Water Journal : Water Journal May 2014
WATER MAY 2014 42 Feature Article At present, there are no standard methods or guidelines for the testing, validation and performance assessment of stormwater treatment devices in Australia. The wider uptake of IWCM and WSUD and growing number of stormwater treatment devices create a need for the consistent and veri able performance database to inform the fair and technically robust assessment and selection processes for treatment of stormwater. As the market for stormwater treatment devices expands, the lack of published data on their performance becomes more apparent (Victorian Stormwater Committee, 1999), while detailed eld monitoring is also very scarce (Wong et al., 2000). The combination of a large number of devices, a lack of reporting protocols and standard methods, and only a small number of detailed monitoring studies has resulted in a large uncertainty in stormwater treatment device selection. Local government, which is largely responsible for the implementation and management of stormwater infrastructure in Australia, is dependent on in-house expertise and manufacturers' advice in selecting appropriate stormwater treatment strategies. Independent discussions with local government, water authorities and stormwater industry professionals have revealed interest in the documentation and development of guidelines and frameworks to assist in the system design, product selection and evaluation to ensure adequate stormwater treatment and management. Development of the protocols on the performance assessment for stormwater treatment devices will greatly assist in the adoption and utilisation of IWCM approach in Australian towns and cities via the: • Increased certainty in the performance of stormwater treatment devices and resultant water quality delivered by IWCM projects; • Consistent and structured approach to the selection of stormwater treatment devices with the direct bene t to the proponents (e.g. councils/developers), designers, asset owners and other stakeholders of a stormwater projects; • Sharing of the legacy of knowledge in stormwater treatment with the industry. In recognition of this industry need, a number of research projects have been commissioned by various organisations with a view to assessing the options available for independent veri cation of stormwater treatment devices in Australia, both at the state and federal level. A PRACTITIONER'S VIEW Practicing in the area of integrated water cycle management and seeing through the delivery of both wastewater and stormwater projects, I have noticed some signi cant differences between those two groups affecting the choice of delivery mechanism, namely: • Stricter and more defned regulations in the wastewater market including treatment standards, roles and responsibilities of various stakeholders, approval processes etc; • Wider adoption of the Design and Construct and Design, Built and Operate contract types as a wastewater project delivery mechanism, generally with the Performance Guarantee provided by the Contractor; • Established practice of performance validation and veri cation in the wastewater market. Given the current interest in the uptake of SWH and the ongoing commitment to control and treat runoff before its discharge into the natural environment -- by application of WSUD -- the Australian stormwater market is likely to grow. The pace at which the stormwater market in Australia grows will, to a large degree, depend on the certainty that it can offer to the public, clients and governments in delivering stated objectives. This requires, among other things, a clear path on how to achieve the stated objectives (i.e. stormwater harvesting guidelines) and the means to verify that it actually works (i.e. validation and veri cation protocols). Figure 3. Stormwater harvesting guidelines -- detailed topics.
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