AS 3500 3 1 1998 national plumbing and drainage stormwater

Title

AS 3500.3.1-1998 National plumbing and drainage - Stormwater drainage Performance requirements

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AS 3500.3.1—1998

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Australian Standard™
National plumbing and drainage
Part 3.1: Stormwater drainage—
Performance requirements


This Australian Standard was prepared by Committee WS/20, Stormwater. It was
approved on behalf of the Council of Standards Australia on 11 August 1998 and
published on 5 November 1998.

The following interests are represented on Committee WS/20:
Association of Consulting Engineers, Australia
Association of Hydraulic Services Consultants, Australia
Australian Aluminium Council
Australian Chamber of Commerce and Industry
Australian Chamber of Manufactures
Australian Institute of Loss Adjusters
Bureau of Meteorology (Australia)
Department of Land and Water Conservation, N.S.W.

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Department of Local Government and Planning, Qld
Local Government Office, Tas.
Master Builders Australia
Master Plumbers and Mechanical Services Association of Australia
Master Plumbers Australia
Metal Building Products Manufacturers Association (Australia)
New Zealand Local Government Association
New Zealand Manufacturers Federation
New Zealand Water and Wastes Association
Plastics and Chemical Industries Association (Australia)
Plastics Institute of New Zealand
Plumbing Industry Board, Victoria
University of Technology, Sydney
Department of Administrative Services — Australia

Review of Australian Standards. To keep abreast of progress in industry, Australian Standards are
subject to periodic review and are kept up to date by the issue of amendments or new editions as
necessary. It is important therefore that Standards users ensure that they are in possession of the latest

edition, and any amendments thereto.
Full details of all Australian Standards and related publications will be found in the Standards Australia
Catalogue of Publications; this information is supplemented each month by the magazine ‘The
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new editions and amendments, and of withdrawn Standards.
Suggestions for improvements to Australian Standards, addressed to the head office of Standards
Australia, are welcomed. Notification of any inaccuracy or ambiguity found in an Australian Standard
should be made without delay in order that the matter may be investigated and appropriate action taken.

This Standard was issued in draft form for comment as DR 96170.


AS 3500.3.1—1998

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

Australian Standard™
National plumbing and drainage
Part 3.1: Stormwater drainage—
Performance requirements

Originated in part as part of AS CS3 — 1931.
Previous editions AS 2180 — 1986 and AS 3500.3 — 1990.
AS 2180 — 1986 and AS 3500.3 — 1990 revised, amalgamated
and redesignated in part as AS 3500.3.1 — 1998.

Published by Standards Australia
(Standards Association of Australia)
1 The Crescent, Homebush, NSW 2140
ISBN 0 7337 1983 X

AS 3500.3.1 — 1998

2

PREFACE
This Standard was prepared by the Joint Standards Australia / Standards New Zealand
Committee WS/20, Stormwater, to supersede (in part) AS 2180 — 1986, Metal rainwater
goods — Selection and installation, and AS 3500, National Plumbing and Drainage Code,
Part 3 — 1990: Stormwater drainage which will be withdrawn 5 June 1999.
This Standard is the result of a consensus among Australian and New Zealand
representatives on the committee to produce it as an Australian Standard.
This Standard is part of a series as follows:
AS 3500

National plumbing and drainage

3500.3.1

Part 3.1: Stormwater drainage — Performance requirements (this Standard)

3500.3.2

Part 3.2: Stormwater drainage — Acceptable solutions

Stormwater drainage — Methods for verification (Part 3.3) is in the course of preparation.

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The performance-based format was chosen to foster innovation and facilitate the
introduction of new technologies.
This Standard specifies performance requirements that must be met in order for a
stormwater drainage system to provide the expected level of protection for people and
property from adverse effects of stormwater.
Part 3.2 specifies acceptable solutions that are deemed to satisfy Part 3.1 and the Building
Codes of Australia and New Zealand, for materials and products, and design and
installation of stormwater drainage systems.
Part 3.3 will specify methods for verification that are deemed to satisfy Part 3.1, for the
design and testing of stormwater drainage systems. Such methods are not exclusive.
This arrangement provides the flexibility for a design to utilize new technology where
appropriate, while providing certainty for those wishing to use a set of ‘proven’
requirements.

