NDLI: Hydrology of part of the Oramiriukwa River basin, southeast of Owerri, Imo State, Nigeria

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Hydrology of part of the Oramiriukwa River basin, southeast of Owerri, Imo State, Nigeria

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Hydrology of part of the Oramiriukwa River basin, southeast of Owerri, Imo State, Nigeria

Content Provider	Springer Nature Link
Author	Ibe Sr, K. Sowa, A.
Copyright Year	2002
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 1.8×10$^{12}$–2.5×10$^{12}$ m$^{3}$/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.La rivière Oramiriukwa traverse les niveaux sableux de la plaine côtière de la formation du Bénin (Miocène à actuel). L'écoulement de base est très élevé, compris entre 79.13–98.56%, du fait d'une excellente interconnexion hydraulique entre la rivière et l'aquifère latéral libre. La recharge est importante et son volume est estimé entre 1.8×10$^{12}$–2.5×10$^{12}$ m$^{3}$/an. Les sables littoraux ont une granulométrie moyenne à grossière et sont moyennement à médiocrement triés, à grains anguleux à sub-anguleux, avec des lentilles d'argiles et de sables argileux à grain fin. Les sables littoraux et les lentilles argileuses constituent des systèmes à imperméables et à aquifères libres à semi-captifs. Le potentiel de recharge de la nappe est élevé. Le ruissellement lié aux précipitations est réduit. Les eaux souterraines et de surface sont plutôt acides, avec des pH compris entre 5.5–6.1 pour les eaux souterraines et 5.8–6.5 pour les eaux de surface, et avec une dureté généralement faible. Les analyses chimiques et les teneurs en sodium montrent que les eaux souterraines et de surface sont potables après modification du pH des eaux de surface. Les eaux conviennent à un usage agricole, en particulier pour l'irrigation et l'alimentation en eau des volailles. Toutefois, il existe une grave pollution due au lessivage de décharges.El río Oramiriukwa está encajado en los estratos de la llanura costera arenosa de la formación Benín, correspondiente al Mioceno reciente. El flujo de base es muy elevado, ya que está comprendido entre el 79.13–98.56%. Esto es debido a la excelente conexión hidráulica entre el río y el acuífero libre adyacente. Los valores de recarga son altos, habiendo sido estimada entre 1.8×10$^{12}$–2.5×10$^{12}$ m$^{3}$/a. Las arenas costeras son de tamaño medio a grueso, moderadamente a poco clasificadas, de tipo angular a subangular, con lentejones de arcilla y de arenas finas arcillosas. Las arenas costeras y los lentejones de arcillas forman sistemas acuíferos y acuitardos de carácter libre a semiconfinado. El potencial de recarga es elevado, con una baja escorrentía. Tanto las aguas superficiales como las subterráneas son bastante ácidas, con pH comprendidos entre 5.8–6.5 para las primeras y entre 5.5–6.1 para las segundas; la dureza es generalmente baja. Los análisis químicos y el porcentaje de sodio indican que las aguas superficiales y subterráneas son prácticamente potables tras corregir el pH de las primeras. Son aguas aptas para usos agrícolas, especialmente para riego y suministro de aves de corral; sin embargo, la contaminación procedente de lixiviados de vertederos es grave.
Starting Page	509
Ending Page	521
Page Count	13
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	10
Issue Number	4
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-06-08
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Hydrology/Water Resources Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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