

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15 96 8 4 12 Pitch 23.5° HP DP - A DP - B DP - CDP - DDP - E DP - FDP - G 24 m² 28 m² 25 m² + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² rainfall intensity = 210 mm/h x 1.2 (F) Gradient 1 : 500 (A c ) 174 m² Smoothline A e = 5900 mm² A cdp = 28 m² 174 / 28 = 7 min number of downpipes ARI = 20 years min downpipe size = 85 dia A s-c (downpipe G) = 28 m² A s-c (downpipe G) = 28 m²

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0.68 1.0 2.0 3.0 4.0 5.0 6.0 6.38 3.0 4.0 6.0 7.0 8.0 9.0 10.0 5.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 4.0 5.3 8.0 9.4 10.7 12.0 13.4 6.7 14.7 16.0 17.4 18.7 20.1 21.4 22.7 24.1 0 0 10 60 70 50 40 30 20 80 90 100 EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS OF 1 : 500 AND STEEPER EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS OF 1 : 500 AND STEEPER CATCHMENT AREA PER VERTICAL DOWNPIPE (A c ) m² EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS FLATTER THAN 1 : 500 EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (A e ) 1000 mm² FOR GRADIENTS FLATTER THAN 1 : 500 TOTAL FLOW IN EAVES GUTTER (L / s) 50 100 350 400 300 250 200 150 450 500 DESIGN RAINFALL INTENSITY mm / h FIGURE 3.6 REQUIRED SIZE OF EAVES GUTTERS 28 1.65 total flow = 1.65 L/s total flow = 1.65 L/s A s-c (downpipe G) = 28 m² (A c ) 174 m² + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² rainfall intensity = 210 mm/h x 1.2 (F) Gradient 1 : 500 Smoothline A e = 5900 mm² A cdp = 28 m² 174 / 28 = 7 min number of downpipes ARI = 20 years min downpipe size = 85 dia

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15 96 8 4 12 Pitch 23.5° HP DP - A DP - B DP - CDP - DDP - E DP - FDP - G 24 m² 28 m² 25 m² 1.65 / 4 = 0.4 L / s 1.65 / 4 = 0.4 L / s Ave flow per metre of gutter Ave flow per metre of gutter Length of gutter (G) = 4 m Length of gutter (G) = 4 m 4 4 total flow = 1.65 L/s A s-c (downpipe G) = 28 m² (A c ) 174 m² + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² rainfall intensity = 210 mm/h x 1.2 (F) Gradient 1 : 500 Smoothline A e = 5900 mm² A cdp = 28 m² 174 / 28 = 7 min number of downpipes ARI = 20 years min downpipe size = 85 dia

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hfhf hfhf 10 mm min hfhf 30 mm min flashing TABLE G1 MINIMUM hf VALUES h f = 14 mm h f = 14 mm 1.65 / 4 = 0.4 L / s Ave flow per metre of gutter Length of gutter (G) = 4 m total flow = 1.65 L/s A s-c (downpipe G) = 28 m² (A c ) 174 m² + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² rainfall intensity = 210 mm/h x 1.2 (F) Gradient 1 : 500 Smoothline A e = 5900 mm² A cdp = 28 m² 174 / 28 = 7 min number of downpipes ARI = 20 years min downpipe size = 85 dia

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h f = 14 mm 1.65 / 4 = 0.4 L / s Ave flow per metre of gutter Length of gutter (G) = 4 m total flow = 1.65 L/s A s-c (downpipe G) = 28 m² (A c ) 174 m² + 6 x 4 = 24 15 x 8 = 120 (A h ) 144 m² rainfall intensity = 210 mm/h x 1.2 (F) Gradient 1 : 500 Smoothline A e = 5900 mm² A cdp = 28 m² 174 / 28 = 7 min number of downpipes ARI = 20 years min downpipe size = 85 dia

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C O N C L U S I O N C O N C L U S I O N many years experience in home & industrial building markets huge range of products backed by a national company extensive industry knowledge commitment to customer service Smoothline offers unique features & benefits many years experience in home & industrial building markets huge range of products backed by a national company extensive industry knowledge commitment to customer service Smoothline offers unique features & benefits

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