1.1 Icon Water Limited
Icon Water Limited is an agency responsible for the control, ownership and operation of water supply and sewerage systems within the ACT.
The key objectives underlying Icon Water's design policy are as follows:
- to provide the most economic structure/asset to meet the service provision needs as evaluated over a whole life cycle;
- to achieve the most sustainable use of resources entrusted to the care of Icon Water;
- to optimise asset life.
- To provide efficient and effective water storage, treatment and distribution facilities for the urban areas in the ACT, thus creating a safe, potable and reliable supply of water to all customers;
- To at all times provide water to customers except as permitted under the Consumer Protection Code (made under the Utilities Act 2000) or during events or conditions beyond the control of Icon Water;
- To provide water of the quality specified in the Water Supply and Sewerage Service Standards Code and the Drinking Water Quality Code of Practice 2000 (each made under the Utilities Act 2000) to all relevant points of the water supply network;
- To make available the quantity of water specified in the Water Supply and Sewerage Service Standards Code (made under the Utilities Act 2000) through the water supply network;
- To be able to achieve system reliability and availability as defined in the Water Supply and Sewerage Service Standards Code; and
- To be able to meet the fire-fighting requirements agreed with the ACT Fire Brigade.
- To provide efficient and effective sewage collection and disposal facilities for domestic and industrial water borne wastes, so as to achieve public health protection, a pleasant environment and water quality protection;
- To facilitate the ability of the sewage treatment plant to treat sewage;
- To minimise the production of odours which may emanate from the sewerage network;
- To minimise the accumulation of solids and gases in the sewerage network;
- To minimise overflows in the sewerage network and to minimise these overflows into customers premises;
- To achieve sewerage network reliability and availability as defined in the Water Supply and Sewerage Standards Code (made under the Utilities Act 2000); and
- To enhance potential for the re-use of treated effluent.
This document sets out standards for the design of water supply and sewerage reticulation systems to meet the above objectives, and is applicable to the design of new development and redevelopment areas, with emphasis on works to be handled by designers or consultants (on behalf of developers). The practices should not be interpreted as relieving designers of the responsibility to properly assess all conditions, and shall not be interpreted as relieving the use of professional judgement and sound practices required in developing economic proposals.
It is expected that the durability of materials used shall be no less than 100 years for civil works and pipes, and 15 to 25 years for electrical and mechanical equipment.
This document sets out the intent to be achieved and standards that normally achieve the intent. The approval of Icon Water is required where a particular design encompasses the intent but is best resolved by not utilising a standard.
Appropriate detailed specification clauses are to be found in the ACT Public Works Basic Specification (Reference 9.1) as printed by Totalcare Industries Ltd. Specification will need to be approved by Icon Water prior to use.
The Water Supply Section (Part 2) covers the design and detailing of individual water supply reticulation systems downstream of service reservoirs. It provides a brief general background on design aspects but does not cover the planning and design of dams, treatment plants, pump stations, reservoirs or bulk supply mains. The detail design of these latter elements requires a detailed knowledge of the system, and a specialised and specific design approach based on the state of technical knowledge at the time the particular facility is required. Such design would normally be based on a Water Supply Functional Brief.
The Sewerage Section (Part 3) covers the design and detailing of sewage collection systems to be provided in urban residential, commercial and industrial areas, and provides some general requirements on the design of small sewage pump stations. It does not cover sewage treatment facilities or specialised structures (refer Part 3, Technical Requirements for Sewerage, Clause 5.3).
Practices herein should not be automatically adopted for small semi-rural developments on the periphery of the urban area. Provision of a city-standard water supply or sewerage system in such areas may be unjustifiably costly, and standards should be adopted to suit the particular situation.
WSAA (Water Services Association of Australia) as part of its National Code Initiative is developing codes for design, construction, maintenance and rehabilitation of the industry"s water and sewerage infrastructure.
1.3 National guidelines and standards
WSAA"s new Sewerage and Water Reticulation Codes of Australia, published in July 1999 and January 2000 respectively, provide technical guidelines for planners, designers and constructors servicing the land development industry or undertaking contract work on behalf of the water companies. Whilst adopting many performance requirements, the first editions essentially provide a deemed-to-comply solution to the planning, design and construction, and rely on additional information from local water agencies. These codes were prepared by a working party comprising representatives from all the Major Water Authorities, including Icon Water Corporation, based on the individual Authorities" Standards.
Water Supply and Sewerage Standards (AWSSS)
as contained in this release have been reviewed with the aim of national standardisation with the WSAA Codes. It is Icon Water's intention to adopt these Codes within 2 years, with the next release of our Standards containing exceptions to the WSAA National Codes only.
The AWSSS contains a number of references to third party technical documents and Australian Standards. These documents deal in detail with materials, manufacturing, testing and installation. Design agents will need to maintain access to the latest edition of these references.
In general the term "should" is used in reference to design practices, where it is expected that design engineers would exercise professional judgement in deciding instances where they may wish to depart from the standard practice parameters. Designers would be expected to be able to justify such departures in terms of cost savings and improved engineering performance.
The term "shall" is used in reference to standardised designs or methods that will not normally be departed from, and then only after specific approval has been obtained from Icon Water for a particular case.
The term "approval" shall be interpreted as "acceptance". All approvals given are subject to technical compliance with this document unless otherwise noted by Icon Water.
A definition of terms used throughout the various parts of this document can be referenced in Appendix A of the Asset Creation Approval Processes section.