As the US begins to recover and rebuild after Hurricane Katrina distrayed great parts of New Orleans, the second hurricane in less than a month is heading its way. The hurricane passed Florida on Tuesday 20th and now thousands in Texas and western Louisiana are being told to evacuate as the catagory 5 hurricane is on its way.

Hurricane catagories

Hydrological cycle

The hydrological cycle is a closed system. No water enters or leaves the system, it only moves around and changes state.

The University of Illinois - Department of atmospherical sciences web site has information on many of the processes in the hydrological cycle.

Drainage Basin

A drainage basin is an area around a river, any water that falls within this area will end up in that rivers system.

Physical Geography. net explains the drainage basin system and drainage basin patterns.

On 25th August 2005 hruuicane Katrina hit the south coast of Florida, 3 days later it hit New Orleans. The BBC has an animation of the path of Katrina.

Also on the BBC webiste is an animated guide to hurricanes which demonstrates how a hurricane is formed and the possible effects.

A day by day list of the events of hurricane Katrina.

Another more detailed timeline with pictures can be found on the BBC website.