Yes parts of Bellbowrie have been flooded, but in total only a small portion, with the larger part being unaffected. You can go to the Brisbane Flood Maps to look specifically where the flood affected houses are on a map, and if purchasing the realestate agent will be able to advise you of this too.
Here is a link to the Brisbane City Council Flood Wise website that Yasmar referred to: https://www.brisbane.qld.gov.au/community-safety/community-safety/disasters-emergencies/be-prepared/flooding-brisbane
I'm a local Real Estate Agent so please let me know If I can help you out with anything else :)
0439 979 095