Water Efficiency

GHD was commissioned by the Australian Government to develop a code of practice for non-urban water meters as part of Australian Technical Standard ATS 4747 – Meters for Non-Urban Water Supply.

Development of the code was based on a meteorological assurance system to define how in-service compliance requirements fit within the overall metering lifecycle and legislative requirements.

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GHD was engaged to undertake an energy and water efficiency audit of the AAC.

The main aims of the study was to provide analysis of AAC energy and water consumption and recommendations to assist in reducing operating costs, reducing greenhouse gas emissions and energy and water usage as well as determining the size and operating parameters of a cogeneration system. We also provided recommendations with respect to future major plant upgrades.

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Water metering scoping study.

The objective was to identify the general framework around which new metering policies could be developed and existing policies revised. The study provided a foundation for the future development of Ipswich Water’s Metering Policy Manual. In turn, this manual will provide guidance for the subsequent development of procedures, technical specifications and organisational practices associated with metering. The following areas were addressed by GHD:

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The project involved the establishing the procedures required to undertake accuracy calibrations as well as identify associated criteria required to develop a Quality System for the ongoing calibration and testing of large meters. Criteria for establishing the various procedures, methods, personnel, equipment and engineering infrastructure will be identified in context of the following:

• Management requirements (A synopsis of the management requirements was provided); and
• Technical requirements (Sources of uncertainty in an in situ calibration system were identified).

These criteria will be identified within the context of AS/ISO 17025 (2005) and associated metrological requirements of the National Association of Testing Authorities (NATA) and the National Measurement Institute (NMI) of Australia.

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Client: Melbourne Water
Date: September 2011
Challenge: GHD Undertook an audit of large (e.g. up to 3,000 Megalitres per day) of open channel and closed conduit meters within the Wastewater Treatment Plant to improve understanding of flow measurement across the site, to quantify the accuracy of flow measurement and the influence this is having on distribution of wastewater volumes within the plant.

Description

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GHD to undertook a high-level metering scoping study to establish key issues relating to bulk, network and customer meters. The process involved the preparation of a questionnaire, conducting interviews and identification of meter related issues. The study provided an initial step in a metering audit process with an ultimate purpose of providing input into YVW’s Metering Strategy.

The largest number of meters relating to the customer meter fleet consists of sizes less than 50 mm diameter with approximately 50% of the 600,000 meters being older than 12 years.

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GHD was appointed to undertake a peer review of the program to determine if the current activities will reverse the rapid rise in the level of Non-revenue Water (unaccounted-for-water) and to identify what was required to achieve Metrowater’s (New Zealand) NRW targets.

The review process was guided by an overall audit process, data pathway analysis that examined the data from its capture through to its application in forecasting future NRW levels. The analysis of migratory nature of losses within the equilibrium equation of the water balance requires identified the cause and effect of the various errors associated with measuring and/or determining the different volumetric components. This process facilitated the determination and quantification of the various components of real and apparent losses.

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Natural Resources Environment and The Arts (NRETA, Northern Territory) wanted to encourage more efficient water use through a licensing and water allocation planning process. The process is dependant on reliable and comprehensive water use information. Metering guidelines were developed to suit the quality control needs of licensed water users and resource managers.

A scheme for metering of private rural water use in the Daly and Darwin Rural regions was started. A pilot phase would identify 300 sites where meters were to be installed.

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GHD was commissioned to undertake water use audits of 50 council sites for Greater Shepparton City Council (GSCC).

Data was collected via site investigations, review of existing documents, billing information indicating water usage and relevant GSCC representatives under each water use category.

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Toowoomba City dams reached critically low levels due to the drought in Queensland. GHD was commissioned to identify and minimise system losses in the city’s network through pressure management and leakage detection.

The project included the preparation of preliminary designs for two pilot district metered areas (DMA). The ultimate purpose of the DMAs was to facilitate the development and implementation of a focused strategy to demonstrate water saving targets could be achieved. GHD developed an innovative technique to identify those areas in the whole network that would benefit most from pressure reduction.

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GHD was tasked with developing an innovative wastewater flow monitoring Code of Practice (CoP) for the utility regulator in a country in the Gulf Cooperation Council in the Middle East. The challenge demanded an approach that understood the management of assets throughout their whole life cycle and considered the full data chain of the flow monitoring. The client required that GHD would both advise and instruct throughout the project.

During the project, an Abu Dhabi sector review of wastewater metering was undertaken to ensure all wastewater licensees fulfilled their statutory obligations, were behaving consistently and that all metering data produced was accurate and reliable. The scope of the development was then investigated, with the proposed content, context, key components the overall format of the code all considered.

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Client:
Regulation and Supervision Bureau for the Water, Waste Water and Electricity Sector - Emirate of Abu Dhabi

Date
May to September 2011

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