Assessment of the water quality parameters of Lapai – Agaie reservoir was conducted from July – December, 2014. The water quality parameters; the physico – chemical parameters studied and analysed include: Dissolved Oxygen (DO2), pH, Alkalinity, Transparency, Electrical conductivity, Total Water Hardness, Temperature, Phosphate – phosphorus and depth. The results revealed that the condition of this reservoir vary in different months, and for sampling stations showed seasonal fluctuations in the water quality parameters. Values of the water quality parameters observed ranged: Dissolved Oxygen (DO2), 1.5 – 2.5mg/l, pH, 4.5 – 7.1, Alkalinity, 14.9 – 19.1mg/l, Transparency, 0.5 – 1.7m, Electrical conductivity, 36.4 – 46.8µs/cm, Total Hardness, 20.1 – 23.5mg/l, Temperature, 20.4 – 26.7°C, Phosphate – phosphorus, 0.3 – 1.7mg/l and Depth 4.5 – 6.4m. There were significant differences in the values of the water quality parameters result obtained between the two mean values recorded during the period of study. The differences may be as a result of the influx or organic waste deposit from surface water run – offs, and fertilizer deposited by man in the advent of farming. The water quality parameters recorded revealed close agreement with the international recommended range and Federal Ministry of Environment (FMENV) standard for domestic and aquaculture usage..
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