Wivenhoe Dam is presently at about 175% of its water storage (supply) capacity, and about 80% of its total design capacity, which includes flood mitigation. Releases at present are 236,000 megalitres per day, which equates to 2.73ML per second. That means that they are releasing Brisbane's total daily consumption every 30 seconds or so.
With more torrential rain presently falling in the Upper Brisbane Valley, I would think that the Dam will be just about at its absolute limit in a day or so, notwithstanding the current releases.
Anyone in the low-lying parts of Brisbane really ought to be aware of this, and prepared for every eventuality. Lets hope it abates soon.
To see the data on the dams, Google "SEQWater", or visit these links
http://www.seqwater.com.au/public/home
http://www.seqwater.com.au/public/ca...s/wivenhoe-dam