A lot of water in a little time proved to be extremely catastrophic at Canyon Lake of Central Texas in the summer of 2002. Due to record spring rainfall, the water was diverted around the dam forming a massive canyon.
This flow carved through solid bedrock resulting in a two mile-long canyon up to 20 feet deep, as well as tumbling many enormous boulders. Sediment to fill a thousand football stadiums was almost instantaneously displaced to downstream locations. All this happened within a three-day period!
This tiny geologic event was a drop in a swimming pool compared to the type of world-wide erosion happening all over our planet during Noah’s flood. Our entire planet was resurfaced by flood flows a million times more powerful and widespread than the Canyon Lake release.
(Source: Inspired Evidence- Canyon Carved in just 3 days in Texas flood: Insight into ancient floods and Mars, Science Daily 7/10/10)