Data collected in the Ikpoba reservoir showed that most of the factors considered followed a seasonal pattern and could be assigned to three categories: (a) Wet season maximum as a consequence of increased precipitation with concomitant increase in surface run-off input, (conductivity, phosphate, pH, alkalinity, total iron, sulphate nitrate, phosphate, silicate; (b) Dry season maximum arising from low precipitation coupled with surface run-off reduction, as well the evaporation of the reservoir water (chloride, sodium, calcium, potassium and dissolved oxygen); (
