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Domestic Definition of Flash Flood
| Time | Provenance | Definition |
| 1956 | Shanxi Hydrographic Bureau | Flash flood often occurs in mountainous areas where have steep terrain and concentrated rainfall. It characterized with short duration and terrifying force. |
| 1991 | “Discussion on mountain flood disaster prevention measures” | Flash flood isa kind ofsudden and destructive natural disaster. The flood is short in duration, fierce in attack, small in scope, abundant in opportunities, severe in disaster, great in harm and sometimes devastating. |
| 1996 | “A preliminary study on the overall characteristics and hazard regionalization of mountain flood disaster system in China” | Flash flood is an integrated system formed by the interaction between water and sand in mountain system and human social activity subsystem. |
| 2001 | “On mountain flood prevention and control” | The active geomorphic condition combined with the concentrated heavy rainfall cause the flashflood. |
| 2006 | “National Plan for Flash Flood Disaster Prevention and Control” | Flashflood is asudden, explosive and violent surface runoff caused by rainfall in small mountainous watershed. Flash flood disaster is the disasters caused by mountainousfloods, that often combined with debris flow and landslide, and leads casualties and damageson national economy. |
| 2012 | China Meteorological Administration | Flashflood is rapid and powerful surface runoff phenomena occurring in streams in mountainous areas,especially the short lastingsurface runoff occurring in gullies with a mountainous small watershed or in barren streams with periodic flow. |
| 2014 | “Basic Hydrological Terminology and Compliance Standards” | Flash flood is the flood in mountainous areas with short duration and large peak discharge. |
| 2018 | “Technical Specifications for Flash Flood Disaster Investigation and Evaluation” | Flash floodis the river flood caused by rainfall in the mountainous region. Flash flood disaster is the disaster caused by the flood of streams and rivers in mountainous areas and the debris flow and landslide, which cause loss of people's life and property. |