Different hydropower components require different flood checks. Intake walls, diversion weir, cofferdam, and powerhouse area do not always use the same return period.
Recommended workflow
- List all components and their hydraulic exposure.
- Assign return period based on consequence, project standard, and client criteria.
- Calculate flood level for each return period using hydraulic model or rating curve.
- Check freeboard and structural safety for governing cases.
- Prepare one summary table showing Q, water level, and adopted design level.
Quick design table
| Item | Check |
|---|---|
| Diversion weir | Usually checked for high return period flood and safe overtopping behavior. |
| Intake platform | Check accessibility and gate operation during flood. |
| Temporary works | Separate construction-stage flood criteria. |
Do not mix construction-stage flood and permanent design flood in the same table without clear labels.