AS/NZS 3500.3:2021
Plumbing and drainage, Part 3: Stormwater drainage
Standard sets out the requirements for materials, design, installation and testing of roof drainage systems, surface drainage systems and subsoil drainage systems to a point of connection KEYWORDS: Plumbing; Drainage; Stormwater; Roof, surface and subsoil drainage
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AS/NZS 3500.3:2021 Plumbing and drainage Stormwater drainage
Preface
Section 1 Scope and general
1.1 Scope
1.2 Application
1.2.1 Australia
1.2.2 New Zealand
1.3 Normative references
1.4 Terms and definitions
1.5 Abbreviations
1.5.1 General
1.5.2 Plastics abbreviations
1.6 Notation
1.6.1 Quantity symbols
1.6.2 Flow chart symbols
1.6.3 Gradients
1.7 Identification of piping
Section 2 Materials and products
2.1 Scope of section
2.2 Selection and use
2.3 Roof drainage system
2.3.1 Roof drainage system components
2.3.2 Downpipes
2.3.3 Accessories and fasteners
2.4 Stormwater drains (non-pressure)
2.5 Rising mains (pressure)
2.6 Subsoil drains
2.7 Joints
2.7.1 Resin adhesives
2.7.2 Types
2.8 Valves
2.8.1 Gate and globe
2.8.2 Non-return
2.8.3 Sluice
2.8.4 Wedge gate
2.9 Concrete and mortar
2.9.1 Concrete
2.9.2 Cement mortar
2.9.3 Chemical admixtures
2.9.4 Water for concrete and mortar
2.9.5 Steel reinforcement
2.10 Embedment material
2.10.1 Site stormwater drains
2.10.2 Subsoil drains
2.11 Trench fill
2.12 Miscellaneous
2.12.1 Clay building bricks
2.12.2 Concrete masonry units
2.12.3 Cover and sump grates
2.12.4 External protective coating
2.12.5 Fibreglass-reinforced plastic tanks
2.12.6 Geotextiles
2.12.7 Polyethylene sleeving
2.12.8 Precast or prefabricated pits and arresters
2.12.9 Timber
2.13 Filters for subsoil drains
2.13.1 Filter material
2.13.2 Geotextile filters
Section 3 Roof drainage systems — Design
3.1 Scope of section
3.2 General method
3.3 Meteorological criteria
3.3.1 General
3.3.2 Snowfall effects
3.3.3 Wind effects
3.3.4 Design probabilities
3.3.5 Rainfall intensity
3.4 Catchment area
3.4.1 General
3.4.2 Three-dimensional representation
3.4.3 Roof
3.4.4 Vertical wall(s) and roof
3.4.5 Higher catchment area
3.4.6 Green, landscaped or garden roofs
3.5 Eaves gutter systems
3.5.1 General
3.5.2 Design procedure
3.5.3 Vertical downpipes
3.5.4 Effective cross-sectional area of eaves gutters
3.6 Valley gutters
3.6.1 Limitations
3.6.2 Design procedure
3.6.3 Effective width
3.7 Box gutter systems
3.7.1 General
3.7.2 Freeboard
3.7.3 Limitations
3.7.4 Design procedure
3.7.5 Hydraulic capacity
3.7.6 Layout
3.7.7 Overflow devices
3.7.8 Downpipes
3.8 Balcony and terrace areas
Section 4 Roof drainage systems — Installation
4.1 Scope of section
4.2 Installation
4.3 Thermal variation
4.3.1 General
4.3.2 Expansion joints
4.4 Corrosion
4.4.1 Corrosion due to direct contact
4.4.2 Corrosion due to drainage
4.4.3 Corrosion due to crevices
4.4.4 Corrosion due to chemical incompatibility
4.5 Installation and testing
4.5.1 Installation
4.5.2 Testing
4.5.3 Eaves gutters
4.5.4 Box gutters
4.5.5 Valley gutters
4.5.6 Downpipes
4.6 Overflow devices
4.7 Joints for metal components
4.7.1 General
4.7.2 Type of joints
4.7.3 Aluminium alloys
4.7.4 Aluminium/zinc and aluminium/zinc/magnesium alloy-coated steel
4.7.5 Stainless steel
4.7.6 Zinc and zinc-coated steel
4.8 Joints for other components
4.9 Support systems
4.9.1 Types
4.9.2 Criteria
4.9.3 Support systems for eaves gutters
4.9.4 Support systems for box gutters
4.9.5 Support systems for valley gutters
4.9.6 Support systems for downpipes
Section 5 Surface water drainage systems — Design
5.1 Scope of section
5.2 Design
5.2.1 Methods
5.2.2 General criteria
5.2.3 Design rainfall intensity
5.3 Layout — General criteria
5.3.1 Roof areas
5.3.2 Other than roof areas
5.3.3 Ponding
5.3.4 Entry into buildings
