International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 6, June 2017

International Journal of Science and Technology

Impact Assessment of Human Activities and Seasonal Variation on River Benue, within Makurdi Metropolis

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Author B.A. Anhwange, E. B. Agbaji, E.C Gimba
On Pages 248-254
Volume No. 2
Issue No. 5
Issue Date May, 2012
Publishing Date May, 2012
Keywords River, Pollution, season, runoff, Makurdi and water quality


The physico-chemical properties of river Benue water were assessed during wet and dry seasons, to ascertain the impact of human activities on the water quality. Temperature, colour, turbidity, total suspended solids (TSS), total dissolved solid (TDS), electrical conductivity, pH, hardness, dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), nitrates, phosphates and total coliforms were determined. The result of temperature was found to range between 26-32 oC during the two seasons. Colour, turbidity, TDS, SS and pH were found to be between 106.10-147(PtCo colour), 18.18-24.29 (FTU), 17.19-38.78(mgL-1), 12.55-49.57 (mgL-1), and 6.76-6.81(mgL-1), respectively, during the wet season. While during dry season, 4.0-402.20(PtCo colour), 1.60-319.20 (FTU),, 10.40, - 42.40(mgL-1), 4.80, -347.60(mgL-1) and 8.27- 8.68(mgL-1) were observed for colour, turbidity, TDS, SS and pH respectively. The lowest value of hardness (40.20mgL-1 CaCO3) was recorded during wet season and the highest was 47.20mgL-1 CaCO3. Higher values of hardness 60.20-180.00 mgL-1 CaCO3 were observed during dry season. DO, BOD and COD were found to range between 4.20-5.22(mgL-1), 66.40-81.44(mgL-1) and 91.60-128.93(mgL-1) respectively during wet season, while 4.74-6.00(mgL-1), 49.80-158.40(mgL-1) and , 113.20-316.00(mgL-1) was recorded during dry season. Similarly, 21.42-35.92(mgL-1), 0.92-1.10(mgL-1) and 57.60-1680 cfu/100mL was observed as the mean values for nitrates, phosphates and total coliforms during the wet season and 37.87-46.85(mgL-1), 0.44-2.32(mgL-1) and 26.00-1584.00 cfu/100mL recorded for nitrates, phosphates and total coliforms in the dry season. The result of the study revealed that although, the river was polluted at some points the human activities had not been sternly impacted on the river.

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