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Hydrogeological and hydrochemical character of the regolith aquifer, northern Obudu Plateau, southern Nigeria

Content Provider	Springer Nature Link
Author	Edet, Aniekan Okereke, Chiedu
Copyright Year	2004
Abstract	Photogeological, geoelectrical, and drill-hole data were used to determine the hydrogeological conditions of the regolith layer mantling the Precambrian rocks in the northern Obudu plateau of southern Nigeria. The regolith thickness is 3.8–89.5 m (mean 38 m). Water for domestic purposes is extracted by dug wells <15 m deep and shallow boreholes <50 m. The mean value for permeability of the saturated regolith is 7.5×10$^{−1}$ m/d and for transmissivity, 3.8×10$^{−1}$ m$^{2}$/d. The regolith wells have a high specific capacity, 40–270 m$^{3}$/d/m and a high yield, 700–4,050 m$^{3}$/d. Using statistical analysis, well yields and specific capacities can be estimated if the saturated thickness and apparent resistivity of regolith layers are known from drill-hole data and vertical electrical sounding. Chemical data show that the major groundwater types are calcium-bicarbonate (Ca-HCO$_{3}$) and sodium+potassium bicarbonate [(Na+K)-HCO$_{3}$] and the water quality meets national and international standards for drinking, domestic and agricultural purposes. However, for future proper management of water resources in the area, care should be taken, that waste-disposal sites for both solid and human waste should not be located near waste sources.Des données photogéologiques, géoélectriques et de forage ont été utilisées afin de déterminer les conditions hydrogéologiques de l’aquifère régolithique qui recouvre les roches précambriennes dans le plateau nord d’Obudu au sud du Nigeria. L’épaisseur de régolithe varie entre 3.8 et 89.5 m avec une moyenne de 38 m. L’eau destinée aux usages domestiques est extraite de puits de surface (< 15 m de profondeur) et de puits artésiens (< 50 m). La valeur moyenne de perméabilité du régolithe saturé est de 7.5×10$^{−1}$ m/j et la transmissivité moyenne de 3.8×10$^{−1}$ m$^{2}$/j. Les puits qui exploitent l’aquifère de régolithe ont une capacité spécifique variant entre 40 et 270 m$^{2}$/j/m et un rendement élevé de 700 à 4 500 m$^{3}$/j. Avec l’aide d’une analyse statistique, le rendement et la capacité spécifique des puits peuvent être estimés si l’épaisseur saturée et la résistivité apparente des couches de régolithe sont déterminées avec des forages et des relevés électriques verticaux. Des données sur la composition chimique de l’eau montrent que les types d’eau majeurs sont bicarbonaté-calcique et bicarbonaté sodique + potassique et que la qualité de l’eau rencontre les standards nationaux et internationaux pour l’eau potable, l’utilisation domestique et à fins d’agriculture. Malgré tout, dans l’optique d’une gestion appropriée des ressources en eau dans la région, une attention particulière doit être portée aux sites d’enfouissement des déchets solides et humains qui ne devraient pas être localisés près des sources d’eau.Se utilizaron datos fotogeológicos, geoeléctricas y de barrenación para determinar las condiciones hidrogeológicas de la capa de regolito que cubre rocas precámbricas en la meseta obudu septentrional del sur de Nigeria. El regolito tiene un espesor de 3.8–89.5 m (promedio38m). El agua para uso doméstico se extrae medio de pozos excavados hasta profundidades de 15 metros y por barrenos no muy profundos de 50 metros. La permeabilidad promedio del regolito saturado es 7.5×10$^{−1}$ m/d, con transmisibilidad de 3.8×10$^{−1}$ m$^{2}$/d. Los pozos dentro del regolito tienen alta capacidad específica de 40–270 mm$^{2}$/d/m y un alto rendimiento de 700–4,050 mm$^{3}$/d. Se puede estimar el rendimiento de los pozos y capacidades específicas usando análisis estadístico si el espesor saturado y la resistividad aparente de las capas de regolito se conocen a partir de los datos de barrenación y sondeo geoeléctrico. Los datos químicos muestran que los tipos de aguas subterráneas son principalmente de bicarbonato de calcio (Ca-HCO$_{3}$) y bicarbonato de sodio y potasio [(Na+K)-HCO$_{3}$] y el agua cumple las estándares de calidad nacional y internacional para agua potable y para uso doméstico y agrícola. Sin embargo para el futuro manejo apropriado del recurso de agua en el área es importante que se tenga cuidado de que los sitios de desechos de basura solida y humana no sean ubicados cerca de los fuentes de agua.
Starting Page	391
Ending Page	415
Page Count	25
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	13
Issue Number	2
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-12-17
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electrical resistivity Hydrogeology Hydrochemistry Regolith Obudu plateau Nigeria
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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