| Term | Definition |
|---|
| Flood | longer term flooding over several days due to rainfall over an extended time period show melt or ice jams |
| Five hundred year flood | an area has a 0.2% chance (1 in 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 large ocean wave caused by an under water earthquake or volcanic eruption. |
| Trough | The lowest point between waves. |
| Surge | a surge wave or billow |
| Fjord | a narrow inlet of the sea between cliffs or steep slopes. |
| Crest | the top a wave. |
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