| Discount rate (%) | Cost (106 USD) | Benefit (106 USD) | Net benefit (106 USD) | Remarks | |
|---|---|---|---|---|---|
| - Total area of the Ganghwa tidal flat: 35,300 ha | - Time period: 25 years | ||||
| - Area restored: 3,530 ha (10% of the Ganghwa tidal flat) | - Carbon price: $20 / t CO2 e | ||||
| CWPA establishment & management | 2 | 68.5 | 302.0 | 233.5 | - Annual monitoring cost included |
| 4.5 | 52.1 | 244.7 | 192.6 | ||
| 7 | 41.0 | 203.8 | 162.8 | ||
| Coastal wetland restoration | 2 | 19.4 | 11.0 | –8.4 | |
| 4.5 | 8.4 | –11.0 | |||
| 7 | 6.6 | –12.8 | |||
| Total | 2 | 87.9 | 313.0 | 225.1 | |
| 4.5 | 71.5 | 253.1 | 181.6 | ||
| 7 | 60.4 | 210.4 | 150.0 | ||