Table 1. Physical characteristics and hydrological environments at the study stations in the surveyed stations, Korea, 2020

St.	River width (m)	Water width (m)	Water depth (㎝)	Bottom strusture (%)*						Water temperature (°C)	Conductivity (μs/cm)	DO (mg/cm)	pH
				B	C	P	G	S	M
1	2～3	1～1.5	10～30	30	30	20	20			21.3	108	12.1	6.4
2	15～20	0.5～0.8	10～20		10	20	30	30	10	24.9	138	11.0	7.3
3	5～7	0.5～1.0	10～20			10	30	40	20	26.8	123	10.8	7.3
4	80～100	50～70	10～30	10	20	30	20	10	10	28.4	288	9.6	7.3
5	5～7	1～2	10～20	10	10	20	30	30		23.2	214	11.4	6.8
6	25～30	1～3	10～30		20	30	30	20	10	26.6	422	10.4	7.3
7	70～80	1～1.5	10～30		10	20	20	30	20	28.7	483	10.4	7.2
8	30～40	1～2	10～20	30	30	20	10	10		24.8	154	10.1	8.2
9	20～30	1～2	10～20		10	20	30	30	10	26.3	249	10.1	7.4

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).