Jake of the Web

The first video is by Park Ranger Kelly Brownson, and catches the beginnings of a faster-moving flood as it goes by him on a bridge. Very fast and very powerful, this flood damaged or destroyed 6 homes not far from the bridge where he filmed.
The second are from David Rankin, also of southern Utah, who has captured flash flood footage of several flash floods. Getting to see so many in one clip kind of gives you a 'cross-section' of flash floods. His shadow occasionally falls on the passing flood debris, which inadvertently gives some perspective to just how big these floods are. Most of these videos find him standing in a dry riverbed with the flood approaching, and he steps aside at the last moment.