Table 1. Physical characteristics and hydrological environments at the study stations in the surveyed stations, Korea, 2022
| St. | River width (m) | Water width (m) | Water depth (㎝) | Bottom structure (%)* | Water temperature (℃) | Conductivity (μs/cm) | DO (mg/cm) | pH |
| B | C | P | G | S | M |
| 1 | 10～15 | 1～2 | 10～30 | 40 | 20 | 30 | 10 | | | 20.1 | 58 | 9.8 | 7.4 |
| 2 | 15～20 | 5～7 | 10～20 | 30 | 20 | 20 | 20 | | | 22.6 | 90 | 9.2 | 7.8 |
| 3 | 8～10 | 1.5～2 | 10～20 | | 10 | 40 | 30 | 20 | | 26.0 | 143 | 8.1 | 7.7 |
| 4 | 70～100 | 30～40 | 10～50 | 30 | 30 | 20 | 10 | 10 | | 26.6 | 253 | 8.0 | 7.8 |
| 5 | 40～50 | 3～5 | 10～40 | 20 | 30 | 30 | 20 | | | 24.4 | 139 | 8.4 | 7.7 |
| 6 | 40～50 | 3～4 | 10～20 | | 10 | 10 | 30 | 50 | | 24.1 | 295 | 8.5 | 7.6 |
| 7 | 50～60 | 2～5 | 10～20 | 10 | 10 | 20 | 20 | 40 | | 25.4 | 236 | 8.1 | 7.4 |
| 8 | 30～40 | 4～6 | 10～30 | 20 | 30 | 30 | 20 | | | 23.4 | 148 | 9.2 | 7.8 |
| 9 | 70～80 | 1～2 | 10～30 | | 10 | 30 | 40 | 20 | | 25.5 | 194 | 8.2 | 7.5 |
B: Boulder (>256mm), C: Cobble (64～256mm), P: Pebble (16～64mm), G: Gravel (2～16mm), S: Sand (0.1～2mm), M: Mud (<0.1mm) - modified Cummins (1962).