Grandchester Railway crossing is inundated with floodwaters in 2011.
Grandchester Railway crossing is inundated with floodwaters in 2011. Contributed

New flood mapping study of Grandchester and Calvert

A NEW flood mapping study of Western Creek catchment in the Grandchester and Calvert area would lead to the increased accuracy of historical flood mapping information for residents and landowners.

Looking at debris levels, photos, anecdotal evidence and eyewitness reports, the study highlighted inconsistencies in recorded flood levels and was commissioned to give a single source of accurate information.

Division 10 councillor David Pahlke said the project collated information gathered in the study for use by developers and homeowners in conjunction with flood maps and give more certainty to those living in the catchment.

"Each flood can be different. We are beefing up our mapping so that the flood information available has a lot more rigour and credibility," Cr Pahlke said.

"Western Creek catchment covers an area of 260 square kilometres and included the townships of Grandchester and Calvert.

"Any mapping inconsistencies will now be corrected and the results of this new study will be included in council's online flood map information.

He said first-hand information of local residents and landowners had been critical to improving the accuracy of historical flood information.

City Management and Finance Committee chairman Victor Attwood said the mapping had been commissioned to improve the understanding of flooding within the catchment.

"A study of flooding behaviour in this area was last conducted in 2002," Cr Attwood said.

"The 2014 study makes use of the latest technology, modelling tools and better terrain information.

"This new study also investigated overland flow paths and provides the most up to date information, and includes recent floods.

"The objectives of the study have been met and now allows council to better inform future planning and infrastructure decisions."



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