Some physical and chemical properties
of water were determined at the sampling
sites. The temperature, pH, conductivity, total
dissolved solid and salinity were measured
using the multimeter (electrode kit of WTW
Company). Measurement of some chemical
properties of water was done by the method
of Eaton et al. [8]. Dissolved oxygen (DO)
and BOD5 were measured using the azide
modification method. Alkalinity was measured
by phenolpthalein methyl orange indicator
method. Concentrations of nutrients, i.e.
ammonia-nitrogen, nitrate-nitrogen and
soluble reactive phosphorus (SRP) were
determined in the laboratory by nesslerization,
cadmium reduction and ascorbic acid
methods, respectively.