Table 1. The elapsed year after construction of erosion control dams in administrative regions.
| Administrativeregion | Total | Elapsed year after construction(Year of construction) |
| 21(’98) | 22(’97) | 23(’96) | 24(’95) | 25(’94) | 26(’93) | 27(’92) | 28(’91) | 29(’90) | 30(’89) | 31(’88) | 32(’87) | 33(’86) |
| Total | 54 | 7 | 15 | 4 | 4 | 6 | 1 | 5 | 4 | 2 | 1 | 1 | 2 | 2 |
| Andong | 5 | 1 | 1 | | | 2 | | | | | | | | 1 |
| Bonghwa | 1 | | 1 | | | | | | | | | | | |
| Cheongdo | 2 | | | | | | | | 2 | | | | | |
| Cheongsong | 4 | 2 | 1 | | 1 | | | | | | | | | |
| Chilgok | 2 | | 1 | | | 1 | | | | | | | | |
| Gimcheon | 3 | 1 | 2 | | | | | | | | | | | |
| Gumi | 1 | | 1 | | | | | | | | | | | |
| Gyeongju | 12 | | 1 | 2 | 1 | 1 | 1 | 3 | 1 | | 1 | | 1 | |
| Gyeongsan | 3 | 1 | 1 | 1 | | | | | | | | | | |
| Mungyeong | 2 | 1 | 1 | | | | | | | | | | | |
| Pohang | 5 | | | | | | | 1 | 1 | 1 | | | 1 | 1 |
| Sangju | 2 | | | 1 | | 1 | | | | | | | | |
| Uiseong | 3 | 1 | 1 | | | | | 1 | | | | | | |
| Uljin | 1 | | | | 1 | | | | | | | | | |
| Yeongcheon | 3 | | 2 | | | | | | | 1 | | | | |
| Yeongdeok | 1 | | 1 | | | | | | | | | | | |
| Yeongju | 1 | | 1 | | | | | | | | | | | |
| Yeongyang | 3 | | | | 1 | 1 | | | | | | 1 | | |