5.3.5 Containment of harmful substances
5.3.6 Inlet and pit locations
5.3.7 Sanitary drainage system
5.4 General method
5.4.1 General
5.4.2 Overland flood path
5.4.3 Average exceedance probability
5.4.4 Time of concentration
5.4.5 Rainfall intensity
5.4.6 Run-off coefficients
5.4.7 Catchment area
5.4.8 Determination of design flows
5.4.9 Design of open channels
5.4.10 Design of inlets
5.4.11 Design of pipe drains
5.4.12 Design of surcharge outlets (Australia only)
5.5 Nominal method
Section 6 Surface and subsoil drainage systems — Installation
6.1 Scope of section
6.2 General requirements
6.2.1 Products and joints
6.2.2 Terminology
6.2.3 Trench width
6.2.4 Over-excavation
6.2.5 Cover
6.2.6 Proximity to other services
6.2.7 Shoring and underpinning buildings
6.2.8 Installation near and under buildings
6.2.9 Water-charged ground
6.2.10 Trench fill
6.2.11 Backfilling
6.2.12 Excavation near point of connection
6.2.13 Corrosive areas
6.3 Site stormwater drains
6.3.1 General
6.3.2 Connections to pits and arresters
6.3.3 Minimum diameter
6.3.4 Gradients
6.3.5 Embedment
6.3.6 Cover under buildings
6.3.7 In easements and public places
6.3.8 Disconnection
6.3.9 Testing
6.4 Subsoil drains
6.4.1 General
6.4.2 Embedment
Section 7 Surface water and subsoil drainage systems — Ancillaries
7.1 Scope of section
7.2 Paved surfaces
7.3 Reflux valves
7.3.1 Purpose
7.3.2 Location
7.3.3 Criteria
7.4 Inspection openings
7.4.1 Location
7.4.2 Size
7.4.3 Access
7.4.4 Plugs or caps
7.5 Stormwater pits, inlet pits and arresters
7.5.1 Purpose
7.5.2 Size
7.5.3 Falls across pits
7.5.4 Inlets
7.5.5 Materials and construction
7.6 Surcharge outlets
7.7 Junctions
7.7.1 General
7.7.2 Square junctions
7.8 Jump-ups
7.9 Anchor blocks
7.10 On-site stormwater detention systems
7.10.1 General criteria
7.10.2 Below-ground systems
7.10.3 Materials
Section 8 Pumped systems
8.1 Scope of section
8.2 General requirements
8.3 Wet wells
8.3.1 General
8.3.2 Construction and materials
8.3.3 Base
8.3.4 Cover
8.3.5 Ladders
8.3.6 Combined effective storage
8.3.7 Alarm
8.3.8 Inlet
8.3.9 Sealing
8.4 Pumps
8.5 Rising mains
8.6 Electrical connection
Section 9 Site Testing
9.1 Scope of section
9.2 Downpipes, site stormwater drains and drains within or under buildings
9.3 Test criteria
9.3.1 Downpipes within buildings
9.3.2 Site stormwater drains, drains within and under buildings, and main internal drains
9.3.3 Rising mains
9.4 Procedure
9.4.1 Water test
9.4.2 Air test
Section 10 Siphonic drainage systems
10.1 Scope of section
10.1.1 General
10.1.2 Design probabilities
10.1.3 Design methods
10.1.4 Materials
10.2 Requirements
10.2.1 Freeboard
10.2.2 Balancing
10.2.3 Available head
10.2.4 Calculation of flows at inlets
10.2.5 Minimum pressure in pipes
10.2.6 Minimum velocity
10.2.7 Overflow capacity
10.2.8 Minimum pipe size
Appendix A (informative) Site-mixed concrete for minor works
Appendix B (informative) Stormwater drainage installation plans
Appendix C (informative) Guidelines for determining rainfall intensities
Appendix D (normative) Rainfall intensities for Australia
Appendix E (normative) Rainfall intensities for New Zealand — 10 min duration
Appendix F (informative) Examples of overflow measures for eaves gutters
Appendix G (informative) General method for design of eaves gutter systems — Example
Appendix H (normative) Box gutter systems — General method, design graphs and illustrations
Appendix I (informative) Box gutter systems — General method — Examples
Appendix J (informative) Surface water drainage systems — Nominal and general methods — Examples
Appendix K (informative) Example calculation — Pumped system
Appendix L (informative) Subsoil drainage systems — Design
Appendix M (informative) General information
Appendix N (informative) Operation of siphonic roof drainage systems
