| Title |
A Study on the Evaluation for Water Quality Indices |
| Authors |
이인선 ; 이길철 ; 신상철 ; 정동일 ; 최훈근 ( I . S . Lee ; K . C . Lee ; S . C . Shin ; D . I . Jung ; H . K . Choi ) |
| Abstract |
This study was carried out to grope for Water Quality Index (WQI) which is able to use as a practical method evaluating water quality concerned with degree of pollution. 8 variables for determining the pollution were selected such as pH, DOs, Water temperature (WT), BOD, SS, TC, NH₃-N and NO₃-N and the results are summarized as follow. 1. Each WQI value was calculated by exponential equations (graph) described below. At the range. of pH 3.0 to 6.8, Y=10^((0.08394 x pH + 0.74921)) and pH 8.5 to 11.7, Y=10^((-0.21843 x pH + 3.85664)) At the range of DOs 30 to 100%, Y=10^((0.00999 x DOs + 1.00147 )) and DOs 100 to 130%, Y= 10^((-0.02330 x DOs +4.32990)) At the range of WT 28 to 34℃, Y=10^((-0.11650 x WT + 5.26186)) At the range of BOD 0.8 to 10.0 ㎎/ℓ, Y=10^((-0.075975 x BOD + 2.06078)) At the range of SS 2.6 to 37 ㎎/ℓ, Y=l0^((-0.018891 x SS + 2.056673)) At the range of TC 50 to 200,000 MPN/100㎖, Y=10^((-0.19416 x log TC + 2.33007)) At the range of NH₃-N+NO₃-N 0.4 to 3.4㎎/ℓ, Y=10^((-0.23299 x (NH₃-N + NO₃-N) + 2.09320)), Where Y is index value of each water quality. 2. The weights of each variable were 0.04 for pH and WT, 0.11 for DOs, 0.18 for TC, 0.21 for BOD, SS and NH₃-N+NO₃-N, respectively. |