Trend Analysis of Water Quality Parameters of Surma River, Bangladesh

Abstract

This study analyzes trends water quality of the Surma River in Sylhet, Bangladesh focuses to physico-chemical parameters, including temperature, pH, dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), total solids (TS), total dissolved solids (TDS), and suspended solids (SS) during the rainy and winter seasons from 2010 to 2013. The findings revealed that temperature, pH, TS, and TDS of the Surma River exhibited variations within the prescribed standards. However, the average values of BOD, COD, and SS surpassed the established limits, while DO levels were consistently below the permissible threshold. Employing Principal Component Analysis (PCA), 18 significant variables were identified, showing a mix of linear, quadratic, and cubic trends across the seasons. From trend analysis it is found that three variables follow linear trend, five variables follow quadratic trend and ten variables follow cubic trend successively. These insights into the trends of Surma River's physico-chemical parameters contribute to understanding its behavior, aiding in effective monitoring and management strategies.