K (1)
Among them,
i0
ij
ij
C C
P when it is the dissolved oxygen,
ij
i
ij
CC
P 0
In the formula, K j ——the share ratio of i units pollution out of j sections’ total pollutions;
Pj ——the omnibus index of j sections’ water contamination;
Pij ——the pullulated indicator of i units pollution in j section;
Cij ——the average value of i units pollution in j section;
Ci0 ——the V standard value of i units pollutions in GB3838-2002;
n ——the units of pollutions which involved in the evaluation.