The definition of ?İyidere and Çiftekavak? stream water quality saprobic index and physicochemical variables

The investigation was carried out on the streams of Çiftekavak and İyidere in Rize between April 2010 and March 2011. Water samples were taken monthly from the station which chosen 6 sample points on Iyidere and 2 sample point on Çiftekavak stream. Water quailty was evaluated according to the physicochemical analaysis and benthic macroinvertebrates were analysed and compared with the measurement of parameter. In this study, while inland water quality standards were used in evaluation of the physicochemical water quality, seven different biotic index such as SI (Saprobi Index), FBI (Family Biotik Index), BMWP (Biological Monitoring Index Scores), BBI (Belgium Biotic Index), ASPT (Medium Taxon Index) and EPT taxon number were used in evaluation according to benthic macroinvertabrates. During the period of this study, 27 taxas which belong to Ephemeroptera, Amphipoda, Tricladida, Coleoptera, Decapoda, Rhynchobdellida, Odonata, Diptera, Trichoptera, Plecoptera, Tubificida and Arthropoda were identified. The Ephemeroptera taxa was the highest abundance values in benthic macroinvertebrates. In order to determine the water quality at 8 station along the Rize part of Çiftekavak and İyidere streams. Both the biological and physicochemical data were in good agreement with respect to the water quality and values were correlated. According to evaluation of the water quality of both the biological and physicochemical results, İyidere stream were unpolluted, but Çiftekavak stream were found to be under the threat of more pollution.