Water Technology Mapping Floods in the Toowoomba Region

Water Technology Mapping Floods in the Toowoomba Region

Water Technology are currently undertaking flood studies in seven towns in the Toowoomba Regional Council (TRC) area. The studies cover both riverine and overland flow-path flooding. Riverine flooding occurs in creeks and rivers and results from widespread rain and overland flow-path flooding occurs in drains and minor flow paths through towns as a result of intense local rain; typically during summer thunderstorms. The results of the study are a key component of Council’s floodplain and storm water management planning and will be incorporated into Council’s Planning Scheme.

This current study continues the long-standing strong relationship between TRC and Water Technology. In 2009 Water Technology provided the floodplain and storm water management input to the Toowoomba Regional Planning Project. This was a challenging project which produced a new planning scheme in response to the amalgamation of eight smaller councils to form the Toowoomba Regional Council. In 2012 Water Technology undertook a comprehensive review of flood information within TRC. The review provided recommendations for flood studies including where they were required, the type and priority for each study. This review led to the current work.

On a separate project, Water Technology are working with a TRC led team on the preliminary infrastructure design of the Charlton Wellcamp Enterprise Area. This area is a large industrial and commercial precinct between Toowoomba and Oakey. Water Technology is responsible for all aspects of storm water, flooding and waterway management within the precinct. This includes road drainage, detention basin design, bridge hydraulic assessment, flood mapping and management and geomorphologic assessment of waterways. Water Technology is also assisting TRC in the review of storm water and flood management plans undertaken by private developers within the Precinct. Of particular note, Water Technology has been providing advice to TRC on waterway management on vertosol (black earth) soils. These highly erodible alluvial soils are found extensively throughout the TRC region. While being renowned as exceptionally good cropping soils, they present considerable challenges when it comes to buildings and infrastructure.

“Inland Tsunami” Toowoomba 2011.

About The Author

Warwick Bishop
Warwick is a Director of Water Technology and has over 20 years of experience in surface water management. He has led a wide variety of projects covering areas such as flood risk management, water quality, sediment transport, coastal hazard, WSUD and environmental flows. Warwick has an Honours Degree in Civil Engineering from the University of Melbourne and a Masters of Engineering Science Degree from Monash University, investigating the detailed hydraulics of stormwater treatment wetlands. Warwick has experience throughout Australia in both rural and urban contexts. Since 2011 he has provided specialist input to the Flood Intelligence Unit of SES during both catchment and coastal flood emergencies. He is actively involved in Engineers Australia and is the current chair of the Victorian Water Engineering Branch Committee. Warwick has also contributed to the revision of Australian Rainfall and Runoff, with a particular focus on the application of flood models in urban areas.

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