Launceston's Cataract Gorge when in flood brings people out with their video cameras and below here are some that have been uploaded TO YOUTUBE. The Cataract Gorge floods after heavy rain and typically after 2 t 3 days. These videos shows the First Basin area - normally a tranquil spot with green lawn and a swimming pool - all completely submerged in swirling floodwater. If the Gorge is flooding a visit to watch the power of the water is a LonnieMUSTdo!