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AS/NZS 3500.3.2:1998

[Available Superseded]

National plumbing and drainage, Part 3.2: Stormwater drainage — Acceptable solutions

Specifies acceptable solutions for roof, surface and subsoil drainage systems, to the point(s) of connection to the external stormwater drainage network.
Published: 05/06/1998
Pages: 156
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Table of contents
Cited references
Content history
Table of contents
Header
About this publication
PREFACE
1 SCOPE AND GENERAL
1.1 SCOPE AND APPLICATION
1.1.1 Scope
1.1.2 Application
1.2 REFERENCED DOCUMENTS
1.3 DEFINITIONS
1.4 NOTATION
1.4.1 Quantity symbols
1.4.2 Flow chart symbols
1.4.3 Gradients
1.5 STORMWATER DRAINAGE INSTALLATION PLANS
1.6 IDENTIFICATION
1.7 PROTECTION OF WORKS
1.7.1 Roof drainage systems
1.7.2 Surface drainage and subsoil drainage systems
1.8 POSITION AND MANNER OF DISCHARGE
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
2.7.1.1 Resin adhesives
2.7.1.2 Sealants
2.7.1.3 Silver brazing alloy
2.7.1.4 Soft solder
2.7.1.5 Solvent cement and priming fluid
2.7.2 Types
2.7.2.1 Bolted gland (BG)
2.7.2.2 Cement mortar (CM)
2.7.2.3 Elastomeric seals (ES)
2.7.2.4 Epoxy resin (ER)
2.7.2.5 Fusion welded (FW)
2.7.2.6 Mechanical coupling (MC)
2.7.2.7 Metal-banded flexible coupling (FC)
2.7.2.8 Silver brazed (SB)
2.7.2.9 Soft soldered (SS)
2.7.2.10 Solvent cement (SC)
2.7.2.11 Threaded (TH)
2.8 VALVES
2.8.1 Gate and globe
2.8.2 Flap
2.8.3 Non-return
2.8.4 Reflux
2.8.5 Sluice
2.8.6 Wedge gate
2.9 CONCRETE AND MORTAR
2.9.1 Cement
2.9.2 Fine aggregate (sand)
2.9.3 Coarse aggregate (metal)
2.9.4 Concrete
2.9.5 Cement mortar
2.9.6 Chemical admixtures
2.9.7 Water for concrete and mortar
2.9.8 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
2.12.5.1 Specification
2.12.5.2 Limitations on use
2.12.6 Geotextiles
2.12.7 Polyethylene sleeving
2.12.8 Precast or prefabricated pits and arresters
2.12.8.1 Concrete
2.12.8.2 Corrugated metal
2.12.8.3 Other materials
2.12.9 Timber
2.13 FILTERS FOR SUBSOIL DRAINS
2.13.1 Filter material
2.13.2 Geotextile filters
2.14 RE-USE
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 ARI
3.3.5 Rainfall intensity
3.3.5.1 Australia
3.3.5.2 New Zealand
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
3.5 EAVES-GUTTER SYSTEMS
3.5.1 General
3.5.2 Design procedure
3.5.3 Overflow measures
3.5.4 Vertical downpipes
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
3.7.2 Design procedure
3.7.3 Hydraulic capacity
3.7.4 Layout
3.7.5 Overflow devices
3.7.5.1 Hydraulic capacity
3.7.5.2 Operation
3.7.6 Downpipes
3.8 SOAKERS
4 ROOF DRAINAGE SYSTEMS—INSTALLATIONS
4.1 SCOPE OF SECTION
4.2 TRANSPORT, HANDLING AND STORAGE
4.2.1 General
4.2.2 Strippable polymer coating
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 dues to chemical incompatibility
4.5 INSTALLATION AND TESTING
4.5.1 Installation
4.5.2 Testing
4.6 INSPECTION AND CLEANING
4.7 ALTERATIONS AND DISCONNECTION
4.8 EAVES GUTTERS
4.9 BOX GUTTERS
4.10 VALLEY GUTTERS
4.11 DOWNPIPES
4.12 OVERFLOW DEVICES OR MEASURES
4.13 JOINTS FOR METAL COMPONENTS
4.13.1 Type of joints
4.13.1.1 Soldered
4.13.1.2 Sealant
4.13.2 Aluminium alloys
4.13.3 Aluminium/zinc alloy-coated steel
4.13.4 Stainless steel
4.13.5 Zinc and zinc-coated steel
4.14 JOINTS FOR PVC COMPONENTS
4.15 JOINTS FOR OTHER COMPONENTS
4.16 SUPPORT SYSTEMS
4.16.1 Types
4.16.2 Requirements
4.16.3 Support systems for eaves gutters
4.16.4 Support systems for box gutters
4.16.5 Support systems for valley gutters
4.16.6 Support systems for downpipes
4.16.6.1 Vertical
4.16.6.2 Graded
5 SURFACE DRAINAGE SYSTEMS—DESIGN
5.1 SCOPE OF SECTION
5.2 DESIGN METHODS
5.2.1 Methods
5.2.2 General requirements
5.2.3 Design rainfall intensity
5.3 LAYOUT
5.3.1 General
5.3.2 Influences on layout
5.3.3 General requirements for layouts
5.3.3.1 Roof areas
5.3.3.2 Other than roof areas
5.3.3.3 Ponding
5.3.3.4 Entry into buildings