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3

AS 3500.3.1 — 1998

CONTENTS
Page

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1
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SCOPE . . . . . . . . . . . . . . . . . . . .
REFERENCED DOCUMENTS . . . .
DEFINITIONS . . . . . . . . . . . . . . .
OBJECTIVE . . . . . . . . . . . . . . . . .
FUNCTIONAL REQUIREMENT . .
PERFORMANCE REQUIREMENTS
DEEMED TO SATISFY . . . . . . . .

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AS 3500.3.1 — 1998

4

STANDARDS AUSTRALIA
Australian Standard
National plumbing and drainage
Part 3.1: Stormwater drainage — Performance requirements
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.
2 REFERENCED DOCUMENTS
Standard:

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AS/NZS
3500
3500.0
3500.3.2

The following documents are referred to in this

National plumbing and drainage
Part 0:
Glossary of terms
Part 3.2: Stormwater drainage —Acceptable solutions

3 DEFINITIONS For the purpose of this Standard, the definitions given in
AS/NZS 3500.0 and AS/NZS 3500.3.2 apply.
4

OBJECTIVE

The objective of this Standard is to —

(a)

minimize risks of injury or inconvenience to people and damage to property caused

by stormwater;

(b)

protect stormwater drainage systems of a property, and the external stormwater
drainage network, from damage; and

(c)

ensure that stormwater drainage systems will satisfy the requirements of Items (a)
and (b) throughout their design lifetime.

5 FUNCTIONAL REQUIREMENT All components of a stormwater drainage system
for a property shall provide protection against the adverse effects of stormwater flows.
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.

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.
6.1.3

Watertightness

All internal roof drainage system components shall be watertight.
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5

6.2

AS 3500.3.1 — 1998

Surface drainage systems

6.2.1 Minor storm performance Surface drainage systems shall be designed to dispose
of stormwater flows from rainfall events having an ARI appropriate to the importance of
the site and the severity of potential damage and injury that would result from the failure
of such systems.

6.2.2 Major storm performance Surface drainage systems and overflow paths, in
combination, shall be designed for rainfall events having an ARI of 50 years or greater.
Adverse effects of stormwater flows shall not present a hazard to people or cause
significant damage to property.
6.3 Subsoil drainage systems Subsoil drainage systems for the removal of excess
groundwater and the reduction of soil moisture levels shall be designed —
(a)

so as not to cause damage to buildings and other facilities by changing soil moisture
conditions; and

(b)

with advice from a suitably qualified competent person having expertise in assessing
soil and groundwater behaviour.

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6.4 Position and manner of discharge The position and manner of discharge of the
stormwater drainage system shall be to the satisfaction of the appropriate authority.
6.5

Stormwater drainage systems

Stormwater drainage systems shall —

(a)

convey stormwater to a point of connection using gravity flow where possible;

(b)

avoid the likelihood of blockages;

(c)

avoid the likelihood of leakage and penetration by roots;

(d)

provide access for maintenance and clearing blockages;

(e)

avoid damage to the external stormwater drainage network where the stormwater is
being discharged to such a network;

(f)

avoid the likelihood of damage from superimposed loads on normal ground, or
building movements;

(g)

prevent the entry of sewage, trade waste or both;

(h)

prevent the entry of stormwater to a sanitary drainage system; and

(i)

avoid the likelihood of damage to buildings or site works, in particular during the
construction phase.

6.6 No point of connection Where a point of connection to a stormwater drainage
network is not available, the stormwater drainage system shall be designed and installed
to—
(a)

prevent the concentration of stormwater onto adjacent properties; and

(b)

prevent stormwater from entering a building.

7 DEEMED TO SATISFY The following are deemed to satisfy the performance
requirements specified in Clause 6:
(a)

Acceptable solutions as specified in AS/NZS 3500.3.2.

(b)

Verification by design and analytical methods, supplemented, where required, by
laboratory testing.

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