Complex sentence: Each damage level is associated with flood potential and implied kinetic energy, the Rasmussen scale is a potential damage scale, and the measurements are most of the time applied prior to any damage done to give people a sense of the imminent event.
Split into simpler sentences: Each damage level is associated with flood potential and implied kinetic energy/damage potential. The Rasmussen scale is a potential damage scale, and the measurements are most of the time applied prior to any damage done to give people a sense of the imminent event.