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.