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|Title:||Strategic Stormwater Infrastructure Planning for Future Growth in Regional Townships by Kelsey Mundt|
|Publisher:||Institute of Public Works Engineering Australasia Queensland|
|Abstract:||An increasingly difficult challenge being faced by councils as the urban footprint of our regional townships continue to expand is determining an effective strategy for stormwater infrastructure planning and delivery. Stormwater quantity and quality management is essential in order to ensure the natural values of our creek and river systems are not adversely impacted due to increases in stormwater runoff and pollutants. However, some specific issues that are arising from development are potential cumulative impacts of stormwater detention, ineffective stormwater systems and whether major stormwater infrastructure should be classified as “trunk” or site- based infrastructure – which ultimately determines the framework for funding of the infrastructure. Engeny has recently delivered a package of Urban Stormwater Master Plans (USMPs) for Toowoomba Regional Council (TRC) in 2018 that provides a basis to address these issues. The scope of works identified the future stormwater quantity and quality management requirements to facilitate development across the entire TRC LGA. Specifically, 19 separate townships were identified as containing future growth potential and thus were defined by TRC as Priority Infrastructure Areas (PIA), for which USMPs were developed. In order to develop a Strategic Plan for Stormwater Infrastructure (SPSI) for each township, an over-arching guideline was developed that provides a framework to determine the required stormwater infrastructure and ultimately ensures consistency of stormwater infrastructure planning across the LGA. The guideline for the USMPs contained both technical specifications, such as Desired Standards of Service (DSS) and maximum stormwater detention and treatment sizes, as well as broader guiding principles. Regarding stormwater quantity management, detention was determined on a regional scale to avoid cumulative peak flow increases and pipe and channel systems were determined to optimize future developable footprints where formalised drainage was required. In terms of stormwater quality objectives, determination of treatment systems such as bioretention and wetlands were able to be driven both by State Planning Policy (SPP) requirements and Council preference. Identification of stormwater quality systems were also able to be considered on a regional scale, in order to reduce the number of individual systems, thereby reducing the maintenance burden on Council. In total, approximately $130 million of stormwater infrastructure was identified to facilitate future development across the TRC PIA areas in the USMPs project. From here, further work will be required to determine prioritisation for delivery of the infrastructure and determination of applicability for inclusion into the Local Government Infrastructure Plan (LGIP). Ultimately, the USMPs have been able to provide a solid foundation from which TRC and developers can formulate effective stormwater infrastructure delivery, enabling future growth to progress whilst protecting the natural values of creek systems.|
|Appears in Collections:||South West Queensland Branch Conference Gatton 2019: (POWERPOINT SLIDES)|
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