The assessment of physicochemical and biological conditions at five sites in Kasnazan impoundment water were conducted at monthly interval during August 2004 to February 2005, in order to know the degree of deterioration of water quality caused by anthropogenic activities in the area. Depending on statistical analysis water quality changes showed significant differences (P<0.05) in conductivity, pH, PO 4 , SiO 2 and phytoplankton density between site 1 and other studied sites. In addition to a positive relationship between chlorophyll a concentration and phytoplankton density was observed.Generally, principal component analysis (PCA) showed that water quality was impacted by fertilizer and detergents.
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