Bibliography
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Related Information
Building Code Compliance Document E1
Ministry: Ministry of Business, Innovation, and Employment - Building Systems Performance (BSP)
Section: AS2
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AS/NZS 3500.3:2021 Plumbing and drainage Stormwater drainage
Preface
Section 1 Scope and general
1.1 Scope
1.2 Application
1.2.1 Australia
1.2.2 New Zealand
1.3 Normative references
1.4 Terms and definitions
1.5 Abbreviations
1.5.1 General
1.5.2 Plastics abbreviations
1.6 Notation
1.6.1 Quantity symbols
1.6.2 Flow chart symbols
1.6.3 Gradients
1.7 Identification of piping
Section 2 Materials and products
2.1 Scope of section
2.2 Selection and use
2.3 Roof drainage system
2.3.1 Roof drainage system components
2.3.2 Downpipes
2.3.3 Accessories and fasteners
2.4 Stormwater drains (non-pressure)
2.5 Rising mains (pressure)
2.6 Subsoil drains
2.7 Joints
2.7.1 Resin adhesives
2.7.2 Types
2.8 Valves
2.8.1 Gate and globe
2.8.2 Non-return
2.8.3 Sluice
2.8.4 Wedge gate
2.9 Concrete and mortar
2.9.1 Concrete
2.9.2 Cement mortar
2.9.3 Chemical admixtures
2.9.4 Water for concrete and mortar
2.9.5 Steel reinforcement
2.10 Embedment material
2.10.1 Site stormwater drains
2.10.2 Subsoil drains
2.11 Trench fill
2.12 Miscellaneous
2.12.1 Clay building bricks
2.12.2 Concrete masonry units
2.12.3 Cover and sump grates
2.12.4 External protective coating
2.12.5 Fibreglass-reinforced plastic tanks
2.12.6 Geotextiles
2.12.7 Polyethylene sleeving
2.12.8 Precast or prefabricated pits and arresters
2.12.9 Timber
2.13 Filters for subsoil drains
2.13.1 Filter material
2.13.2 Geotextile filters
Section 3 Roof drainage systems — Design
3.1 Scope of section
3.2 General method
3.3 Meteorological criteria
3.3.1 General
3.3.2 Snowfall effects
3.3.3 Wind effects
3.3.4 Design probabilities
3.3.5 Rainfall intensity
3.4 Catchment area
3.4.1 General
3.4.2 Three-dimensional representation
3.4.3 Roof
3.4.4 Vertical wall(s) and roof
3.4.5 Higher catchment area
3.4.6 Green, landscaped or garden roofs
3.5 Eaves gutter systems
3.5.1 General
3.5.2 Design procedure
3.5.3 Vertical downpipes
3.5.4 Effective cross-sectional area of eaves gutters
3.6 Valley gutters
3.6.1 Limitations
3.6.2 Design procedure
3.6.3 Effective width
3.7 Box gutter systems
3.7.1 General
3.7.2 Freeboard
3.7.3 Limitations
3.7.4 Design procedure
3.7.5 Hydraulic capacity
3.7.6 Layout
3.7.7 Overflow devices
3.7.8 Downpipes
3.8 Balcony and terrace areas
Section 4 Roof drainage systems — Installation
4.1 Scope of section
4.2 Installation
4.3 Thermal variation
4.3.1 General
4.3.2 Expansion joints
4.4 Corrosion
4.4.1 Corrosion due to direct contact
4.4.2 Corrosion due to drainage
4.4.3 Corrosion due to crevices
4.4.4 Corrosion due to chemical incompatibility
4.5 Installation and testing
4.5.1 Installation
4.5.2 Testing
4.5.3 Eaves gutters
4.5.4 Box gutters
4.5.5 Valley gutters
4.5.6 Downpipes
4.6 Overflow devices
4.7 Joints for metal components
4.7.1 General
4.7.2 Type of joints
4.7.3 Aluminium alloys
4.7.4 Aluminium/zinc and aluminium/zinc/magnesium alloy-coated steel
4.7.5 Stainless steel
4.7.6 Zinc and zinc-coated steel
4.8 Joints for other components
4.9 Support systems
4.9.1 Types
4.9.2 Criteria
4.9.3 Support systems for eaves gutters
4.9.4 Support systems for box gutters
4.9.5 Support systems for valley gutters
4.9.6 Support systems for downpipes
Section 5 Surface water drainage systems — Design
5.1 Scope of section
5.2 Design
5.2.1 Methods
5.2.2 General criteria
5.2.3 Design rainfall intensity
5.3 Layout — General criteria
5.3.1 Roof areas
5.3.2 Other than roof areas
5.3.3 Ponding
5.3.4 Entry into buildings
5.3.5 Containment of harmful substances
5.3.6 Inlet and pit locations
5.3.7 Sanitary drainage system
