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AS/NZS 3500.3:2018

[Available Superseded]

Plumbing and drainage, Part 3: Stormwater drainage

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AS NZS 3500.3 2018 sets out requirements for materials, design, installation and testing of roof drainage systems, surface drainage systems and subsoil drainage systems to a point of connection. Also known as Australian standards stormwater.
Published: 29/06/2018
Pages: 192
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Table of contents
Cited references
Content history
Table of contents
About this publication
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 Definitions
1.5 Abbreviations
1.5.1 General
1.5.2 Plastics
1.6 Notation
1.6.1 Quantity symbols
1.6.2 Flow chart symbols
1.6.3 Gradients
1.7 Identification
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 General Sealants Silver brazing alloy Soft solder Solvent cement and priming fluid
2.7.2 Types Bolted gland (BG) Cement mortar (CM) Elastomeric seals (ES) Epoxy resin (ER) Fusion welded (FW) Mechanical coupling (MC) Metal-banded flexible coupling (FC) Silver brazed (SB) Soft soldered (SS) Solvent cement (SC)
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 Concrete Corrugated metal Other materials
2.12.9 Timber
2.13 Filters for subsoil drains
2.13.1 Filter material
2.13.2 Geotextile filters
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 Australia New Zealand
3.4 Catchment area
3.4.1 General
3.4.2 Three-dimensional representation
3.4.3 Roof Flat roof Single sloping roof Two adjacent sloping roofs
3.4.4 Vertical wall(s) and roof Vertical wall with a flat roof Vertical wall with a sloping roof Vertical walls at right angles to each other
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 Hydraulic capacity Operation
3.7.8 Downpipes
3.8 Balcony and terrace areas
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 Soldered Sealant Laps
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 Vertical Graded
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
5.3.1 General criteria for layouts Roof areas Other than roof areas Ponding Entry into buildings Containment of harmful substances Inlet and pit locations Sanitary drainage system
5.4 General method
5.4.1 General
5.4.2 Overland flood path
5.4.3 Average recurrence interval (ARI)
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 Sag pits On-grade pits
5.4.11 Design of pipe drains General Design procedure
5.4.12 Design of surcharge outlets General Design procedure
5.5 Nominal method
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 Site stormwater drains Site stormwater pipes
6.3.2 Connections to pits and arresters
6.3.3 Minimum diameter
6.3.4 Gradients
6.3.5 Embedment Materials Installation
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 Materials Installation Disconnection
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 Stormwater pits Inlet pits Arresters
7.5.2 Size Stormwater and inlet pits Arresters
7.5.3 Falls across pits
7.5.4 Inlets
7.5.5 Materials and construction Rectangular or square pits and arresters Circular pits Conduits and channels Ladders Cement rendering Upper walls of stormwater pits Access openings Construction joints Inserts Connections
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 (OSD) Systems
7.10.1 General criteria
7.10.2 Below ground systems
7.10.3 Materials
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
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
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
Appendix B
Appendix C
C1 Scope
C2 Roof plan
C2.1 Building with fewer than four floor levels
C2.2 Buildings with four or more floor levels
C3 Site plan
C4 Catchment plan
C5 Computation sheets
Appendix D
D1 Scope
D2 Procedures
D2.1 Australia
D2.2 New Zealand
Appendix E
E1 Scope
E2 Selected place references
Appendix F
F1 Scope
F2 10 minutes duration rainfall intensities
Appendix G
G1 Scope
G2 Full length (continuous) overflows
G3 Specifically located overflows
Appendix H
H1 Scope
H2 Example
H2.1 Problem
H2.2 Case 1—Sloping eaves gutter
H2.2.1 Calculation
H2.2.2 Solution
H2.3 Case 2—Flat eaves gutter
H2.3.1 Calculation
H2.3.2 Solution
Appendix I
Appendix J
J1 Scope
J2 Example 1: Box gutters, rainheads and downpipe
J2.1 Problem
J2.2 Calculation
J3 Example 2: Box gutters, sump/side overflow devices and downpipes
J3.1 Problem
J3.2 Calculation
J4 Example 3: Box gutters, sump/high-capacity overflow devices and downpipes
J4.1 Problem
J4.2 Calculation
Appendix K
K1 Scope
K2 Example 1: Nominal method
K2.1 Problem
K2.2 Solution
K2.2.1 Layout
K2.2.2 Site stormwater drains
K2.3 Stormwater pits
K3 Example 2: General method—Villa home development
K3.1 Problem
K3.2 Assumptions
K3.3 Solution
K3.3.1 Preliminary
K3.3.2 Procedure
K4 Example 3: General method—Warehouse
K4.1 Problem
K4.2 Assumptions
K4.3 Solution
K4.3.1 Preliminary
K4.3.2 Procedures
Appendix L
Appendix M
M1 Scope
M2 Purpose
M3 Types
M4 Layout
M4.1 General arrangement
M4.2 Drains
M4.3 Specifications—Filters
M5 Design considerations
M5.1 Drain dimensions and spacings
M5.2 Design of conduits
M5.3 Pipe gradient
Appendix N
N1 Scope
N2 Protection of works
N2.1 Roof drainage systems
N2.2 Surface water drainage and subsoil drainage systems
N3 Discharge point criteria
N3.1 Position and manner of discharge
N3.2 Stormwater drainage plans
N4 Transport, handling and storage
N5 Inspection and cleaning
N6 Alterations and disconnection
N7 Layout
N7.1 General
N7.2 Influences on layout
N8 Surface water drainage systems—Design
N8.1 Concentrated discharges to streets
N8.2 Snowfall effects
N9 Subsoil drainage systems—Design
N10 Erosion and sediment controls
N11 Other than stable grounds
N12 Above-ground systems
Appendix O
O1 General
O2 General design procedure for siphonic roof drainage systems
O2.1 Design procedure
O2.2 Design parameters
O2.2.1 Basis for calculations
O2.2.2 Gutter/inlet/pipe sizing
O2.2.3 Priming
O2.2.4 Sloping gutters
O2.2.5 Low flow conditions
O2.2.6 Siphonic roof inlet positions
O2.2.7 Downpipes
O2.3 Components
O2.3.1 Inlets
O2.3.2 Access points for cleaning
O2.3.3 Pipe/fittings
O2.3.4 Reducers or expanders
O2.4 Validation of design—Outline checks
O2.5 Installation
O2.5.1 Blockage prevention
O2.5.2 Reducers or expanders
O2.5.3 Fixings and support
O2.5.4 Changes during construction
O2.6 Testing and commissioning
O2.6.1 Inspection
O2.6.2 Hydrostatic/air test
O2.6.3 Condition of system on commissioning
O2.7 Maintenance, inspection and cleaning
O2.7.1 Frequency
O2.7.2 Documentation
Cited references in this standard
PVC pipes and fittings for pressure applications
PVC-U pipes and fittings for stormwater and surface water applications
PVC-U pipes and fittings for drain, waste and vent applications
Installation of PVC pipe systems
Welding of aluminium structures
Content history
[Available Superseded]
[Available Superseded]
[Available Superseded]
DR AS/NZS 3500.3:2017