Hydrology of part of the Oramiriukwa River basin,southeast of Owerri,Imo State,Nigeria |
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Authors: | K Ibe Sr A Sowa |
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Institution: | (1) Federal University of Technology, P.M.B 1526 Owerri, Nigeria,;(2) HPC Harress Pickel Consult GmbH, Klingenhof Str., 51 9041 Nürnberg, Germany, |
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Abstract: | The Oramiriukwa River is within the sandy coastal plain strata of the Benin formation (Miocene–Recent). The base flow is very
high ranging from 79.13–98.56%, which is caused by the excellent hydraulic interconnection between the river and the adjacent
unconfined aquifer. Recharge rates are high, estimated to range from 1.8×1012–2.5×1012 m3/year. Coastal sands are medium-to-coarse grained, moderately-to-poorly sorted, angular to subangular, with lenses of clay
and clayey fine-grained sands. The coastal sands and clay lenses form aquifer and aquitard systems, which are unconfined to
semi-confined. Groundwater recharge potential is high. Runoff from precipitation is low. Groundwater and surface water are
fairly acidic; pH ranges from 5.5–6.1 (groundwater) and 5.8–6.5 (surface water), and hardness is generally low. Chemical analysis
and percentage sodium show that groundwater and surface water are somewhat potable after some pH modification of the surface
water. The waters are good for agricultural use, especially for irrigation and poultry water supply. However, pollution from
landfill leachate is serious.
Electronic Publication |
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Keywords: | Contamination General hydrogeology Groundwater/surface-water relations Hydrochemistry Nigeria |
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