5.4 General method
5.4.1 General
5.4.2 Overland flood path
5.4.3 Average exceedance probability
5.4.4 Time of concentration
5.4.5 Rainfall intensity
5.4.6 Run-off coefficients
5.4.7 Catchment area
5.4.8 Determination of design flows
5.4.9 Design of open channels
5.4.10 Design of inlets
5.4.11 Design of pipe drains
5.4.12 Design of surcharge outlets (Australia only)
5.5 Nominal method
Section 6 Surface and subsoil drainage systems — Installation
6.1 Scope of section
6.2 General requirements
6.2.1 Products and joints
6.2.2 Terminology
6.2.3 Trench width
6.2.4 Over-excavation
6.2.5 Cover
6.2.6 Proximity to other services
6.2.7 Shoring and underpinning buildings
6.2.8 Installation near and under buildings
6.2.9 Water-charged ground
6.2.10 Trench fill
6.2.11 Backfilling
6.2.12 Excavation near point of connection
6.2.13 Corrosive areas
6.3 Site stormwater drains
6.3.1 General
6.3.2 Connections to pits and arresters
6.3.3 Minimum diameter
6.3.4 Gradients
6.3.5 Embedment
6.3.6 Cover under buildings
6.3.7 In easements and public places
6.3.8 Disconnection
6.3.9 Testing
6.4 Subsoil drains
6.4.1 General
6.4.2 Embedment
Section 7 Surface water and subsoil drainage systems — Ancillaries
7.1 Scope of section
7.2 Paved surfaces
7.3 Reflux valves
7.3.1 Purpose
7.3.2 Location
7.3.3 Criteria
7.4 Inspection openings
7.4.1 Location
7.4.2 Size
7.4.3 Access
7.4.4 Plugs or caps
7.5 Stormwater pits, inlet pits and arresters
7.5.1 Purpose
7.5.2 Size
7.5.3 Falls across pits
7.5.4 Inlets
7.5.5 Materials and construction
7.6 Surcharge outlets
7.7 Junctions
7.7.1 General
7.7.2 Square junctions
7.8 Jump-ups
7.9 Anchor blocks
7.10 On-site stormwater detention systems
7.10.1 General criteria
7.10.2 Below-ground systems
7.10.3 Materials
Section 8 Pumped systems
8.1 Scope of section
8.2 General requirements
8.3 Wet wells
8.3.1 General
8.3.2 Construction and materials
8.3.3 Base
8.3.4 Cover
8.3.5 Ladders
8.3.6 Combined effective storage
8.3.7 Alarm
8.3.8 Inlet
8.3.9 Sealing
8.4 Pumps
8.5 Rising mains
8.6 Electrical connection
Section 9 Site Testing
9.1 Scope of section
9.2 Downpipes, site stormwater drains and drains within or under buildings
9.3 Test criteria
9.3.1 Downpipes within buildings
9.3.2 Site stormwater drains, drains within and under buildings, and main internal drains
9.3.3 Rising mains
9.4 Procedure
9.4.1 Water test
9.4.2 Air test
Section 10 Siphonic drainage systems
10.1 Scope of section
10.1.1 General
10.1.2 Design probabilities
10.1.3 Design methods
10.1.4 Materials
10.2 Requirements
10.2.1 Freeboard
10.2.2 Balancing
10.2.3 Available head
10.2.4 Calculation of flows at inlets
10.2.5 Minimum pressure in pipes
10.2.6 Minimum velocity
10.2.7 Overflow capacity
10.2.8 Minimum pipe size
Appendix A (informative) Site-mixed concrete for minor works
Appendix B (informative) Stormwater drainage installation plans
Appendix C (informative) Guidelines for determining rainfall intensities
Appendix D (normative) Rainfall intensities for Australia
Appendix E (normative) Rainfall intensities for New Zealand — 10 min duration
Appendix F (informative) Examples of overflow measures for eaves gutters
Appendix G (informative) General method for design of eaves gutter systems — Example
Appendix H (normative) Box gutter systems — General method, design graphs and illustrations
Appendix I (informative) Box gutter systems — General method — Examples
Appendix J (informative) Surface water drainage systems — Nominal and general methods — Examples
Appendix K (informative) Example calculation — Pumped system
Appendix L (informative) Subsoil drainage systems — Design
Appendix M (informative) General information
Appendix N (informative) Operation of siphonic roof drainage systems
Bibliography
AS/NZS 3500.3:2021
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.