The gorge was formed by flash flood waters that forced their way through the cracks in the basalt lava layers. On average the water flow is around 110 m3/s. But when these floods happen it can go up to 2000 m3/s, this means that it can fill almost 50 Olympic pools in one minute or about one every second. The floods were so intense that they could fill up the gorge, which is an impressive 32 meters tall, up to the top.