Choghakhor water quality assessment using WQS index

This study was carried out to assess Choghahor water quality using WQS index. Sampling was done at 10 stations (3 repetitions) with the frequency of every 45 days from May to March 2010. Dissolved oxygen (DO), TN (nitrate, nitrite and ammonium), TP, NH3, pH, TDS and BOD5 were evaluated. The results of analyses of variance showed that differences were significant (P<0.01) for all parameters in whole stages. According to DO, TP, NH3 and pH, WQS were placed in grade 5 showing good water quality. But to TN it was in grade 3 and 1 indicating poor and bad quality, respectively. Finally, BOD5 was placed in grade 1 showing bad water quality. Using WQS, high similarities have been seen between water qualities in various stations. Total value was found 3.96 for the whole studied area indicating poor water quality.