5.3.3.5 Containment of harmful substances
5.3.3.6 Inlet and pit locations
5.3.3.7 Sanitary drainage system
5.4 NOMINAL METHOD
5.5 GENERAL METHOD
5.5.1 Basis
5.5.2 ARI
5.5.3 Time of concentration
5.5.4 Rainfall intensity
5.5.5 Run-off coefficients
5.5.6 Catchment area
5.5.7 Determination of design flows
5.5.8 Design of open channels
5.5.9 Design of inlets
5.5.9.1 Sag pits
5.5.9.2 On-grade pits
5.5.10 Design of pipe drains
5.5.10.1 General
5.5.10.2 Design procedure
5.5.11 Design of surcharge outlets
5.5.11.1 General
5.5.11.2 Design procedure
5.5.12 On-site stormwater detention (OSD) system
5.5.13 Concentrated discharges to streets
5.5.14 Major storm checks
5.5.15 Snowfall effects
6 SUBSOIL DRAINAGE SYSTEMS—DESIGN
6.1 SCOPE OF SECTION
6.2 PURPOSE
6.3 TYPES
6.4 LAYOUT
6.4.1 General arrangement
6.4.2 Specifications—Drains
6.4.3 Specifications—Filters
6.5 DESIGN CONSIDERATIONS
6.5.1 Drain dimensions and spacings
6.5.2 Design of conduits
6.5.3 Pipe gradient
7 SURFACE AND SUBSOIL DRAINAGE SYSTEMS—INSTALLATION
7.1 SCOPE OF SECTION
7.2 GENERAL REQUIREMENTS
7.2.1 Products and joints
7.2.2 Erosion and sediment controls
7.2.3 Terminology
7.2.4 Trench width
7.2.5 Over excavation
7.2.6 Cover
7.2.7 Proximity to other services
7.2.8 Shoring and underpinning buildings
7.2.9 Installation near and under buildings
7.2.10 Water-charged ground
7.2.11 Other than stable grounds
7.2.12 Trench fill
7.2.13 Backfilling
7.2.14 Excavation near point of connection
7.3 SITE STORMWATER DRAINS
7.3.1 Corrosive areas
7.3.2 General
7.3.3 Connections to pits and arresters
7.3.4 Minimum diameter
7.3.5 Gradients
7.3.6 Embedment
7.3.6.1 Materials
7.3.6.2 Installation
7.3.7 Cover under buildings
7.3.8 In easements and public places
7.3.8.1 General requirements
7.3.9 Re-use
7.3.10 Disconnection
7.3.11 Testing
7.4 SUBSOIL DRAINS
7.4.1 General
7.4.2 Embedment
7.4.2.1 Materials
7.4.2.2 Installation
7.4.3 Disconnection
8 SURFACE AND SUBSOIL DRAINAGE SYSTEMS—ANCILLARIES
8.1 SCOPE OF SECTION
8.2 PAVED SURFACES
8.3 POINT(S) OF CONNECTION
8.4 REFLUX VALVES
8.4.1 Purpose
8.4.2 Location
8.4.3 Requirements
8.5 INSPECTION OPENINGS
8.5.1 Location
8.5.2 Size
8.5.3 Access
8.5.4 Plugs or caps
8.6 STORMWATER PITS, INLET PITS AND ARRESTERS
8.6.1 Purpose
8.6.1.1 Stormwater pits
8.6.1.2 Inlet pits
8.6.1.3 Arresters
8.6.2 Size
8.6.2.1 Stormwater and inlet pits
8.6.2.2 Arresters
8.6.3 Falls across pits
8.6.4 Inlets
8.6.5 Materials and construction
8.6.5.1 Rectangular or square pits and arresters
8.6.5.2 Circular pits
8.6.5.3 Conduits and channels
8.6.5.4 Ladders
8.6.5.5 Cement rendering
8.6.5.6 Upper walls of stormwater pits
8.6.5.7 Access openings
8.6.5.8 Construction joints
8.6.5.9 Inserts
8.6.5.10 Connections
8.7 SURCHARGE OUTLETS
8.8 JUNCTIONS
8.8.1 General
8.8.2 Square junctions
8.9 JUMP-UPS
8.10 ANCHOR BLOCKS
8.11 ON-SITE STORMWATER DETENTION (OSD) SYSTEMS
8.11.1 General requirements
8.11.2 Above-ground systems
8.11.3 Below ground systems
8.11.4 Materials
9 PUMPED SYSTEMS
9.1 SCOPE OF SECTION
9.2 GENERAL
9.3 WET WELLS
9.3.1 General
9.3.2 Construction and materials
9.3.3 Base
9.3.4 Cover
9.3.5 Ladders
9.3.6 Combined effective storage
9.3.7 Alarm
9.3.8 Inlet
9.3.9 Sealing
9.4 PUMPS
9.5 RISING MAINS
9.6 ELECTRICAL CONNECTION
10 TESTING
10.1 SCOPE OF SECTION
10.2 DOWNPIPES AND DRAINS WITHIN OR UNDER BUILDINGS
10.3 TEST CRITERIA
10.3.1 Downpipes within buildings
10.3.2 Site stormwater drains and main-internal drains
10.3.3 Rising mains
10.4 PROCEDURE
10.4.1 Water test
10.4.2 Air test
APPENDIX A
AI REFERENCED DOCUMENTS
A2 RELATED DOCUMENTS
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
E3 FIVE MINUTES DURATION RAINFALL INTENSITIES
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 Calculation
H2.3 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
K2.2.3 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
Cited references in this standard
Content history
[Available Superseded]
[Available Superseded]
[Available Superseded]
[Superseded]
DR 96171