African Journal of Environmental Science and Technology
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Article Number - 184B4E761971


Vol.11(1), pp. 56-70 , January 2017
DOI: 10.5897/AJEST2016.2086
ISSN: 1996-0786



Full Length Research Paper

Effect of discharges from re-channeled rivers and municipal runoff on water quality of Opa reservoir, Ile-Ife, Southwest Nigeria



Taiwo Adekanmi Adesakin
  • Taiwo Adekanmi Adesakin
  • Department of Zoology, Obafemi Awolowo University, Ile-Ife, Nigeria.
  • Google Scholar
Adebukola Adenike Adedeji*
  • Adebukola Adenike Adedeji*
  • Department of Zoology, Obafemi Awolowo University, Ile-Ife, Nigeria.
  • Google Scholar
Adedeji Idowu Aduwo
  • Adedeji Idowu Aduwo
  • Department of Zoology, Obafemi Awolowo University, Ile-Ife, Nigeria.
  • Google Scholar
Yetunde Folasade Taiwo
  • Yetunde Folasade Taiwo
  • Natural History Museum, Obafemi Awolowo University, Ile-Ife, Nigeria.
  • Google Scholar







 Received: 19 February 2016  Accepted: 09 September 2016  Published: 31 January 2017

Copyright © 2017 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


Over the years, there is a direct linkage of township drains and streams to the Opa reservoir, Obafemi Awolowo University, Nigeria. Hence the spatial and temporal variations of the reservoir’s water quality were studied between November 2012 and October 2013 to investigate the effect of these discharges on these.  Physical, chemical as well as the oxygen parameters of the water were investigated using standard techniques. The parameters determined revealed considerable temporal variations with the rainy season averaged concentration of COD, TOC, OM, TSS, TS, turbidity, apparent colour, true colour, sodium, and phosphate significantly higher (p<0.05) than those of the dry season. Spatially, DO, TSS, TS, organic matter and TOC decreased significantly (p<0.05) from riverine to the lacustrine (dam site). However, calcium, sulphate, and electrical conductivity showed significant increases (p<0.05) from the riverine zone section towards the dam site. Vertically, sulphate, bicarbonate, COD, TOC, chloride, TSS, TS, turbidity, apparent colour, true colour and sodium ion values increased significantly (p<0.05) from the surface down to the bottom. Conversely, magnesium, total hardness, nitrate, BOD, DO, electrical conductivity, acidity, carbonate, alkalinity, TDS and pH values decreased (p<0.05) from water surface to the bottom of the reservoir. Therefore, the discharges from the catchment area of Opa reservoir could pose a level of risk to the aquatic ecosystem as well as the community if not well treated before being supplied.

Key words: Spatial, temporal, water quality, zones, risk level, source.

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APA Adesakin, T. A., Adedeji, A. A., Aduwo, A. I., & Taiwo, Y. F. (2017). Effect of discharges from re-channeled rivers and municipal runoff on water quality of Opa reservoir, Ile-Ife, Southwest Nigeria. African Journal of Environmental Science and Technology , 11(1), 56-70.
Chicago Taiwo Adekanmi Adesakin, Adebukola Adenike Adedeji, Adedeji Idowu Aduwo and Yetunde Folasade Taiwo. "Effect of discharges from re-channeled rivers and municipal runoff on water quality of Opa reservoir, Ile-Ife, Southwest Nigeria." African Journal of Environmental Science and Technology 11, no. 1 (2017): 56-70.
MLA Taiwo Adekanmi Adesakin, et al. "Effect of discharges from re-channeled rivers and municipal runoff on water quality of Opa reservoir, Ile-Ife, Southwest Nigeria." African Journal of Environmental Science and Technology 11.1 (2017): 56-70.
   
DOI 10.5897/AJEST2016.2086
URL http://academicjournals.org/journal/AJEST/article-abstract/184B4E761971

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