Class

Value

Sediment pollution intensity

1

DC_m < 1.5

Zero degree of contamination to very low level

2

1.5 < DC_m < 2

Low degree of contamination

3

2 < DC_m < 4

Moderate degree of contamination

4

4 < DC_m < 8

High degree of contamination

5

8 < DC_m < 16

Very high degree of contamination

6

16 < DC_m < 32

Extremely high degree of contamination

7

DC_m ≥ 32

Ultra-high degree of contamination