| Term | Definition |
|---|
| Flood | Longer term flooding over several day due to rainfall over an extended time period, snow melt or ice jams. |
| Five Hundrad year flood | AN area has a 0.2% chance (1in 500) of a flood every year. |
| Flash Flood | Short term flooding caused by heavy rainfall in a short time period (usually 6 hours or less) or a dam failure. |
| Flood Watch | Issued when flooding is possible, but not imminent or occurring. |
| Flood Warning | Issued when flooding is imminent or occurring. |
| Tsunami | A very larger ocean wave caused by an underwater earthquake or volcanic erupion. |
| Trough | The lowest point between waves. |
| Surge | A large wave or billow. |
| Fjord | A nsrrow inlet of the sea between cliffs or steep slopes. |
| Crest | The top of a wave. |
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