| Risk | Size | Spillway Design Flood |
| Low | Small | RI = 50 to 100 years |
| Medium | RI = 100 to ½ PMF | |
| Large | 0.5 to 1 PMF | |
| Medium | Small | RI = 100 years at 0.5 PMF |
| Medium | 0.5 to 1 PMF | |
| Large | 1 PMF | |
| High | Small | 0.5 to 1 PMF |
| Medium | 1 PMF | |
| Large | 1 PMF |