Hydrologic Event Codes
| Hyd Event Cd | Hyd Event Nm |
|---|---|
| 1 | Drought |
| 2 | Spill |
| 3 | Regulated flow |
| 4 | Snowmelt |
| 5 | Earthquake |
| 6 | Hurricane |
| 7 | Flood |
| 8 | Volcanic action |
| 9 | Routine sample |
| A | Spring breakup |
| B | Under ice cover |
| C | Glacial lake outbreak |
| D | Mudflow |
| E | Tidal action |
| F | Affected by fire |
| H | Dambreak |
| J | Storm |
| K | Backwater |
| L | Algal bloom |
| X | Not applicable |
| Z | Not Determined (historical) |
