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Title: Downstream Variation in Water Quality of Orle River, Edo State
Authors: Ikhile, C. I.
Issue Date: 2004
Publisher: Knowledge Review, Onitsha, Anambra State, Nigeria
Series/Report no.: 9(6);9 – 14
Abstract: The downstream variation in water quality of Orle River draining the Northern portion of Edo State, Nigeria was investigated. The aim was to ascertain if there were any observed differences in the quality of the water in the downstream direction of the river from source to mouth under different environmental conditions. The Orle Rive rises from the northern basement complex rock of the state, flows through the cretaceous sedimentary in the middle of the study area where it is joined by Ojo and Ediom Rivers before it enters the Niger River in the Tertiary sedimentary rock formation. This paper has examined some physio-chemical parameters of the river. It was found that some of the parameters vary in the downstream direction. While the source in the basement complex environment resulted in a tendency towards alkalinity in pH, the downstream location in geology change resulted in a rise in the mean water temperature and true colour and the effect of mixing at the confluences, resulted generally in a reduced pH, total solids and true colour. The pattern of variation can be explained by the fact that rivers at high stage are less concentrated than rivers at low stage.
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