Pollution Research Paper

CORRELATION OF WATER DISCHARGE WITH WATER QUALITY PARAMETERS USING SEM IN SEPANJANG BRIDGE MONITORING STATION AND GUNUNGSARI DAM OF SURABAYA RIVER, INDONESIA

JENIUS SETIO INSANNO, MOHAMMAD RAZIF, SAMSUDIN AFFANDI, MOCHAMAD JUNAIDI HIDAYAT, SATRIA FADIL PERSADA AND PRAWIRA FAJARINDRA BELGIAWAN

Abstract

The purpose of this research is to examine the effect of river water discharge on water quality parameters of the Surabaya River at the monitoring station of the Sepanjang Bridge and Gunungsari Dam at the upstream intake of Ngagel Drinking Water Treatment Plant (IPAM). The parameters included DO, BOD, COD, TSS, PO4, NO3, and were measured using Structural Equation Modeling (SEM) software. Based on the descriptive analysis of the Surabaya River water quality in 2013-2017, it showed that the average concentration of BOD, COD, DO, TSS, PO4 parameters exceeded the water quality standard, while for NO3 the average value was still below the water quality standard. The analysis used by SEM showed that water discharge had a positive effect on DO and TSS parameters. If there is an increase in discharge with one standard deviation, the DO and TSS values will increase. Whereas the effect of water discharge on the parameters BOD, COD, PO4, and NO3 showed the opposite effect.If there is an increase in discharge with one standard deviation, the values of BOD, COD, PO4, NO3 will decrease.