The Brisbane floods of 2011 were the result of continuous rain which fell heavily throughout early January. Rain outside of Brisbane had the most impact.
On 10 January 2011, Toowoomba, a city which sits at an elevation of 700m at the top of the Great Dividing Range, received 150 mm of rain within a 40 minute period. The ground could not hold any more water, and the waters from the escarpment at the top of the range rushed in a torrent towards the city. Stormwater drains and creeks coming through the two natural valleys in the city were already overflowing, unable to cope with the sudden torrent of rain. The water from the escarpment at the top of the range then rushed down the mountainside, creating a wall of water, a 7m high inland "tsunami", that went through the city and down the range. This wall of water rushed through Lockyer Valley to the catchment areas of the main dam that protects the city of Brisbane from flooding, sending its capacity to 190%. The gates had to be opened, sending the equivalent of two Sydney Harbour's worth of water into the Brisbane River each day. This is why Brisbane and Ipswich flooded. Subsequent inquiries have pointed the finger at senior engineers acting too late to release water from Wivenhoe.
the last flood was june of 2010
brisbane
1974
floding
September through till March
Springfield, west of Brisbane, will not be affected by the floods that are coming to Brisbane in January 2011.
375 houses got hit by the flood.
Yes. Parts of Bardon did go underwater in Brisbane's 1974 flood. Ithaca Creek overflows caused this.
As of 11 January 2011, most roads from Brisbane Airport to Logan remain open.
The road from Brisbane Airport to Carseldine is not currently blocked by the floods in Brisbane. There may be issues getting through the creeks, but you should be able to travel around low-lying areas.
One problem that exists in Brisbane in 2012 is that parts of the city are still awaiting cleanup and reconstruction after the massive flood that came through a year ago.
There were a number of factors that contributed to the origin of the Brisbane flood. Ultimately, it could be said that the Brisbane flood started at Wivenhoe Dam, largely as a result of a torrent that started further west. On 10 January 2011, Toowoomba, a city which sits at an elevation of 700m at the top of the Great Dividing Range, received 150 mm of rain within a 40 minute period. The ground could not hold any more water, and the waters from the escarpment at the top of the range filled the quarry and rushed down the range. This wall of water rushed through Lockyer Valley to the catchment areas of the main dam that protects the city of Brisbane from flooding, sending its capacity to 190%. The gates had to be opened, sending the equivalent of two Sydney Harbour's worth of water into the Brisbane River each day. It was this release of massive volumes of water in a short period of time which started the flood in Brisbane.