Flood Records
Flash Flood Records Explained: Extreme Rain, Terrain, Burn Scars, and Fast Water
Why flash flood records happen, how terrain and burn scars amplify runoff, and why rainfall totals do not tell the whole story.
Quick answer: Flash flood records depend on rainfall rate, terrain, soil, drainage, land cover, and how quickly water concentrates in channels.
Rainfall rate
Very high rain rates can overwhelm drainage even if the storm does not last long.
Training storms make the problem worse.
Terrain and soil
Steep slopes, urban pavement, saturated soil, frozen ground, and burn scars can all increase runoff.
A smaller rain total can be dangerous in the wrong place.
Record complexity
Flood depth, flow speed, rainfall total, and damage are different ways to describe a record.
Each tells part of the story.