Figure 2

The physical-chemical properties of each water sample. DO: dissolved oxygen. TDS: total dissolved solids. TP: total phosphorus. TN: total nitrogen. CODMn: permanganate index. The value of abscissa showed the location of sample site: 1 - upstream of confluence; 2 - confluence of branch; 3 - downstream of confluence. MR: sample from right sample site was collected on March. AR: sample from right sample site was collected on August. AL: sample from left sample site was collected on August.